Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0513.1 |
A Role for the Equatorial Undercurrent in the Ocean Dynamical Thermostat | |
Coats, S.1,2,4; Karnauskas, K. B.2,3 | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:16页码:6245-6261 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Reconstructions of sea surface temperature (SST) based on instrumental observations suggest that the equatorial Pacific zonal SST gradient has increased over the twentieth century. While this increase is suggestive of the ocean dynamical thermostat mechanism of Clement et al., observations of a concurrent weakening of the zonal atmospheric (Walker) circulation are not. Here we show, using heat and momentum budget calculations on an ocean reanalysis dataset, that a seasonal weakening of the zonal atmospheric circulation is in fact consistent with cooling in the eastern equatorial Pacific (EEP) and thus an increase in the zonal SST gradient. This cooling is driven by a strengthening Equatorial Undercurrent (EUC) in response to decreased upper-ocean westward momentum associated with weakening equatorial zonal wind stress. This process can help to reconcile the seemingly contradictory twentieth-century trends in the tropical Pacific atmosphere and ocean. Moreover, it is shown that coupled general circulation models (CGCMs) do not correctly simulate this process; we identify a systematic bias in the relationship between changes in equatorial surface zonal wind stress in the EEP and EUC strength that may help to explain why observations and CGCMs have opposing trends in the zonal SST gradient over the twentieth century. |
英文关键词 | Tropics Atmosphere-ocean interaction Climate change Climate models Trends |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438189800002 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; ZONAL MOMENTUM BALANCE ; EL-NINO ; PACIFIC-OCEAN ; CIRCULATION ; REANALYSIS ; TRENDS ; PATTERNS ; MODELS ; CMIP5 |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19327 |
专题 | 气候变化 |
作者单位 | 1.Univ Colorado Boulder, Climate & Global Dynam Lab, Natl Ctr Atmospher Res, Boulder, CO 80309 USA; 2.Univ Colorado Boulder, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 3.Univ Colorado Boulder, Dept Atmospher & Ocean Sci, Boulder, CO USA; 4.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA |
推荐引用方式 GB/T 7714 | Coats, S.,Karnauskas, K. B.. A Role for the Equatorial Undercurrent in the Ocean Dynamical Thermostat[J]. JOURNAL OF CLIMATE,2018,31(16):6245-6261. |
APA | Coats, S.,&Karnauskas, K. B..(2018).A Role for the Equatorial Undercurrent in the Ocean Dynamical Thermostat.JOURNAL OF CLIMATE,31(16),6245-6261. |
MLA | Coats, S.,et al."A Role for the Equatorial Undercurrent in the Ocean Dynamical Thermostat".JOURNAL OF CLIMATE 31.16(2018):6245-6261. |
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