DOI: 10.1007/s00382-016-3349-3
Scopus记录号: 2-s2.0-84988345506
论文题名: ENSO related SST anomalies and relation with surface heat fluxes over south Pacific and Atlantic
作者: Chatterjee S. ; Nuncio M. ; Satheesan K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-01-02 起始页码: 391
结束页码: 401
语种: 英语
英文关键词: ENSO
; Meridional moisture transport
; Surface heat fluxes
英文摘要: The role of surface heat fluxes in Southern Pacific and Atlantic Ocean SST anomalies associated with El Nino Southern Oscillation (ENSO) is studied using observation and ocean reanalysis products. A prominent dipole structure in SST anomaly is found with a positive (negative) anomaly center over south Pacific (65S–45S, 120W–70W) and negative (positive) one over south Atlantic (50S–30S, 30W–0E) during austral summer (DJF) of El Nino (LaNina). During late austral spring-early summer (OND) of El Nino (LaNina), anomalous northerly (southerly) meridional moisture transport and a positive (negative) sea level pressure anomaly induces a suppressed (enhanced) latent heat flux from the ocean surface over south Pacific. This in turn results in a shallower than normal mixed layer depth which further helps in development of the SST anomaly. Mixed layer thins further due to anomalous shortwave radiation during summer and a well developed SST anomaly evolves. The south Atlantic pole exhibits exactly opposite characteristics at the same time. The contribution from the surface heat fluxes to mixed layer temperature change is found to be dominant over the advective processes over both the basins. Net surface heat fluxes anomaly is also found to be maximum during late austral spring-early summer period, with latent heat flux having a major contribution to it. The anomalous latent heat fluxes between atmosphere and ocean surface play important role in the growth of observed summertime SST anomaly. Sea-surface height also shows similar out-of-phase signatures over the two basins and are well correlated with the ENSO related SST anomalies. It is also observed that the magnitude of ENSO related anomalies over the southern ocean are weaker in LaNina years than in El Nino years, suggesting an intensified tropics-high latitude tele-connection during warm phases of ENSO. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53182
Appears in Collections: 过去全球变化的重建
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作者单位: National Centre for Antarctic and Ocean Research, Vasco da Gama, Goa, India; Cochin University of Science and Technology, Cochin, India
Recommended Citation:
Chatterjee S.,Nuncio M.,Satheesan K.. ENSO related SST anomalies and relation with surface heat fluxes over south Pacific and Atlantic[J]. Climate Dynamics,2017-01-01,49(2017-01-02)