Date of Award

5-2014

Level of Access

Campus-Only Thesis

Degree Name

Master of Science (MS)

Department

Oceanography

Advisor

Andrew C. Thomas

Second Committee Member

Emanuel Boss

Third Committee Member

Fei Chai

Abstract

Ten years of 1 km resolution NASA MODIS ocean color satellite data (2003-2012) covering the south-central Alaska Shelf (SCAS) from Kodiak Island to Yakutat Bay are used to quantify the temporal/spatial variability of total suspended matter (TSM) and chlorophyll. Satellite-based estimates of TSM are used to mask the most biased regions of satellite-estimated chlorophyll (>1 g m-3) in daily scenes. These are formed into monthly composites and used to view seasonal and interannual variability in TSM and chlorophyll and then are compared to local environmental metrics such as wind mixing, wind-driven cross-shelf Ekman transport, river discharge from the Copper River, coastal freshwater and cloud cover to examine links to forcing. TSM distributions are dominated by high concentrations entrained in the eastern portion of the Alaska Coastal Current (ACC) along the highly phytoplankton are light limited over the SCAS. Due to persistent cloud cover, however, we cannot rule out the possibility that our view of chl a interannual variability is biased by undersampling.

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