气候变化领域集成服务门户(CCPortal): Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses

CCPortal

DOI	10.5194/acp-20-9115-2020
	Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses
	Kawatani Y.; Hirooka T.; Hamilton K.; K. Smith A.; Fujiwara M.
发表日期	2020
ISSN	16807316
起始页码	9115
结束页码	9133
卷号	20 期号:14
英文摘要	This paper reports on a project to compare the representation of the semiannual oscillation (SAO) in the equatorial stratosphere and lower mesosphere within six major global atmospheric reanalysis datasets and with recent satellite Sounding of the Atmosphere Using Broadband Emission Radiometry (SABER) and Microwave Limb Sounder (MLS) observations. All reanalyses have a good representation of the quasi-biennial oscillation (QBO) in the equatorial lower and middle stratosphere and each displays a clear SAO centered near the stratopause. However, the differences among reanalyses are much more substantial in the SAO region than in the QBO-dominated region. The degree of disagreement among the reanalyses is characterized by the standard deviation (SD) of the monthly mean zonal wind and temperature; this depends on latitude, longitude, height, and time. The zonal wind SD displays a prominent equatorial maximum that increases with height, while the temperature SD reaches a minimum near the Equator and is largest in the polar regions. Along the Equator, the zonal wind SD is smallest around the longitude of Singapore, where consistently high-quality near-equatorial radiosonde observations are available. Interestingly, the near-Singapore minimum in SD is evident to at least 3 hPa, i.e., considerably higher than the usual 10 hPa ceiling for in situ radiosonde observations. Our measurement of the agreement among the reanalyses shows systematic improvement over the period considered (1980-2016), up to near the stratopause. Characteristics of the SAO at 1 hPa, such as its detailed time variation and the displacement off the Equator of the zonal wind SAO amplitude maximum, differ significantly among the reanalyses. Disagreement among the reanalyses becomes still greater above 1 hPa. One of the reanalyses in our study also has a version produced without assimilating satellite observations, and a comparison of the SAO in these two versions demonstrates the very great importance of satellite-derived temperatures in the realistic analysis of the tropical upper stratospheric circulation. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	air temperature; annual variation; data assimilation; microwave limb sounder; quasi-biennial oscillation; satellite data; stratosphere
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/143933
作者单位	Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan; Faculty of Science, Kyushu University, Fukuoka, 819-0395, Japan; International Pacific Research Center, University of Hawaii, Honolulu, HI 96822, United States; Department of Atmospheric Sciences, University of Hawaii, Honolulu, HI 96822, United States; National Center for Atmospheric Research, Boulder, CO 80307, United States; Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
推荐引用方式 GB/T 7714	Kawatani Y.,Hirooka T.,Hamilton K.,et al. Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses[J],2020,20(14).
APA	Kawatani Y.,Hirooka T.,Hamilton K.,K. Smith A.,&Fujiwara M..(2020).Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses.Atmospheric Chemistry and Physics,20(14).
MLA	Kawatani Y.,et al."Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses".Atmospheric Chemistry and Physics 20.14(2020).