气候变化领域集成服务门户(CCPortal): Strengthening and Lengthening of the Hawaiian Lee Countercurrent Driven by the Pacific Trade Wind Acceleration

CCPortal

DOI	10.1029/2020JC016058
	Strengthening and Lengthening of the Hawaiian Lee Countercurrent Driven by the Pacific Trade Wind Acceleration
	Nan F.; Xue H.; Yu F.; Wang R.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	The Hawaiian Lee Countercurrent (HLCC) is a zonal eastward flowing current driven by the orographic wind stress curl (WSC) dipole on the leeside of the Hawaiian Islands, which plays an important role in the regional air-sea interactions. During the late 1990s and early 2010s, the Pacific trade winds exhibited an unprecedented acceleration with respect to the past century, thus implying a strengthening of the HLCC. Based on satellite observations, we found that the mean velocity and length of the HLCC increased by 53% and 97%, respectively, during the period of the Pacific trade wind acceleration (1999–2014) in comparison to the mean values during the weakened years (1993–1998 and 2015–2018). Correspondingly, the mean heat transport by the HLCC across the International Date Line during the strengthened years increased by 80% in comparison to that before 1999 and after 2014. The sea level anomaly (SLA) variation to the south of the HLCC was found to be the main factor controlling the changes in the HLCC. Local (i.e., near the Hawaiian Islands) and remote WSC both contributed to the SLA variation by exciting westward propagating oceanic Rossby waves, although the former was dominant. Our results also indicate that the dramatically changing HLCC plays an important role in eddy generation along the HLCC path. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Hawaiian Lee Countercurrent strengthening; Pacific trade wind acceleration; Rossby waves; sea level anomaly
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186786
作者单位	Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; School of Marine Sciences, University of Maine, Orono, ME, United States; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Pilot National Laboratory for Marine Science and Technology, Qingdao, China; College of Earth Science, University of Chinese Academy of Sciences, Beijing, China; College of Oceanography, Hohai University, Nanjing, China
推荐引用方式 GB/T 7714	Nan F.,Xue H.,Yu F.,et al. Strengthening and Lengthening of the Hawaiian Lee Countercurrent Driven by the Pacific Trade Wind Acceleration[J],2020,125(7).
APA	Nan F.,Xue H.,Yu F.,&Wang R..(2020).Strengthening and Lengthening of the Hawaiian Lee Countercurrent Driven by the Pacific Trade Wind Acceleration.Journal of Geophysical Research: Oceans,125(7).
MLA	Nan F.,et al."Strengthening and Lengthening of the Hawaiian Lee Countercurrent Driven by the Pacific Trade Wind Acceleration".Journal of Geophysical Research: Oceans 125.7(2020).