Mesoscale modulation of air-sea CO2 flux in Drake Passage
| Type | Article | ||||||||
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| Date | 2016-09 | ||||||||
| Language | English | ||||||||
| Author(s) | Song Hajoon1, Marshall John1, Munro David R.2, 3, Dutkiewicz Stephanie1, Sweeney Colm4, 5, McGillicuddy D. J., Jr.6, Hausmann Ute6 | ||||||||
| Affiliation(s) | 1 : MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA. 2 : Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA. 3 : Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA. 4 : Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA. 5 : NOAA, Earth Syst Res Lab, Boulder, CO USA. 6 : Woods Hole Oceanog Inst, Dept Appl Ocean Phys & Engn, Woods Hole, MA 02543 USA. |
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| Source | Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2016-09 , Vol. 121 , N. 9 , P. 6635-6649 | ||||||||
| DOI | 10.1002/2016JC011714 | ||||||||
| WOS© Times Cited | 22 | ||||||||
| Keyword(s) | CO2 flux, mesoscale eddy, Southern Ocean, vertical mixing, nutrient fluxes | ||||||||
| Abstract | We investigate the role of mesoscale eddies in modulating air-sea CO2 flux and associated biogeochemical fields in Drake Passage using in situ observations and an eddy-resolving numerical model. Both observations and model show a negative correlation between temperature and partial pressure of CO2 (pCO(2)) anomalies at the sea surface in austral summer, indicating that warm/cold anticyclonic/cyclonic eddies take up more/less CO2. In austral winter, in contrast, relationships are reversed: warm/cold anticyclonic/cyclonic eddies are characterized by a positive/negative pCO(2) anomaly and more/less CO2 outgassing. It is argued that DIC-driven effects on pCO(2) are greater than temperature effects in austral summer, leading to a negative correlation. In austral winter, however, the reverse is true. An eddy-centric analysis of the model solution reveals that nitrate and iron respond differently to the same vertical mixing: vertical mixing has a greater impact on iron because its normalized vertical gradient at the base of the surface mixed layer is an order of magnitude greater than that of nitrate. | ||||||||
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