气候变化领域集成服务门户(CCPortal): Biweekly Mixed Rossby-Gravity Waves in the Equatorial Indian Ocean

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DOI	10.1029/2020JC016840
	Biweekly Mixed Rossby-Gravity Waves in the Equatorial Indian Ocean
	Pujiana K.; McPhaden M.J.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	This study describes biweekly (defined as periods between 10 and 15 days) ocean variability in relation to equatorial wave theory using a comprehensive set of moored ocean current velocities as well as satellite-retrieved oceanic and atmospheric parameters in the Indian Ocean. Moored biweekly current velocities exhibit the meridional structure of mixed Rossby-gravity waves: Symmetric for meridional velocity and antisymmetric for zonal velocity around the equator with a decay scale of 228–309 km. The biweekly meridional velocity along the equator has average zonal and vertical wavelengths of 3,430 ± 550 km and 0.76 ± 0.15 km, respectively, with phase propagating westward at speeds of 2.8–3.1 m s−1 and upward at 54–56 m day−1. Conversely, wave energy is inferred to propagate eastward and downward. The range of best fit constants (1.4–2.0 m s−1) that result from the linear separation of horizontal and vertical wave structures suggests the second baroclinic wave mode is dominant over other low baroclinic modes in accounting for the velocity variability. The biweekly waves are forced by surface winds; satellite-derived wind stress, sea level, and surface current anomalies, regressed against the first principal component of the biweekly moored velocities, illustrate the basin-scale structure and temporal evolution of the waves. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	equatorial Indian Ocean; equatorial waves; mixed Rossby-gravity waves
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/186304
作者单位	NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States; Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia; Now at Cooperative Institute for Marine and Atmospheric Studies of University of Miami and NOAA Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States
推荐引用方式 GB/T 7714	Pujiana K.,McPhaden M.J.. Biweekly Mixed Rossby-Gravity Waves in the Equatorial Indian Ocean[J],2021,126(5).
APA	Pujiana K.,&McPhaden M.J..(2021).Biweekly Mixed Rossby-Gravity Waves in the Equatorial Indian Ocean.Journal of Geophysical Research: Oceans,126(5).
MLA	Pujiana K.,et al."Biweekly Mixed Rossby-Gravity Waves in the Equatorial Indian Ocean".Journal of Geophysical Research: Oceans 126.5(2021).