{"id":462711,"date":"2026-08-13T11:09:56","date_gmt":"2026-08-13T18:09:56","guid":{"rendered":"https:\/\/climatescience.press\/?p=462711"},"modified":"2026-08-13T11:09:58","modified_gmt":"2026-08-13T18:09:58","slug":"earths-dimming-mirror-how-contracting-clouds-are-rewriting-the-climate-equation","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=462711","title":{"rendered":"Earth\u2019s Dimming Mirror: How Contracting Clouds Are Rewriting the Climate Equation"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"485\" data-attachment-id=\"462713\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=462713\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?fit=1168%2C784&amp;ssl=1\" data-orig-size=\"1168,784\" data-comments-opened=\"1\" data-image-meta=\"{&quot;credit&quot;:&quot;\\u00fe&quot;,&quot;caption&quot;:&quot;Signature: 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&quot;}\" data-image-title=\"0 Earth\u2019s Dimming Mirror  How Contracting Clouds Are Rewriting the Climate Equation\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Signature: 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&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?fit=723%2C485&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation-1024x687.jpg?resize=723%2C485&#038;ssl=1\" alt=\"\" class=\"wp-image-462713\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?resize=1024%2C687&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?resize=300%2C201&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?resize=768%2C516&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?resize=640%2C430&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/08\/0-Earths-Dimming-Mirror-How-Contracting-Clouds-Are-Rewriting-the-Climate-Equation.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">AI generated by Grok<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Clouds remain one of the largest uncertainties in climate science (feedbacks, representation in models, attribution of trends).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Satellite records show declining reflectivity\/albedo in recent decades, and dynamical shifts in cloud regimes are documented.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Clouds both cool and warm the Earth<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling effect (shortwave \/ albedo effect)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clouds reflect incoming sunlight back to space.<\/li>\n\n\n\n<li>This reduces the amount of solar energy absorbed by the surface and atmosphere.<\/li>\n\n\n\n<li>Low, thick, bright clouds (stratus, stratocumulus) are especially effective at this.<\/li>\n\n\n\n<li>Globally, this cooling effect is strong \u2014 without clouds, Earth would be significantly warmer.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Warming effect (longwave \/ greenhouse effect)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clouds absorb infrared (heat) radiation emitted by the Earth\u2019s surface and re-emit some of it back downward.<\/li>\n\n\n\n<li>This traps heat in the lower atmosphere, similar to greenhouse gases.<\/li>\n\n\n\n<li>High, thin clouds (cirrus) are particularly effective at this because they are cold and let a lot of sunlight through while still blocking outgoing heat.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Net effect<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On average, clouds have a net cooling effect on the current climate (the shortwave cooling is larger than the longwave warming).<\/li>\n\n\n\n<li>However, the balance varies strongly by cloud type, altitude, thickness, and location:\n<ul class=\"wp-block-list\">\n<li>Low clouds \u2192 net cooling<\/li>\n\n\n\n<li>High clouds \u2192 often net warming<\/li>\n\n\n\n<li>Mid-level clouds \u2192 more mixed<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When the climate warms, clouds themselves change (amount, height, thickness, type).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These changes create cloud feedbacks:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If low reflective clouds decrease \u2192 less cooling \u2192 positive feedback (amplifies warming)<\/li>\n\n\n\n<li>If high clouds rise higher \u2192 stronger greenhouse effect \u2192 positive feedback<\/li>\n\n\n\n<li>Other changes can produce negative feedbacks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why cloud feedbacks remain the largest source of uncertainty in climate sensitivity estimates (as assessed by the IPCC).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Clouds cool Earth by reflecting sunlight and warm it by trapping heat.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The net result today is cooling, but how that balance shifts in a warmer world is still one of the key open questions in climate science.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>CERES satellite data show <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Earth\u2019s planetary albedo has declined since 2000, increasing absorbed solar radiation. A large part of this decline is attributed to reductions in the coverage or optical thickness of reflective (especially low) clouds \u2014 often described as \u201ccloud contraction\u201d or decreases in high-reflectivity cloud regimes. This is one of the main reasons Earth\u2019s energy imbalance has roughly doubled over the CERES record.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CERES (Clouds and the Earth\u2019s Radiant Energy System) provides the primary continuous satellite record of Earth\u2019s top-of-atmosphere (TOA) radiation budget, including planetary albedo, since March 2000.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CERES instruments (on Terra, Aqua, Suomi-NPP, and NOAA-20) measure:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reflected shortwave (solar) radiation<\/li>\n\n\n\n<li>Outgoing longwave (thermal infrared) radiation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Planetary (TOA) albedo<\/strong> is calculated as:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics style=\"color: black; background-color: transparent; font-family: sans-serif;\"><mrow style=\"color: black; background-color: transparent; font-family: sans-serif;\"><mtext style=\"color: black; background-color: transparent; font-family: sans-serif;\">Albedo<\/mtext><mo style=\"color: black; background-color: transparent; font-family: sans-serif;\">=<\/mo><mfrac style=\"color: black; background-color: transparent; font-family: sans-serif;\"><mtext style=\"color: black; background-color: transparent; font-family: sans-serif;\">Reflected&nbsp;shortwave&nbsp;flux&nbsp;(TOA&nbsp;SW&nbsp;up)<\/mtext><mtext style=\"color: black; background-color: transparent; font-family: sans-serif;\">Incoming&nbsp;solar&nbsp;flux<\/mtext><\/mfrac><\/mrow><\/semantics><\/math><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The flagship climate data product is <strong>CERES Energy Balanced and Filled (EBAF)<\/strong> (currently Edition 4.2 \/ 4.2.1). It provides monthly global, zonal, and 1\u00b0\u00d71\u00b0 regional means of all-sky and clear-sky fluxes, with the global net TOA flux constrained to match independent estimates of ocean heat uptake. Data extend through at least early 2026 in recent releases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Official portal: <a href=\"https:\/\/ceres.larc.nasa.gov\/\" rel=\"noopener\" target=\"_blank\">https:\/\/ceres.larc.nasa.gov\/<\/a> (data ordering, visualization tools, quality summaries, and documentation available there).