Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland
Abstract The near‐surface air temperature lapse rate is an important tool for spatially distributing temperatures in snow‐ and ice‐melt models, but is difficult to parameterize, as it is not simply correlated with boundary‐layer meteorological variables, such as temperature itself. This contribution...
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crwiley:10.1002/joc.3440 2024-06-02T08:07:04+00:00 Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland Hodgkins, R. Carr, S. Pálsson, F. Guðmundsson, S. Björnsson, H. 2012 http://dx.doi.org/10.1002/joc.3440 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3440 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3440 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 33, issue 2, page 410-421 ISSN 0899-8418 1097-0088 journal-article 2012 crwiley https://doi.org/10.1002/joc.3440 2024-05-03T11:19:55Z Abstract The near‐surface air temperature lapse rate is an important tool for spatially distributing temperatures in snow‐ and ice‐melt models, but is difficult to parameterize, as it is not simply correlated with boundary‐layer meteorological variables, such as temperature itself. This contribution quantifies spring‐autumn lapse rate variability over 5 years at Vestari‐Hagafellsjökull, a southerly outlet of Langjökull in Iceland. It is observed that summer lapse rates (0.57 °C 100 m −1 ) are significantly lower than non‐summer rates, and are also lower than the Saturated Adiabatic Lapse Rate (SALR), which is often adopted in melt models. This is consistent with reduced near‐surface temperature sensitivity to free‐atmosphere temperature change during the occurrence of melting. A Variable Lapse Rate (VLR) regression model is calibrated with standardized, 750 hPa temperature anomalies derived from ERA‐Interim climatology, which is shown to be highly significantly correlated with near‐surface temperatures. The modelled VLR overestimates cumulative June–September Positive Degree Days (PDDs) by 3% when used to extrapolate temperatures from 1100 to 500 m a.s.l. on the glacier, whereas the SALR overestimates cumulative PDDs by 14%. ERA‐Interim data therefore appear to offer a good representation of free‐atmosphere temperature variability over Vestari‐Hagafellsjökull, and the modelling approach offers a simple means of improving lapse rate parameterizations in melt models. Copyright © 2012 Royal Meteorological Society Article in Journal/Newspaper glacier Iceland Langjökull Wiley Online Library Langjökull ENVELOPE(-20.145,-20.145,64.654,64.654) International Journal of Climatology 33 2 410 421 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The near‐surface air temperature lapse rate is an important tool for spatially distributing temperatures in snow‐ and ice‐melt models, but is difficult to parameterize, as it is not simply correlated with boundary‐layer meteorological variables, such as temperature itself. This contribution quantifies spring‐autumn lapse rate variability over 5 years at Vestari‐Hagafellsjökull, a southerly outlet of Langjökull in Iceland. It is observed that summer lapse rates (0.57 °C 100 m −1 ) are significantly lower than non‐summer rates, and are also lower than the Saturated Adiabatic Lapse Rate (SALR), which is often adopted in melt models. This is consistent with reduced near‐surface temperature sensitivity to free‐atmosphere temperature change during the occurrence of melting. A Variable Lapse Rate (VLR) regression model is calibrated with standardized, 750 hPa temperature anomalies derived from ERA‐Interim climatology, which is shown to be highly significantly correlated with near‐surface temperatures. The modelled VLR overestimates cumulative June–September Positive Degree Days (PDDs) by 3% when used to extrapolate temperatures from 1100 to 500 m a.s.l. on the glacier, whereas the SALR overestimates cumulative PDDs by 14%. ERA‐Interim data therefore appear to offer a good representation of free‐atmosphere temperature variability over Vestari‐Hagafellsjökull, and the modelling approach offers a simple means of improving lapse rate parameterizations in melt models. Copyright © 2012 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Hodgkins, R. Carr, S. Pálsson, F. Guðmundsson, S. Björnsson, H. |
spellingShingle |
Hodgkins, R. Carr, S. Pálsson, F. Guðmundsson, S. Björnsson, H. Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
author_facet |
Hodgkins, R. Carr, S. Pálsson, F. Guðmundsson, S. Björnsson, H. |
author_sort |
Hodgkins, R. |
title |
Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
title_short |
Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
title_full |
Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
title_fullStr |
Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
title_full_unstemmed |
Modelling variable glacier lapse rates using ERA‐Interim reanalysis climatology: an evaluation at Vestari‐ Hagafellsjökull, Langjökull, Iceland |
title_sort |
modelling variable glacier lapse rates using era‐interim reanalysis climatology: an evaluation at vestari‐ hagafellsjökull, langjökull, iceland |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1002/joc.3440 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3440 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3440 |
long_lat |
ENVELOPE(-20.145,-20.145,64.654,64.654) |
geographic |
Langjökull |
geographic_facet |
Langjökull |
genre |
glacier Iceland Langjökull |
genre_facet |
glacier Iceland Langjökull |
op_source |
International Journal of Climatology volume 33, issue 2, page 410-421 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.3440 |
container_title |
International Journal of Climatology |
container_volume |
33 |
container_issue |
2 |
container_start_page |
410 |
op_container_end_page |
421 |
_version_ |
1800752088957845504 |