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Seasonal and spatial variability of remotely sensed chlorophyll and physical fields in the SAZ-Sense region


Mongin, M and Matear, R and Chamberlain, M, Seasonal and spatial variability of remotely sensed chlorophyll and physical fields in the SAZ-Sense region, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (21-22) pp. 2082-2093. ISSN 0967-0645 (2011) [Refereed Article]

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DOI: doi:10.1016/j.dsr2.2011.06.002


The Sub Antarctic Zone Sensitivity to environmental change (SAZ-Sense) project focused on the northern boundary of the Southern Ocean south of Tasmania where there is a persistent and large summer zonal gradient in remote sensed ocean color surface chlorophyll (Chl). This paper presents the seasonality and spatial variability of surface Chl, nutrients, temperature, light availability in the region. First, we verify that remotely sensed ocean color zonal gradient reflects a real gradient in Chl. From seasonal and spatial patterns in the region, we conclude that neither temperature, macro-nutrients nor light availability can account for the observed large zonal gradient in the surface Chl. Other factors such as iron or ecosystem structure must explain the gradient. We also explore variability in the remote sensed observations during the cruise. At the SAZ east station, there is high mesoscale variability with corresponding high variability in Chl concentrations, with the spatial variability around the station exceeding the expected difference between the SAZ east and SAZ west processes stations. The interpretation of the collected cruise station data, particularly at the SAZ east site needs to consider mesoscale variability. Comparison of Seawifs images with cruise data shows good agreement, particularly for low Chl values (less than 1.5 mg m−3).

Item Details

Item Type:Refereed Article
Keywords:Sub-Antarctic Zone; High nutrient low chlorophyll; Chlorophyll-a; Sea surface temperature; Mesoscale variability
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Mongin, M (Mr Mathieu Mongin)
ID Code:76884
Year Published:2011
Web of Science® Times Cited:30
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-03-14
Last Modified:2012-05-22

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