{"id":372880,"date":"2025-03-31T08:27:50","date_gmt":"2025-03-31T06:27:50","guid":{"rendered":"https:\/\/climatescience.press\/?p=372880"},"modified":"2025-03-31T08:27:52","modified_gmt":"2025-03-31T06:27:52","slug":"examining-the-global-carbon-projects-estimates-of-co2-sources-and-sinks-1959-2023","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=372880","title":{"rendered":"Examining the Global Carbon Project\u2019s Estimates of CO2 Sources and Sinks, 1959-2023"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

From Roy Spencer, PhD<\/a><\/p>\n\n\n\n

March 30th, 2025, by Roy W. Spencer, Ph. D.<\/p>\n\n\n\n

Summary of Main Points<\/em><\/strong><\/p>\n\n\n\n

By choosing the \u201cbest\u201d models and estimates of CO2 fluxes (those which best explain year-to-year changes in atmospheric CO2 content as measured at Mauna Loa, HI) for the period 1959-2023 as provided by the Global Carbon Project, a multiple linear regression of yearly Mauna Loa CO2 changes against those \u201cbest\u201d estimates of sources and sinks leads to the following alterations to the \u201cofficial \u201d Global Carbon Project estimates of the sources and sinks leading to the observed rise in atmospheric CO2. (NOTE: being a statistical exercise, this does not constitute \u201cproof\u201d \u2026 these are just some areas that carbon budget modelers might want to look into when tweaking their models):<\/em><\/p>\n\n\n\n

    \n
  1. Global anthropogenic CO2 emissions appear to be 30% larger than reported (I find this hard to believe\u2026 again, statistics are not necessarily proof)<\/em>.<\/li>\n\n\n\n
  2. The Land Sink of CO2 has been underestimated by an average of about 25%<\/em><\/li>\n\n\n\n
  3. The Ocean Sink of CO2 has been overestimated by about 20% (I don\u2019t know whether they include CO2 outgassing)<\/em>.<\/li>\n\n\n\n
  4. The Land Use source of CO2 (primarily biomass burning) has been overestimated by about a factor of 2 (very uncertain)<\/em><\/li>\n\n\n\n
  5. The cement carbonation sink has been underestimated by about a factor of 7 (very uncertain)<\/em><\/li>\n\n\n\n
  6. There is a remaining unknown CO2 sink that has averaged 0.2 ppm\/yr during 1959-2023 (this could just be a residual of other statistical errors)<\/em>.<\/li>\n<\/ol>\n\n\n\n

    Background<\/strong><\/p>\n\n\n\n

    Many researchers have spent their careers trying to estimate the various global sources and sinks of atmospheric CO2. The main net sources are anthropogenic emissions (including cement production) and land use (mainly biomass burning). The main CO2 sinks are land (vegetation and soil storage), the ocean (mixing the \u201cexcess\u201d atmospheric CO2 downward\u2026 biological uptake remains largely unknown), and cement carbonation (old cement absorbs atmospheric CO2).<\/p>\n\n\n\n

    The Global Carbon Project (GCP) periodically summarizes various estimates of these sources and sinks and produces easily accessible spreadsheets of the data. I suppose for political expediency (don\u2019t insult your peers), the GCP (like the IPCC does for climate models) just takes virtually all of the estimates of CO2 fluxes and averages them together to produce a single \u201cbest\u201d estimate of specific fluxes on a yearly basis. For example, they average 20 (!) different land models result for yearly net CO2 fluxes into the land surface (I say \u201cinto\u201d because the current atmospheric \u201cexcess\u201d of CO2, around 50% above pre-Industrial levels, causes the land and ocean to be net sinks of CO2).<\/p>\n\n\n\n

    What I Did<\/strong><\/p>\n\n\n\n

    But since I am not part of the global carbon budget research community, I can pick and choose which models and data-based estimates I use. Some of these models are better than others at explaining the yearly increase in atmospheric CO2 at Mauna Loa, Hawaii, and here I will provide an analysis using only the best estimates.<\/p>\n\n\n\n