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CERES is widely regarded as the gold-standard observational record for TOA radiation budget trends.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uncertainties remain in exact attribution of cloud vs. aerosol vs. surface contributions and in the precise magnitude of longer-term trends due to instrument transitions and calibration, but the overall direction (declining albedo \u2192 rising ASR and EEI) is robust across editions and independent datasets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_____________________________________________________________________________________<\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\"><strong>Earth\u2019s dimming mirror: cloud contraction and the rise of albedo governance<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Here is the open-access PDF of the paper:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Published:<\/strong> Environmental Research Letters 21 141002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DOI:<\/strong> <a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1748-9326\/ae8a67\">10.1088\/1748-9326\/ae8a67<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(Received 12 May 2026; revised 6 July 2026; accepted 14 July 2026; published 22 July 2026.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Authors:<\/strong> Gianni Bellocchi,&nbsp;Vinay Kumar,&nbsp;Fredrik Charpentier Ljungqvist and&nbsp;Nazzareno Diodato<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Abstract (slightly cleaned from the PDF extraction)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Earth has reflected progressively less solar radiation since the start of the satellite era (1979), amplifying the planetary energy imbalance. Satellite analyses attribute the trend primarily to circulation-driven contraction of reflective cloud regimes, whereas process-based studies emphasize surface reflectivity changes. We argue that these perspectives are dynamically linked: as cloud cover contracts, diminishing atmospheric masking elevates the realized climatic leverage of surface albedo. This coupling makes surface reflectivity an increasingly important and manageable regulator of solar absorption under clearer-sky conditions. We propose an integrated governance framework that explicitly incorporates albedo management alongside carbon management.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Structure and key points<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Growing energy imbalance<\/strong><br>CERES data show Earth\u2019s energy imbalance roughly doubled since the early 2000s (\u22480.5 \u2192 1.0 W m\u207b\u00b2). Ocean heat content confirms the acceleration. The authors describe a \u201cclearing-sky\u201d phase (declining aerosols, reduced low-cloud cover, cryosphere reflectivity loss) that lets more shortwave radiation reach the surface, increasing the importance of surface albedo. Regional amplification is noted (e.g., grasslands rising above 1.7 W m\u207b\u00b2).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cloud-regime contraction as a leading driver<\/strong><br>Citing Tselioudis et al., the paper states that contraction of high-reflectivity cloud regimes accounts for \u22480.37 W m\u207b\u00b2 decade\u207b\u00b9, or roughly 80 %, of the observed increase in absorbed solar radiation over 2001\u20132024. This is linked to large-scale dynamical shifts (narrowing of the ITCZ and poleward shift of mid-latitude storm tracks). Cloud contraction is presented as increasing (not replacing) the radiative influence of the surface by reducing atmospheric<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Surface albedo as a strategic, manageable lever<\/strong><br>Land-use and management can change surface albedo by 0.05\u20130.20. The authors discuss practices such as cover cropping, residue retention, and high-albedo urban materials. They note the paradox that biogeophysical (albedo) and biogeochemical (carbon) effects can have opposite signs (e.g., afforestation can darken the surface while sequestering carbon) and therefore call for joint evaluation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Historical (Mediterranean) context<\/strong><br>Multi-centennial cloudiness reconstructions show cloud cover peaking around the coldest phase of the Little Ice Age (~1600 CE) and then declining toward modern minima. The decline began during the later Little Ice Age, preceding strong anthropogenic greenhouse-gas forcing. Suggested contributors include natural variability (post-volcanic recovery, solar activity, AMO) and historical land-use change (European deforestation reducing moisture recycling and convective clouds).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The paper is a perspective, not original observational research. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It synthesizes existing satellite, energy-budget, and paleo\/historical evidence and advocates for \u201calbedo governance\u201d as a policy complement to carbon management.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CERES satellite data show Earth\u2019s planetary albedo has declined since 2000, increasing absorbed solar radiation. A large part of this decline is attributed to reductions in the coverage or optical thickness of reflective (especially low) clouds \u2014 often described as \u201ccloud contraction\u201d or decreases in high-reflectivity cloud regimes. This is one of the main reasons Earth\u2019s energy imbalance has roughly doubled over the CERES record.<\/p>\n","protected":false},"author":121246920,"featured_media":462713,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"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":[691830548,691818432,691830550,691844676,691820367],"class_list":["post-462711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-ceres-clouds-and-the-earths-radiant-energy-system","tag-clouds","tag-earths-energy-imbalance","tag-planetary-toa-albedo","tag-solar-radiation","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1Wn5","jetpack-related-posts":[{"id":358490,"url":"https:\/\/climatescience.press\/?p=358490","url_meta":{"origin":462711,"position":0},"title":"New Study: The Warming Trend Since 2013 Explained by Increases in Absorbed Solar Radiation, Not CO2","author":"uwe.roland.gross","date":"12\/24\/2024","format":false,"excerpt":"Instead, a\u00a0new study\u00a0published in the journal\u00a0Science\u00a0contends that decreasing cloud albedo and the consequent increase in ASR or absorbed solar radiation (+0.97 to 1.10 W\/m\u00b2\/decade according to ERA5 and CERES, respectively), explains the warming over the last decade. 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