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How El Nino La Nina And The Sun Drive Climate Change!

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rangerrebew:
How El Nino La Nina And The Sun Drive Climate Change!
10 hours ago Guest Blogger 

By Jim Steele

The short answer, based on peer-reviewed science is, small increases in solar insolation increase the tropical trade winds. Stronger trade winds push the Pacific Ocean into a La Nina-like state that reduces cloud cover in the eastern Pacific and eastern Atlantic. Less cloud cover during La Nina-like conditions increase heat flux into the oceans, where the greatest heat flux is now observed. That greater flux warms the oceans and via ocean currents warms the world as it ventilates, as it does now. In contrast El Nino-like conditions increase cloud cover over the eastern Pacific and reduces heat flux into the oceans which cools the world as it did during the Little Ice Age.


In the American southwest, natural La Nina-like conditions induce dry climates and reduce vegetation. Panel “A” from Jimenez-Moreno (2021) using proxy evidence from precipitation-sensitive Pinyon Pines in southwest, illustrates 1200 years of climate change and the oscillating effects of EL Nino and La Nina. When solar irradiance was low during the solar minimums, reduced trade winds created EL Nino-like conditions that enabled greater precipitation across the southwest, and greater growth of Pinyon Pines during the Little Ice Age (LIA) from 1400 to 1850 AD.

Previously from 800 to 1400 AD, solar maximums increased the trade winds and caused the American southwest to suffer megadroughts due to dominance of La Nina-like conditions.


Panel “B” represents the standard contrast between El Nino and La Nino events. During La Nina-like conditions, strong trade winds blow warm water to the west and cause upwelling of cool subsurface water which reduces cloud cover. Reduced cloud cover amplifies solar heating of the oceans. Thus, Southwest megadroughts and warmer temperatures of the Medieval Warm Period strongly correlate with La Nina-like conditions.

https://wattsupwiththat.com/2024/05/20/how-el-nino-la-nina-and-the-sun-drive-climate-change/

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