Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability
The response of grounded ice sheets to a changing climate critically influences possible future changes in sea level. Recent satellite surveys over southern Greenland show little overall elevation change at higher elevations, but large spatial variability. Using satellite studies alone, it is not po...
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| Veröffentlicht in: | Nature (London) 2000-08, Vol.406 (6798), p.877-879 |
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| creator | McConnell, J. R Arthern, R. J Mosley-Thompson, E Davis, C. H Bales, R. C Thomas, R Burkhart, J. F Kyne, J. D |
| description | The response of grounded ice sheets to a changing climate critically influences
possible future changes in sea level. Recent satellite surveys over southern
Greenland show little overall elevation change at higher elevations, but large
spatial variability. Using satellite studies alone, it
is not possible to determine the geophysical processes responsible for the
observed elevation changes and to decide if recent rates of change exceed
the natural variability. Here we derive changes in ice-sheet elevation in
southern Greenland, for the years 1978-88, using a physically based
model of firn densification and records of annual snow accumulation
reconstructed from 12 ice cores at high elevation. Our patterns of accumulation-driven
elevation change agree closely with contemporaneous satellite measurements
of ice-sheet elevation change, and we therefore attribute the changes observed
in 1978-88 to variability in snow accumulation. Similar analyses of
longer ice-core records show that in this decade the Greenland ice sheet exhibited
typical variability at high elevations, well within the long-term natural
variability. Our results indicate that a better understanding of ice-sheet
mass changes will require long-term measurements of both surface elevation
and snow accumulation. |
| doi_str_mv | 10.1038/35022555 |
| format | Article |
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possible future changes in sea level. Recent satellite surveys over southern
Greenland show little overall elevation change at higher elevations, but large
spatial variability. Using satellite studies alone, it
is not possible to determine the geophysical processes responsible for the
observed elevation changes and to decide if recent rates of change exceed
the natural variability. Here we derive changes in ice-sheet elevation in
southern Greenland, for the years 1978-88, using a physically based
model of firn densification and records of annual snow accumulation
reconstructed from 12 ice cores at high elevation. Our patterns of accumulation-driven
elevation change agree closely with contemporaneous satellite measurements
of ice-sheet elevation change, and we therefore attribute the changes observed
in 1978-88 to variability in snow accumulation. Similar analyses of
longer ice-core records show that in this decade the Greenland ice sheet exhibited
typical variability at high elevations, well within the long-term natural
variability. Our results indicate that a better understanding of ice-sheet
mass changes will require long-term measurements of both surface elevation
and snow accumulation.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/35022555</identifier><identifier>PMID: 10972286</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Climate ; Climate change ; Densification ; Earth, ocean, space ; Elevation ; Exact sciences and technology ; External geophysics ; Firn ; Geology ; Geophysics ; Greenland ; Humanities and Social Sciences ; Ice ; letter ; Marine ; multidisciplinary ; Satellites ; Science ; Science (multidisciplinary) ; Sea level ; Sea level changes ; Snow accumulation ; Snow. Ice. Glaciers ; Surveys ; Variability</subject><ispartof>Nature (London), 2000-08, Vol.406 (6798), p.877-879</ispartof><rights>Macmillan Magazines Ltd. 2000</rights><rights>2000 INIST-CNRS</rights><rights>COPYRIGHT 2000 Nature Publishing Group</rights><rights>Copyright Macmillan Journals Ltd. Aug 24, 2000</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a712t-a4b22295876d16af74bee6da819b44bbdfd6beea68b43367b9e9d1b43ff2b2d33</citedby><cites>FETCH-LOGICAL-a712t-a4b22295876d16af74bee6da819b44bbdfd6beea68b43367b9e9d1b43ff2b2d33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/35022555$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/35022555$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,2725,27923,27924,41487,42556,51318</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1513498$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/10972286$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>McConnell, J. R</creatorcontrib><creatorcontrib>Arthern, R. J</creatorcontrib><creatorcontrib>Mosley-Thompson, E</creatorcontrib><creatorcontrib>Davis, C. H</creatorcontrib><creatorcontrib>Bales, R. C</creatorcontrib><creatorcontrib>Thomas, R</creatorcontrib><creatorcontrib>Burkhart, J. F</creatorcontrib><creatorcontrib>Kyne, J. D</creatorcontrib><title>Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability</title><title>Nature (London)</title><addtitle>Nature</addtitle><addtitle>Nature</addtitle><description>The response of grounded ice sheets to a changing climate critically influences
