Noble gas signatures in Greenland : tracing glacial meltwater sources
Castro, M. Clara
Aciego, Sarah M.
Hall, Chris M.
Stevenson, Emily I.
Arendt, Carli A.
Das, Sarah B.
MetadataShow full item record
This study represents the first comprehensive noble gas study in glacial meltwater from the Greenland Ice Sheet. It shows that most samples are in disequilibrium with surface collection conditions. A preliminary Ne and Xe analysis suggests that about half of the samples equilibrated at a temperature of ~0°C and altitudes between 1000 m and 2000 m, with a few samples pointing to lower equilibration altitudes and temperatures between 2°C and 5°C. Two samples suggest an origin as melted ice and complete lack of equilibration with surface conditions. A helium component analysis suggests that this glacial meltwater was isolated from the atmosphere prior to the 1950s, with most samples yielding residence times ≤ 420 years. Most samples represent a mixture between a dominant atmospheric component originating as precipitation and basal meltwater or groundwater, which has accumulated crustal 4He over time.
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 9311–9318, doi:10.1002/2015GL065778.
Suggested CitationArticle: Niu, Yi, Castro, M. Clara, Aciego, Sarah M., Hall, Chris M., Stevenson, Emily I., Arendt, Carli A., Das, Sarah B., "Noble gas signatures in Greenland : tracing glacial meltwater sources", Geophysical Research Letters 42 (2015): 9311–9318, DOI:10.1002/2015GL065778, https://hdl.handle.net/1912/7798
Showing items related by title, author, creator and subject.
Iceberg meltwater fluxes dominate the freshwater budget in Greenland's iceberg-congested glacial fjords Enderlin, Ellyn; Hamilton, Gordon S.; Straneo, Fiamma; Sutherland, David A. (John Wiley & Sons, 2016-11-09)Freshwater fluxes from the Greenland ice sheet have increased over the last two decades due to increases in liquid (i.e., surface and submarine meltwater) and solid ice (i.e., iceberg) fluxes. To predict potential ice ...
Beaird, Nicholas; Straneo, Fiamma; Jenkins, William J. (John Wiley & Sons, 2015-09-30)We present the first noble gas observations in a proglacial fjord in Greenland, providing an unprecedented view of surface and submarine melt pathways into the ocean. Using Optimum Multiparameter Analysis, noble gas ...
Stevens, Laura A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-09)Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production ...