Mechanisms of Heat Content and Thermocline Change in the Subtropical and Subpolar North Atlantic

Mechanisms of Heat Content and Thermocline Change in the Subtropical and Subpolar North Atlantic
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北大西洋副热带和副极地热含量和温跃层变化机制

DOI:
10.1175/jcli-d-15-0097.1
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发表时间:
2015
期刊:
影响因子:
4.9
通讯作者:
Roussenov V
Roussenov V
中科院分区:
地球科学2区
文献类型:
--
作者:
Roussenov V

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在北大西洋,海洋热含量在年际至十年的时间尺度上有明显的环流尺度变化,这与海面温度和温跃层厚度的变化有关;副热带地区往往温暖,温跃层厚,而副极地环流凉爽,温跃层薄,反之亦然。这种气候变率的研究使用半诊断动力学分析的历史温度和盐度数据,从1962年到2011年与理想化的等密度模式实验。在典型的5年的时间尺度上,上层海洋热含量的趋势不是简单地解释了面积平均的大气强迫为每个环流,而是占主导地位的热量收敛与纬向翻转环流。在亚热带地区,最明显的变暖事件与更强的信风驱动的热带热量流入增加有关。在副极地环流,变暖和变冷事件与西部边界密度的变化,拉布拉多海密度增加,导致一个增强的翻转和亚热带热量的流入。因此,上层海洋热含量异常是以不同的方式形成的副热带和副极地环流,不同的组件的纬向翻转环流可能激发的大气强迫的本地印记。
In the North Atlantic, there are pronounced gyre-scale changes in ocean heat content on interannual-to-decadal time scales, which are associated with changes in both sea surface temperature and thermocline thickness; the subtropics are often warm with a thick thermocline when the subpolar gyre is cool with a thin thermocline, and vice versa. This climate variability is investigated using a semidiagnostic dynamical analysis of historical temperature and salinity data from 1962 to 2011 together with idealized isopycnic model experiments. On time scales of typically 5 yr, the tendencies in upper-ocean heat content are not simply explained by the area-averaged atmospheric forcing for each gyre but instead dominated by heat convergences associated with the meridional overturning circulation. In the subtropics, the most pronounced warming events are associated with an increased influx of tropical heat driven by stronger trade winds. In the subpolar gyre, the warming and cooling events are associated with changes in western boundary density, where increasing Labrador Sea density leads to an enhanced overturning and an influx of subtropical heat. Thus, upper-ocean heat content anomalies are formed in a different manner in the subtropical and subpolar gyres, with different components of the meridional overturning circulation probably excited by the local imprint of atmospheric forcing.
北大西洋海洋热异常的年代际演化:埃克曼、翻转和水平输送的影响
DOI: 10.1175/jcli-d-12-00234.1
发表时间: 2014
期刊: Journal of Climate
影响因子: 4.9
作者:
Roussenov V
通讯作者: Roussenov V
表面热通量和海洋热传输收敛在确定大西洋温度变化中的作用
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发表时间: 2010
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作者:
J. P. Grist;S. Josey;R. Marsh;S. Good;A. Coward;B. D. de Cuevas;S. Alderson;A. New;G. Madec
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发表时间: 2003-01-01
影响因子: 2.4
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