Mid-Holocene Northern Hemisphere warming driven by Arctic amplification.

https://arctichealth.org/en/permalink/ahliterature307667
Source
Sci Adv. 2019 12; 5(12):eaax8203
Publication Type
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't
Date
12-2019
Author
Hyo-Seok Park
Seong-Joong Kim
Andrew L Stewart
Seok-Woo Son
Kyong-Hwan Seo
Author Affiliation
Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea.
Source
Sci Adv. 2019 12; 5(12):eaax8203
Date
12-2019
Language
English
Publication Type
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't
Abstract
The Holocene thermal maximum was characterized by strong summer solar heating that substantially increased the summertime temperature relative to preindustrial climate. However, the summer warming was compensated by weaker winter insolation, and the annual mean temperature of the Holocene thermal maximum remains ambiguous. Using multimodel mid-Holocene simulations, we show that the annual mean Northern Hemisphere temperature is strongly correlated with the degree of Arctic amplification and sea ice loss. Additional model experiments show that the summer Arctic sea ice loss persists into winter and increases the mid- and high-latitude temperatures. These results are evaluated against four proxy datasets to verify that the annual mean northern high-latitude temperature during the mid-Holocene was warmer than the preindustrial climate, because of the seasonally rectified temperature increase driven by the Arctic amplification. This study offers a resolution to the "Holocene temperature conundrum", a well-known discrepancy between paleo-proxies and climate model simulations of Holocene thermal maximum.
PubMed ID
31844667 View in PubMed
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