{"id":399774,"date":"2025-09-03T11:07:36","date_gmt":"2025-09-03T09:07:36","guid":{"rendered":"https:\/\/climatescience.press\/?p=399774"},"modified":"2025-09-03T11:07:38","modified_gmt":"2025-09-03T09:07:38","slug":"surplus-arctic-ice-persists-to-end-of-august-2025","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=399774","title":{"rendered":"Surplus Arctic Ice Persists to End of August\u00a02025"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"723\" data-attachment-id=\"399787\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399787\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?fit=1280%2C1280&amp;ssl=1\" data-orig-size=\"1280,1280\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy (1)\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?fit=723%2C723&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=723%2C723&#038;ssl=1\" alt=\"Stunning icebergs floating in a calm, reflective Arctic water under a soft sunrise, showcasing intricate shapes and textures of ice.\" class=\"wp-image-399787\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=1200%2C1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=800%2C800&amp;ssl=1 800w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=600%2C600&amp;ssl=1 600w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=400%2C400&amp;ssl=1 400w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=200%2C200&amp;ssl=1 200w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=450%2C450&amp;ssl=1 450w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=60%2C60&amp;ssl=1 60w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?resize=550%2C550&amp;ssl=1 550w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?w=1280&amp;ssl=1 1280w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From <a href=\"https:\/\/rclutz.com\/2025\/09\/02\/surplus-arctic-ice-persists-to-end-of-august-2025\/\">Science Matters<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By\u00a0<a href=\"https:\/\/rclutz.com\/author\/ronaldrc\/\">Ron Clutz<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average. Then in June the gap reopened and in July the melting pace matched the average, abeit four days in advance of average. In mid-August MASIE showed the Arctic ice extent matching the 19-year average.\u00a0 Mid-month Arctic ice went above average and remained in surplus, ranging from a high of +231k km2 to +160k km2 at end of August.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"471\" data-attachment-id=\"399776\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399776\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?fit=1006%2C656&amp;ssl=1\" data-orig-size=\"1006,656\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?fit=723%2C471&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?resize=723%2C471&#038;ssl=1\" alt=\"Line graph depicting Arctic ice extents for August, showing data from multiple years with a focus on 2025, 2024, 2023, and average extents over 19 years. The Y-axis represents ice extents in million square kilometers, while the X-axis represents days of the year.\" class=\"wp-image-399776\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?w=1006&amp;ssl=1 1006w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?resize=300%2C196&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-46.png?resize=768%2C501&amp;ssl=1 768w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">During August the average year loses 1.9M km2 of ice extent.&nbsp; MASIE on day 213 was 308k km2 down, and the gap closed steadily, going into surplus on day 230. Note 2020 and 2024 were well&nbsp; below average mid-August.&nbsp; 2024 ended nearly average, while 2020 went down almost off the chart. Meanwhile SII v.4 started August ~400k km2 lower than MASIE, increasing to -690k mid month, before drawing closer to MASIE (-200k km2) on the last reported day 242. More on what happened to SII in footnote.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The regional distribution of ice extents is shown in the table below. (Bering and Okhotsk seas are excluded since both are now virtually open water.)<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Region<\/strong><\/td><td><strong>2025243<\/strong><\/td><td><strong>Day 243 Ave.<\/strong><\/td><td><strong>2025-Ave.<\/strong><\/td><td><strong>2020243<\/strong><\/td><td><strong>2025-2020<\/strong><\/td><\/tr><tr><td>&nbsp;(0) Northern_Hemisphere<\/td><td>5112372<\/td><td>4952249<\/td><td>160123<\/td><td>4345398<\/td><td>766974<\/td><\/tr><tr><td>&nbsp;(1) Beaufort_Sea<\/td><td>646546<\/td><td>569909<\/td><td>76637<\/td><td>763281<\/td><td>-116735<\/td><\/tr><tr><td>&nbsp;(2) Chukchi_Sea<\/td><td>400517<\/td><td>284622<\/td><td>115895<\/td><td>212438<\/td><td>188079<\/td><\/tr><tr><td>&nbsp;(3) East_Siberian_Sea<\/td><td>563058<\/td><td>360155<\/td><td>202902<\/td><td>176996<\/td><td>386062<\/td><\/tr><tr><td>&nbsp;(4) Laptev_Sea<\/td><td>172574<\/td><td>175114<\/td><td>-2540<\/td><td>1029<\/td><td>171545<\/td><\/tr><tr><td>&nbsp;(5) Kara_Sea<\/td><td>2579<\/td><td>48983<\/td><td>-46404<\/td><td>23958<\/td><td>-21379<\/td><\/tr><tr><td>&nbsp;(6) Barents_Sea<\/td><td>0<\/td><td>15952<\/td><td>-15952<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>&nbsp;(7) Greenland_Sea<\/td><td>106688<\/td><td>167723<\/td><td>-61035<\/td><td>192361<\/td><td>-85673<\/td><\/tr><tr><td>&nbsp;(8) Baffin_Bay_Gulf_of_St._Lawrence<\/td><td>61034<\/td><td>27656<\/td><td>33378<\/td><td>5016<\/td><td>56019<\/td><\/tr><tr><td>&nbsp;(9) Canadian_Archipelago<\/td><td>278943<\/td><td>298169<\/td><td>-19226<\/td><td>273116<\/td><td>5827<\/td><\/tr><tr><td>&nbsp;(10) Hudson_Bay<\/td><td>8604<\/td><td>20611<\/td><td>-12006<\/td><td>23611<\/td><td>-15007<\/td><\/tr><tr><td>&nbsp;(11) Central_Arctic<\/td><td>2870279<\/td><td>2982526<\/td><td>-112247<\/td><td>2672903.81<\/td><td>197375<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The