Temperature history and accumulation timing for the snowpack at GISP2, central Greenland

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dc.contributor.authorShuman, Christopher
dc.contributor.authorAlley, R. B.
dc.contributor.authorFahnestock, M. A.
dc.contributor.authorBindschadler, R. A.
dc.contributor.authorWhite, J. W. C.
dc.contributor.authorWinterle, J.
dc.contributor.authorMconnell, J. R.
dc.date.accessioned2022-02-22T13:43:59Z
dc.date.available2022-02-22T13:43:59Z
dc.date.issued2017-01-20
dc.description.abstractPrevious research has documented a close association between high-resolution snow-pit profiles of hydrogen and oxygen stable-isotope ratios and multi-year Special Sensor Microwave/lmager (SSM/I) 37 GHz brightness temperature data in central Greenland. Comparison of the SSM/I data to profiles obtained during the 1989-91 field seasons indicated that δD and δ ¹⁸O data from the near-surface snow at the Greenland summit are a reliable, high-resolution temperature proxy. To test this new technique further, additional stable-isotope data were obtained from a 2 m snow pit constructed during late-June 1995 near the GISP2 site. This new profile, supported by pit stratigraphy and chemistry data, confirms the utility of comparing stable-isotope records with SSM/I brightness temperatures. The sub-annual variation of the δD record at the GISP2 site was determined using 15 match points, from approximately December 1991 through June 1995 and was guided in part by time-constrained hoar layers. The close association of these temperature proxies supports the assertion that snow accumulation occurs frequently through the year and that the isotope record initially contains temperature information from many times of the year. This is also independently confirmed by analysis of H₂O₂ data. The slope of the multi-year T vs δ correlation was evaluated along with the sub-annual variation in the amount, rate and timing of accumulation. These new results are consistent with those from the previous study and they also demonstrate that the snow in this area initially contains temperature and chemical records with sub-annual resolution. This encourages confident interpretation of the paleoclimatic signal variations in the GISP2 and GRIP deep cores.en_US
dc.description.sponsorshipWe thank the Science Management Office, Polar Ice Coring Office, and 109th Air National Guard for logistical support, as well as D. Meese, C. Jung, II, G. Landis, M. Sturm, two helpful reviewers, and other GISP2 colleagues for their technical support. This research was supported by the U.S. National Science Foundation and NASA. This work was begun while the first author held a U.S. National Research Council Associateship at NASA/Goddard Space Flight Center, and concluded during an appointment with the Universities Space Research Association at NASA/Goddard Space Flight Center (Contract No. NAS5-32484).en_US
dc.description.urihttps://www.cambridge.org/core/journals/journal-of-glaciology/article/temperature-history-and-accumulation-timing-for-the-snowpack-at-gisp2-central-greenland/A809AE14C51E9BFA45AD26820A31460Cen_US
dc.format.extent10 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2gowv-7beo
dc.identifier.citationShuman, C. A., R. B. Alley, M. A. Fahnestock, R. A. Bindschadler, J. W. C. White, J. Winterle, and J. R. Mconnell. 1998. “Temperature History and Accumulation Timing for the Snowpack at GISP2, Central Greenland.” Journal of Glaciology 44 (146). Cambridge University Press: 21–30. doi:10.3189/S0022143000002318.en_US
dc.identifier.urihttps://doi.org/10.3189/S0022143000002318
dc.identifier.urihttp://hdl.handle.net/11603/24303
dc.language.isoen_USen_US
dc.publisherCambridge University Pressen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleTemperature history and accumulation timing for the snowpack at GISP2, central Greenlanden_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9606-767Xen_US

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