期刊
GEOPHYSICAL RESEARCH LETTERS
卷 45, 期 9, 页码 4180-4188出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018GL077408
关键词
meridional overturning circulation; South Atlantic; overturning; volume transport; observations
资金
- NOAA Climate Program Office-Ocean Observing and Monitoring Division under the Southwest Atlantic Meridional Overturning Circulation (SAM) project [100007298]
- Cooperative Institute for Marine and Atmospheric Studies (CIMAS), a cooperative institute of the University of Miami [NA10OAR4320143]
- Cooperative Institute for Marine and Atmospheric Studies (CIMAS), a cooperative institute of the NOAA [NA10OAR4320143]
- NOAA Climate Variability Program [GC16-212]
- NOAA [NA13OAR4310131]
- NASA [NNX14AH60G]
- NOAA Atlantic Oceanographic and Meteorological Laboratory
- SAMOC research project [11-ANR-56-004]
- European Union Horizon 2020 research and innovation programme [633211]
- CNPq [302018/2014-0]
- FAPESP [2011/50552-4, 2017/09659-6]
- DST-NRF-SANAP program
- South African DEA
- Inter-American Institute for Global Change Research [CRN3070]
- U.S. NSF [GEO-1128040]
- NASA [681751, NNX14AH60G] Funding Source: Federal RePORTER
Six years of simultaneous moored observations near the western and eastern boundaries of the South Atlantic are combined with satellite winds to produce a daily time series of the basin-wide meridional overturning circulation (MOC) volume transport at 34.5 degrees S. The results demonstrate that barotropic and baroclinic signals at both boundaries cause significant transport variations, and as such must be concurrently observed. The data, spanning similar to 20 months during 2009-2010 and similar to 4 years during 2013-2017, reveal a highly energetic MOC record with a temporal standard deviation of 8.3 Sv, and strong variations at time scales ranging from a few days to years (peak-to-peak range = 54.6 Sv). Seasonal transport variations are found to have both semiannual (baroclinic) and annual (Ekman and barotropic) timescales. Interannual MOC variations result from both barotropic and baroclinic changes, with density profile changes at the eastern boundary having the largest impact on the year-to-year variations.
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