DOI: 10.1007/s00382-017-3892-6
Scopus记录号: 2-s2.0-85028985112
论文题名: Time evolution of atmospheric parameters and their influence on sea level pressure over the head Bay of Bengal
作者: Patra A. ; Bhaskaran P.K. ; Jose F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 4583
结束页码: 4598
语种: 英语
英文关键词: Air pressure
; Atmosphere
; Bay of Bengal
; Climate
; Ocean
; Sea level pressure
Scopus关键词: atmospheric dynamics
; atmospheric pressure
; bay
; geopotential
; sea level pressure
; temporal evolution
; wave height
; wind field
; wind velocity
; zonal wind
; Bay of Bengal
; Indian Ocean
英文摘要: A zonal dipole in the observed trends of wind speed and significant wave height over the Head Bay of Bengal region was recently reported in the literature attributed due to the variations in sea level pressure (SLP). The SLP in turn is governed by prevailing atmospheric conditions such as local temperature, humidity, rainfall, atmospheric pressure, wind field distribution, formation of tropical cyclones, etc. The present study attempts to investigate the inter-annual variability of atmospheric parameters and its role on the observed zonal dipole trend in sea level pressure, surface wind speed and significant wave height. It reports on the aspects related to linear trend as well as its spatial variability for several atmospheric parameters: air temperature, geopotential height, omega (vertical velocity), and zonal wind, over the head Bay of Bengal, by analyzing National Centers for Environmental Prediction (NCEP) Reanalysis 2 dataset covering a period of 38 years (1979–2016). Significant warming from sea level to 200 mb pressure level and thereafter cooling above has been noticed during all the seasons. Warming within the troposphere exhibits spatial difference between eastern and western side of the domain. This led to fall in lower tropospheric geopotential height and its east–west variability, exhibiting a zonal dipole pattern across the Head Bay. In the upper troposphere, uplift in geopotential height was found as a result of cooling in higher levels (10–100 mb). Variability in omega also substantiated the observed variations in geopotential height. The study also finds weakening in the upper level westerlies and easterlies. Interestingly, a linear trend in lower tropospheric u-wind component also reveals an east–west dipole pattern over the study region. Further, the study corroborates the reported dipole in trends of sea level pressure, wind speed and significant wave height by evaluating the influence of atmospheric variability on these parameters. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109298
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India; Department of Marine and Ecological Sciences, Florida Gulf Coast University, Fort Myers, FL 33965, United States
Recommended Citation:
Patra A.,Bhaskaran P.K.,Jose F.. Time evolution of atmospheric parameters and their influence on sea level pressure over the head Bay of Bengal[J]. Climate Dynamics,2018-01-01,50(2018-11-12)