期刊
DYNAMICS OF ATMOSPHERES AND OCEANS
卷 51, 期 3, 页码 77-93出版社
ELSEVIER
DOI: 10.1016/j.dynatmoce.2011.03.002
关键词
Indian Ocean; Thermocline ridge; Mixed layer budgets
资金
- NASA
- PO.DAAC (http://podaac.jpl.nasa.gov)
We use a heat-and salt-conserving ocean state estimation product to study the seasonal cycles of the mixed layer (ML) temperature (MLT) and salinity (MIS) balances over the southwestern tropical Indian Ocean (SWTIO) thermocline ridge (STR; 50 degrees-75 degrees E, 12 degrees-5 degrees S). For seasonal MLT, surface heat flux and ocean processes are both important. They tend to re-enforce each other during peak cooling (May-June) and warming (November) periods, but not during transition periods. The dominant ocean process is wind-driven vertical mixing. It is modulated by the variable strength of the monsoon winds (which affect the vertical diffusivity), and to a lesser extent by variability of thermocline depth (which influences the vertical stratification across the ML base). For example, thermocline shoaling in April-July alters the vertical stratification near the ML base; thus, when the monsoon winds heighten (June-September) and the vertical diffusivity increases (deepening the ML base), relatively cool subsurface water is near the ML base and easily incorporated into the ML by vertical mixing. However, vertical advection as a direct response to thermocline shoaling has little affect on MLT. This explains why MLT and thermocline depth are not positively correlated here on the seasonal timescale (as they are on the interannual timescale). Meridional advection associated with Ekman transport driven by the monsoon winds plays a secondary role. Seasonal MLS, however, is dominated by meridional advection. Vertical process effects on MLS are small, due to a weak salinity gradient near the ML base throughout the year. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据