On-Glacier Meteorological Data for Haut Glacier d'Arolla, Switzerland

The compiled dataset is a series of summer meteorological observations on the Swiss Haut Glacier d'Arolla (45.97°N, 7.52°E) 
to support the analysis presented in the manuscript:

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 "The Decaying Near-Surface Boundary Layer of a Retreating Alpine Glacier", 
submitted to Geophysical Research Letters.  

Thomas E. Shaw1, Pascal Buri1, Michael McCarthy1, Evan S. Miles1, Álvaro Ayala2, Francesca Pellicciotti1

1 Swiss Federal Institute, WSL, Birmensdorf, Switzerland
2 Centro de Estudios Avanzados en Zonas Áridas, La Serena, Chile

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The following files are provided:
1) 6 x xlsx files "Arolla_Meteorological_Data_[YEAR].xlsx"
    contains within are tabs for:
        i) The station locations and elevations (tab "[YEAR]_Info").
        ii) All AWS/Tlogger data in hourly format (tab "[YEAR]_Met_Data").
        iii) Only the hourly air temperature data for on-glacier sites (tab "[YEAR]_Ta").

2) Glacier outlines (.shp) for years 1850 (GLAMOS), 1973 (GLAMOS), 1994 (Carenzo, 2012), 1999 (Carenzo et al., 2012), 2010 (GLAMOS), 2022 (Digitised from PlanetScope imagery).
3) Debris cover area (.shp) derived by applying an NDSI classification of cloud filtered, summer Landsat scenes in Google Earth Engine following the approach of Scherler et al. (2018).

For the meteorological data in 1), the following variables are provided:
"TA" = near surface air temperature (°C).
"RH" - relative humidity (%).
"SWIN" - Shortwave incoming radiation (Wm^-2).
"SWOUT" - Shortwave outgoing radiation (Wm^-2).
"LWIN" - Longwave incoming radiation (Wm^-2).
"LWOUT" - Longwave outgoing radiation (Wm^-2).
"FF" - Wind speed (m s-1).
"DIR" - Wind direction (°).
"PP" - precipitation (mm).
"DEW" - dew point temperature (°C).

The term "OG" refers to an off-glacier station, which are numbered accordingly. If no variable names are given as a header in the "Met_Data" tab, then the data are air temperature values.   

Data are filtered for obvious errors and errors are then removed.  Data are not gap-filled as this would affect the analysis presented about patterns in air temperature data.  

Data were checked and compiled by Thomas Shaw (WSL) - thomas.shaw@wsl.ch
Data were measured by ETH (2001-2010) and WSL as part of the Marie-Curie Project 'TEMPEST' (2021-2022).

Details of data collection and analysis can be found in:
Strasser et al. (2004) - 2001.
Carenzo (2012) - 2001-2010.
Shaw et al. (N.D.) 2021-2022. 

%% CITED WORK

Carenzo, M. (2012). Distributed modelling of changes in glacier mass balance and runoff (Issue 20616). ETH Zurich.

Scherler, D., Wulf, H., & Gorelick, N. (2018). Global Assessment of Supraglacial Debris-Cover Extents. Geophysical Research Letters, 45(21), 11,798-11,805. https://doi.org/10.1029/2018GL080158

Shaw, T. E., Buri, P., McCarthy, M., Miles, E. S., Ayala, Á., & Pellicciotti, F. (2023). The Decaying Near-Surface Boundary Layer of a Retreating Alpine Glacier. Geophysical Research Letters, 50, 1–12. https://doi.org/10.1029/2023GL103043

Strasser, U., Corripio, J. G., Pellicciotti, F., Burlando, P., Brock, B. W., & Funk, M. (2004). Spatial and temporal variability of meteorological variables at Haut Glacier d'Arolla (Switzerland) during the ablation season 2001: Measurements and simulations. Journal of Geophysical Research, 109, D03103. https://doi.org/10.1029/2003JD003973

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This work was funded by the EU Horizon 2020 Marie Skłodowska-Curie Actions Grant 101026058.