Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series
As the global climate changes, understanding short-term variations in water storage is increasingly important. Continuously operating Global Positioning System (cGPS) stations in Iceland record annual periodic motion—the elastic response to winter accumulation and spring melt seasons—with peak-to-pe...
Published in: | Geochemistry, Geophysics, Geosystems |
---|---|
Main Authors: | , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/11576/2647536 https://doi.org/10.1002/2017GC006831 http://onlinelibrary.wiley.com/doi/10.1002/2017GC006831/full |
id |
ftunivurbino:oai:ora.uniurb.it:11576/2647536 |
---|---|
record_format |
openpolar |
spelling |
ftunivurbino:oai:ora.uniurb.it:11576/2647536 2024-04-21T08:04:38+00:00 Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina SPADA, GIORGIO Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina Spada, Giorgio 2017 STAMPA http://hdl.handle.net/11576/2647536 https://doi.org/10.1002/2017GC006831 http://onlinelibrary.wiley.com/doi/10.1002/2017GC006831/full eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000405585000005 volume:N/A issue:N/A firstpage:N/A lastpage:N/A numberofpages:21 journal:GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS http://hdl.handle.net/11576/2647536 doi:10.1002/2017GC006831 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85020685238 http://onlinelibrary.wiley.com/doi/10.1002/2017GC006831/full Key Points: cGPS may be used as a low-cost ice mass balance measurement tool in Iceland cGPS-derived ice mass variation time series reproduce interannual variability in precipitation and melting Increased temporal resolution allows for better characterization of ice cap response following volcanic eruptions C info:eu-repo/semantics/article 2017 ftunivurbino https://doi.org/10.1002/2017GC006831 2024-03-28T01:08:21Z As the global climate changes, understanding short-term variations in water storage is increasingly important. Continuously operating Global Positioning System (cGPS) stations in Iceland record annual periodic motion—the elastic response to winter accumulation and spring melt seasons—with peak-to-peak vertical amplitudes over 20 mm for those sites in the Central Highlands. Here for the first time for Iceland, we demonstrate the utility of these cGPS-measured displacements for estimating seasonal and shorter-term ice cap mass changes. We calculate unit responses to each of the five largest ice caps in central Iceland at each of the 62 cGPS locations using an elastic half-space model and estimate ice mass variations from the cGPS time series using a simple least squares inversion scheme. We utilize all three components of motion, taking advantage of the seasonal motion recorded in the horizontal. We remove secular velocities and accelerations and explore the impact that seasonal motions due to atmospheric, hydrologic, and nontidal ocean loading have on our inversion results. Our results match available summer and winter mass balance measurements well, and we reproduce the seasonal stake-based observations of loading and melting within the 1 math formula confidence bounds of the inversion. We identify nonperiodic ice mass changes associated with interannual variability in precipitation and other processes such as increased melting due to reduced ice surface albedo or decreased melting due to ice cap insulation in response to tephra deposition following volcanic eruptions, processes that are not resolved with once or twice-yearly stake measurements. Article in Journal/Newspaper Ice cap Iceland Università degli Studi di Urbino: CINECA IRIS Geochemistry, Geophysics, Geosystems 18 6 2099 2119 |
institution |
Open Polar |
collection |
Università degli Studi di Urbino: CINECA IRIS |
op_collection_id |
ftunivurbino |
language |
English |
topic |
Key Points: cGPS may be used as a low-cost ice mass balance measurement tool in Iceland cGPS-derived ice mass variation time series reproduce interannual variability in precipitation and melting Increased temporal resolution allows for better characterization of ice cap response following volcanic eruptions C |
spellingShingle |
Key Points: cGPS may be used as a low-cost ice mass balance measurement tool in Iceland cGPS-derived ice mass variation time series reproduce interannual variability in precipitation and melting Increased temporal resolution allows for better characterization of ice cap response following volcanic eruptions C Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina SPADA, GIORGIO Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
topic_facet |
Key Points: cGPS may be used as a low-cost ice mass balance measurement tool in Iceland cGPS-derived ice mass variation time series reproduce interannual variability in precipitation and melting Increased temporal resolution allows for better characterization of ice cap response following volcanic eruptions C |
description |
As the global climate changes, understanding short-term variations in water storage is increasingly important. Continuously operating Global Positioning System (cGPS) stations in Iceland record annual periodic motion—the elastic response to winter accumulation and spring melt seasons—with peak-to-peak vertical amplitudes over 20 mm for those sites in the Central Highlands. Here for the first time for Iceland, we demonstrate the utility of these cGPS-measured displacements for estimating seasonal and shorter-term ice cap mass changes. We calculate unit responses to each of the five largest ice caps in central Iceland at each of the 62 cGPS locations using an elastic half-space model and estimate ice mass variations from the cGPS time series using a simple least squares inversion scheme. We utilize all three components of motion, taking advantage of the seasonal motion recorded in the horizontal. We remove secular velocities and accelerations and explore the impact that seasonal motions due to atmospheric, hydrologic, and nontidal ocean loading have on our inversion results. Our results match available summer and winter mass balance measurements well, and we reproduce the seasonal stake-based observations of loading and melting within the 1 math formula confidence bounds of the inversion. We identify nonperiodic ice mass changes associated with interannual variability in precipitation and other processes such as increased melting due to reduced ice surface albedo or decreased melting due to ice cap insulation in response to tephra deposition following volcanic eruptions, processes that are not resolved with once or twice-yearly stake measurements. |
author2 |
Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina Spada, Giorgio |
format |
Article in Journal/Newspaper |
author |
Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina SPADA, GIORGIO |
author_facet |
Compton, Kathleen Bennett, Richard A. Hreinsdóttir, Sigrún van Dam, Tonie Bordoni, Andrea Barletta, Valentina SPADA, GIORGIO |
author_sort |
Compton, Kathleen |
title |
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
title_short |
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
title_full |
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
title_fullStr |
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
title_full_unstemmed |
Short-term variations of Icelandic ice cap mass inferred from cGPS coordinate time series |
title_sort |
short-term variations of icelandic ice cap mass inferred from cgps coordinate time series |
publishDate |
2017 |
url |
http://hdl.handle.net/11576/2647536 https://doi.org/10.1002/2017GC006831 http://onlinelibrary.wiley.com/doi/10.1002/2017GC006831/full |
genre |
Ice cap Iceland |
genre_facet |
Ice cap Iceland |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000405585000005 volume:N/A issue:N/A firstpage:N/A lastpage:N/A numberofpages:21 journal:GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS http://hdl.handle.net/11576/2647536 doi:10.1002/2017GC006831 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85020685238 http://onlinelibrary.wiley.com/doi/10.1002/2017GC006831/full |
op_doi |
https://doi.org/10.1002/2017GC006831 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
18 |
container_issue |
6 |
container_start_page |
2099 |
op_container_end_page |
2119 |
_version_ |
1796944186163855360 |