Origins of Eddy Kinetic Energy in the Bay of Bengal
By analyzing satellite observational data and ocean general circulation model experiments, this study investigates the key processes that determine the spatial distribution and seasonality of intraseasonal eddy kinetic energy (EKE) within the Bay of Bengal (BOB). It is revealed that a complicated me...
Published in: | Journal of Geophysical Research: Oceans |
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/38093 2023-05-15T17:35:09+02:00 Origins of Eddy Kinetic Energy in the Bay of Bengal Chen, Gengxin Li, Yuanlong Xie, Qiang Wang, Dongxiao 2018-03-01 http://ir.gig.ac.cn/handle/344008/38093 https://doi.org/10.1002/2017JC013455 英语 eng AMER GEOPHYSICAL UNION JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.gig.ac.cn/handle/344008/38093 doi:10.1002/2017JC013455 Oceanography eddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal EQUATORIAL INDIAN-OCEAN PACIFIC SUBTROPICAL COUNTERCURRENT SEA-SURFACE HEIGHT INTRASEASONAL VARIABILITY INTERANNUAL VARIABILITY COASTAL CURRENT SALINITY STRATIFICATION TROPICAL PACIFIC SST VARIABILITY NORTH-ATLANTIC 期刊论文 2018 ftchacadscgigcas https://doi.org/10.1002/2017JC013455 2020-12-22T07:21:24Z By analyzing satellite observational data and ocean general circulation model experiments, this study investigates the key processes that determine the spatial distribution and seasonality of intraseasonal eddy kinetic energy (EKE) within the Bay of Bengal (BOB). It is revealed that a complicated mechanism involving both local and remote wind forcing and ocean internal instability is responsible for the generation and modulation of EKE in this region. High-level EKE mainly resides in four regions: east of Sri Lanka (Region 1), the western BOB (Region 2), northwest of Sumatra (Region 3), and the coastal rim of the BOB (Region 4). The high EKE levels in Regions 1 and 2 are predominantly produced by ocean internal instability, which contributes 90% and 79%, respectively. Prominent seasonality is also observed in these two regions, with higher EKE levels in boreal spring and fall due to enhanced instability of the East Indian Coast Current and the Southwest Monsoon Current, respectively. In contrast, ocean internal instability contributes 49% and 52% of the total EKE in Regions 3 and 4, respectively, whereas the atmospheric forcing of intraseasonal oscillations (ISOs) also plays an important role. ISOs produce EKE mainly through wind stress, involving both the remote effect of equatorial winds and the local effect of monsoonal winds. Equatorial-origin wave signals significantly enhance the EKE levels in Regions 3 and 4, in the form of reflected Rossby waves and coastal Kelvin waves, respectively. The local wind forcing effect through Ekman pumping also has a significant contribution in Regions 3 and 4 (24% and 22%, respectively). Report North Atlantic Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Indian Pacific Journal of Geophysical Research: Oceans 123 3 2097 2115 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Oceanography eddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal EQUATORIAL INDIAN-OCEAN PACIFIC SUBTROPICAL COUNTERCURRENT SEA-SURFACE HEIGHT INTRASEASONAL VARIABILITY INTERANNUAL VARIABILITY COASTAL CURRENT SALINITY STRATIFICATION TROPICAL PACIFIC SST VARIABILITY NORTH-ATLANTIC |
spellingShingle |
Oceanography eddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal EQUATORIAL INDIAN-OCEAN PACIFIC SUBTROPICAL COUNTERCURRENT SEA-SURFACE HEIGHT INTRASEASONAL VARIABILITY INTERANNUAL VARIABILITY COASTAL CURRENT SALINITY STRATIFICATION TROPICAL PACIFIC SST VARIABILITY NORTH-ATLANTIC Chen, Gengxin Li, Yuanlong Xie, Qiang Wang, Dongxiao Origins of Eddy Kinetic Energy in the Bay of Bengal |
topic_facet |
Oceanography eddy kinetic energy ocean internal instability remote equatorial wind local wind Bay of Bengal EQUATORIAL INDIAN-OCEAN PACIFIC SUBTROPICAL COUNTERCURRENT SEA-SURFACE HEIGHT INTRASEASONAL VARIABILITY INTERANNUAL VARIABILITY COASTAL CURRENT SALINITY STRATIFICATION TROPICAL PACIFIC SST VARIABILITY NORTH-ATLANTIC |
description |
By analyzing satellite observational data and ocean general circulation model experiments, this study investigates the key processes that determine the spatial distribution and seasonality of intraseasonal eddy kinetic energy (EKE) within the Bay of Bengal (BOB). It is revealed that a complicated mechanism involving both local and remote wind forcing and ocean internal instability is responsible for the generation and modulation of EKE in this region. High-level EKE mainly resides in four regions: east of Sri Lanka (Region 1), the western BOB (Region 2), northwest of Sumatra (Region 3), and the coastal rim of the BOB (Region 4). The high EKE levels in Regions 1 and 2 are predominantly produced by ocean internal instability, which contributes 90% and 79%, respectively. Prominent seasonality is also observed in these two regions, with higher EKE levels in boreal spring and fall due to enhanced instability of the East Indian Coast Current and the Southwest Monsoon Current, respectively. In contrast, ocean internal instability contributes 49% and 52% of the total EKE in Regions 3 and 4, respectively, whereas the atmospheric forcing of intraseasonal oscillations (ISOs) also plays an important role. ISOs produce EKE mainly through wind stress, involving both the remote effect of equatorial winds and the local effect of monsoonal winds. Equatorial-origin wave signals significantly enhance the EKE levels in Regions 3 and 4, in the form of reflected Rossby waves and coastal Kelvin waves, respectively. The local wind forcing effect through Ekman pumping also has a significant contribution in Regions 3 and 4 (24% and 22%, respectively). |
format |
Report |
author |
Chen, Gengxin Li, Yuanlong Xie, Qiang Wang, Dongxiao |
author_facet |
Chen, Gengxin Li, Yuanlong Xie, Qiang Wang, Dongxiao |
author_sort |
Chen, Gengxin |
title |
Origins of Eddy Kinetic Energy in the Bay of Bengal |
title_short |
Origins of Eddy Kinetic Energy in the Bay of Bengal |
title_full |
Origins of Eddy Kinetic Energy in the Bay of Bengal |
title_fullStr |
Origins of Eddy Kinetic Energy in the Bay of Bengal |
title_full_unstemmed |
Origins of Eddy Kinetic Energy in the Bay of Bengal |
title_sort |
origins of eddy kinetic energy in the bay of bengal |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2018 |
url |
http://ir.gig.ac.cn/handle/344008/38093 https://doi.org/10.1002/2017JC013455 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS http://ir.gig.ac.cn/handle/344008/38093 doi:10.1002/2017JC013455 |
op_doi |
https://doi.org/10.1002/2017JC013455 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
3 |
container_start_page |
2097 |
op_container_end_page |
2115 |
_version_ |
1766134211398336512 |