THE IMPACT OF A COCCOLITHOPHORE BLOOM ON OCEANIC CARBON UPTAKE IN THE NORTHEAST ATLANTIC DURING SUMMER 1991

被引:140
作者
ROBERTSON, JE
ROBINSON, C
TURNER, DR
HOLLIGAN, P
WATSON, AJ
BOYD, P
FERNANDEZ, E
FINCH, M
机构
[1] UNIV WALES,SCH OCEAN SCI,MENAI BRIDGE LL59 5EY,GWYNEDD,WALES
[2] UNIV BRITISH COLUMBIA,DEPT OCEANOG,VANCOUVER V6T 1Z1,BC,CANADA
[3] QUEENS UNIV BELFAST,MARINE BIOL STN,SCH BIOL & BIOCHEM,PORTAFERRY BT22 1PF,DOWN,NORTH IRELAND
[4] UNIV SOUTHAMPTON,DEPT OCEANOG,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND
[5] GOTHENBURG UNIV,DEPT ANALYT & MARINE CHEM,S-41296 GOTHENBURG,SWEDEN
关键词
D O I
10.1016/0967-0637(94)90005-1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Measurements of the carbonate system in the surface waters of the northeast Atlantic during summer 1991, following the main growth phase of a bloom of the coccolithophore Emiliania huxleyi are presented. We examine the perturbation of the carbonate system and assess the effect of calcification on the air-sea gradient of dissolved carbon dioxide in the surface ocean. An estimate of 1:1 organic to inorganic carbon uptake is calculated using the measurements of the surface carbonate parameters which is consistent with other estimates for E. huxleyi populations using radio-tracer methods. Using the changing ratio of dissolved carbon dioxide to nitrate concentration we demonstrate a relative increase in dissolved carbon dioxide due to calcification with evidence of this increase supported by estimates of the buffer factor and C:N assimilation ratios. Within the E. huxleyi bloom the effect of calcification on alkalinity appears to have reduced the air-sea gradient by approximately 15 muatms (corrected to a constant temperature) using measurements from a 440 km section along the 20-degrees-W meridian. This reduction could prove to be significant in terms of the overall drawdown of carbon during the spring-summer season in this area.
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页码:297 / &
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