DOI: 10.1007/s00382-012-1593-8
Scopus记录号: 2-s2.0-84879552737
论文题名: Impact of vertical mixing induced by small vertical scale structures above and within the equatorial thermocline on the tropical Pacific in a CGCM
作者: Sasaki W. ; Richards K.J. ; Luo J.-J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2 起始页码: 443
结束页码: 453
语种: 英语
英文关键词: Coupled general circulation model
; ENSO
; Small vertical scale structures
; Vertical mixing
英文摘要: Oceanic vertical mixing is known to influence the state of the equatorial ocean which affects the climate system, including the amplitude of El Niño/Southern Oscillation (ENSO). Recent measurements of ocean currents at high vertical resolution capture numerous small vertical scale structures (SVSs) within and above the equatorial thermocline that contribute significantly to vertical mixing but which are not sufficiently resolved by coarse resolution ocean models. We investigate the impact of the vertical mixing induced by the SVSs on the mean state and interannual variability in the tropical Pacific by using a coupled general circulation model. The vertical mixing induced by the SVSs is represented as an elevated vertical diffusivity from the surface down to the 20 °C isotherm depth, a proxy for the depth of the thermocline. We investigate different forms for the elevated mixing. It is found that the SVS-induced mixing strongly affect the mean state of the ocean leading to a warming of sea surface temperature (SST) and associated deepening and sharpening of the thermocline in the eastern equatorial Pacific. We find that the SST warming induced by the elevated mixing is further strengthened through the Bjerknes feedback and SST-shortwave flux feedback. We also find a reduction in the number of large amplitude ENSO events and in certain cases an increase in the skewness of ENSO. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54861
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Application Laboratory, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawad-ku, Yokohama, Kanagawa, Japan; International Pacific Research Center/SOEST, University of Hawaii at Manoa, Honolulu, HI, United States; Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, Australia
Recommended Citation:
Sasaki W.,Richards K.J.,Luo J.-J.. Impact of vertical mixing induced by small vertical scale structures above and within the equatorial thermocline on the tropical Pacific in a CGCM[J]. Climate Dynamics,2013-01-01,41(2)