table shows large surpluses in Eurasian basins&nbsp; Beaufort, Chukchi and E. Siberian, more than offsetting deficits in Central Arctic, Kara and Greenland seas. Hudson Bay is mostly open water at this time of year. 2025 exceeds the average ice extents by 160k km2, or 3%, and is 767k km2 greater than 2020, or nearly 0.8 Wadhams of ice extent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">September monthly average ice extent is considered the annual minimum for climate purposes.\u00a0 Note also that typically the lowest daily value occurs mid-September, with a small positive gain between the end of August and end of September.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"729\" data-attachment-id=\"399778\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399778\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?fit=735%2C741&amp;ssl=1\" data-orig-size=\"735,741\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?fit=723%2C729&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?resize=723%2C729&#038;ssl=1\" alt=\"A detailed map of the Arctic region, highlighting various seas and basins such as the Canada Basin, Beaufort Sea, and Chukchi Sea, with topographical features labeled in yellow.\" class=\"wp-image-399778\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?w=735&amp;ssl=1 735w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?resize=298%2C300&amp;ssl=1 298w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-48.png?resize=60%2C60&amp;ssl=1 60w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Why is this important?\u00a0 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All the claims of global climate emergency depend on dangerously higher temperatures, lower sea ice, and rising sea levels.\u00a0 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The lack of additional warming prior to 2023 El Nino is documented in a post\u00a0<a href=\"https:\/\/rclutz.com\/2025\/08\/05\/sh-drives-uah-temps-cooler-july-2025\/\"><strong>SH Drives UAH Temps Cooler July 2025.<\/strong><\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"249\" data-attachment-id=\"399780\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399780\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?fit=1431%2C494&amp;ssl=1\" data-orig-size=\"1431,494\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?fit=723%2C249&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?resize=723%2C249&#038;ssl=1\" alt=\"Graph showing UAHv6 global temperature anomalies alongside CO2 levels over time, with blue data points indicating temperature changes and a pink line representing CO2 concentrations.\" class=\"wp-image-399780\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?resize=1024%2C353&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?resize=300%2C104&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?resize=768%2C265&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?resize=1200%2C414&amp;ssl=1 1200w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-49.png?w=1431&amp;ssl=1 1431w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The lack of acceleration in sea levels along coastlines has been discussed also.&nbsp; See&nbsp;<strong><a href=\"https:\/\/rclutz.com\/2024\/02\/01\/observed-vs-imagined-sea-levels-2023-update\/\">Observed vs. Imagined Sea Levels 2023 Update<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also, a longer-term perspective is informative:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"546\" height=\"379\" data-attachment-id=\"399783\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399783\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-51.png?fit=546%2C379&amp;ssl=1\" data-orig-size=\"546,379\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-51.png?fit=546%2C379&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-51.png?resize=546%2C379&#038;ssl=1\" alt=\"Graph illustrating post-glacial sea level rise over thousands of years, highlighting natural and man-made contributions to sea level changes.