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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/12979

Title: Modelling variable glacier lapse rates using ERA-Interim reanalysis climatology: an evaluation at Vestari- Hagafellsjökull, Langjökull, Iceland
Authors: Hodgkins, Richard
Carr, S.
Palsson, F.
Gumundsson, S.
Bjornsson, H.
Keywords: Air temperature
Lapse rate
Automatic weather station
Issue Date: 2013
Publisher: Wiley © Royal Meteorological Society
Citation: HODGKINS, R. ... et al, 2013. Modelling variable glacier lapse rates using ERA-Interim reanalysis climatology: an evaluation at Vestari- Hagafellsjökull, Langjökull, Iceland. International Journal of Climatology, 33 (2), pp. 410 - 421
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) 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. © 2012 Royal Meteorological Society.
Description: This article was published in the serial International Journal of Climatology [Wiley © Royal Meteorological Society]. The definitive version is available at: http://dx.doi.org/10.1002/joc.3440
Version: Accepted for publication
DOI: 10.1002/joc.3440
URI: https://dspace.lboro.ac.uk/2134/12979
Publisher Link: http://dx.doi.org/10.1002/joc.3440
ISSN: 0899-8418
Appears in Collections:Published Articles (Geography and Environment)

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