Anatomizing the Ocean's role in maintaining the pacific decadal variability

CCUR > College of Natural Science and Engineering > College of Science > Department of Atmospheric Sciences & Graduate Institute of Earth Science / Atmospheric Science > journal articles > Item 987654321/29218

Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/29218

Title:	Anatomizing the Ocean's role in maintaining the pacific decadal variability
Authors:	Yu, Jia-Yuh Chang, Cheng-Wei
Contributors:	大氣系
Keywords:	cific decadal variability term balance analysis perturbation heat budget equation
Date:	2014-05
Issue Date:	2015-01-27 09:46:16 (UTC+8)
Abstract:	The role of ocean dynamics in maintaining the Pacific Decadal Variability (PDV) was investigated based on simulation results from the Parallel Ocean Program (POP) ocean general circulation model developed at the Los Alamos National Laboratory (LANL). A long-term control simulation of the LANL-POP model forced by a reconstructed coupled wind stress field over the period 1949-2001 showed that the ocean model not only simulates a reasonable climatology, but also produces a climate variability pattern very similar to observed PDV. In the Equatorial Pacific (EP) region, the decadal warming is confined in the thin surface layer. Beneath the surface, a strong compensating cooling, accompanied by a basin-wide-scale overturning circulation in opposition to the mean flow, occurs in the thermocline layer. In the North Pacific (NP) region, the decadal variability nonetheless exhibits a relatively monotonous pattern, characterized by the dominance of anomalous cooling and eastward flows. A term balance analysis of the perturbation heat budget equation was conducted to highlight the ocean's role in maintaining the PDV-like variability over the EP and NP regions. The analyses showed that strong oceanic adjustment must occur in the equatorial thermocline in association with the anomalous overturning circulation in order to maintain the PDV-like variability, including a flattening of the equatorial thermocline slpoe and an enhancement of the upper ocean's stratification (stability), as the climate shifts from a colder regime toward a warmer one. On the other hand, the oceanic response in the extratropical region seems to be confined to the surface layer, without much participation from the subsurface oceanic dynamics.
Relation:	ADVANCES IN ATMOSPHERIC SCIENCES 卷: 31 期: 3 頁碼: 611-623
Appears in Collections:	[Department of Atmospheric Sciences & Graduate Institute of Earth Science / Atmospheric Science ] journal articles

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	501	View/Open

View Licence

Loading...