possible future changes in sea level. Recent satellite surveys over southern
Greenland show little overall elevation change at higher elevations, but large
spatial variability. Using satellite studies alone, it
is not possible to determine the geophysical processes responsible for the
observed elevation changes and to decide if recent rates of change exceed
the natural variability. Here we derive changes in ice-sheet elevation in
southern Greenland, for the years 1978-88, using a physically based
model of firn densification and records of annual snow accumulation
reconstructed from 12 ice cores at high elevation. Our patterns of accumulation-driven
elevation change agree closely with contemporaneous satellite measurements
of ice-sheet elevation change, and we therefore attribute the changes observed
in 1978-88 to variability in snow accumulation. Similar analyses of
longer ice-core records show that in this decade the Greenland ice sheet exhibited
typical variability at high elevations, well within the long-term natural
variability. Our results indicate that a better understanding of ice-sheet
mass changes will require long-term measurements of both surface elevation
and snow accumulation.</description><subject>Climate</subject><subject>Climate change</subject><subject>Densification</subject><subject>Earth, ocean, space</subject><subject>Elevation</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Firn</subject><subject>Geology</subject><subject>Geophysics</subject><subject>Greenland</subject><subject>Humanities and Social Sciences</subject><subject>Ice</subject><subject>letter</subject><subject>Marine</subject><subject>multidisciplinary</subject><subject>Satellites</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><subject>Sea level</subject><subject>Sea level changes</subject><subject>Snow accumulation</subject><subject>Snow. Ice. 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Glaciers</topic><topic>Surveys</topic><topic>Variability</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>McConnell, J. R</creatorcontrib><creatorcontrib>Arthern, R. J</creatorcontrib><creatorcontrib>Mosley-Thompson, E</creatorcontrib><creatorcontrib>Davis, C. H</creatorcontrib><creatorcontrib>Bales, R. C</creatorcontrib><creatorcontrib>Thomas, R</creatorcontrib><creatorcontrib>Burkhart, J. F</creatorcontrib><creatorcontrib>Kyne, J. 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R</au><au>Arthern, R. J</au><au>Mosley-Thompson, E</au><au>Davis, C. H</au><au>Bales, R. C</au><au>Thomas, R</au><au>Burkhart, J. F</au><au>Kyne, J. D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><addtitle>Nature</addtitle><date>2000-08-24</date><risdate>2000</risdate><volume>406</volume><issue>6798</issue><spage>877</spage><epage>879</epage><pages>877-879</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><coden>NATUAS</coden><abstract>The response of grounded ice sheets to a changing climate critically influences
possible future changes in sea level. Recent satellite surveys over southern
Greenland show little overall elevation change at higher elevations, but large
spatial variability. Using satellite studies alone, it
is not possible to determine the geophysical processes responsible for the
observed elevation changes and to decide if recent rates of change exceed
the natural variability. Here we derive changes in ice-sheet elevation in
southern Greenland, for the years 1978-88, using a physically based
model of firn densification and records of annual snow accumulation
reconstructed from 12 ice cores at high elevation. Our patterns of accumulation-driven
elevation change agree closely with contemporaneous satellite measurements
of ice-sheet elevation change, and we therefore attribute the changes observed
in 1978-88 to variability in snow accumulation. Similar analyses of
longer ice-core records show that in this decade the Greenland ice sheet exhibited
typical variability at high elevations, well within the long-term natural
variability. Our results indicate that a better understanding of ice-sheet
mass changes will require long-term measurements of both surface elevation
and snow accumulation.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>10972286</pmid><doi>10.1038/35022555</doi><tpages>3</tpages></addata></record> |
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| identifier | ISSN: 0028-0836 |
| ispartof | Nature (London), 2000-08, Vol.406 (6798), p.877-879 |
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| language | eng |
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| source | Nature Journals Online; SpringerLink Journals - AutoHoldings |
| subjects | Climate Climate change Densification Earth, ocean, space Elevation Exact sciences and technology External geophysics Firn Geology Geophysics Greenland Humanities and Social Sciences Ice letter Marine multidisciplinary Satellites Science Science (multidisciplinary) Sea level Sea level changes Snow accumulation Snow. Ice. Glaciers Surveys Variability |
| title | Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability |
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