Pućko, Monika; Stern, Gary A; Macdonald, Robie W; Rosenberg, B; Barber, David G (2011): Physical properties and alpha-/gamma-HCH concentrations in sea-ice and snow samples obtained during a CCGS Amundsen cruise, eastern Beaufort Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818648, Supplement to: Pućko, M et al. (2011): The influence of the atmosphere-snow-ice-ocean interactions on the levels of hexachlorocyclohexanes in the Arctic cryosphere. Journal of Geophysical Research, 116(C2), C02035, https://doi.org/10.1029/2010JC006614
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Abstract:
The alpha- and gamma-hexachlorocyclohexanes (HCHs) are being scavenged from the atmosphere by falling snow, with the average total scavenging ratios (WT) of 3.8 x 10**4 and 9.6 x 10**3, respectively. After deposition, HCH snow concentrations can decrease by 40% because of snowpack ventilation and increase by 50% because of upward migration of brine from the ice. HCH vertical distribution in sufficiently cold winter sea ice, which maintains brine volume fractions <5%, reflects the ice growth history. Initially, the entrapment of brine (and HCHs) in ice depends on the rates of ice growth and desalination. However, after approximately the first week of ice formation, ice growth rate becomes dominant. Deviations of HCH concentrations from the values predicted by the ice bulk salinity (rate of brine entrapment) can be explained by spatial variability of HCHs in surface water. HCH burden in the majority of the ice column remains locked throughout most of the season until the early spring when snow meltwater percolates into the ice, delivering HCHs to the upper ocean via desalination by flushing. Percolation can lead to an increase in alpha- and gamma-HCH in the sea ice by up to 2%-18% and 4%-32%, respectively.
Project(s):
Coverage:
Median Latitude: 70.981900 * Median Longitude: -125.144844 * South-bound Latitude: 69.868000 * West-bound Longitude: -127.704000 * North-bound Latitude: 71.739000 * East-bound Longitude: -122.963000
Date/Time Start: 2007-10-27T00:00:00 * Date/Time End: 2008-01-11T00:00:00
Comment:
Part of the IPY Circumpolar Flaw Lead (CFL) System Study. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Pućko, M; Stern, GA; Macdonald, RW et al. (2011): (Table 4) Physical properties in different layers of sea-ice, Beaufort Sea. https://doi.org/10.1594/PANGAEA.818647
- Pućko, M; Stern, GA; Macdonald, RW et al. (2011): (Table 1) Physical properties and alpha- and gamma-Hexachlorocyclohexane concentrations in sea-ice and snow samples, eastern Beaufort Sea. https://doi.org/10.1594/PANGAEA.818646