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AGU: Journal of Geophysical Research, Oceans

 

Keywords

  • climate variability
  • Antarctica
  • carbonate system

Index Terms

  • Biogeosciences: Marine systems
  • Oceanography: Biological and Chemical: Carbon cycling
  • Global Change: Climate dynamics
  • Paleoceanography: Abrupt/rapid climate change
  • Global Change: Oceans
Abstract
Cited By (0)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115, C03024, 12 PP., 2010
doi:10.1029/2009JC005267

Seasonal forcing of summer dissolved inorganic carbon and chlorophyll a on the western shelf of the Antarctic Peninsula

Martin Montes-Hugo

Coastal Ocean Observation Lab, Institute of Marine and Coastal Sciences, School of Environmental and Biological Sciences, Rutgers-State University of New Jersey, New Brunswick, New Jersey, USA

Colm Sweeney

Global Monitoring Division, Earth Systems Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USA

Scott C. Doney

Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Hugh Ducklow

Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts, USA

Robert Frouin

Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA

Douglas G. Martinson

Lamont-Doherty Earth Observatory, Department of Earth and Environmental Sciences, Columbia University, Palisades, New York, USA

Sharon Stammerjohn

Ocean Sciences, University of California, Santa Cruz, California, USA

Oscar Schofield

Coastal Ocean Observation Lab, Institute of Marine and Coastal Sciences, School of Environmental and Biological Sciences, Rutgers-State University of New Jersey, New Brunswick, New Jersey, USA

The Southern Ocean is a climatically sensitive region that plays an important role in the regional and global modulation of atmospheric CO2. Based on satellite-derived sea ice data, wind and cloudiness estimates from numerical models (National Centers for Environmental Prediction-National Center for Atmospheric Research reanalysis), and in situ measurements of surface (0–20 m depth) chlorophyll a (ChlSurf) and dissolved inorganic carbon (DICSurf) concentration, we show sea ice concentration from June to November and spring wind patterns between 1979 and 2006 had a significant influence on midsummer (January) primary productivity and carbonate chemistry for the Western Shelf of the Antarctic Peninsula (WAP, 64°–68°S, 63.4°–73.3°W). In general, strong (>3.5 m s−1) and persistent (>2 months) northerly winds during the previous spring were associated with relatively high (monthly mean > 2 mg m−3) ChlSurf and low (monthly mean < 2 mmol kg−1) salinity-corrected DIC (DICSurf*) during midsummer. The greater ChlSurf accumulation and DICSurf* depletion was attributed to an earlier growing season characterized by decreased spring sea ice cover or nearshore accumulation of phytoplankton in association with sea ice. The impact of these wind-driven mechanisms on ChlSurf and DICSurf* depended on the extent of sea ice area (SIA) during winter. Winter SIA affected phytoplankton blooms by changing the upper mixed layer depth (UMLD) during the subsequent spring and summer (December–January–February). Midsummer DICSurf* was not related to DICSurf* concentration during the previous summer, suggesting an annual replenishment of surface DIC during fall/winter and a relatively stable pool of deep (>200 m depth) “winter-like” DIC on the WAP.

Received 7 January 2009; accepted 3 November 2009; published 30 March 2010.

Citation: Montes-Hugo, M., C. Sweeney, S. C. Doney, H. Ducklow, R. Frouin, D. G. Martinson, S. Stammerjohn, and O. Schofield (2010), Seasonal forcing of summer dissolved inorganic carbon and chlorophyll a on the western shelf of the Antarctic Peninsula, J. Geophys. Res., 115, C03024, doi:10.1029/2009JC005267.

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