| DOI: | 10.1175/JCLI-D-18-0330.1
|
| Scopus记录号: | 2-s2.0-85060530589
|
| 论文题名: | Exploiting the abrupt 4 × CO2 scenario to elucidate tropical expansion mechanisms |
| 作者: | Chemke R.; Polvani L.M.
|
| 刊名: | Journal of Climate
|
| ISSN: | 8948755
|
| 出版年: | 2019
|
| 卷: | 32, 期:3 | | 起始页码: | 859
|
| 结束页码: | 875
|
| 语种: | 英语
|
| 英文关键词: | Atmospheric circulation
; Climate change
; General circulation models
; Hadley circulation
; Meridional overturning circulation
|
| Scopus关键词: | Atmospheric temperature
; Carbon dioxide
; Cells
; Climate change
; Climate models
; Cytology
; Expansion
; Greenhouse gases
; Moisture
; Surface properties
; Tropics
; Atmospheric circulation
; Coupled Model Intercomparison Project
; Different mechanisms
; Expansion mechanism
; General circulation model
; Hadley circulation
; Meridional overturning circulations
; Surface temperatures
; Clouds
|
| 英文摘要: | Future emissions of greenhouse gases into the atmosphere are projected to result in significant circulation changes. One of the most important changes is the widening of the tropical belt, which has great societal impacts. Several mechanisms (changes in surface temperature, eddy phase speed, tropopause height, and static stability) have been proposed to explain this widening. However, the coupling between these mechanisms has precluded elucidating their relative importance. Here, the abrupt quadrupled-CO2 simulations of phase 5 of the Coupled Model Intercomparison Project (CMIP5) are used to examine the proposed mechanisms. The different time responses of the different mechanisms allow us to disentangle and evaluate them. As suggested by earlier studies, the Hadley cell edge is found to be linked to changes in subtropical baroclinicity. In particular, its poleward shift is accompanied by an increase in subtropical static stability (i.e., a decrease in temperature lapse rate) with increased CO2 concentrations. These subtropical changes also affect the eddy momentum flux, which shifts poleward together with the Hadley cell edge. Transient changes in tropopause height, eddy phase speed, and surface temperature, however, were found not to accompany the poleward shift of the Hadley cell edge. The widening of the Hadley cell, together with the increase in moisture content, accounts for most of the expansion of the dry zone. Eddy moisture fluxes, on the other hand, are found to play a minor role in the expansion of the dry zone. © 2019 American Meteorological Society. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/117232
|
| Appears in Collections: | 气候变化与战略
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Chemke R.,Polvani L.M.. Exploiting the abrupt 4 × CO2 scenario to elucidate tropical expansion mechanisms[J]. Journal of Climate,2019-01-01,32(3)
|
|
|