The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf
Ross Ice Shelf (RIS) is known to experience transient thickness change due to changes in the flow of its tributary ice streams and glaciers and this may complicate identification of external, climate-forced signals in contemporary observations of ice shelf thinning and thickening. Flux changes at th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2017-04-01
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| Series: | Annals of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0260305517000167/type/journal_article |
| _version_ | 1811157312936607744 |
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| author | Adam J. Campbell Christina L. Hulbe Choon-Ki Lee |
| author_facet | Adam J. Campbell Christina L. Hulbe Choon-Ki Lee |
| author_sort | Adam J. Campbell |
| collection | DOAJ |
| description | Ross Ice Shelf (RIS) is known to experience transient thickness change due to changes in the flow of its tributary ice streams and glaciers and this may complicate identification of external, climate-forced signals in contemporary observations of ice shelf thinning and thickening. Flux changes at the lateral boundaries produce both instantaneous and longer timescale adjustments in the coupled velocity and thickness fields. Here, we adapt a statistical approach to output from a numerical model of ice shelf flow to identify characteristic patterns (spatial response surfaces) associated with stepped and cyclic perturbations to boundary fluxes. Once known, characteristic patterns identified in observational data may be attributed to specific sources. An example involving discharge of Byrd Glacier into RIS is described. We find that spatial response surfaces for thickness and velocity generated in individual flow model experiments appear to be independent of flux perturbation shape and magnitude. Additionally, recent acceleration of Byrd Glacier is apparent in ICESat-detected change in RIS thickness. |
| first_indexed | 2024-04-10T05:05:11Z |
| format | Article |
| id | doaj.art-c0e9e2cf491042a1923b9bfe5f127b60 |
| institution | Directory Open Access Journal |
| issn | 0260-3055 1727-5644 |
| language | English |
| last_indexed | 2024-04-10T05:05:11Z |
| publishDate | 2017-04-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Annals of Glaciology |
| spelling | doaj.art-c0e9e2cf491042a1923b9bfe5f127b602023-03-09T12:27:29ZengCambridge University PressAnnals of Glaciology0260-30551727-56442017-04-0158212710.1017/aog.2017.16The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelfAdam J. Campbell0Christina L. Hulbe1Choon-Ki Lee2School of Surveying, University of Otago, Dunedin, New Zealand. E-mail:School of Surveying, University of Otago, Dunedin, New Zealand. E-mail:Division of Polar Earth System Sciences, Korea Polar Research Institute, Incheon, Republic of KoreaRoss Ice Shelf (RIS) is known to experience transient thickness change due to changes in the flow of its tributary ice streams and glaciers and this may complicate identification of external, climate-forced signals in contemporary observations of ice shelf thinning and thickening. Flux changes at the lateral boundaries produce both instantaneous and longer timescale adjustments in the coupled velocity and thickness fields. Here, we adapt a statistical approach to output from a numerical model of ice shelf flow to identify characteristic patterns (spatial response surfaces) associated with stepped and cyclic perturbations to boundary fluxes. Once known, characteristic patterns identified in observational data may be attributed to specific sources. An example involving discharge of Byrd Glacier into RIS is described. We find that spatial response surfaces for thickness and velocity generated in individual flow model experiments appear to be independent of flux perturbation shape and magnitude. Additionally, recent acceleration of Byrd Glacier is apparent in ICESat-detected change in RIS thickness.https://www.cambridge.org/core/product/identifier/S0260305517000167/type/journal_articleglaciological model experimentsice shelveslaser altimetry |
| spellingShingle | Adam J. Campbell Christina L. Hulbe Choon-Ki Lee The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf Annals of Glaciology glaciological model experiments ice shelves laser altimetry |
| title | The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf |
| title_full | The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf |
| title_fullStr | The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf |
| title_full_unstemmed | The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf |
| title_short | The shape of change: an EOF approach to identifying sources of transient thickness change in an ice shelf |
| title_sort | shape of change an eof approach to identifying sources of transient thickness change in an ice shelf |
| topic | glaciological model experiments ice shelves laser altimetry |
| url | https://www.cambridge.org/core/product/identifier/S0260305517000167/type/journal_article |
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