The roles of surface heat flux and ocean heat transport convergence in determining Atlantic Ocean temperature variability
The roles of surface heat flux and ocean heat transport convergence in determining Atlantic Ocean temperature variability
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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
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
G. Madec
中科院分区：
文献类型：
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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
使用涡流允许（1/4°）全球海洋模型（ORCA-025）以及1958年至2001年历史地表气象场来研究大西洋的温度变化。将体积平均温度的模拟和纬向平均温度趋势的垂直结构与观测结果进行比较。在观测数量较多的区域，特别是深度超过 500 m、北纬 22° 至 65° 之间的区域，模型模拟和数据集非常一致。研究了海洋热传输（OHT）收敛和净表面热通量的变化对海洋热含量变化的相对贡献，重点关注三个区域：副极地和副热带环流以及热带。地表热通量在副极地和亚热带地区的逐年变化中起着相对较小的作用，但在热带北大西洋，其作用与海洋热输送辐合具有相似的意义。研究期间最强的信号是1970年至1990年间副极地环流的冷却，随后随着中纬度OHT辐合从异常弱状态转变为异常强状态而发生逆转。我们还通过对大西洋扇区的 Hovmöller 分析，探索 OHT 异常模型是否可以与地表通量异常联系起来。在低纬度地区，海洋热量增加与异常强烈的向北输送相一致，而在中高纬度地区，海洋热量损失的减少与异常微弱的热量输送有关。
The temperature variability of the Atlantic Ocean is investigated using an eddy-permitting (1/4°) global ocean model (ORCA-025) forced with historical surface meteorological fields from 1958 to 2001. The simulation of volume-averaged temperature and the vertical structure of the zonally averaged temperature trends are compared with those from observations. In regions with a high number of observations, in particular above a depth of 500 m and between 22° N and 65° N, the model simulation and the dataset are in good agreement. The relative contribution of variability in ocean heat transport (OHT) convergence and net surface heat flux to changes in ocean heat content is investigated with a focus on three regions: the subpolar and subtropical gyres and the tropics. The surface heat flux plays a relatively minor role in year-to-year changes in the subpolar and subtropical regions, but in the tropical North Atlantic, its role is of similar significance to the ocean heat transport convergence. The strongest signal during the study period is a cooling of the subpolar gyre between 1970 and 1990, which subsequently reversed as the mid-latitude OHT convergence transitioned from an anomalously weak to an anomalously strong state. We also explore whether model OHT anomalies can be linked to surface flux anomalies through a Hovmöller analysis of the Atlantic sector. At low latitudes, increased ocean heat gain coincides with anomalously strong northward transport, whereas at mid-high latitudes, reduced ocean heat loss is associated with anomalously weak heat transport.
中尺度扰动控制非洲南部的海洋间交换
影响因子：
5.2
作者：
Biastoch;J. R. E. Lutjeharms;C. W. Böning;M. Scheinert
通讯作者：
M. Scheinert