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Drier tropical and subtropical Southern Hemisphere in the mid-Pliocene Warm Period

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Autor(es):
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Pontes, Gabriel M. [1, 2] ; Wainer, Ilana [1] ; Taschetto, Andrea S. [2, 3] ; Sen Gupta, Alex [2, 3] ; Abe-Ouchi, Ayako [4] ; Brady, Esther C. [5] ; Chan, Wing-Le [4] ; Chandan, Deepak [6] ; Contoux, Camille [7] ; Feng, Ran [5] ; Hunter, Stephen J. [8] ; Kame, Yoichi [9] ; Lohmann, Gerrit [10] ; Otto-Bliesner, Bette L. [5] ; Peltier, W. Richard [6] ; Stepanek, Christian [10] ; Tindall, Julia [8] ; Tan, Ning [7, 11] ; Zhang, Qiong [12, 13] ; Zhang, Zhongshi [12, 13, 11, 14]
Número total de Autores: 20
Afiliação do(s) autor(es):
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[1] Univ Sao Paulo, Oceanog Inst, Sao Paulo, SP - Brazil
[2] Univ New South Wales, Climate Change Res Ctr, Sydney, NSW - Australia
[3] Univ New South Wales, ARC Ctr Excellence Climate Extremes, Sydney, NSW - Australia
[4] Univ Tokyo, Ctr Earth Syst Dynam, Atmosphere & Ocean Res Inst, Tokyo - Japan
[5] Natl Ctr Atmospher Res, Boulder, CO 80307 - USA
[6] Univ Toronto, Dept Phys, Toronto, ON - Canada
[7] Univ Paris Saclay, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette - France
[8] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire - England
[9] Univ Tsukuba, Fac Life & Environm Sci, Tsukuba, Ibaraki - Japan
[10] Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Bremerhaven - Germany
[11] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing - Peoples R China
[12] Stockholm Univ, Dept Phys Geog, Stockholm - Sweden
[13] Stockholm Univ, Bolin Ctr Climate Res, Stockholm - Sweden
[14] Bjerknes Ctr Climate Res, NORCE Norwegian Res Ctr, Bergen - Norway
Número total de Afiliações: 14
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 10, n. 1 AUG 10 2020.
Citações Web of Science: 0
Resumo

Thermodynamic arguments imply that global mean rainfall increases in a warmer atmosphere; however, dynamical effects may result in more significant diversity of regional precipitation change. Here we investigate rainfall changes in the mid-Pliocene Warm Period (similar to 3 Ma), a time when temperatures were 2-3 degrees C warmer than the pre-industrial era, using output from the Pliocene Model Intercomparison Projects phases 1 and 2 and sensitivity climate model experiments. In the Mid-Pliocene simulations, the higher rates of warming in the northern hemisphere create an interhemispheric temperature gradient that enhances the southward cross-equatorial energy flux by up to 48%. This intensified energy flux reorganizes the atmospheric circulation leading to a northward shift of the Inter-Tropical Convergence Zone and a weakened and poleward displaced Southern Hemisphere Subtropical Convergences Zones. These changes result in drier-than-normal Southern Hemisphere tropics and subtropics. The evaluation of the mid-Pliocene adds a constraint to possible future warmer scenarios associated with differing rates of warming between hemispheres. (AU)

Processo FAPESP: 16/23670-0 - A circulação do oceano Atlântico Sul e seu setor austral no Plioceno Médio como análogo para o clima do século 21
Beneficiário:Gabriel Marques Pontes
Linha de fomento: Bolsas no Brasil - Doutorado Direto