DOI: 10.1007/s00382-016-3056-0
Scopus记录号: 2-s2.0-84975744524
论文题名: Frontolysis by surface heat flux in the Agulhas Return Current region with a focus on mixed layer processes: observation and a high-resolution CGCM
作者: Ohishi S. ; Tozuka T. ; Komori N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 12 起始页码: 3993
结束页码: 4007
语种: 英语
英文关键词: Agulhas Return Current
; Entrainment velocity
; Frontogenesis/frontolysis
; High-resolution coupled general circulation model
; Mixed layer depth
; Surface heat flux
英文摘要: Detailed mechanisms for frontogenesis/frontolysis of the Agulhas Return Current (ARC) Front, defined as the maximum of the meridional sea surface temperature (SST) gradient at each longitude within the ARC region (40°–50°E, 55°–35°S), are investigated using observational datasets. Due to larger (smaller) latent heat release to the atmosphere on the northern (southern) side of the front, the meridional gradient of surface net heat flux (NHF) is found throughout the year. In austral summer, surface warming is weaker (stronger) on the northern (southern) side, and thus the NHF tends to relax the SST front. The weaker (stronger) surface warming, at the same time, leads to the deeper (shallower) mixed layer on the northern (southern) side. This enhances the frontolysis, because deeper (shallower) mixed layer is less (more) sensitive to surface warming. In austral winter, stronger (weaker) surface cooling on the northern (southern) side contributes to the frontolysis. However, deeper (shallower) mixed layer is induced by stronger (weaker) surface cooling on the northern (southern) side and suppresses the frontolysis, because the deeper (shallower) mixed layer is less (more) sensitive to surface cooling. Therefore, the frontolysis by the NHF becomes stronger (weaker) through the mixed layer processes in austral summer (winter). The cause of the meridional gradient of mixed layer depth is estimated using diagnostic entrainment velocity and the Monin–Obukhov depth. Furthermore, the above mechanisms obtained from the observation are confirmed using outputs from a high-resolution coupled general circulation model. Causes of model biases are also discussed. © 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/53456
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan; Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Ohishi S.,Tozuka T.,Komori N.. Frontolysis by surface heat flux in the Agulhas Return Current region with a focus on mixed layer processes: observation and a high-resolution CGCM[J]. Climate Dynamics,2016-01-01,47(12)