气候变化领域集成服务门户(CCPortal): Implication of tropical lower stratospheric cooling in recent trends in tropical circulation and deep convective activity

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DOI	10.5194/acp-19-2655-2019
	Implication of tropical lower stratospheric cooling in recent trends in tropical circulation and deep convective activity
	Kodera K.; Eguchi N.; Ueyama R.; Kuroda Y.; Kobayashi C.; Funatsu B.; Claud C.
发表日期	2019
ISSN	16807316
起始页码	2655
结束页码	2669
卷号	19 期号:4
英文摘要	Large changes in tropical circulation from the mid-to-late 1990s to the present, in particular changes related to the summer monsoon and cooling of the sea surface in the equatorial eastern Pacific, are noted. The cause of such recent decadal variations in the tropics was studied using a meteorological reanalysis dataset. Cooling of the equatorial southeastern Pacific Ocean occurred in association with enhanced cross-equatorial southerlies that were associated with a strengthening of the deep ascending branch of the boreal summer Hadley circulation over the continental sector connected to stratospheric circulation. From boreal summer to winter, the anomalous convective activity center moves southward following the seasonal march to the equatorial Indian Ocean-Maritime Continent region, which strengthens the surface easterlies over the equatorial central Pacific. Accordingly, ocean surface cooling extends over the equatorial central Pacific. We suggest that the fundamental cause of the recent decadal change in the tropical troposphere and the ocean is a poleward shift of convective activity that resulted from a strengthening of extreme deep convection penetrating into the tropical tropopause layer, particularly over the African and Asian continents and adjacent oceans. We conjecture that the increase in extreme deep convection is produced by a combination of land surface warming due to increased CO2 and a reduction of static stability in the tropical tropopause layer due to tropical stratospheric cooling. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	atmospheric circulation; convection; cooling; sea surface temperature; stratosphere; summer; trend analysis; tropical environment; Pacific Ocean; Pacific Ocean (Equatorial)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144608
作者单位	Climate Research Department, Meteorological Research Institute, Tsukuba, 305-0052, Japan; Research Institute for Applied Mechanics, Kyushu University, Kasuga, 816-8580, Japan; Earth Science Division, Atmospheric Science Branch, NASA Ames Research Center, Moffett FieldCA 94035-0001, United States; Meteorological College, Japan Meteorological Agency, Kashiwa, 277-0852, Japan; CNRS, Universite de Nantes, UMR 6554 LETG, Campus du Tertre, Nantes, 44312, France; Laboratoire de Meteorologie Dynamique, Ecole Polytechnique, Palaiseau, 91128, France
推荐引用方式 GB/T 7714	Kodera K.,Eguchi N.,Ueyama R.,et al. Implication of tropical lower stratospheric cooling in recent trends in tropical circulation and deep convective activity[J],2019,19(4).
APA	Kodera K..,Eguchi N..,Ueyama R..,Kuroda Y..,Kobayashi C..,...&Claud C..(2019).Implication of tropical lower stratospheric cooling in recent trends in tropical circulation and deep convective activity.Atmospheric Chemistry and Physics,19(4).
MLA	Kodera K.,et al."Implication of tropical lower stratospheric cooling in recent trends in tropical circulation and deep convective activity".Atmospheric Chemistry and Physics 19.4(2019).