Seasonal and spatial patterns in mass and organic matter sedimentation in the North Water

被引:37
作者
Hargrave, BT
Walsh, ID
Murray, DW
机构
[1] Fisheries & Oceans Canada, Bedford Inst Oceanog, Marine Environm Sci Div, Dartmouth, NS B2Y 4A2, Canada
[2] Oregon State Univ, Dept Oceanog, Corvallis, OR 97331 USA
[3] Brown Univ, Ctr Environm Studies, Providence, RI 02912 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0967-0645(02)00187-X
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Sedimentation rates in the North Water between September 1997 and July 1999 were calculated from integrated monthly values for dry and organic matter, organic carbon, nitrogen, and sum-chloropigments, using pairs of multi-cup sediment traps moored at two depths > 200 m at five stations. Highest fluxes in upper traps (144 and 297 g m(-2) yr(-1), 8 and 12 g C m(-2) yr(-1)) occurred near Ellesmere Island at the western end of a cross-polynya transect (76degreesN). Rates to the east under the West Greenland Current (35 and 124 g m(-2) yr(-1), 4 and 7 g C m(-2) yr(-1)) were higher than those in the central area of the polynya (13 and 39 g m(-2) yr(-1), 1.4 and 2.6 g C m(-2) yr(-1)) and to the north at the entrance to Kane Basin (78degreesN), where levels of inorganic matter in settled material were relatively high (50 g m(-2) yr(-1), 1.8 g C m(-2) yr(-1)). Minimum fluxes in upper traps (4.2 g m(-2) yr(-1), 0.7 g C m(-2) yr(-1)) were measured at the southern limit of the polynya in northern Baffin Bay (75degreesN). Annual fluxes of particulate matter in the polynya between 1997 and 1999 (4-308 g m(-2) yr(-1), 1-14 g C m(-2) yr(-1)) are higher than previously reported for ice-covered arctic regions. There was a similar seasonal progression at all locations with sedimentation rates increasing from winter minima during March followed by a larger secondary peak of maximum particle flux between June and September. Maximum sedimentation occurred earlier (April-June) on the eastern side of the polynya than off the coast of Ellesmere Island (July-September). High fluxes were sustained through late fall and early winter months at sites close to the coasts of both Greenland and Ellesmere Island. At most stations 40-50% of the annual organic matter sedimentation occurred during a prolonged period of high sedimentation between June and October. Sedimentation rates at 50m above bottom were 30-50% higher than at shallower depths and settled material contained higher amounts of inorganic matter. Annual fluxes for all variables at four stations where between-year comparisons could be made showed that rates were two to five times higher in the second year of the study. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
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页码:5227 / 5244
页数:18
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