BENTHIC OXYGEN FLUXES ON THE WASHINGTON SHELF AND SLOPE - A COMPARISON OF INSITU MICROELECTRODE AND CHAMBER FLUX MEASUREMENTS

被引:198
作者
ARCHER, D [1 ]
DEVOL, A [1 ]
机构
[1] UNIV WASHINGTON,SCH OCEANOG,SEATTLE,WA 98195
关键词
D O I
10.4319/lo.1992.37.3.0614
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Benthic oxygen fluxes calculated from in situ microelectrode profiles are compared with benthic flux chamber O2 uptake measurements on a transect of eight stations across the continental shelf and three stations on the slope of Washington State. Station depths ranged from 40 to 630 m and bottom-water oxygen concentrations were 127-38-mu-M. The fluxes measured by the two methods were similar on the slope, but on the shelf, the chamber flux exceeded the microelectrode flux by as much as a factor of 3-4. We attribute this difference to pore-water irrigation, a process which apparently accounts for the oxidation of a significant amount of organic C in the continental shelf sediments. Combining our diffusive flux data with other data demonstrates clearly that the bottom-water oxygen concentration must play some significant role in determining the sedimentary oxygen consumption rate. Numerical simulation of the microelectrode O2 profiles suggests that roughly half the diffusive O2 flux must be consumed within approximately 1 mm of the sediment surface. If this conclusion is correct, then the magnitude of the diffusive flux depends both on the bottom-water oxygen concentration and on the supply rate of labile C to the sediment surface.
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页码:614 / 629
页数:16
相关论文
共 39 条
[2]   MEASUREMENTS OF DIFFUSIVITY NEAR THE SEDIMENT-WATER INTERFACE WITH A FINE-SCALE RESISTIVITY PROBE [J].
ANDREWS, D ;
BENNETT, A .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1981, 45 (11) :2169-2175
[3]   DISSOLUTION OF CALCITE IN DEEP-SEA SEDIMENTS - PH AND O-2 MICROELECTRODE RESULTS [J].
ARCHER, D ;
EMERSON, S ;
REIMERS, C .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (11) :2831-2845
[4]   DIRECT MEASUREMENT OF THE DIFFUSIVE SUBLAYER AT THE DEEP-SEA FLOOR USING OXYGEN MICROELECTRODES [J].
ARCHER, D ;
EMERSON, S ;
SMITH, CR .
NATURE, 1989, 340 (6235) :623-626
[5]   ORGANIC-CARBON OXIDATION AND BENTHIC NITROGEN AND SILICA DYNAMICS IN SAN-CLEMENTE BASIN, A CONTINENTAL BORDERLAND SITE [J].
BENDER, M ;
JAHNKE, R ;
WEISS, R ;
MARTIN, W ;
HEGGIE, DT ;
ORCHARDO, J ;
SOWERS, T .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (03) :685-697
[6]  
BERELSON WM, 1987, MAR TECHNOL SOC J, V21, P26
[7]   SULFATE REDUCTION AND OXIC RESPIRATION IN MARINE-SEDIMENTS - IMPLICATIONS FOR ORGANIC-CARBON PRESERVATION IN EUXINIC ENVIRONMENTS [J].
CANFIELD, DE .
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS, 1989, 36 (01) :121-138
[8]   HAS MAN ALTERED THE CYCLING OF NUTRIENTS AND ORGANIC-C ON THE WASHINGTON CONTINENTAL-SHELF AND SLOPE [J].
CARPENTER, R .
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS, 1987, 34 (5-6) :881-896
[9]   PB-210 ACTIVITIES IN AND FLUXES TO SEDIMENTS OF THE WASHINGTON CONTINENTAL-SLOPE AND SHELF [J].
CARPENTER, R ;
BENNETT, JT ;
PETERSON, ML .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1981, 45 (07) :1155-1172
[10]  
CARPENTER R, 1989, COASTAL OCEANOGRAPHY, P367