DOI: 10.1007/s00382-017-3856-x
Scopus记录号: 2-s2.0-85027834395
论文题名: Numerical simulation of the observed near-surface East India Coastal Current on the continental slope
作者: Mukherjee A. ; Shankar D. ; Chatterjee A. ; Vinayachandran P.N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 3949
结束页码: 3980
语种: 英语
英文关键词: Boundary currents
; Indian Ocean
; Mixed layer
; Nonlinearity
; Rossby and Kelvin waves
Scopus关键词: boundary current
; coastal current
; computer simulation
; continental slope
; Ekman pumping
; Kelvin wave
; linearity
; mixed layer
; numerical model
; oceanic general circulation model
; Rossby wave
; wave propagation
; wind forcing
; India
; Indian Ocean
英文摘要: We simulate the East India Coastal Current (EICC) using two numerical models (resolution 0. 1 ∘× 0. 1 ∘) , an oceanic general circulation model (OGCM) called Modular Ocean Model and a simpler, linear, continuously stratified (LCS) model, and compare the simulated current with observations from moorings equipped with acoustic Doppler current profilers deployed on the continental slope in the western Bay of Bengal (BoB). We also carry out numerical experiments to analyse the processes. Both models simulate well the annual cycle of the EICC, but the performance degrades for the intra-annual and intraseasonal components. In a model-resolution experiment, both models (run at a coarser resolution of 0. 25 ∘× 0. 25 ∘) simulate well the currents in the equatorial Indian Ocean (EIO), but the performance of the high-resolution LCS model as well as the coarse-resolution OGCM, which is good in the EICC regime, degrades in the eastern and northern BoB. An experiment on forcing mechanisms shows that the annual EICC is largely forced by the local alongshore winds in the western BoB and remote forcing due to Ekman pumping over the BoB, but forcing from the EIO has a strong impact on the intra-annual EICC. At intraseasonal periods, local (equatorial) forcing dominates in the south (north) because the Kelvin wave propagates equatorward in the western BoB. A stratification experiment with the LCS model shows that changing the background stratification from EIO to BoB leads to a stronger surface EICC owing to strong coupling of higher order vertical modes with wind forcing for the BoB profiles. These high-order modes, which lead to energy propagating down into the ocean in the form of beams, are important only for the current and do not contribute significantly to the sea level. © 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/109270
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: ESSO-Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India; CSIR-National Institute of Oceanography, Goa, India; Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru, India
Recommended Citation:
Mukherjee A.,Shankar D.,Chatterjee A.,et al. Numerical simulation of the observed near-surface East India Coastal Current on the continental slope[J]. Climate Dynamics,2018-01-01,50(2018-11-12)