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Revisiting the phys...
Revisiting the physical processes controlling the tropical atmospheric circulation changes during the Mid-Piacenzian Warm Period
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Zhang, Ke (author)
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Sun, Yong (author)
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Zhang, Zhongshi (author)
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Stepanek, Christian (author)
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Feng, Ran (author)
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Hill, Daniel (author)
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Lohmann, Gerrit (author)
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Dolan, Aisling (author)
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Haywood, Alan (author)
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Abe-Ouchi, Ayako (author)
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Otto-Bliesner, Bette (author)
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Contoux, Camille (author)
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Chandan, Deepak (author)
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Ramstein, Gilles (author)
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Dowsett, Harry (author)
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Tindall, Julia (author)
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Baatsen, Michiel (author)
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Tan, Ning (author)
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Peltier, William Richard (author)
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- Li, Qiang (author)
- Stockholms universitet,Institutionen för naturgeografi,Bolincentret för klimatforskning (tills m KTH & SMHI)
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Chan, Wing-Le (author)
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Wang, Xin (author)
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Zhang, Xu (author)
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Quaternary International. - 1040-6182 .- 1873-4553. ; 682, s. 46-59
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- The Mid-Piacenzian Warm Period (MPWP; 3.0–3.3 Ma), a warm geological period about three million years ago, has been deemed as a good past analog for understanding the current and future climate change. Based on 12 climate model outputs from Pliocene Model Intercomparison Project Phase 2 (PlioMIP2), we investigate tropical atmospheric circulation (TAC) changes under the warm MPWP and associated underlying mechanisms by diagnosing both atmospheric static stability and diabatic processes. Our findings underscore the advantage of analyzing atmospheric diabatic processes in elucidating seasonal variations of TAC compared to static stability assessments. Specifically, by diagnosing alterations in diabatic processes, we achieve a quantitative understanding and explanation the following TAC changes (incl. Strength and edge) during the MPWP: the weakened (annual, DJF, JJA) Northern Hemisphere and (DJF) Southern Hemisphere Hadley circulation (HC), reduced (annual, DJF) Pacific Walker circulation (PWC) and enhanced (annual, JJA) Southern Hemisphere HC and (JJA) PWC, and westward shifted (annual, DJF, JJA) PWC. We further addressed that the increasing bulk subtropical static stability and/or decreasing vertical shear of subtropical zonal wind - two crucial control factors for changes in subtropical baroclinicity - may promote HC widening, and vice versa. Consequently, our study of spatial diabatic heating and cooling, corresponding to upward and downward motions within the TAC, respectively, provides a new perspective for understanding the processes controlling seasonal TAC changes in response to surface warming.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Keyword
- Pliocene
- PlioMIP2
- Hadley circulation
- Walker circulation
- Diabatic heating/cooling
- Subtropical baroclinicity
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Zhang, Ke
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Sun, Yong
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Zhang, Zhongshi
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Stepanek, Christ ...
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Feng, Ran
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Hill, Daniel
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show more...
-
Lohmann, Gerrit
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Dolan, Aisling
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Haywood, Alan
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Abe-Ouchi, Ayako
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Otto-Bliesner, B ...
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Contoux, Camille
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Chandan, Deepak
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Ramstein, Gilles
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Dowsett, Harry
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Tindall, Julia
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Baatsen, Michiel
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Tan, Ning
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Peltier, William ...
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Li, Qiang
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Chan, Wing-Le
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Wang, Xin
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Zhang, Xu
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
- Articles in the publication
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Quaternary Inter ...
- By the university
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Stockholm University