Direct determination of the air‐sea CO2 gas transfer velocity in Arctic sea ice regions
Abstract
The Arctic Ocean is an important sink for atmospheric CO2. The impact of decreasing sea ice extent and expanding marginal ice zones on Arctic air‐sea CO2 exchange depends on the rate of gas transfer in the presence of sea ice. Sea ice acts to limit air‐sea gas exchange by reducing contact between air and water but is also hypothesized to enhance gas transfer rates across surrounding open‐water surfaces through physical processes such as increased surface‐ocean turbulence from ice‐water shear and ice‐edge form drag. Here we present the first direct determination of the CO2 air‐sea gas transfer velocity in a wide range of Arctic sea ice conditions. We show that the gas transfer velocity increases near linearly with decreasing sea ice concentration. We also show that previous modeling approaches overestimate gas transfer rates in sea ice regions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 24, 2017
- Source ID
- 10.1002/2017gl073593
Entities
People
- Brett F Thornton
- Christoph Humborg
- Dominic J. Salisbury
- Ian M. Brooks
- John Prytherch
- Leif G. Anderson
- Marc C. Geibel
- Michael Tjernström
- Patrick M. Crill
Organizations
- Bolin Centre for Climate Research
- Knut and Alice Wallenberg Foundation
- National Oceanic and Atmospheric Administration
- Stockholm University
- Swedish Research Council
- University of Gothenburg
- University of Leeds