Rutgers van der Loeff, Michiel M; Cassar, Nicolas; Nicolaus, Marcel; Rabe, Benjamin; Stimac, Ingrid (2014): Radon 222 and Radium 226 measured on water bottle samples during POLARSTERN cruise ARK-XXVI/3 (TransArc) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.823179, Supplement to: Rutgers van der Loeff, MM et al. (2014): The influence of sea ice cover on air-sea gas exchange estimated with radon-222 profiles. Journal of Geophysical Research: Oceans, 119(5), 2735-2751, https://doi.org/10.1002/2013JC009321
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Air-sea gas exchange plays a key role in the cycling of greenhouse and other biogeochemically important gases. Although air-sea gas transfer is expected to change as a consequence of the rapid decline in summer Arctic sea ice cover, little is known about the effect of sea ice cover on gas exchange fluxes, especially in the marginal ice zone. During the Polarstern expedition ARK-XXVI/3 (TransArc, August/September 2011) to the central Arctic Ocean, we compared 222Rn/226Ra ratios in the upper 50 m of 14 ice-covered and 4 ice-free stations. At three of the ice-free stations, we find 222Rn-based gas transfer coefficients in good agreement with expectation based on published relationships between gas transfer and wind speed over open water when accounting for wind history from wind reanalysis data. We hypothesize that the low gas transfer rate at the fourth station results from reduced fetch due to the proximity of the ice edge, or lateral exchange across the front at the ice edge by restratification. No significant radon deficit could be observed at the ice-covered stations. At these stations, the average gas transfer velocity was less than 0.1 m/d (97.5% confidence), compared to 0.5-2.2 m/d expected for open water. Our results show that air-sea gas exchange in an ice-covered ocean is reduced by at least an order of magnitude compared to open water. In contrast to previous studies, we show that in partially ice-covered regions, gas exchange is lower than expected based on a linear scaling to percent ice cover.
Project(s):
Marine Geochemistry @ AWI (AWI_MarGeoChem)
Coverage:
Median Latitude: 84.383477 * Median Longitude: 138.579227 * South-bound Latitude: 78.493500 * West-bound Longitude: 58.974830 * North-bound Latitude: 89.965330 * East-bound Longitude: -128.323500
Date/Time Start: 2011-08-13T18:48:00 * Date/Time End: 2011-09-22T13:41:00
Minimum DEPTH, water: 1 m * Maximum DEPTH, water: 50 m
Event(s):
PS78/201-5 * Latitude Start: 85.519500 * Longitude Start: 59.682500 * Latitude End: 85.519500 * Longitude End: 59.682500 * Date/Time Start: 2011-08-13T18:48:00 * Date/Time End: 2011-08-13T18:48:00 * Elevation Start: -3784.0 m * Elevation End: -3784.0 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Method/Device: Water Multi Sampler (MUWS)
PS78/205-3 * Latitude Start: 86.328670 * Longitude Start: 59.289500 * Latitude End: 86.328670 * Longitude End: 59.290170 * Date/Time Start: 2011-08-15T15:01:00 * Date/Time End: 2011-08-15T15:02:00 * Elevation Start: -2112.3 m * Elevation End: -2114.0 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Method/Device: Water Multi Sampler (MUWS)
PS78/209-6 * Latitude Start: 86.982170 * Longitude Start: 58.974830 * Latitude End: 86.982500 * Longitude End: 59.007170 * Date/Time Start: 2011-08-17T19:31:00 * Date/Time End: 2011-08-17T19:48:00 * Elevation Start: -4636.4 m * Elevation End: -4617.4 m * Location: Arctic Ocean * Campaign: ARK-XXVI/3 (PS78 TransArc) * Basis: Polarstern * Method/Device: Water Multi Sampler (MUWS)
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
703 data points