Upper ocean response to tropical cyclones in northwestern Pacific during 2001—2004 by Argo data
Upper ocean response to tropical cyclones in northwestern Pacific during 2001—2004 by Argo data
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发表时间：
2006
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通讯作者：
Liu Zenghong
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作者：
Liu Zenghong
利用ARGO剖面浮标资料，分析了2001-2004年西北太平洋上层海洋对热带气旋的响应。结果表明，热带气旋通过后，约有55.6%的廓线显示混合层深度加深，范围在0~60m之间，并在气旋通过后5天内变得更加明显。在强湍流混合作用下，77.8%的观测廓线的混合层温度下降，最大降幅为5℃，61.1%的观测廓线的混合层盐度平均下降0.12。估计的地表风速增加了54%，平均增加了30 cm·S-1，与风速呈正相关，相关系数为0.06。MLT变化与风速呈负相关，相关系数为-0.15。降温表现为偏右，尤其是在气旋路径右侧50-150公里的位置，而MLS的变化在气旋路径两侧几乎呈对称分布。MLD在气旋右侧加深较明显，在100-150公里范围内达到最大。气旋通过前MLD的变化与初始MLD呈负相关，相关系数为-0.42。
The response of upper ocean to the tropical cyclones in the northwestern Pacific during 2001—2004 was discussed and analyzed using the data from Argo profiling floats. The results showed that after tropical cyclones passing, about 55.6% of the profiles showed deepening of the mixed layer depth (MLD) with a scope between 0—60m, which became more obvious within five days after the cyclones passing. Induced by strong turbulent mixing, the mixed layer temperature (MLT) at 77.8% of the observed profiles decreased, by 5℃ at the most; the mixed layer salinity (MLS) also decreased by 0.12 on average at 61.1% of the observed profiles. The estimated surface velocity increased at 54% of the observed profiles, with an average increment of 30 cm·s -1, presenting a positive correlation to wind speed, with a correlation coefficient of 0.06. The change of MLT showed a negative correlation to wind speed, with a correlation coefficient of -0.15. The temperature decrease indicated a rightward bias, especially at the location 50—150km to the right of the cyclone tracks; while the change of MLS almost had the symmetrical distribution on the two sides of the tracks. The MLD deepened more distinctly on the right side of the cyclones and reached its climax in the range of 100—150km. The change of MLD was negatively correlated to the initial MLD before cyclones passing, with a correlation coefficient of -0.42.