期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 126, 期 5, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JC017146
关键词
Brazil Current; meridional overturning circulation; observations; transport array; variability; volume transport
类别
资金
- Servicio de Hidrografia Naval
- CONICET
- NOAA
- the Inter-American Institute for Global Change Research through the U.S. National Science Foundation [CRN2076, CRN3070, GEO0452325, GEO-1128040]
- NOAA Global Ocean Monitoring and Observing program under the Southwest Atlantic Meridional Overturning Circulation (SAM) project [100007298]
- CNPq [302503/2019-6]
- FAPESP [2011/50552-4, 2017/09659-6]
- European Union's Horizon 2020 Research and Innovation Program [818123]
- NOAA Atlantic Oceanographic and Meteorological Laboratory
- NOAA Climate Variability Program [GC16-212, GC16-210]
- NOAA [NA13OAR4310131]
- NASA [NNX14AH60G]
- NOAA Global Ocean Monitoring and Observing program under the XBT project and State of the Climate: Quarterly Report on the Meridional Heat Transport in the Atlantic Ocean project
- NASA [681751, NNX14AH60G] Funding Source: Federal RePORTER
This study presents the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained through over six years of observations, showing that about 80% of the absolute transport variance of the Brazil Current is concentrated at periods shorter than 150 days, with the baroclinic and barotropic transports being uncorrelated.
The Brazil Current, the western limb of the subtropical gyre of the South Atlantic Ocean, is one of the major Western Boundary Currents of the global ocean. Here, we present the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained using 6+ years of observations from a line of four pressure-recording inverted echo sounders (PIES) deployed at 34.5 degrees S. The array was augmented in December 2012 with two current meter-equipped PIES and in December 2013 with a moored Acoustic Doppler Current Profiler on the upper continental slope. The Brazil Current is bounded by the sea surface and the neutral density interface separating South Atlantic Central Water and Antarctic Intermediate Water, which is on average at a reference pressure of 628 +/- 46 dbar, and it is confined west of 49.5 degrees W. The Brazil Current has a mean strength of -14.0 +/- 2.8 Sv (1 Sv equivalent to 10(6) m(3) s(-1); negative indicates southward flow) with a temporal standard deviation of 8.8 Sv and peak-to-peak range from -41.7 to +20 Sv. About 80% of the absolute transport variance is concentrated at periods shorter than 150 days with a prominent peak at 100 days. The baroclinic component accounts for 85% of the absolute transport variance, but the barotropic variance is not negligible. The baroclinic and barotropic transports are uncorrelated, demonstrating the need to measure both transport components independently. Given the energetic high frequency transport variations, statistically significant seasonal to interannual variability and trends have yet to be detected.
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