Estimating Typhoon-Induced Sea Surface Cooling Based upon Satellite Observations
Estimating Typhoon-Induced Sea Surface Cooling Based upon Satellite Observations
复制标题
根据卫星观测估算台风引起的海面变冷
作者：
Song Dan;Xiang Lulu;Guo Linghui;Li Bo
西北太平洋夏季台风频发，近几十年来，海洋上层对台风的响应引起了人们的广泛关注。本文提出了一种改进的基于网格的最大响应（GMR）方法来估计台风引起的海面冷却（SSC）。当前算法（CA）与原GMR方法的区别主要表现在两个方面：(1)采用台风前5天的平均海表温度（SST）作为参考温度，而不是2天的平均海表温度；(2)将400 km的固定半径修改为7级波弗特风力（~17.1 m/s）半径，确定计算SSC的区域。利用卫星观测得到的MW-IR OISST数据，比较了四种台风（鲇鱼、狮子山、川米和孔雷）不同算法估算的SSC。结果表明，在所有情况下，最大响应方法都接近相似的结果，而其他方法似乎在程度上低估了SSC。在缓慢移动的LionRock案例中，基于网格的方法具有更好的性能，而在连续的台风案例中，Trami和kongray， CA使用候平均海温作为参考温度，在表示台风kongray之前的预先海面状态方面表现出更好的结果。此外，使用7级风力覆盖使结果更加生动。总之，本文提出的算法在一般情况下是有效的。该方法在估算慢移台风和连续台风所引起的南海温方面都具有优势，值得进一步应用于相关研究。
Typhoons frequently occur in the summer in the northwestern Pacific Ocean, and the responses of the upper ocean to typhoons have drawn extensive attention for decades. In the present work, a modified grid-based maximum response (GMR) method was proposed to estimate the sea surface cooling (SSC) caused by typhoons. The current algorithm (CA) is different from the original GMR method mainly in two aspects: (1) it uses a 5 day average rather than a 2 day average of the sea surface temperature (SST) before the typhoon as the reference temperature; (2) it modifies the fixed radius of 400 km to the level-7 Beaufort scale wind-force (~17.1 m/s) radius to determine the area where the SSC should be calculated. Then the MW-IR OISST data derived from satellite observations were used to compare the SSC estimated by different algorithms in four typhoon cases, Megi, LionRock, Trami and KongRey. The results show that, in all cases, maximum response methods have approached similar results, while the others seemed to have underestimated the SSC in degrees. In the slow-moving LionRock case, grid-based methods were found to have better performance, while in the successive typhoon cases, Trami and KongRey, CA showed an improved result in representing the pre-existing sea surface status before the typhoon KongRey by using the pentad mean SST as the reference temperature. In addition, the use of level-7 wind-force coverage made the results much livelier. In a word, the algorithm proposed here is valid in general. It has advantages in estimating the SSC caused by both slow-moving typhoons and successive typhoons, and should be further applied to related research.
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DOI：
10.3724/sp.j.1047.2008.00014
发表时间：
2008-01
期刊：
Geo-information Science
影响因子：
--
作者：
Chengcheng Xu
通讯作者：
Chengcheng Xu
2016年主要台风对西北太平洋海面特征的影响
影响因子：
3.4
作者：
Song Dan;Guo Linghui;Duan Zhigang;Xiang Lulu
通讯作者：
Xiang Lulu
DOI：
--
发表时间：
2015
期刊：
Journal of Tropical Oceanography
影响因子：
--
作者：
Yang Long-q
通讯作者：
Yang Long-q
DOI：
--
发表时间：
2007
期刊：
Periodical of Ocean University of China
影响因子：
--
作者：
X. Wen
通讯作者：
X. Wen
DOI：
--
发表时间：
2006
期刊：
Journal of Tropical Oceanography
影响因子：
--
作者：
Liu Zenghong
通讯作者：
Liu Zenghong