Variations of f CO 2 and air-sea flux of CO 2 in the Greenland Sea gyre using high-frequency time series data from CARIOCA drift buoys
International audience A 6 month, high-frequency (hourly) time series of f CO 2 and sea surface temperature measured by CARIOCA drift buoys in the Greenland Sea gyre is presented. The f CO 2 shows the effects of photosynthetic activity in the summer, with f CO 2 values as low as 260 μatm, followed b...
| Published in: | Journal of Geophysical Research: Oceans |
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| Main Authors: | , , |
| Other Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
HAL CCSD
1999
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| Subjects: | |
| Online Access: | https://hal.science/hal-00772187 https://doi.org/10.1029/1999JC900130 |
| Summary: | International audience A 6 month, high-frequency (hourly) time series of f CO 2 and sea surface temperature measured by CARIOCA drift buoys in the Greenland Sea gyre is presented. The f CO 2 shows the effects of photosynthetic activity in the summer, with f CO 2 values as low as 260 μatm, followed by an increase to approximately 310 μatm in the late fall and winter due to mixing with CO 2 -rich deep water from below, remineralization, and gas exchange. The time series shows that f CO 2 in the Greenland Sea gyre is undersaturated with respect to the atmosphere year-round, having an average Δ f CO 2 of -71 μatm. Linear correlations between the measured f CO 2 normalized to a constant temperature of -1°C and sea surface temperature (SST) are used to construct high-resolution f CO 2 and air-sea CO 2 flux maps for the Greenland Sea gyre area using SST and wind speed data from the European Center for Medium-Range Weather Forecasting and ice information from the Special Sensor Microwave/Imager on a 0.5°×0.5° grid. The CO 2 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 × 10 12 g C yr -1 depending on the gas exchange parameterization used. |
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