Seasonal velocities of eight major marine-terminating outlet glaciers of the Greenland ice sheet from continuous in situ GPS instruments

A.P. Ahlstrøm, S.B. Andersen, M.L. Andersen, H. Machguth, F.M. Nick, I. Joughin, C.H. Reijmer, R.S.W. van de Wal, J.P. Merryman Boncori, J.E. Box, M. Citterio, D. van As, R.S. Fausto, A. Hubbard

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

29 Citationer (Scopus)

Abstrakt

We present 17 velocity records derived from in situ stand-alone single-frequency Global Positioning System (GPS) receivers placed on eight marine-terminating ice sheet outlet glaciers in South, West and North Greenland, covering varying parts of the period summer 2009 to summer 2012. Common to all the observed glacier velocity records is a pronounced seasonal variation, with an early melt season maximum generally followed by a rapid mid-melt season deceleration. The GPS-derived velocities are compared to velocities derived from radar satellite imagery over six of the glaciers to illustrate the potential of the GPS data for validation purposes. Three different velocity map products are evaluated, based on ALOS/PALSAR data, TerraSAR-X/Tandem-X data and an aggregate winter TerraSAR-X data set. The velocity maps derived from TerraSAR-X/Tandem-X data have a mean difference of 1.5% compared to the mean GPS velocity over the corresponding period, while velocity maps derived from ALOS/PALSAR data have a mean difference of 9.7%. The velocity maps derived from the aggregate winter TerraSAR-X data set have a mean difference of 9.5% to the corresponding GPS velocities. The data are available from the GEUS repository at doi:10.5280/GEUS000001.

OriginalsprogEngelsk
Sider (fra-til)277-287
Antal sider11
TidsskriftEarth System Science Data
Vol/bind5
Udgave nummer2
DOI
StatusUdgivet - 30 jul. 2013

Programområde

  • Programområde 5: Natur og klima

Fingeraftryk

Dyk ned i forskningsemnerne om 'Seasonal velocities of eight major marine-terminating outlet glaciers of the Greenland ice sheet from continuous in situ GPS instruments'. Sammen danner de et unikt fingeraftryk.

Citationsformater