Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
Geosci. Instrum. Method. Data Syst., 5, 85-94, 2016
http://www.geosci-instrum-method-data-syst.net/5/85/2016/
doi:10.5194/gi-5-85-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
14 Apr 2016
Arctic Snow Microstructure Experiment for the development of snow emission modelling
William Maslanka1, Leena Leppänen2, Anna Kontu2, Mel Sandells3, Juha Lemmetyinen2, Martin Schneebeli4, Martin Proksch4, Margret Matzl4, Henna-Reetta Hannula2, and Robert Gurney1 1Department of Meteorology, University of Reading, Reading, UK
2Finnish Meteorological Institute, Arctic Research Centre, Sodankylä, Finland
3CORES Science and Engineering LTD, Burnopfield, UK
4WSL Institute of Snow and Avalanche Research, SLF, Davos, Switzerland
Abstract. The Arctic Snow Microstructure Experiment (ASMEx) took place in Sodankylä, Finland in the winters of 2013–2014 and 2014–2015. Radiometric, macro-, and microstructure measurements were made under different experimental conditions of homogenous snow slabs, extracted from the natural seasonal taiga snowpack. Traditional and modern measurement techniques were used for snow macro- and microstructure observations. Radiometric measurements of the microwave emission of snow on reflector and absorber bases were made at frequencies 18.7, 21.0, 36.5, 89.0, and 150.0 GHz, for both horizontal and vertical polarizations. Two measurement configurations were used for radiometric measurements: a reflecting surface and an absorbing base beneath the snow slabs. Simulations of brightness temperatures using two microwave emission models, the Helsinki University of Technology (HUT) snow emission model and Microwave Emission Model of Layered Snowpacks (MEMLS), were compared to observed brightness temperatures. RMSE and bias were calculated; with the RMSE and bias values being smallest upon an absorbing base at vertical polarization. Simulations overestimated the brightness temperatures on absorbing base cases at horizontal polarization. With the other experimental conditions, the biases were small, with the exception of the HUT model 36.5 GHz simulation, which produced an underestimation for the reflector base cases. This experiment provides a solid framework for future research on the extinction of microwave radiation inside snow.

Citation: Maslanka, W., Leppänen, L., Kontu, A., Sandells, M., Lemmetyinen, J., Schneebeli, M., Proksch, M., Matzl, M., Hannula, H.-R., and Gurney, R.: Arctic Snow Microstructure Experiment for the development of snow emission modelling, Geosci. Instrum. Method. Data Syst., 5, 85-94, doi:10.5194/gi-5-85-2016, 2016.
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The paper presents the initial findings of the Arctic Snow Microstructure Experiment in Sodankylä, Finland. The experiment observed the microwave emission of extracted snow slabs on absorbing and reflecting bases. Snow parameters were recorded to simulate the emission upon those bases using two different emission models. The smallest simulation errors were associated with the absorbing base at vertical polarization. The observations will be used for the development of snow emission modelling.
The paper presents the initial findings of the Arctic Snow Microstructure Experiment in...
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