气候变化领域集成服务门户(CCPortal): Breakdown of the linear relationship between the southern hemisphere hadley cell edge and jet latitude changes in the last glacial maximum

CCPortal

DOI	10.1175/JCLI-D-19-0531.1
	Breakdown of the linear relationship between the southern hemisphere hadley cell edge and jet latitude changes in the last glacial maximum
	Kim S.-Y.; Son S.-W.
发表日期	2020
ISSN	0894-8755
起始页码	5713
结束页码	5725
卷号	33 期号:13
英文摘要	A poleward displacement of the Hadley cell (HC) edge and the eddy-driven jet latitude has been observed in the Southern Hemisphere (SH) during the last few decades. This change is further projected to continue in the future, indicating coherent tropical and extratropical zonal-mean circulation changes from the present climate to a warm climate. Here we show that such a systematic change in the zonal-mean circulation change does not hold in a cold climate. By examining the Last Glacial Maximum (LGM), preindustrial (PI), and extended concentration pathway 4.5 (ECP4.5) scenarios archived for phase 3 of the Paleoclimate Modeling Intercomparison Project (PMIP3) and phase 5 of the Coupled Model Intercomparison Project (CMIP5), it is shown that while the annual-mean SH HC edge systematically shifts poleward from the LGM scenario to the PI scenario and then to the ECP4.5 scenario the annual-mean SH eddy-driven jet latitude does not. All models show a poleward jet shift from the PI scenario to the ECP4.5 scenario, but over one-half of the models exhibit no trend or even an equatorward jet shift from the LGM scenario to the PI scenario. This decoupling between the HC edge and jet latitude changes is most pronounced in SH winter when the Antarctic surface cooling in the LGM scenario is comparable to or larger than the tropical upper-tropospheric cooling. This result indicates that polar amplification could play a crucial role in driving the decoupling of the tropical and midlatitude zonal-mean circulation in the SH in a cold climate. © 2020 American Meteorological Society.
英文关键词	Clouds; Glacial geology; Tropics; Circulation changes; Coupled Model Intercomparison Project; Last Glacial Maximum; Linear relationships; Model inter comparisons; Polar amplifications; Southern Hemisphere; Systematic changes; Climate change; climate modeling; cooling; eddy; Hadley cell; jet stream; Last Glacial Maximum; paleoclimate; Southern Hemisphere; warming; Antarctica
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171266
作者单位	School of the Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
推荐引用方式 GB/T 7714	Kim S.-Y.,Son S.-W.. Breakdown of the linear relationship between the southern hemisphere hadley cell edge and jet latitude changes in the last glacial maximum[J],2020,33(13).
APA	Kim S.-Y.,&Son S.-W..(2020).Breakdown of the linear relationship between the southern hemisphere hadley cell edge and jet latitude changes in the last glacial maximum.Journal of Climate,33(13).
MLA	Kim S.-Y.,et al."Breakdown of the linear relationship between the southern hemisphere hadley cell edge and jet latitude changes in the last glacial maximum".Journal of Climate 33.13(2020).