    (Now, some researchers believe that an average of all estimates will be better than any individual estimates. I don\u2019t believe that\u2026 and neither should you. As a simple example, you can\u2019t make a better estimate of something by averaging a good estimate with a bad estimate.)<\/p>\n\n\n\n

    So, what I did was to examine how well each individual model estimate (or sometimes an observational estimate) helped to explain the yearly CO2 increases at Mauna Loa. I then chose the best ones and averaged them together. Then I regress the yearly CO2 changes at Mauna Loa against these averages. As Fig. 1 shows, this produces a much better estimate of the Mauna Loa CO2 record than the GCP estimates of CO2 fluxes based upon all available estimates from various sources.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Now, to be fair, part of this better agreement comes from the statistical regression. The GCP estimates (quite admirably) use all of the available estimates based upon physics and parameterizations and then sees how well the results match the Mauna Loa record. And they even include the yearly \u201cresidual\u201d in their\u00a0spreadsheet<\/a>\u00a0to show how well (or how poorly) the models fit the data. Kudos.<\/p>\n\n\n\n

    But I used the best models and estimates, and then use multiple linear regression, to see how closely the data can be fit to the Mauna Loa observations. Again, the year-to-year changes in observed CO2 concentrations are statistically related to the sources and sinks of CO2 which come from (1) anthropogenic emissions, (2) land use emissions, (3) land vegetative and soil uptake, (4) ocean uptake, and (5) cement carbonation (old cement removes CO2 from the atmosphere).<\/p>\n\n\n\n

    The results give a total regression model explained variance of 81%. The regression coefficients tell us whether the individual CO2 budget terms (sources and sinks of CO2) have been underestimated or overestimated. If the terms equal +1 (for sources) or -1 (for sinks), then the model estimates of the yearly CO2 sources and sinks are (on average) unbiased in their explanation of yearly CO2 changes at Mauna Loa.<\/p>\n\n\n\n

    Again I emphasize that such statistical results can be misleading. Errors in one term\u2019s regression coefficient can cause errors in other terms\u2019 coefficients. But regression analysis can also sometimes can reveal insights into what physics might be missing<\/em>. I have seen both in my 40 years of doing such calculations.<\/p>\n\n\n\n

    Here are the results:<\/p>\n\n\n\n

    Global Anthropogenic Emissions<\/strong>: Coefficient = 1.3 (+\/-0.22) This suggests anthropogenic emissions have been underestimated by about 30%. I find this hard to believe. Energy use is pretty well known. Maybe the cement production source has been underestimated?<\/p>\n\n\n\n

    Global Land Use:<\/strong> Coefficient = 0.43 (+\/-0.45) This suggests land use emissions have been overestimated (but the coefficient uncertainty is large). Also, if there is little skill in a term, a lower coefficient will result due to the \u201cregression to the mean\u201d effect. This result suggests to me that yearly land use as a source of CO2 remains very uncertain.<\/p>\n\n\n\n

    Global Land Sink:<\/strong> Coefficient = -1.26 (+\/-0.16). This suggests the land (mainly vegetation) sink has been underestimated by maybe 25%. The error is the coefficient is pretty small, so I think this result is significant.<\/p>\n\n\n\n

    Global Ocean Sink<\/strong>: Coefficient = -0.80 (+\/- 0.49) This suggests the ocean sink has been overestimated (but with rather large uncertainty) by about 20%. I haven\u2019t looked at whether these ocean models include CO2 outgassing as the temperature rises (a small effect). I\u2019m not convinced that this coefficient is significantly different than 1.0, which would be the case if the models are unbiased in their estimates of the ocean sink.<\/p>\n\n\n\n

    Cement Carbonation Sink<\/strong>: (-7.3 +\/-4.9) This suggests the CO2 uptake by old cement has been greatly underestimated (but with large uncertainty). This is a surprisingly large number, and I don\u2019t know what to make of it.<\/p>\n\n\n\n

