DOI: 10.1007/s00382-015-2721-z
Scopus记录号: 2-s2.0-84984982009
论文题名: Intraseasonal variability of mixed layer depth in the tropical Indian Ocean
作者: Keerthi M.G. ; Lengaigne M. ; Drushka K. ; Vialard J. ; Montegut C.B. ; Pous S. ; Levy M. ; Muraleedharan P.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-07-08 起始页码: 2633
结束页码: 2655
语种: 英语
英文摘要: In this paper, we use an observational dataset built from Argo in situ profiles to describe the main largescale patterns of intraseasonal mixed layer depth (MLD) variations in the Indian Ocean. An eddy permitting (0.25°) regional ocean model that generally agrees well with those observed estimates is then used to investigate the mechanisms that drive MLD intraseasonal variations and to assess their potential impact on the related SST response. During summer, intraseasonal MLD variations in the Bay of Bengal and eastern equatorial Indian Ocean primarily respond to active/break convective phases of the summer monsoon. In the southern Arabian Sea, summer MLD variations are largely driven by seemingly-independent intraseasonal fluctuations of the Findlater jet intensity. During winter, the Madden–Julian Oscillation drives most of the intraseasonal MLD variability in the eastern equatorial Indian Ocean. Large winter MLD signals in northern Arabian Sea can, on the other hand, be related to advection of continental temperature anomalies from the northern end of the basin. In all the aforementioned regions, peak-to-peak MLD variations usually reach 10 m, but can exceed 20 m for the largest events. Buoyancy flux and wind stirring contribute to intraseasonal MLD fluctuations in roughly equal proportions, except for the Northern Arabian Sea in winter, where buoyancy fluxes dominate. A simple slab ocean analysis finally suggests that the impact of these MLD fluctuations on intraseasonal sea surface temperature variability is probably rather weak, because of the compensating effects of thermal capacity and sunlight penetration: a thin mixed-layer is more efficiently warmed at the surface by heat fluxes but loses more solar flux through its lower base. © Springer-Verlag Berlin Heidelberg 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53772
Appears in Collections: 过去全球变化的重建
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作者单位: National Institute of Oceanography, CSIR, Dona Paula, Goa, India; LOCEAN, IPSL, Sorbonne Universités (UPMC Univ Paris 06)-CNRS-IRD-MNHN, Paris, France; Indo‑French Cell for Water Sciences, IISc‑NIO‑IITM–IRD Joint International Laboratory, NIO, Dona Paula, Goa, India; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Laboratoire d’Océanographie Spatiale, IFREMER, Brest, France; Department of Oceanography, University of Cape Town, Cape Town, South Africa
Recommended Citation:
Keerthi M.G.,Lengaigne M.,Drushka K.,et al. Intraseasonal variability of mixed layer depth in the tropical Indian Ocean[J]. Climate Dynamics,2016-01-01,46(2017-07-08)