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

Martin Montes-Hugo, Colm Sweeney, Scott C. Doney, Hugh Ducklow, Robert Frouin, Douglas G. Martinson, Sharon Stammerjohn, Oscar Schofield

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The Southern Ocean is a climatically sensitive region that plays an important role in the regional and global modulation of atmospheric CO 2. 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 (DICSurfz.ast;) during midsummer. The greater ChlSurf accumulation and DIC Surfz.ast; 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 DICSurfz.ast; 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 DICSurfz. ast; was not related to DICSurfz.ast; 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.

Original languageEnglish (US)
Article numberC03024
JournalJournal of Geophysical Research: Oceans
Volume115
Issue number3
DOIs
StatePublished - Mar 2010

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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