气候变化领域集成服务门户(CCPortal): Comparison of equatorial wave activity in the tropical tropopause layer and stratosphere represented in reanalyses

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DOI	10.5194/acp-19-10027-2019
	Comparison of equatorial wave activity in the tropical tropopause layer and stratosphere represented in reanalyses
	Kim Y.-H.; Kiladis G.N.; Albers J.R.; Dias J.; Fujiwara M.; Anstey J.A.; Song I.-S.; Wright C.J.; Kawatani Y.; Lott F.; Yoo C.
发表日期	2019
ISSN	16807316
起始页码	10027
结束页码	10050
卷号	19 期号:15
英文摘要	Equatorial Kelvin and mixed Rossby-gravity (MRG) waves in the tropical tropopause layer and stratosphere represented in recent reanalyses for the period of 1981-2010 are compared in terms of spectral characteristics, spatial structures, long-term variations, and their forcing of the quasi-biennial oscillation (QBO). For both wave types, the spectral distributions are broadly similar among most of the reanalyses, while the peak amplitudes exhibit considerable spread. The longitudinal distributions and spatial patterns of wave perturbations show reasonable agreement between the reanalyses. A few exceptions to the similarity of the spectral shapes and spatial structures among them are also noted. While the interannual variations of wave activity appear to be coherent for both the Kelvin and MRG waves, there is substantial variability in long-term trends among the reanalyses. Most of the reanalyses which assimilate satellite data exhibit large increasing trends in wave variance (-15%-50% increase in 30 years at 100-10hPa), whereas one reanalysis (Japanese 55-year Reanalysis assimilating conventional observations only; JRA-55C) produced without satellite data does not. Several discontinuities are found around 1998 in the time series of the Kelvin and MRG wave variances, which manifest in different ways depending on the reanalysis, and are indicative of impacts of the transition of satellite measurements during that year. The equatorial wave forcing of the QBO, estimated by the Eliassen-Palm (EP) flux divergence, occurs in similar phase-speed ranges in the lower stratosphere among the reanalyses. However, the EP flux and its divergence are found to be dependent on the zonal-mean winds represented in reanalyses, exhibiting different magnitudes, altitudes, and phase-speed ranges of the Kelvin wave forcing between the reanalyses, especially at 20-10hPa. In addition, at around 20hPa, a wave signal which appears only in easterly mean winds with westward phase speeds is found and discussed. © Author(s) 2019.
语种	英语
scopus关键词	comparative study; equatorial wave; longitudinal gradient; Rossby wave; stratosphere; tropical environment; tropopause; Japan
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/144224
作者单位	Severe Storm Research Center, Ewha Womans University, Seoul, South Korea; Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan; Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, BC, Canada; Korea Polar Research Institute, Incheon, South Korea; Centre for Space, Atmospheric and Oceanic Science, University of Bath, Bath, United Kingdom; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure, Paris, France; Department of Climate and Energy Systems Engineering, Ewha Womans University, Seoul, South Korea
推荐引用方式 GB/T 7714	Kim Y.-H.,Kiladis G.N.,Albers J.R.,et al. Comparison of equatorial wave activity in the tropical tropopause layer and stratosphere represented in reanalyses[J],2019,19(15).
APA	Kim Y.-H..,Kiladis G.N..,Albers J.R..,Dias J..,Fujiwara M..,...&Yoo C..(2019).Comparison of equatorial wave activity in the tropical tropopause layer and stratosphere represented in reanalyses.Atmospheric Chemistry and Physics,19(15).
MLA	Kim Y.-H.,et al."Comparison of equatorial wave activity in the tropical tropopause layer and stratosphere represented in reanalyses".Atmospheric Chemistry and Physics 19.15(2019).