Do hurricanes cause significant interannual variability in the air-sea CO2flux of the subtropical North Atlantic?

Details Do hurricanes cause significant interannual variability in the air-sea CO2flux of the subtropical North Atlantic? Do hurricanes cause significant interannual variability in the air-sea CO2flux of the subtropical North Atlantic?

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3607606k&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 7, CiteID L07606

Mathematics

Logic

3

Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Carbon Cycling (0428), Oceanography: General: Physical And Biogeochemical Interactions, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Observations at Bermuda and in the Caribbean Sea indicate that hurricanes influence surface ocean pCO2 (pCO2 ocean) and air-sea CO2 fluxes at short time scales. We use a regional version of the MIT ocean general circulation model to study impacts on interannual variability in air-sea CO2 fluxes in the North Atlantic subtropical gyre (25-40N). Consistent with observations, enhanced wind speeds dominate the hurricane's effect on the flux, driving CO2 out of the ocean due to the negative air-sea gradient in pCO2 (pCO2 atm < pCO2 ocean) that occurs in response to warm sea surface temperatures (SSTs) during hurricane season. With a storm, vertical mixing causes negative SST anomalies that depress pCO2 ocean, but not enough to reverse the gradient. Though hurricanes drive a substantial local CO2 efflux, we find no evidence for a relationship between year-to-year variability in hurricane frequency and variability in basin-integrated air-sea CO2 fluxes across the subtropical North Atlantic.

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