DOI: 10.1175/JCLI-D-18-0184.1
Scopus记录号: 2-s2.0-85053063747
论文题名: Distinct mechanisms of decadal subsurface heat content variations in the eastern and western Indian Ocean modulated by tropical Pacific SST
作者: Jin X. ; Kwon Y.-O. ; Ummenhofer C.C. ; Seo H. ; Kosaka Y. ; Wright J.S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 7751
结束页码: 7769
语种: 英语
英文关键词: Air-sea interaction
Scopus关键词: Climate models
; Enthalpy
; Mechanical waves
; Surface waters
; Tropics
; Wind effects
; Air sea interactions
; Coupled climate model
; Eastern tropical pacific
; Indonesian throughflow
; Sea surface temperature (SST)
; Surface wind anomalies
; Tropical Indian ocean
; Western indian oceans
; Ocean currents
英文摘要: Decadal variability of the subsurface ocean heat content (OHC) in the Indian Ocean is investigated using a coupled climate model experiment, in which observed eastern tropical Pacific sea surface temperature (EPSST) anomalies are specified. This study intends to understand the contributions of external forcing relative to those of internal variability associated with EPSST, as well as the mechanisms by which the Pacific impacts Indian Ocean OHC. Internally generated variations associated with EPSST dominate decadal variations in the subsurface Indian Ocean. Consistent with ocean reanalyses, the coupled model reproduces a pronounced east-west dipole structure in the southern tropical Indian Ocean and discontinuities in westward-propagating signals in the central Indian Ocean around 100°E. This implies distinct mechanisms by which the Pacific impacts the eastern and western Indian Ocean on decadal time scales. Decadal variations of OHC in the eastern Indian Ocean are attributed to 1) western Pacific surface wind anomalies, which trigger oceanic Rossby waves propagating westward through the Indonesian Seas and influence Indonesian Throughflow transport, and 2) zonal wind anomalies over the central tropical Indian Ocean, which trigger eastward-propagating Kelvin waves. Decadal variations of OHC in the western Indian Ocean are linked to conditions in the Pacific via changes in the atmospheric Walker cell, which trigger anomalous wind stress curl and Ekman pumping in the central tropical Indian Ocean. Westward-propagating oceanic Rossby waves extend the influence of this anomalous Ekman pumping to the western Indian Ocean. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110658
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 Earth System Science, Tsinghua University, Beijing, China; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Jin X.,Kwon Y.-O.,Ummenhofer C.C.,et al. Distinct mechanisms of decadal subsurface heat content variations in the eastern and western Indian Ocean modulated by tropical Pacific SST[J]. Journal of Climate,2018-01-01,31(19)