Transient Response of the Gulf Stream to Multiple Hurricanes in 2017
Transient Response of the Gulf Stream to Multiple Hurricanes in 2017
复制标题
DOI：
10.1029/2018gl079180
复制
发表时间：
2018-02
影响因子：
5.2
通讯作者：
R. Todd;Taylor G. Asher;Joleen Heiderich;J. Bane;R. Luettich
中科院分区：
文献类型：
--
作者：
R. Todd;Taylor G. Asher;Joleen Heiderich;J. Bane;R. Luettich
在2017年飓风Irma，Jose和Maria期间和之后收集的自主水下滑翔机观测结果显示，墨西哥湾流内有两种类型的瞬态响应。首先，在墨西哥湾沿岸的墨西哥湾流的表面附近和核心内观察到的异常淡水可能是由于伊尔玛的降雨被夹带到环流-墨西哥湾流系统中。其次，墨西哥湾流的流量在何塞和玛丽亚之后的两周内减少了40%。输送减少具有正压和深度依赖的特征。通过佛罗里达海峡和再分析风之间的相关性表明，当地的风在佛罗里达海峡和墨西哥湾流更远的下游可能有助于减少运输。为了澄清潜在的动力学，需要使用数值模型进行额外的分析，这些模型可以捕捉墨西哥湾流对短时间内经过附近的多个热带气旋的瞬态响应。
Autonomous underwater glider observations collected during and after 2017 Hurricanes Irma, Jose, and Maria show two types of transient response within the Gulf Stream. First, anomalously fresh water observed near the surface and within the core of the Gulf Stream offshore of the Carolinas likely resulted from Irma's rainfall being entrained into the Loop Current‐Gulf Stream system. Second, Gulf Stream volume transport was reduced by as much as 40% for about 2 weeks following Jose and Maria. The transport reduction had both barotropic and depth‐dependent characteristics. Correlations between transport through the Florida Straits and reanalysis winds suggest that both local winds in the Florida Straits and winds over the Gulf Stream farther downstream may have contributed to the transport reduction. To clarify the underlying dynamics, additional analyses using numerical models that capture the Gulf Stream's transient response to multiple tropical cyclones passing nearby in a short period are needed.