Signature of Ocean Warming at the Mixed Layer Base
Signature of Ocean Warming at the Mixed Layer Base
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DOI：
10.1029/2019gl086269
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发表时间：
2020-01-16
影响因子：
5.2
通讯作者：
Nurser, George
中科院分区：
文献类型：
--
作者：
Clement, Louis;McDonagh, Elaine L.;Nurser, George
气候变暖通过改变海洋的风力动力和输入额外的热量来影响海洋。本研究分析温度异常穿透海洋内部的变暖，即以冬季混合层基底为重点。这可以区分海洋环流对暖异常的贡献区域和密度补偿的温度异常沿等平线局部进入海洋的位置。在冬季混合层基础上，研究了来自水文数据集的多年代际（1980-2018）当地温度趋势，并将其划分为与等平线运动（heave）和沿等平线变化（spice）相关的分量。副热带环流和西部边界流的变暖幅度大于全球平均水平，这主要反映在隆起上。这是南半球副热带环流增强的结果，与风致变化和南大洋变暖有关。亚热带地区的地表盐度最大值受沿等压线的暖异常的影响。
The warming climate influences the ocean by changing its wind-driven dynamics and by inputting extra heat. This study analyzes the warming where temperature anomalies penetrate the ocean interior, that is, by focusing on the winter mixed layer base. This allows to distinguish regions where ocean circulation contributes to warm anomalies from locations where density-compensated temperature anomalies locally enter the ocean along isopycnals. Multidecadal (1980-2018) local temperature trends from a hydrographic data set are examined at the winter mixed layer base and partitioned into components relating to isopycnal movement (heave) and change along isopycnals (spice). Subtropical gyres and western boundary currents show warming larger than the global average that mostly projects onto heave. This is the result of the strengthening of the circulation in the Southern Hemisphere subtropical gyres and is related to both wind-driven changes and Southern Ocean warming. Subtropical regions of surface salinity maxima are influenced by warm anomalies along isopycnals.