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DOI | 10.1007/s00382-018-4419-5 |
Sensitivity of subtropical stationary circulations to global warming in climate models: a baroclinic Rossby gyre theory | |
Levine, Xavier J.1; Boos, William R.2,3 | |
2019-04-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:4873-4890 |
文章类型 | Article |
语种 | 英语 |
国家 | Spain; USA |
英文摘要 | Time-mean, zonally asymmetric circulations maintain an intense hydrologic contrast between monsoon regions and subtropical drylands in Earth's present climate. Climate model simulations suggest that this hydrologic contrast will increase in twenty-first-century global warming scenarios, but the response of the zonally asymmetric circulations to global mean temperature is poorly understood. Here we adapt a simple theory for the strength of time-mean, subtropical, zonally asymmetric circulations (hereafter called stationary circulations) and demonstrate its relevance to summer stationary circulation changes in the Northern Hemisphere in an ensemble of comprehensive climate model simulations of global warming. The theory, which is based on the dynamics of a subtropical Rossby gyre that is in Sverdrup balance and has the vertical structure of a first-baroclinic mode, shows that the weakening of stationary ascent with global warming in the multi-model mean can be represented as a compensation between two processes: a lifting of the tropical tropopause and a decrease of the tropospheric zonal temperature gradient, which respectively require strengthening and weakening of vertical mass flux in the Rossby gyre. A large fraction of the intermodel variance in global warming-induced changes in stationary ascent is associated with intermodel variance in zonal tropospheric temperature gradient changes, which we in turn attribute to intermodel variance in zonal sea surface temperature gradient changes. These results show that much of the sensitivity of subtropical hydrologic contrasts to global mean temperature can be understood in terms of a linear vorticity balance and properties of moist adiabats. |
英文关键词 | Stationary circulation Rossby gyre First-baroclinic mode dynamics Climate change CMIP5 archive |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467187600059 |
WOS关键词 | ASIAN SUMMER MONSOON ; TROPICAL CIRCULATION ; HYDROLOGICAL CYCLE ; RELATIVE ROLES ; PRECIPITATION ; RESPONSES ; WALKER ; MECHANISMS ; SOUTH ; CMIP5 |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181929 |
专题 | 气候变化 |
作者单位 | 1.Barcelona Supercomp Ctr, Barcelona, Spain; 2.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 3.Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA USA |
推荐引用方式 GB/T 7714 | Levine, Xavier J.,Boos, William R.. Sensitivity of subtropical stationary circulations to global warming in climate models: a baroclinic Rossby gyre theory[J]. CLIMATE DYNAMICS,2019,52:4873-4890. |
APA | Levine, Xavier J.,&Boos, William R..(2019).Sensitivity of subtropical stationary circulations to global warming in climate models: a baroclinic Rossby gyre theory.CLIMATE DYNAMICS,52,4873-4890. |
MLA | Levine, Xavier J.,et al."Sensitivity of subtropical stationary circulations to global warming in climate models: a baroclinic Rossby gyre theory".CLIMATE DYNAMICS 52(2019):4873-4890. |
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