Natural Variability Domination: Defying Models, Scientists Find LESS Extreme Precipitation In Recent Decades

Higher frequencies of drought and extreme rainfall are assumed to be associated with modern climate change. But long-term studies in both hemispheres indicate extreme precipitation patterns were more common prior to the 20th and 21st centuries. Natural variability dominates precipitation patterns so thoroughly that an anthropogenic signal cannot be detected in observed records.

Internal climate variability (ICV) masks detection of an anthropogenic influence in extreme rainfall patterns (Bhatia and Ganguly, 2019).

Image Source: Bhatia and Ganguly, 2019

Contrary to modeled expectations, there has been no “coherent picture” of an increase in extreme precipitation on a global scale in recent decades (Tabari and Willems, 2018).

Image Source: Tabari and Willems, 2018

There has been “little unequivocal evidence” of an acceleration of the hydrological cycle on a global scale in recent decades. Instead, recent trends are “caused by internal climate variability” (Miralles et al., 2016).

Image Source: Miralles et al., 2016

“No evidence was found for changes in extreme precipitation attributable to climate change in the available observed record” (van der Wiel et a., 2016).

Image Source: van der Wiel et a., 2016

“Natural variability appears to dominate current observed trends” in precipitation extremes (Kendon et al., 2018).

Image Source: Kendon et al., 2018

Since 1983, there has been no increasing or decreasing trends in precipitation detected on a global scale (Nguyen et al., 2018).

Image Source: Nguyen et al., 2018

There have been “no significant trends” in extreme precipitation (floods or droughts) on the East and West US coasts observed in the last 145 years. Further, “significant drought conditions that were common prior to 1900 have not been experienced by the present population“(Christy, 2019).

Image Source: Christy, 2019

There are “no significant annual trends” in extreme precipitation in central China (Yellow River region). Actually, warmingwould bring less extreme heavy precipitation” (Jiang et al., 2019).

Image Source: Jiang et al., 2019

Not warm, but “cold tropical Pacific Ocean conditions are the principal driver of pan-[continental United States] droughts” (Baek et al., 2019).

Image Source: Baek et al., 2019

For Antarctica as a whole, “there has been no significant change in the precipitation from EPEs [extreme precipitation events] over the period considered here [1979-2016]” (Turner et al., 2019).

Image Source: Turner et al., 2019

An intensification of the hydrological cycle – the wet-gets-wetter-dry-gets-drier paradigm – was more evident prior to the 20th century according to Northern Hemisphere proxy evidence over the last 1200 years (Ljungqvist et al., 2016).

Image Source: Ljungqvist et al., 2016

Megadroughts and flood events “were more severe, extensive, and prolonged over Northern Hemisphere land areas before the 20th century” (Cook et al., 2015).

Image Source: Cook et al., 2015

For the Southern Hemisphere (Australia), extreme patterns in drought and flood events were “signficantly longer and more frequent” prior to 1900 (Tozer et al., 2016).

Image Source:   Tozer et al., 2016

Extreme daily rainfall events were “more extreme [during 1839-1899] than anything in the modern record” for the Australian cities of Melbourne, Sydney, and Adelaide (Ashcroft et al., 2019).

Image Source: Ashcroft et al., 2019

5 responses to “Natural Variability Domination: Defying Models, Scientists Find LESS Extreme Precipitation In Recent Decades”

  1. tom0mason

    The sun and oceans (and so indirectly the moon) dominates how our planet’s climate changes. Their natural cycles command how and when all local climates will change. CO2 just feeds the plants and by extension the whole biosphere; that greening will eventually feature in how the local climate changes. That is all CO2 appears to do wrt climate — green the planet with a sustainable nutrient.

    Forward to 600ppm atmospheric CO2 and a greener, more productive world

    Human production of CO2 doesn’t change the climate, nature does.

  2. Martin

    ‘ atural variability dominates precipitation patterns so thoroughly that an anthropogenic signal cannot be detected’

    It was also true for temperatures until they ‘adjusted’ the record.

  3. tom0mason

    The model do not run on basic science, they run on basic ‘CO2 causes warming assumptions’, and are tuned to give the required output.

    Predictability of Weather and Climate
    V. Krishnamurthy

    The Art and Science of Climate Model Tuning
    Frédéric Hourdin

    These show why the reliance on ‘Climate Models’ is not good science, certainly it is not the kind of science that should be use to radically change the basic operating structure of the world’s economies, the world’s social structures, and everyone’s way of living.

    ‘Climate science’ is neither complete nor authoritative, it is in it’s juvenile stages, not a mature basis to launch such radical assaults on mankind and nature.

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