Characterizing the South Atlantic Bight seasonal variability and cold-water event in 2003 using a daily cloud-free SST and chlorophyll analysis.

coastal oceanography;satellites;SST;Chlorophyll;South Atlantic Bight

Miles, Travis ; Ping-Tung Shaw, Committee Member,Dan Kamykowski, Committee Member,Ruoying He, Committee Chair,Miles, Travis ; Ping-Tung Shaw ; Committee Member ; Dan Kamykowski ; Committee Member ; Ruoying He ; Committee Chair

University:North Carolina State University

关键词: coastal oceanography;    satellites;    SST;    Chlorophyll;    South Atlantic Bight;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/2461/etd.pdf?sequence=1&isAllowed=y

美国|英语

来源: null

【 摘 要 】

Concurrent MODIS sea surface temperature (SST) and chlorophyll-a (Chl-a) data are used with a new technique â€â€Data Interpolating Empirical Orthogonal Function (DINEOF) method â€â€to produce daily, 4-km, cloud-free SST and Chl-a analyses for the South Atlantic Bight in 2003. Comparisons between SST analysis and in situ buoy temperature demonstrate DINEOF’s utility. To quantify connections between surface wind, SST and Chl-a variation, Empirical Orthogonal Function (EOF) analysis is applied to North American Regional Reanalysis winds, cloud-free DINEOF SST and Chl-a analyses. Wind EOF modes highlight upwelling winds from June to September. While the first SST mode represents seasonal heat flux variations, the second SST mode shows a direct response to upwelling winds with an abrupt drop in SST. The top two Chl-a EOF modes show less connection with wind, suggesting more subsurface Chl-a and nutrient observations are needed to quantify its relation with surface wind.An additional study is performed on a larger DINEOF SST and Chlorophyll-a dataset including 2003-2007 for an identical spatial domain. This dataset puts the 2003 cold event in the context of a long-term dataset. An analysis of the Gulf Stream summer position is performed using the 0.25 mg/m3 Chl-a contour line to define the Gulf Stream front. When compared to 2004-2007, 2003 has an anomalous offshore position.