Response of Southern Ocean Ventilation to Changes in Midlatitude Westerly Winds
Response of Southern Ocean Ventilation to Changes in Midlatitude Westerly Winds
复制标题
南大洋通风对中纬度西风变化的响应
DOI：
10.1175/jcli-d-19-0039.1
复制
发表时间：
2019
影响因子：
4.9
通讯作者：
T. Haine
中科院分区：
文献类型：
--
作者：
D. Waugh;A. Hogg;P. Spence;M. England;T. Haine
在南半球的海洋通风的变化，在中纬度西风的变化进行检查，通过分析理想的年龄示踪剂从全球涡旋允许的海洋-冰模型模拟，其中有一个突然增加和/或纬向风的转变。在模式和中间沃茨的年龄响应被认为是接近线性的响应的峰值风的组合增加和移动的总和是类似的个人响应的增加和移动。此外，正压响应，Sverdrup平衡后，可以解释风应力的变化的年龄响应。在风应力增加40%或向极移2.5°的理想年龄，也有类似的峰值下降（约50年）。然而，虽然整个温跃层的年龄随着风的增加而减少，但随着风的向极移动，温跃层北部的年龄增加，只有35°S以南的年龄减少。因此，年轻水的体积变化不同，年龄小于50岁的水的体积增加15%，风增加40%，但基本上没有变化，这一体积为2.5°的转变。由于通风在碳和热的吸收中起着至关重要的作用，这些结果表明，在模式和中间沃茨中的人为碳和热的储存可能会随着风的加强而增加，但对峰值风应力的纬向变化不太敏感。
Changes in ventilation of the Southern Hemisphere oceans in response to changes in midlatitude westerly winds are examined by analyzing the ideal age tracer from global eddy-permitting ocean–ice model simulations in which there is an abrupt increase and/or a meridional shift in the winds. The age response in mode and intermediate waters is found to be close to linear; the response of a combined increase and shift of peak winds is similar to the sum of the individual responses to an increase and a shift. Further, a barotropic response, following Sverdrup balance, can explain much of the age response to the changes in wind stress. There are similar peak decreases (of around 50 years) in the ideal age for a 40% increase or 2.5° poleward shift in the wind stress. However, while the age decreases throughout the thermocline for an increase in the winds, for a poleward shift in the winds the age increases in the north part of the thermocline and there are decreases in age only south of 35°S. As a consequence, the change in the volume of young water differs, with a 15% increase in the volume of water with ages younger than 50 years for a 40% increase in the winds but essentially no change in this volume for a 2.5° shift. As ventilation plays a critical role in the uptake of carbon and heat, these results suggest that the storage of anthropogenic carbon and heat in mode and intermediate waters will likely increase with a strengthening of the winds, but will be much less sensitive to a meridional shift in the peak wind stress.
影响因子：
4.4
作者：
Bracegirdle, Thomas J.;Shuckburgh, Emily;Wilcox, Laura J.
通讯作者：
Wilcox, Laura J.