气候变化领域集成服务门户(CCPortal): Surface pressure and elevation correction from observation and multiple reanalyses over the Tibetan Plateau

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DOI	10.1007/s00382-019-04905-y
	Surface pressure and elevation correction from observation and multiple reanalyses over the Tibetan Plateau
	You Q.; Bao Y.; Jiang Z.; Pepin N.; Moore G.W.K.
发表日期	2019
ISSN	0930-7575
起始页码	5893
结束页码	5908
卷号	53 期号:2020-09-10
英文摘要	Surface pressure reflects the deep structure of the overlying atmosphere, and is recognized as an indicator of climate change. In this study, observed surface pressure at 71 stations over the Tibetan Plateau (TP) during 1979–2013 is analyzed and compared with monthly means from multiple reanalyses (NCEP1, NCEP2, ERA-Interim, MERRA and JRA55). During the studied period, surface pressure from both observations and the reanalyses increases slowly up until the mid-2000s but shows a decrease afterwards, leading to a recent fall in pressure. However, the surface pressure over the TP in spring has increased, probably explained by the thermal condition such as diabatic heating change. Observations and the multiple reanalyses are positively correlated at most locations indicating that reanalyses reproduce the interannual variation and long-term trend of observed surface pressure fairly well. Despite high inter-annual correlation, trend magnitudes over 1979–2013 are varied, with observations showing decreased pressure at most stations, but reanalyses showing increases in many cases. Compared with observations however, surface pressures from all reanalyses are underestimated usually by about 3–6%. There are significant positive correlations between surface pressure bias and elevation bias, suggesting that overestimation of elevation partially explains the surface pressure bias. A topographical correction method using the hydrostatic equation is therefore conducted and more than 90% of the biases of the reanalyses can be eliminated. Overall, this study points to the importance of better analyzing the importance of topography in the western TP to enhance understanding of reanalysis uncertainties in this region. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Multiple reanalyses; Surface pressure; Tibetan Plateau; Trend
语种	英语
scopus关键词	annual variation; correction; correlation; elevation; hydrostatics; surface pressure; topography; trend analysis; China; Qinghai-Xizang Plateau
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145890
作者单位	Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, 200438, China; Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Nanjing University of Information Science and Technology (NUIST), Nanjing, 210044, China; Department of Geography, University of Portsmouth, Portsmouth, PO1 3HE, United Kingdom; Department of Physics, University of Toronto, Toronto, ON, Canada
推荐引用方式 GB/T 7714	You Q.,Bao Y.,Jiang Z.,et al. Surface pressure and elevation correction from observation and multiple reanalyses over the Tibetan Plateau[J],2019,53(2020-09-10).
APA	You Q.,Bao Y.,Jiang Z.,Pepin N.,&Moore G.W.K..(2019).Surface pressure and elevation correction from observation and multiple reanalyses over the Tibetan Plateau.Climate Dynamics,53(2020-09-10).
MLA	You Q.,et al."Surface pressure and elevation correction from observation and multiple reanalyses over the Tibetan Plateau".Climate Dynamics 53.2020-09-10(2019).