School of Earth and Space Sciences University of Science and Technology of China, Hefei, 230026, China.
School of Earth and Space Sciences University of Science and Technology of China, Hefei, 230026, China.
Mar Environ Res. 2024 Nov;202:106779. doi: 10.1016/j.marenvres.2024.106779. Epub 2024 Oct 6.
Tropical cyclones (TCs) in the Bay of Bengal (BoB) caused significant changes in the sea surface as they passed through the sea. To quantitatively study the differences in oceanic responses caused by TCs during pre-monsoon and post-monsoon seasons in the BoB from 2003 to 2020 and the varying importance of TC intensity and translation speed in modulating oceanic responses, the oceanic environmental parameters affected by TCs were composited and analyzed. The spatial distributions show that the responses of sea surface temperature (SST) rather than chlorophyll-a (Chl-a) concentrations and sea surface salinity (SSS) coincided with the maximum response centers of the wind power index (WPi). All the temporal changes in SST, Chl-a, and SSS indicated that the changes induced by TCs began approximately 2-3 days before TC passage, continued to increase during cyclone passage, and then slowly returned to the initial state after at least 8 days. Compared with TC intensity, TC translation speed generally played a less important role in influencing the ocean responses of SST, Chl-a and SSS. This result is somewhat different from previous results in which the response of Chl-a was correlated with TC translation speed rather than TC intensity in the northern Indian Ocean. In addition, the SSS response was positively proportional (R = 0.886) to the TC translation speed in the BoB, which was different from that in the Northwest Pacific. The differences in the responses during pre-monsoon and post-monsoon seasons were mainly in terms of quantity, as all the composited results were similar. In addition, they were more pronounced in their responses but less significant in their correlations during pre-monsoon.
孟加拉湾（BoB）的热带气旋（TCs）在经过海洋时会对海面产生显著变化。为了定量研究 2003 年至 2020 年 BoB 前季风和后季风季节 TC 引起的海洋响应差异，以及 TC 强度和移动速度在调节海洋响应方面的重要性变化，对受 TC 影响的海洋环境参数进行了合成和分析。空间分布表明，海表温度（SST）的响应而不是叶绿素-a（Chl-a）浓度和海表盐度（SSS）与风功率指数（WPi）的最大响应中心一致。SST、Chl-a 和 SSS 的所有时间变化表明，TC 引起的变化大约在 TC 经过前 2-3 天开始，在气旋经过期间持续增加，然后至少 8 天后缓慢恢复到初始状态。与 TC 强度相比，TC 移动速度通常在影响 SST、Chl-a 和 SSS 海洋响应方面的作用较小。这一结果与之前的结果有些不同，在前印度洋中，Chl-a 的响应与 TC 移动速度而不是 TC 强度有关。此外，BoB 中的 SSS 响应与 TC 移动速度呈正相关（R = 0.886），这与西北太平洋不同。前季风和后季风季节的响应差异主要在数量上，所有综合结果都相似。此外，前季风期间的响应更为明显，但相关性较小。
