Observed Relative Contributions of Anomalous Heat Fluxes and Effective Heat Capacity to Sea Surface Temperature Variability
Observed Relative Contributions of Anomalous Heat Fluxes and Effective Heat Capacity to Sea Surface Temperature Variability
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DOI：
10.1029/2023gl103165
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发表时间：
2023-08
影响因子：
5.2
通讯作者：
N. Takahashi;K. Richards;N. Schneider;M. Stuecker;H. Annamalai;M. Nonaka
中科院分区：
文献类型：
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作者：
N. Takahashi;K. Richards;N. Schneider;M. Stuecker;H. Annamalai;M. Nonaka
海洋表面温度（SST）的变化不仅是由于海气界面的热交换，而且还由于主要由混合层深度（MLD）决定的有效热容的变化。在这里，我们使用观测数据集研究MLD异常对SST月间变化的贡献的季节和区域特征。首先，我们提出了一个称为通量散度角的度量，它可以量化地面热通量和MLD异常对SST变率的相对贡献。使用这个度量，我们发现，MLD异常往往放大SST异常在温带，特别是在东部海洋盆地，在春季和夏季。相反，MLD异常倾向于在12月至1月至2月期间压制热带太平洋东部的SST异常。本文提供了第一个全球图片的MLD异常的观察到的重要性，当地的SST变率。
Sea surface temperatures (SSTs) vary not only due to heat exchange across the air‐sea interface but also due to changes in effective heat capacity as primarily determined by mixed layer depth (MLD). Here, we investigate seasonal and regional characteristics of the contribution of MLD anomalies to the month‐to‐month variability of SST using observational datasets. First, we propose a metric called Flux Divergence Angle, which can quantify the relative contributions of surface heat fluxes and MLD anomalies to SST variability. Using this metric, we find that MLD anomalies tend to amplify SST anomalies in the extra‐tropics, especially in the eastern ocean basins, during spring and summer. In contrast, MLD anomalies tend to suppress SST anomalies in the eastern tropical Pacific during December‐January‐February. This paper provides the first global picture of the observed importance of MLD anomalies to the local SST variability.