Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: insights from MERRA-2

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dc.contributor.authorLim, Young-Kwon
dc.contributor.authorSchubert, Siegfried D.
dc.contributor.authorNowicki, Sophie M. J.
dc.contributor.authorLee, Jae N.
dc.contributor.authorMolod, Andrea M.
dc.contributor.authorCullather, Richard I.
dc.contributor.authorZhao, Bin
dc.contributor.authorVelicogna, Isabella
dc.date.accessioned2023-07-11T21:40:29Z
dc.date.available2023-07-11T21:40:29Z
dc.date.issued2016-02-01
dc.description.abstractThe relationship between leading atmospheric teleconnection patterns and Greenland Ice Sheet (GrIS) temperature, precipitation, and surface mass balance (SMB) are investigated for the last 36 summers (1979–2014) based on Modern-Era Retrospective analysis for Research and Applications version 2 reanalyses. The results indicate that the negative phase of both the North Atlantic Oscillation (NAO) and Arctic Oscillation, associated with warm and dry conditions for the GrIS, lead to SMB decreases within 0–1 months. Furthermore, the positive phase of the East Atlantic (EA) pattern often lags the negative NAO, reflecting a dynamical linkage between these modes that acts to further enhance the warm and dry conditions over the GrIS, leading to a favorable environment for enhanced surface mass loss. The development of a strong negative NAO in combination with a strong positive EA in recent years leads to significantly larger GrIS warming compared to when the negative NAO occurs in combination with a negative or weak positive EA (0.69 K versus 0.13 K anomaly). During 2009 and 2011, weakened (as compared to conditions during the severe surface melt cases of 2010 and 2012) local high pressure blocking produced colder northerly flow over the GrIS inhibiting warming despite the occurrence of a strong negative NAO, reflecting an important role for the EA during those years. In particular, the EA acts with the NAO to enhance warming in 2010 and 2012, and weaken high pressure blocking in 2009 and 2011. In general, high pressure blocking primarily impacts the western areas of the GrIS via advective temperature increases, while changes in net surface radiative fluxes account for both western and eastern GrIS temperature changes.en_US
dc.description.sponsorshipERA-I fields were obtained from the online ordering system of the European Centre for Medium-Range Weather Forecasts. GPCP, CERES-EBAF, and MERRA-2 were obtained from the distributed active archive center at NASA Goddard Space Flight Center. The authors thank the anonymous reviewers for their constructive comments in the revision of the manuscript. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Center for Climate Simulation (NCCS) at Goddard Space Flight Center. This study was funded by a grant from the NASA Interdisciplinary Research (IDS) titled 'Feedbacks, Processes and Impacts of Contemporary Changes in the Arctic' to the third author.en_US
dc.description.urihttps://iopscience.iop.org/article/10.1088/1748-9326/11/2/024002en_US
dc.format.extent12 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m272v9-utmw
dc.identifier.citationLim, Young-Kwon et al. "Atmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: insights from MERRA-2." Environmental Research Letters 11, no. 2 (1 February 2016). https://doi.org/10.1088/1748-9326/11/2/024002en_US
dc.identifier.urihttps://doi.org/10.1088/1748-9326/11/2/024002
dc.identifier.urihttp://hdl.handle.net/11603/28607
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
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.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleAtmospheric summer teleconnections and Greenland Ice Sheet surface mass variations: insights from MERRA-2en_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9814-9855en_US

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