{"id":268754,"date":"2023-07-21T23:15:48","date_gmt":"2023-07-21T21:15:48","guid":{"rendered":"https:\/\/climatescience.press\/?p=268754"},"modified":"2023-07-21T23:15:51","modified_gmt":"2023-07-21T21:15:51","slug":"models-wrong-again-looks-like-climate-change-is-making-rainfall-less-intense-globally","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=268754","title":{"rendered":"Models wrong again: Looks like climate change is making rainfall *less* intense globally"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

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

From CFACT<\/a><\/p>\n\n\n\n

By\u00a0Joanne Nova<\/a>\u00a0<\/p>\n\n\n\n

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

Despite twenty years of media stories telling us how every rain-bomb was \u201cclimate change\u201d, a new satellite study of rainfall suggests that during the last 20 years, the intensity of rainfall has mysteriously declined a little in most places. This is despite predictions it would increase, and CO2 itself rising by 41ppm globally during the same period.\u00a0 In terms of total emissions released by humans since the stone age, it\u2019s been a bonanza \u2014 in this 20-year period, we emitted 38% of all the emissions we ever emitted.<\/p>\n\n\n\n

So humans put out 656,000 Mt of CO2, and there\u2019s been either a decline or no trend at all in rainfall intensity.<\/p>\n\n\n\n

Is 38% of all human CO2 emissions enough of a test? The satellites cover all the Earth, including the oceans, which the met bureau gauges don\u2019t.<\/p>\n\n\n\n

Thanks to Kenneth Richards at\u00a0NoTricksZone<\/em>\u00a0for finding this paper:<\/strong><\/p>\n\n\n\n

New Study: 21st Century Precipitation Trends Have Become Less Intense Globally<\/a><\/p>\n\n\n\n

Hydrological processes were expected to intensify with warming. The opposite has happened.<\/p>\n\n\n\n

Per a new study, global precipitation intensity, measured in mm\/hour per century, has exhibited flat (large precipitation systems) to declining (medium and small systems) trends from 2001 to 2020.
Nearly every which way we look at it, across the year, on different continents in different seasons, rainfall intensity is not getting worse. Small and medium size \u201cprecipitation systems\u201d (red and yellow) have reduced in intensity in summer and winter and all over the globe. More widespread systems (green) are a wash with some up and some down, and none of it in a pattern that climate models predicted.<\/p>\n\n\n\n

\"\"
Fig. 9. Trends (unit: mm\/h per century) of the mean core-region precipitation intensity of precipitation systems categorized by different precipitation system sizes at the annual timescale in (a) nine continental regions and (b) six oceanic regions during the 2001\u20132020 period. * and ** denote the 0.1 and 0.05 significance levels, respectively.<\/figcaption><\/figure>\n\n\n\n

This is really quite complete. Small and medium size \u201cprecipitation systems\u201d have reduced in intensity in summer and winter and all over the globe. And larger weather systems have \u201cdone nothing much\u201d.<\/p>\n\n\n\n

\"\"
Fig. 8. Time series of the mean core-region precipitation intensity (in blue) of precipitation systems categorized by different precipitation system sizes (a1-3) at the annual scale and in (b1-3) warm seasons and (c1-3) cold seasons during the 2001\u20132020 period. The mean core-region precipitation intensity is calculated by the mean values of all the precipitation systems with different sizes during the study period. The 5-year moving average (in red) is also shown. Trends are calculated and shown, and * and ** denote the 0.1 and 0.05 significance levels, respectively.<\/figcaption><\/figure>\n\n\n\n

And if there is a climate change signal hidden under a declining natural trend, the problem is that those other mysterious forces are more powerful than CO2, yet we have no idea what they are or how to predict them. Call it climate poker. Would you like to bet your national economy on these models?<\/p>\n\n\n\n

This well-established theory is going swimmingly.<\/h4>\n\n\n\n

The UN experts are certain that rain will become more intense over most land regions. Listen to the peer-reviewed science. It\u2019s all simple really\u2026<\/p>\n\n\n\n

ScienceBrief Review:<\/a> Climate change increases extreme rainfall and the chance of floods<\/h4>\n\n\n\n

Theory<\/strong><\/p>\n\n\n\n

It is well established that the frequency and intensity of extreme rainfall increase more strongly with global mean surface temperature than does mean rainfall<\/strong> (Berg et al., 2013; Myhre et al., 2019) as the latter is limited by evaporation, whilst changes in extremes are also affected by local in-storm processes. In simple terms, warmer air can hold more water vapour that can subsequently fall as rain. For each degree of warming, the air\u2019s capacity for atmospheric water vapour increases at about +6% to +7% per degree of warming, assuming other atmospheric conditions remain roughly constant, known as Clausius-Clapeyron scaling (Allan et al., 2014). A warming atmosphere with more moisture can therefore<\/strong> produce more intense rainfall events, with this scaling providing a first approximation (Fowler et al., 2021a)\u2026<\/p>\n\n\n\n

