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- W2010984506 abstract "In the western equatorial Atlantic, 5 years of satellite Sea Surface Temperature (SST) measurements (1998–2002) from the cloud penetrating Tropical Rainfall Measuring Mission (TRMM) Microwave Imager reveal SST signatures of rings shedding from the North Brazil Current (NBC) as it separates from the South American coastline north of the Amazon River Delta and retroflects eastward between 5 and 10°N. By removing the spatial-mean SST from a 7° by 7° square of the nearly instantaneous measurements of each satellite pass, the 46.7 day aliasing period of the diurnal solar cycle is reduced, and seven to eight rings are observed per year with relatively warm (cold) SST anomalies of up to 1 °C in the first (second) half of the year. The sense of the SST anomalies carried by the NBC rings are determined by the contrast between the NBC SST and the regional SSTs that are influenced by the far-reaching seasonally varying Amazon River freshwater plume. Within a 1.6-year period, 12 of the SST anomalies are validated by in situ mooring array data confirming the predicted sense of the SST anomalies for each season. According to historical hydrographic data, during the first half of the year, the Amazon Plume is generally contained northwest along the coast, whereas during the second half of the year, the Amazon Plume surrounds the NBC retroflection on the west and the north, and from the surface down to 50 m, imposing a dramatic surface salinity contrast up to −4 and a surface temperature contrast up to +2 °C across the front. The surface layer characteristics of the rings shed from the NBC retroflection reveal varying influence of the Amazon Plume. Of the four rings surveyed in the NBCR experiment, Amazon Plume water is found only on the edges of three surface-intensified rings, whereas it completely covers the surface layer of the one thermocline-intensified ring. The maximum current cores of the NBC and retroflection are observed within tens-of-meters of the edges of the Amazon Plume. As the fresher and typically warmer surface waters associated with the Amazon Plume are buoyant relative to the saltier and typically colder surface waters carried by the NBC, the varying position of the Amazon Plume may seasonally influence the surface dynamics in the region." @default.
- W2010984506 created "2016-06-24" @default.
- W2010984506 creator A5059877557 @default.
- W2010984506 date "2005-01-01" @default.
- W2010984506 modified "2023-09-30" @default.
- W2010984506 title "North Brazil current rings viewed by TRMM Microwave Imager SST and the influence of the Amazon Plume" @default.
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- W2010984506 doi "https://doi.org/10.1016/j.dsr.2004.05.013" @default.
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