Trends in Latent and Sensible Heat Fluxes over the Southern Ocean  

作　　者：Lejiang Yu Zhanhai Zhang Mingyu Zhou Shiyuan Zhong Donald H.Lenschow Binrui Li Xianqiao Wang Shiming Li Huiding Wu Bo Sun 

机构地区：[1]Applied Hydrometeorological Research Institute,Nanjing University of Information Science&Technology,Nanjing,China [2]Polar Research Institute of China,Shanghai,China [3]National Marine Environment Forecast Center,Beijing,China [4]Michigan State University,East Lansing,USA [5]National Center for Atmospheric Research,Boulder,USA

出　　处：《Atmospheric and Climate Sciences》2012年第2期159-173,共15页大气和气候科学（英文）

基　　金：supported by the National Natural Science Foundation(41175010,40930848 and 41106164);Marine Public Welfare Project(201205007);National Program on Key Basic Research Project of China(2010CB950301);sponsored by the National Science Foundation

摘　　要：In this study, the trends in latent and sensible heat fluxes (LHF and SHF) over the Southern Ocean (oceans south of 35?S) and the contributions of the Antarctic Oscillation (AAO), the Pacific-South America teleconnection patterns (PSA1 and PSA2) and The El Ni?o-Southern Oscillation (ENSO) to these heat fluxes were investigated using the Objectively Analyzed Air-Sea Fluxes (OAFlux) dataset from 1979 to 2008. Significant positive annual trends in LHF occur over the Agulhas Current, the Brazil Current, the oceans in the vicinity of New Zealand and southern Australia, and the eastern Pacific Ocean near between 35?S and 40?S. Significant negative seasonal trends occur in LHF which differ among the four seasons. The spatial pattern and seasonal variation of the trends in SHF over the Southern Ocean are similar to those of LHF. The spatial patterns of the trends in LHF and SHF caused by the AAO, PSA1, PSA2 and Southern Oscillation Index (SOI) indices show a wave-like feature, varying with different seasons, that can be explained by the anomalous meridional wind associated with the four indices. The above four indices account for a small portion of the trend in LHF and SHF. The residual trends in LHF over the Southern Ocean may be explained by a climate shift in the late 1990s for the four seasons. But the residual trends in SHF over the Southern Ocean are not associated with the climate shift.In this study, the trends in latent and sensible heat fluxes (LHF and SHF) over the Southern Ocean (oceans south of 35?S) and the contributions of the Antarctic Oscillation (AAO), the Pacific-South America teleconnection patterns (PSA1 and PSA2) and The El Ni?o-Southern Oscillation (ENSO) to these heat fluxes were investigated using the Objectively Analyzed Air-Sea Fluxes (OAFlux) dataset from 1979 to 2008. Significant positive annual trends in LHF occur over the Agulhas Current, the Brazil Current, the oceans in the vicinity of New Zealand and southern Australia, and the eastern Pacific Ocean near between 35?S and 40?S. Significant negative seasonal trends occur in LHF which differ among the four seasons. The spatial pattern and seasonal variation of the trends in SHF over the Southern Ocean are similar to those of LHF. The spatial patterns of the trends in LHF and SHF caused by the AAO, PSA1, PSA2 and Southern Oscillation Index (SOI) indices show a wave-like feature, varying with different seasons, that can be explained by the anomalous meridional wind associated with the four indices. The above four indices account for a small portion of the trend in LHF and SHF. The residual trends in LHF over the Southern Ocean may be explained by a climate shift in the late 1990s for the four seasons. But the residual trends in SHF over the Southern Ocean are not associated with the climate shift.

关 键 词：Southern Ocean Antarctic Oscillation Pacific-South America Teleconnection El Nino-Southern Oscillation Heat Flux 

分 类 号：P4[天文地球—大气科学及气象学]