Variations of fCO2 and air-sea flux of CO2 in the Greenland Sea gyre using high-frequency time series data from CARIOCA drift buoys

被引:45
作者
Hood, EM
Merlivat, L
Johannessen, T
机构
[1] Univ Paris 06, Lab Oceanog Dynam & Climatol, ORSTOM, CNRSUMR 7617, F-75252 Paris 05, France
[2] Univ Bergen, Inst Geophys, N-5007 Bergen, Norway
关键词
D O I
10.1029/1999JC900130
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
A 6 month, high-frequency (hourly) time series of fCO(2) and sea surface temperature measured by CARIOCA drift buoys in the Greenland Sea gyre is presented. The fCO(2) shows the effects of photosynthetic activity in the summer, with fCO(2) values as low as 260 mu atm, followed by an increase to approximately 310 mu atm in the late fall and winter due to mixing with CO2 - rich deep water from below, remineralization, and gas exchange. The time series shows that fCO(2) in the Greenland Sea gyre is undersaturated with respect to the atmosphere year-round, having an average Delta fCO(2) of -71 mu atm. Linear correlations between the measured fCO(2) normalized to a constant temperature of -1 degrees C and sea surface temperature (SST) are used to construct high-resolution fCO(2) and air-sea CO2 flux maps for the Greenland Sea gyre area using SST and wind speed data from the European Centre for Medium-Range Weather Forecasting and ice information from the Special Sensor Microwave/Imager on a 0.5 degrees x 0.5 degrees grid. The CO2 flux for the Greenland Sea gyre calculated for 1996-1997 considering the effects of blockage of gas exchange by sea ice is estimated to be -2.4 to -4.2 x 10(12) g C y(-1) depending on the gas exchange parameterization used.
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页码:20571 / 20583
页数:13
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