Year: 2016
Type: article
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 (pCO2) 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 pCO2 anomaly and more/less CO2 outgassing. It is argued that DIC‐driven effects on pCO2 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.
DOI: 10.1002/2016jc011714
Institutions: Massachusetts Institute of Technology, Institute of Arctic and Alpine Research, University of Colorado Boulder, National Oceanic and Atmospheric Administration, Cooperative Institute for Research in Environmental Sciences, NOAA Earth System Research Laboratory, Woods Hole Oceanographic Institution
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
Awards: GEOCHEMICAL ESTIMATES OF NEW PRODUCTION SURPASS THE APPARENT RATE OF NUTRIENT SUPPLY BY VERTICAL MIXING BY A FACTOR OF TWO OR MORE IN SUBTROPICAL OCE, Collaborative Research: High-Resolution Underway Air-Sea Observations in Drake Passage for Climate Science, Ocean carbon reservoirs and the air-sea flux of CO2 in a changing climate
OpenAlex ID: W2508917677