남극해 해면수온의 상승이 편서풍의 변동과 관련이 있는가?

Title
남극해 해면수온의 상승이 편서풍의 변동과 관련이 있는가?
Alternative Title
Is Southern Ocean sea surface warming linked with changes in the westerlies?
Author(s)
김용선; 장찬주
KIOST Author(s)
Kim, Yong Sun(김용선)Jang, Chan Joo(장찬주)
Publication Year
2014-11-07
Abstract
The Southern Hemisphere westerly winds have been intensified and shifted toward Antarctica during past few decades. The wind changes have been widely known to contribute to warming in the Southern Ocean through either southward shifts of the Antarctic Circumpolar Current (ACC) or enhanced southward eddy fluxes. In this study, we aim to investigate the contribution of the wind changes to SST trends by analyzing an AVHRR-based sea surface temperature dataset during the last three decades. A distinct difference in SST trends is observed between Subtropic and ACC regions. On a long-term timescale, a negligible trend with year-to-year perturbations in the ACC contrasts with a persistent warming trend by 0.15±0.08°C per decade throughout subtropics. The intensified winds, as an instantaneous influence, contribute to a broad warming over the subtropics, while the winds lead to a slight cooling trend in the ACC. Collectively, at most 8% of the SST trend is accountable as a direct response of the wind system changes. Localized warming over the Southeast Indian and Atlantic sectors of the ACC offsets the wind-driven broad cooling trend in the ACC region, indicating that this warming is determined largely by a localized oceanic mechanism. It is hypothesized that the poleward expansion of the Indo-Atlantic supergyre might lead to the localized warming.e Antarctic Circumpolar Current (ACC) or enhanced southward eddy fluxes. In this study, we aim to investigate the contribution of the wind changes to SST trends by analyzing an AVHRR-based sea surface temperature dataset during the last three decades. A distinct difference in SST trends is observed between Subtropic and ACC regions. On a long-term timescale, a negligible trend with year-to-year perturbations in the ACC contrasts with a persistent warming trend by 0.15±0.08°C per decade throughout subtropics. The intensified winds, as an instantaneous influence, contribute to a broad warming over the subtropics, while the winds lead to a slight cooling trend in the ACC. Collectively, at most 8% of the SST trend is accountable as a direct response of the wind system changes. Localized warming over the Southeast Indian and Atlantic sectors of the ACC offsets the wind-driven broad cooling trend in the ACC region, indicating that this warming is determined largely by a localized oceanic mechanism. It is hypothesized that the poleward expansion of the Indo-Atlantic supergyre might lead to the localized warming.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25780
Bibliographic Citation
2014추계해양학회, pp.19, 2014
Publisher
해양학회
Type
Conference
Language
English
Publisher
해양학회
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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