气候变化领域集成服务门户(CCPortal): Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric

CCPortal

DOI	10.1175/JCLI-D-19-0629.1
	Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric
	Martin E.R.; Homeyer C.R.; McKinzie R.A.; McCarthy K.M.; Xian T.
发表日期	2020
ISSN	0894-8755
起始页码	5885
结束页码	5903
卷号	33 期号:14
英文摘要	Changes in tropical width can have important consequences in sectors including ecosystems, agriculture, and health. Observations suggest tropical expansion over the past 30 years although studies have not agreed on the magnitude of this change. Climate model projections have also indicated an expansion and show similar uncertainty in its magnitude. This study utilizes an objective, longitudinally varying, tropopause break method to define the extent of the tropics at upper levels. The location of the tropopause break is associated with enhanced stratosphere-troposphere exchange and thus its structure influences the chemical composition of the stratosphere. The method shows regional variations in the width of the upper-level tropics in the past and future. Four modern reanalyses show significant contraction of the tropics over the eastern Pacific between 1981 and 2015, and slight but significant expansion in other regions. The east Pacific narrowing contributes to zonal mean narrowing, contradicting prior work, and is attributed to the use of monthly and zonal mean data in prior studies. Six global climate models perform well in representing the climatological location of the tropical boundary. Future projections show a spread in the width trend (from ;0.58 decade21 of narrowing to ;0.48 decade21 of widening), with a narrowing projected across the east Pacific and Northern Hemisphere Americas. This study illustrates that this objective tropopause break method that uses instantaneous data and does not require zonal averaging is appropriate for identifying upper-level tropical width trends and the break location is connected with local and regional changes in precipitation. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Agricultural robots; Clouds; Location; Tropics; Chemical compositions; East Pacific; Eastern pacific; Future projections; Global climate model; Northern Hemispheres; Regional variation; Stratosphere-troposphere exchange; Climate models; climate modeling; CMIP; magnitude; precipitation (climatology); regional pattern; stratosphere-troposphere interaction; tropical environment; tropopause; Pacific Ocean; Pacific Ocean (East)
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/171223
作者单位	School of Meteorology, University of Oklahoma and South Central Climate Adaptation Science Center, Norman, OK, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States
推荐引用方式 GB/T 7714	Martin E.R.,Homeyer C.R.,McKinzie R.A.,et al. Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric[J],2020,33(14).
APA	Martin E.R.,Homeyer C.R.,McKinzie R.A.,McCarthy K.M.,&Xian T..(2020).Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric.Journal of Climate,33(14).
MLA	Martin E.R.,et al."Regionally Varying Assessments of Upper-Level Tropical Width in Reanalyses and CMIP5 Models Using a Tropopause Break Metric".Journal of Climate 33.14(2020).