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

• Published in: Journal of Geophysical Research: Oceans
• Main Authors: Hood, E. M., Merlivat, Liliane, Johannessen, T.
• Other Authors: Laboratoire d'océanographie dynamique et de climatologie (LODYC), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1999
• Subjects: [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]; [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; [SDE.MCG]Environmental Sciences/Global Changes; Greenland; Greenland Sea; Sea ice
• Online Access: https://hal.science/hal-00772187; https://doi.org/10.1029/1999JC900130

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.