In situ calcium carbonate dissolution in the Pacific Ocean

被引:152
作者
Feely, RA
Sabine, CL
Lee, K
Millero, FJ
Lamb, MF
Greeley, D
Bullister, JL
Key, RM
Peng, TH
Kozyr, A
Ono, T
Wong, CS
机构
[1] NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA
[2] Princeton Univ, Atmospher & Ocean Sci Program, Princeton, NJ 08544 USA
[3] Oak Ridge Natl Lab, Carbon Dioxide Informat Anal Ctr, Oak Ridge, TN 37831 USA
[4] Pohang Univ Sci & Technol, Sch Environm Sci & Engn, Pohang, South Korea
[5] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA
[6] Hokkaido Natl Fisheries Res Inst, Kushiro 0850802, Japan
[7] NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 USA
[8] NOAA, Pacific Marine Environm Lab, Univ Washington, Joint Inst Study Atmosphere & Oceans, Seattle, WA 98115 USA
[9] Fisheries & Oceans Canada Inst Ocean Sci, Sidney, BC V8L 4B2, Canada
关键词
CaCO3; dissolution; anthropogenic CO2; Pacific Ocean; aragonite saturation; calcite saturation; carbonate lysocline;
D O I
10.1029/2002GB001866
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Over the past several years researchers have been working to synthesize the WOCE/JGOFS global CO2 survey data to better understand carbon cycling processes in the oceans. The Pacific Ocean data set has over 35,000 sample locations with at least two carbon parameters, oxygen, nutrients, CFC tracers, and hydrographic parameters. In this paper we estimate the in situ CaCO3 dissolution rates in the Pacific Ocean water column. Calcium carbonate dissolution rates ranging from 0.01-1.1 mumol kg(-1) yr(-1) are observed in intermediate and deepwater beginning near the aragonite saturation horizon. In the North Pacific Intermediate Water between 400 and 800 m, CaCO3 dissolution rates are more than 7 times faster than observed in middle and deep water depths (average=0.051 m mol kg(-1) yr(-1)). The total amount of CaCO3 that is dissolved within the Pacific is determined by integrating excess alkalinity throughout the water column. The total inventory of CaCO3 added by particle dissolution in the Pacific Ocean, north of 40degreesS, is 157 Pg C. This amounts to an average dissolution rate of approximately 0.31 Pg C yr(-1). This estimate is approximately 74% of the export production of CaCO3 estimated for the Pacific Ocean. These estimates should be considered to be upper limits for in situ carbonate dissolution in the Pacific Ocean, since a portion of the alkalinity increase results from inputs from sediments.
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页数:12
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