\" class=\"wp-image-399783\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-51.png?w=546&amp;ssl=1 546w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-51.png?resize=300%2C208&amp;ssl=1 300w\" sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Footnote Regarding&nbsp; SII v.4<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NSDIC acknowledged my query regarding the SII (Sea Ice Index) dataset. While awaiting an explanation I investigated further. My last download of the SII Daily Arctic Ice Extents was on July 30, meaning that the most recent data in that file was day 210, July 29. The header on that file was Sea_Ice_Index_Daily_Extent_G02135_v3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then on August 1, the downloaded file had the heading Sea_Ice_Index_Daily_Extent_G02135_v4. So it appears that these are now the values from a new version of SII. As I wrote in my query, since March 14 all of the values for Arctic Ice Extents are lower in this new record. The graph above shows the implications for August as an example of estimates from SIIv.4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the past, SIIv.3 tracked MASIE with slightly lower values.&nbsp; But with v.4, larger monthly average deficits to MASIE were reported in July 2025 ( -282k km2) and in August (-440k km2).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The change started in January 2025 and will be the basis for future reporting.&nbsp; The logic for this is presented in this document:&nbsp;<a href=\"https:\/\/nsidc.org\/sites\/default\/files\/documents\/technical-reference\/nsidc-special-report-28.pdf\"><strong>Sea Ice Index Version 4 Analysis<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>In June 2025, NSIDC was informed that access to data from the Special Sensor Microwave<\/em><br><em>Imager\/Sounder (SSMIS) onboard the Defense Meteorological Satellite Program (DMSP)<\/em><br><em>satellites would end on July 31 (NSIDC, 2025). To prepare for this, we rapidly developed version<\/em><br><em>4 of the Sea Ice Index. This new version transitions from using sea ice concentration fields<\/em><br><em>derived from SSMIS data as input to using fields derived from the Advanced Microwave<\/em><br><em>Scanning Radiometer 2 (AMSR2) sensor onboard the Global Change Observation Mission \u2013 W1<\/em><br><em>(GCOM-W1) satellite.&nbsp;&nbsp;<\/em><em>On 29 July 2025, we learned that the Defense Department decision to terminate access to&nbsp;<\/em><em>DMSP data had been reversed and that data will continue to be available until September 2026.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>We are publishing Version 4, however, for these reasons:<\/em><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><em>\u2022 The SSMIS instruments are well past their designed lifespan and a transition to<\/em><br><em>AMSR2 is inevitable. Unless the sensors fail earlier, the DoD will formally end the<\/em><br><em>program in September 2026.<\/em><br><em>\u2022 Although access of SSMIS will continue through September 2026, the Fleet<\/em><br><em>Numerical Meteorology and Oceanography Center (FNMOC), where SSMIS data<\/em><br><em>from the DMSP satellite are downloaded, made an announcement that \u201cSupport<\/em><br><em>will be on a best effort basis and should be considered data of opportunity.\u201d This<\/em><br><em>means that SSMIS data will likely contain data gaps.<\/em><br><em>\u2022 We have developer time to make this transition now and may not in the future.<\/em><br><em>\u2022 We are confident that Version 4 data are commensurate in accuracy to those<\/em><br><em>provided by Version 3.<\/em><\/p>\n<\/blockquote>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"590\" height=\"361\" data-attachment-id=\"399785\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=399785\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-53.png?fit=590%2C361&amp;ssl=1\" data-orig-size=\"590,361\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-53.png?fit=590%2C361&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-53.png?resize=590%2C361&#038;ssl=1\" alt=\"A comic featuring a man with a skeptical expression in front of melting ice, with speech bubbles discussing predictions about ice disappearance.\" class=\"wp-image-399785\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-53.png?w=590&amp;ssl=1 590w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/image-53.png?resize=300%2C184&amp;ssl=1 300w\" sizes=\"auto, (max-width: 590px) 100vw, 590px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average. Then in June the gap reopened and in July the melting pace matched the average, abeit four days in advance of average. In mid-August MASIE showed the Arctic ice extent matching the 19-year average.\u00a0 Mid-month Arctic ice went above average and remained in surplus, ranging from a high of +231k km2 to +160k km2 at end of August.