Download PDF by unknown: Antarctic Sea Ice: Biological Processes, Interactions and

By unknown

ISBN-10: 0875909019

ISBN-13: 9780875909011

ISBN-10: 1118668146

ISBN-13: 9781118668146

About The Product

Published through the yankee Geophysical Union as a part of the Antarctic study Series.

The four million to twenty million sq. kilometers of sea ice that surrounds the Antarctic continent represents one of many biggest and such a lot dynamic ecosystems on the earth. This sea ice matrix offers a habitat for a wide selection of organisms, a few of which dwell their whole lives in the ice whereas others are just occasional viewers. huge grazers, resembling copepods and krill which come to the ocean ice to feed, characterize very important hyperlinks among sea ice biota and the pelagic surroundings. regrettably, as a result inherent trouble of sampling such an atmosphere, many facets of this detailed habitat are nonetheless poorly understood. the aim of this quantity is to offer new information regarding this atmosphere in order that its position in the Antarctic food-web (and as a sink for carbon dioxide) and its susceptibility to environmental adjustments will be higher understood.

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This low productivitywas the result of a high proportionof multi-year sea ice and relatively thin snow over a relatively transientfirst-year ice cover. Between October and February,multi-year ice accountedfor 40% to 64% of total sea ice cover, more than any other Antarctic sector. 14 m. 2 m was much more extensive. Results of the model show that the infiltration community in the Weddell Sea benefited greatly from this thicker snow cover since the resulting surface flooding ensured a greater nutrient supply and higher growth rates.

PacificOceansectorhad lower spatiallyaveragedrates of production(Plate 2, Table 1). 6. 10g C m'2month'l),butamounted to less Because the western South Pacific sector is the least than one half the rate in Weddell Sea first-yearice. 11 Tg, or 59%, was pro- contrastto the highly productiveWeddell Sea. The low ducedin first-yearice. productivityof the westernSouthPacificsectorwas due in partto the extremelylimited seaice area. 5. 95 g C m-: month 'l in January), bloom. In the Weddell Sea, the mean snow thickness which was <50% of the rate in the Weddell Sea.

This informationwill lead to an increasedunderstandingof SouthernOcean ecosystemsas well as improve carbonbudgetsfor this region. 2. 1 Description The numericalmodel used in the presentstudy calculatesthe spatial and temporal variability of primary productivityin Antarctic sea ice (Figure 1) betweenOctober 1, 1989 and April 30, 1990 using a modified version of a one-dimensionalproductivitymodel described in Arrigo et al. [1993a] and Arrigo and Sullivan [1994]. The model includes componentsdescribing 1) atmospheric spectralradiation (400-700 nm) as a function of time, date, latitude,and cloudcover,2) in-ice bio-optics, 3) seaice geophysics,and4) biologicaldynamics.

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