    I\u2019m not convinced of most of these conclusions, except maybe the vegetation sink of CO2 being underestimated by the models. There have been recent papers published finding some vegetation uptake processes have been underestimated by the models.<\/p>\n\n\n\n

    The global anthropogenic emissions source being underestimated is also intriguing. Being greater than 1, the 1.3 coefficient is the opposite of what we would get from regression if the yearly anthropogenic emissions estimates were poor. So, I\u2019m inclined to believe this is real.<\/p>\n\n\n\n

    Anyway, this was an quick-and-dirty exercise. Maybe 4 hours of my time. You can access the GCP data spreadsheet here<\/a>.<\/p>\n\n\n\n

    P.S. I\u2019m sure someone will ask about adding various natural factors: for example, global surface temperature (land and\/or ocean). Yes, that can be done.<\/em><\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    By choosing the \u201cbest\u201d models and estimates of CO2 fluxes (those which best explain year-to-year changes in atmospheric CO2 content as measured at Mauna Loa, HI) for the period 1959-2023 as provided by the Global Carbon Project, a multiple linear regression of yearly Mauna Loa CO2 changes against those \u201cbest\u201d estimates of sources and sinks leads to the following alterations to the \u201cofficial \u201d Global Carbon Project estimates of the sources and sinks leading to the observed rise in atmospheric CO2.<\/p>\n","protected":false},"author":121246920,"featured_media":372882,"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":"","jetpack_seo_html_title":"","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":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":[691829997,691834170,691823878,691819052],"class_list":{"0":"post-372880","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-carbon-dioxide-co","9":"tag-global-carbon-project-gcp","10":"tag-mauna-loa-observatory","11":"tag-models","13":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/03\/0roywspencer_13617_hot_summer_day_with_puffy_clouds_over_a_corn__82601fd1-84ed-4754-bc55-d3fd32ffe0f1.webp?fit=1536%2C768&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1z0c","jetpack-related-posts":[{"id":253081,"url":"https:\/\/climatescience.press\/?p=253081","url_meta":{"origin":372880,"position":0},"title":"CO2 Budget Model Update Through 2022: Humans Keep Emitting, Nature Keeps Removing","author":"uwe.roland.gross","date":"15\/04\/2023","format":false,"excerpt":"But clearly the international efforts to reduce CO2 emissions are having no obvious impact. 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The final result was that forest, plants and soil \u2013 as\u2026","rel":"","context":"In \"carbon dioxide (CO2)\"","block_context":{"text":"carbon dioxide (CO2)","link":"https:\/\/climatescience.press\/?tag=carbon-dioxide-co2"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/10\/0MLO-Aerial-103123-crop.jpeg?fit=1200%2C659&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/10\/0MLO-Aerial-103123-crop.jpeg?fit=1200%2C659&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/10\/0MLO-Aerial-103123-crop.jpeg?fit=1200%2C659&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/10\/0MLO-Aerial-103123-crop.jpeg?fit=1200%2C659&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/10\/0MLO-Aerial-103123-crop.jpeg?fit=1200%2C659&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":228142,"url":"https:\/\/climatescience.press\/?p=228142","url_meta":{"origin":372880,"position":5},"title":"New Paradigm-Shifting Study Finds Annual CO2 Flux Is Driven by Temperature-Dependent Sea Ice Flux","author":"uwe.roland.gross","date":"08\/11\/2022","format":false,"excerpt":"Annual carbon dioxide (CO2) and methane (CH4) change rates lag behind changes in sea ice extent by 7 months and 5 months, respectively.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/11\/image-330.png?fit=1024%2C714&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/11\/image-330.png?fit=1024%2C714&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/11\/image-330.png?fit=1024%2C714&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/11\/image-330.png?fit=1024%2C714&ssl=1&resize=700%2C400 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/372880","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/users\/121246920"}],"replies":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=372880"}],"version-history":[{"count":4,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/372880\/revisions"}],"predecessor-version":[{"id":372886,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/posts\/372880\/revisions\/372886"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=\/wp\/v2\/media\/372882"}],"wp:attachment":[{"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=372880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=372880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/climatescience.press\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=372880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}