On the subtropical Northeast Pacific mixed layer depth and its influence on the subduction
On the subtropical Northeast Pacific mixed layer depth and its influence on the subduction
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副热带东北太平洋混合层深度及其对俯冲的影响
DOI：
10.1007/s13131-017-1102-3
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发表时间：
2018-03
影响因子：
1.4
通讯作者：
程晨
中科院分区：
文献类型：
--
作者：
夏瑞彬;刘成彦;程晨
利用9个CMIP 5模式对东北副热带太平洋混合层深度（MLD）和俯冲速率进行了气候模拟。通过与观测资料的比较，模型较好地模拟了MLD和俯冲速率的空间分布。MLD的空间分布是不均匀的，在冬末MLD最大值（>140 m）集中在（28°N，135°W）。这种不均匀的MLD模式在MLD极大区南侧形成了一个强的MLD锋面，控制了侧向诱导速率模式，进而决定了俯冲速率的不均匀分布。由于MLD的区域差异，我们将该地区分为两个区域。相对均匀的Ekman抽吸作用对不均匀俯冲空间分布的影响很小，但其值与侧向感应作用的值相近。在南部地区，向北的暖Ekman平流（-1.75 10 - 7 K/s）控制着海洋水平温度平流（-0.85 10 - 7 K/s），阻止了MLD的加深。在集合平均中，海洋平流对MLD的贡献约为-29.0m/月，抵消了海面净热通量的贡献（33.9m/月）。而在北部地区，向南的冷平流加深了MLD（21.4 m/月），与热通量（30.4 m/月）相似。总之，非均匀的海洋水平温度平流对非均匀的MLD型起主导作用。这一新发现表明，上层洋流在冬季MLD和俯冲速率的变化中起着重要的作用。
The present climate simulations of the mixed layer depth (MLD) and the subduction rate in the subtropical Northeast Pacific are investigated based on nine of the CMIP5 models. Compared with the observation data, spatial patterns of the MLD and the subduction rate are well simulated in these models. The spatial pattern of the MLD is nonuniform, with a local maximum MLD (>140 m) region centered at (28°N, 135°W) in late winter. The nonuniform MLD pattern causes a strong MLD front on the south of the MLD maximum region, controls the lateral induction rate pattern, and then decides the nonuniform distribution of the subduction rate. Due to the inter-regional difference of the MLD, we divide this area into two regions. The relatively uniform Ekman pumping has little effect on the nonuniform subduction spatial pattern, though it is nearly equal to the lateral induction in values. In the south region, the northward warm Ekman advection (–1.75×10–7K/s) controls the ocean horizontal temperature advection (–0.85×10–7K/s), and prevents the deepening of the MLD. In the ensemble mean, the contribution of the ocean advection to the MLD is about–29.0 m/month, offsetting the sea surface net heat flux contribution (33.9 m/month). While in the north region, the southward cold advection deepens the MLD (21.4 m/month) as similar as the heat flux (30.4 m/month). In conclusion, the nonuniform MLD pattern is dominated by the nonuniform ocean horizontal temperature advection. This new finding indicates that the upper ocean current play an important role in the variability of the winter MLD and the subduction rate.
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影响因子：
3.5
作者：
Qiu, Bo;Chen, Shuiming
通讯作者：
Chen, Shuiming
DOI：
10.1016/s0422-9894(08)70730-x
发表时间：
1985
期刊：
Elsevier oceanography series
影响因子：
--
作者：
J. Woods
通讯作者：
J. Woods
影响因子：
4.9
作者：
G. Huffman;R. Adler;B. Rudolf;U. Schneider;P. Keehn
通讯作者：
G. Huffman;R. Adler;B. Rudolf;U. Schneider;P. Keehn
影响因子：
3.6
作者：
Dong, Shenfu;Sprintall, Janet;Talley, Lynne
通讯作者：
Talley, Lynne
影响因子：
3.6
作者：
Kara, AB;Rochford, PA;Hurlburt, HE
通讯作者：
Hurlburt, HE