气候变化领域集成服务门户(CCPortal): Seasonal and annual changes of the regional tropical belt in GPS-RO measurements and reanalysis datasets

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DOI	10.1175/JCLI-D-19-0671.1
	Seasonal and annual changes of the regional tropical belt in GPS-RO measurements and reanalysis datasets
	Luan L.; Staten P.W.; Chi O.A.O.; Qiang F.U.
发表日期	2020
ISSN	0894-8755
起始页码	4083
结束页码	4094
卷号	33 期号:10
英文摘要	The width of the tropical belt has been analyzed with a variety of metrics, often based on zonal-mean data from reanalyses. However, constraining the global and regional tropical width requires both a global spatial-resolving observational dataset and an appropriate metric to take advantage of such data. The tropical tropopause break is arguably such a metric. This study aims to evaluate the performance of different reanalyses and metrics with a focus on depicting regional tropical belt width. We choose four distinct tropopause-break metrics derived from global positioning system radio occultation (GPS-RO) satellite data and four modern reanalyses (ERA-Interim, MERRA-2, JRA-55, and CFSR). We show that reanalyses generally reproduce the regional tropical tropopause break to within 108 of that in GPS-RO data-but that the tropical width is somewhat sensitive (within 48) to how data are averaged zonally, moderately sensitive (within 108) to the dataset resolution, and more sensitive (208 over the Northern Hemisphere Atlantic Ocean during June-August) to the choice of metric. Reanalyses capture the poleward displacement of the tropical tropopause break over land and equatorward displacement over ocean during summertime, and the reverse during the wintertime. Reanalysis-based tropopause breaks are also generally well correlated with those from GPS-RO, although CFSR reproduces 14-yr trends much more closely than others (including ERA-Interim). However, it is hard to say which dataset is the best match of GPS-RO. We further find that the tropical tropopause break is representative of the subtropical jet latitude and the Northern Hemisphere edge of the Hadley circulation in terms of year-to-year variations. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Clouds; Global positioning system; Atlantic Ocean; Hadley circulation; Northern Hemispheres; Radio occultations; Satellite data; Subtropical jet; Tropical belt; Tropical tropopause; Tropics; annual variation; GPS; satellite data; seasonal variation; trend analysis; tropical environment; tropopause
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/171313
作者单位	Department of Earth and Atmospheric Sciences, Indiana University Bloomington, Bloomington, IN, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Luan L.,Staten P.W.,Chi O.A.O.,et al. Seasonal and annual changes of the regional tropical belt in GPS-RO measurements and reanalysis datasets[J],2020,33(10).
APA	Luan L.,Staten P.W.,Chi O.A.O.,&Qiang F.U..(2020).Seasonal and annual changes of the regional tropical belt in GPS-RO measurements and reanalysis datasets.Journal of Climate,33(10).
MLA	Luan L.,et al."Seasonal and annual changes of the regional tropical belt in GPS-RO measurements and reanalysis datasets".Journal of Climate 33.10(2020).