Title Southern Ocean primary productivity; variability and a view to the future
Author Smith, W.O., Jr.; Comiso, J.C.
Author Affil Smith, W.O., Jr., Virginia Institute of Marine Sciences, Gloucester Point, VA. Other: NASA, Goddard Space Flight Center
Source p.309-318, ; Smithsonian at the poles, Washington, DC, May 3-4, 2007, edited by I. Krupnik, M.A. Lang and S.E. Miller. Publisher: Smithsonian Institution Scholarly Press, Washington, DC, United States. ISBN: 978-0-9788460-1-50-9788460-1- X
Publication Date 2009
Notes In English. NSF grant OPP-0087401 and OPP-0337247. 58 refs. Ant. Acc. No: 86096. CRREL Acc. No: 63004409
Index Terms chlorophylls; ecology; ice; ice cover; photosynthesis; remote sensing; solar radiation; Southern Ocean; chlorophyll; ice cover distribution; International Polar Year 2007-08; IPY 2007-08 Research Publications; nutrients; organic compounds; photochemistry; pigments; productivity; satellite methods; sea ice; sea-surface temperature
Abstract The primary productivity of the Southern Ocean south of 580S is assessed using satellite data on ice concentrations, sea surface temperatures, and pigment concentrations, a vertically generalized production model, and modeled photosynthetically active radiation. Daily productivity is integrated by month and by year to provide an estimate of new production. The productivity of the Southern Ocean is extremely low relative to other oceanic regions, with annual net rates throughout the region of less than 10 g C m- 2. This low annual value is largely the result of negligible productivity throughout much of the year due to low irradiance and high ice cover. Despite the annual oligotrophic state, monthly productivity during the summer (December through February) is substantially greater, averaging from 100 to 1,500 mg C m-2 mo-1. Substantial interannual variability occurs, and certain subregions within the Southern Ocean experience greater interannual variations than others. Those regions, like the West Antarctic Peninsula, the Ross Sea polynya region, and the Weddell Sea, are characterized as being continental shelf regions and/or those that are substantially impacted by ice. Despite this relationship, no significant changes in primary production were observed in regions where large trends in ice concentrations have been noted. The driving forces for this variability as well as the implications for long-term changes in regional and Southern Ocean productivity are discussed.
URL http://hdl.handle.net/10088/6825
Publication Type monograph
Record ID 292160