Future projections<\/h3>\n\n\n\n

Relatively coarse-scale global climate models show\u00a0future increases in daily rainfall extremes over most land regions with warming<\/strong>\u00a0(Seneviratne & Hauser, 2020; Coppola et al., 2021a)\u2026.<\/p>\n\n\n\n

This ScienceBrief Review is consistent with the IPCC<\/strong>\u00a0Special Report\u00a0<\/strong>on 1.5 degrees (2018)\u00a0Chapter 3<\/a>\u00a0and Special Report on Climate Change and Land (2019)\u00a0Chapter 4<\/a>, both of which noted that human-induced global warming has already caused observed increases in frequency, intensity and\/or amount of extreme rainfall in several\u00a0regions<\/strong>.<\/p>\n\n\n\n

There\u2019s a consensus \u2014 it can\u2019t be wrong.<\/p>\n\n\n\n

The numbers:<\/h4>\n\n\n\n

Man-made CO2 emissions:  By 2001, humans had cumulatively produced 291,000 Mt of carbon from fossil fuels, and cement production, but by 2020 our total cumulative emissions amounted to 470,000 Mt. (CDIAC data). So from 2001-2020, mankind produced 179,000 Mt of carbon or 38% of all-time homo sapiens emissions. Converting pure carbon to CO2 means humans have emitted 656,000 Mt of CO2 yet seen either a decline or no trend at all in rainfall intensity.<\/p>\n\n\n\n

Global CO2 rose from 371ppm in 2001 all the way to 414ppm in 2020.<\/a><\/p>\n\n\n\n

REFERENCES<\/h4>\n\n\n\n

Zhang, Yan, (2023) Climatology and changes in internal intensity distributions of global precipitation systems over 2001\u20132020 based on IMERG, <\/a>Journal of Hydrology 620 (2023) 129386<\/p>\n\n\n\n

CO2 levels at\u00a0Mauna Loa<\/a><\/p>\n\n\n\n

CO2 emissions:\u00a0CDIAC<\/a><\/p>\n\n\n\n

This article originally appeared at\u00a0JoNova<\/a><\/em><\/p>\n\n\n\n

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

Author<\/h2>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n


Joanne Nova<\/a><\/p>\n\n\n\n

A prize-winning science graduate in molecular biology. She has given keynotes about the medical revolution, gene technology and aging at conferences. <\/p>\n\n\n\n

She hosted a children\u2019s TV series on Channel Nine, and has done over 200 radio interviews, many on the Australian ABC. <\/p>\n\n\n\n

She was formerly an associate lecturer in Science Communication at the ANU. <\/p>\n\n\n\n

She\u2019s author of The Skeptics Handbook which has been translated into 15 languages. Each day 5,000 people read joannenova.com.au<\/p>\n\n\n\n

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

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

This is despite predictions it would increase, and CO2 itself rising by 41ppm globally during the same period.\u00a0 In terms of total emissions released by humans since the stone age, it\u2019s been a bonanza \u2014 in this 20-year period, we emitted 38% of all the emissions we ever emitted.<\/p>\n","protected":false},"author":121246920,"featured_media":268767,"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":[691818056,691818153,691818076,691818381,691818126],"class_list":{"0":"post-268754","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-climate-change","9":"tag-climate-models","10":"tag-co2","11":"tag-ipcc","12":"tag-un","14":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/07\/image-640.png?fit=1920%2C1080&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-17UK","jetpack-related-posts":[{"id":213119,"url":"https:\/\/climatescience.press\/?p=213119","url_meta":{"origin":268754,"position":0},"title":"Biden falsely links Kentucky floods to \u2018climate change\u2019 \u2013 Reality Check: Floods \u2018have not increased in frequency or intensity\u2019 \u2013 White House ignores peer-reviewed studies & IPCC & data","author":"uwe.roland.gross","date":"08\/11\/2022","format":false,"excerpt":"\u2018The results of this study, for North America and Europe, provide a firmer foundation and support the conclusion of the IPCC (Hartmann et al., 2013) that compelling evidence for increased flooding at a global scale is lacking.\u2019","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/08\/image-393.png?fit=700%2C350&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/08\/image-393.png?fit=700%2C350&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/08\/image-393.png?fit=700%2C350&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/08\/image-393.png?fit=700%2C350&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":219288,"url":"https:\/\/climatescience.press\/?p=219288","url_meta":{"origin":268754,"position":1},"title":"Pakistan Floods Likely Made Worse by Warming\u2013BBC","author":"uwe.roland.gross","date":"09\/17\/2022","format":false,"excerpt":"There is, of course, no evidence that tropical cyclones are getting more frequent or intense in the Indian Ocean, so consequently there is also no evidence that last month\u2019s rainfall had anything to do with climate change.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/09\/image-828.png?fit=664%2C768&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/09\/image-828.png?fit=664%2C768&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/09\/image-828.png?fit=664%2C768&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":268703,"url":"https:\/\/climatescience.press\/?p=268703","url_meta":{"origin":268754,"position":2},"title":"Don\u2019t Be Fooled! 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