气候变化领域集成服务门户(CCPortal): Influence of the Pacific-South American Modes on the Global Spectral Wind-Wave Climate

CCPortal

DOI	10.1029/2020JC016354
	Influence of the Pacific-South American Modes on the Global Spectral Wind-Wave Climate
	Echevarria E.R.; Hemer M.A.; Holbrook N.J.; Marshall A.G.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	In this study, we analyze the influence of the Pacific-South American modes (PSA-1 and PSA-2) on the global wind-wave climate using wave data derived from a WAVEWATCH III global wave hindcast. We apply an empirical orthogonal function analysis to daily-averaged directional wave spectra to extract the two main patterns of interannual wave spectral variability. These are related to changes in the wave spectral density levels (variability in the wave heights) and to rotations of the wave signal (variability in wave direction). The PSA-1 mode is positively correlated with the wave height variability in the southeast Pacific and negatively correlated in the Indian Ocean sector of the Southern Ocean. The PSA-2 mode presents a strong negative correlation with wave heights in the central South Pacific. Moreover, the PSA modes are significantly correlated with changes in modeled wave direction in the South Pacific region. Composite maps of wind anomalies during positive stages of PSA-1 and PSA-2 provide a compelling explanation for the observed correlation patterns. The methodology applied in this study is also used to assess the influence of other climate modes on the global wind-wave climate (namely, the Southern Annular Mode, Arctic Oscillation, North Atlantic Oscillation, El Niño/Southern Oscillation, and the Pacific North American mode). While our results are consistent with previous studies, we provide more clarity as to how different atmospheric modes influence the variability of specific components of the wave spectrum. Importantly, we assess how these climate modes would modulate the interannual variability of wave direction. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	climate modes; empirical orthogonal function analysis; Pacific-South American modes; spectral wave climate; wind-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/186730
作者单位	CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Australian Research Council Centre of Excellence for Climate Extremes, University of Tasmania, Hobart, TAS, Australia; Bureau of Meteorology, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Echevarria E.R.,Hemer M.A.,Holbrook N.J.,et al. Influence of the Pacific-South American Modes on the Global Spectral Wind-Wave Climate[J],2020,125(8).
APA	Echevarria E.R.,Hemer M.A.,Holbrook N.J.,&Marshall A.G..(2020).Influence of the Pacific-South American Modes on the Global Spectral Wind-Wave Climate.Journal of Geophysical Research: Oceans,125(8).
MLA	Echevarria E.R.,et al."Influence of the Pacific-South American Modes on the Global Spectral Wind-Wave Climate".Journal of Geophysical Research: Oceans 125.8(2020).