<\/p>\n","protected":false},"author":121246920,"featured_media":399787,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","advanced_seo_description":"Discover the recent trends in Arctic ice levels, with 2025 showing a significant surplus compared to historical averages.","jetpack_seo_html_title":"Surplus Arctic Ice Persisting: Analyzing 2025 Trends","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691819671,691837676,691837677,691822451,691830791],"class_list":{"0":"post-399774","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-arctic-ice","9":"tag-end-of-august-2025","10":"tag-fleet-numerical-meteorology-and-oceanography-center-fnmoc","11":"tag-masie","12":"tag-sii-sea-ice-index","14":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/0AQNjD50U5BSHXKhbscvVp0rGnUR6hoQdiZubFSx_Ij9yejmpV8YYFx1zXyOZCBb_Db7xH7SbDnfoSEwmkh0kWhbY0neImestka5gHpKz-03o-dSdp3Knnivmh-CEG9ab_VGSR0GV5xGzczFpZ2RI_eX0gaDy-1.jpeg?fit=1280%2C1280&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1FZY","jetpack-related-posts":[{"id":395863,"url":"https:\/\/climatescience.press\/?p=395863","url_meta":{"origin":399774,"position":0},"title":"Arctic Ice Returns to Mean Mid-August\u00a02025","author":"uwe.roland.gross","date":"18\/08\/2025","format":false,"excerpt":"After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average. Then in June the gap reopened and in July the melting pace matched the average, about four days in advance of average. Now mid-August MASIE shows the Arctic ice extent matching\u2026","rel":"","context":"In \"Arctic Ice\"","block_context":{"text":"Arctic Ice","link":"https:\/\/climatescience.press\/?tag=arctic-ice"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/OIG-2023-10-22T125511.784.jpeg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/OIG-2023-10-22T125511.784.jpeg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/OIG-2023-10-22T125511.784.jpeg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/OIG-2023-10-22T125511.784.jpeg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":397445,"url":"https:\/\/climatescience.press\/?p=397445","url_meta":{"origin":399774,"position":1},"title":"Surplus Arctic Ice late August\u00a02025","author":"uwe.roland.gross","date":"24\/08\/2025","format":false,"excerpt":"After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average. Then in June the gap reopened and in July the melting pace matched the average, abeit four days in advance of average. In mid-August MASIE showed the Arctic ice extent matching\u2026","rel":"","context":"In \"Arctic Ice\"","block_context":{"text":"Arctic Ice","link":"https:\/\/climatescience.press\/?tag=arctic-ice"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":389302,"url":"https:\/\/climatescience.press\/?p=389302","url_meta":{"origin":399774,"position":2},"title":"Arctic Ice Melting 4 Days Faster Mid-July\u00a02025","author":"uwe.roland.gross","date":"17\/07\/2025","format":false,"excerpt":"After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average. Then in June the gap reopened and in July the melting pace matched the average, about four days in advance of average.","rel":"","context":"In \"Arctic Ice\"","block_context":{"text":"Arctic Ice","link":"https:\/\/climatescience.press\/?tag=arctic-ice"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/07\/AQOBNPWFbYzY6aZVPr0ZR3jLBxK89PWC2CYuY7na9Y8eV_GKiVZLE0US0Bo2fT89jnBtB7LBgbPfy6eyg8QGRCTdOVugfVLLfdMAbx7BjZBdkF0oXm0XFMgeavinnJDra9CRBDFWuVCyS8slWKczLn90fJXHKg.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/07\/AQOBNPWFbYzY6aZVPr0ZR3jLBxK89PWC2CYuY7na9Y8eV_GKiVZLE0US0Bo2fT89jnBtB7LBgbPfy6eyg8QGRCTdOVugfVLLfdMAbx7BjZBdkF0oXm0XFMgeavinnJDra9CRBDFWuVCyS8slWKczLn90fJXHKg.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, 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Annual Dip September\u00a02025","author":"uwe.roland.gross","date":"29\/09\/2025","format":false,"excerpt":"After a sub-par March maximum, by end of May 2025 Arctic ice closed the gap with the 19-year average.\u00a0 In mid-August MASIE showed the Arctic ice extent matching the 19-year average.\u00a0 Mid month Arctic ice went above average and remained in surplus, ranging from a high of +231k km2 to\u2026","rel":"","context":"In \"Arctic Ice\"","block_context":{"text":"Arctic Ice","link":"https:\/\/climatescience.press\/?tag=arctic-ice"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQM10HmKgmFuz-Uy0dDj8rmRkOuVkvdLbZca1VvP4NCYoBLj0B5mzpRn-Dn3RVdvrHOKb2vFT7cSUt8icXD-zWAkbm_lHpSE15MagrvnypWe_EmvE5mmC23ioxZsfEz28DQW6A3ZxAe5ibNP170RLcpf2vtq7A.jpeg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":392416,"url":"https:\/\/climatescience.press\/?p=392416","url_meta":{"origin":399774,"position":4},"title":"Strange Sea Ice Data July End\u00a02025","author":"uwe.roland.gross","date":"02\/08\/2025","format":false,"excerpt":"Before presenting the MASIE and SII results for July, a note about a strange thing in today\u2019s Sea Ice Index report.\u00a0 I have sent a note to them requesting an explanation for why the values have been altered from those in the dataset just two days ago.\u00a0 When attempting to\u2026","rel":"","context":"In \"End of July 2025\"","block_context":{"text":"End of July 2025","link":"https:\/\/climatescience.press\/?tag=end-of-july-2025"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/0AQMm9gMrbwbdw9bS8whrR5ynJ8pOIE3ScBVAfilXbDRGTfwtxZdpfO8WWom5tW9k3LpHojI3VBGm3Zl7rnmQw95jqXIVVORoupiNCbBb4cFYsoIhiu2iuRu2QHCSH8ZhatN3rakO5tdqXjIt9KhwetRv6_hUrA-1.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/08\/0AQMm9gMrbwbdw9bS8whrR5ynJ8pOIE3ScBVAfilXbDRGTfwtxZdpfO8WWom5tW9k3LpHojI3VBGm3Zl7rnmQw95jqXIVVORoupiNCbBb4cFYsoIhiu2iuRu2QHCSH8ZhatN3rakO5tdqXjIt9KhwetRv6_hUrA-1.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, 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