Seasonal cycle of sea surface temperature and mixed layer heat budget in the tropical Pacific Ocean
Seasonal cycle of sea surface temperature and mixed layer heat budget in the tropical Pacific Ocean
复制标题
热带太平洋海面温度和混合层热收支的季节循环
DOI：
10.1029/93gl02374
复制
发表时间：
1993
影响因子：
5.2
通讯作者：
P. Chang
中科院分区：
文献类型：
--
作者：
P. Chang
综合海洋-大气数据集（COADS）的气候数据与热带太平洋XBT观测的气候温度场相结合，用于评估各种海洋和大气过程在混合层温度季节变化中的重要性。分析表明，在赤道外海洋的大部分地区，混合层深，海洋混合弱，SST的季节变化可以归因于混合层接收的净局部加热。然而，在赤道海洋的其他部分，海洋过程被发现在决定SST的季节波动中起着重要作用。特别是在赤道东太平洋，由于混合层较浅，强烈的垂直混合作用显著降低了上层海洋的热惯性，使得SST的响应与地面加热几乎同步。利用Kraus-Turner型卷吸参数化，分析进一步表明平均卷吸速度引起的垂直热通量对混合层热量收支有重要贡献。
Climatological data derived from the Comprehensive Ocean-Atmosphere Data Set (COADS) combined with the climatological temperature fields from XBT observations in the tropical Pacific Ocean are used to assess the importance of various oceanic and atmospheric processes in the seasonal variation of the mixed layer temperature. The analyses indicate that in most areas of the extra-equatorial oceans, where the mixed layer is deep and oceanic mixing is weak, the seasonal change in SSTs can be attributed to the net local heating received by the mixed layer. However, in other parts of the equatorial oceans, oceanic processes are found to play an important role in determining the seasonal fluctuations of the SST. In particular, in the eastern equatorial Pacific Ocean where the mixed layer is shallow, the thermal-inertia of the upper ocean is reduced significantly by the intense vertical mixing so that the response of the SST is nearly in phase with the surface heating. Using the Kraus-Turner type of entrainment parameterization, the analyses further demonstrate that the vertical heat flux induced by the mean entrainment velocity contributes significantly to the mixed layer heat budget.