Circumpolar patterns of potential mean annual ground temperature based on surface state obtained from microwave satellite data

Gap filling is required for temporally and spatially consistent records of land surface temperature from satellite data due to clouds or snow cover. Land surface state, frozen versus unfrozen conditions, can be, however, captured globally with satellite data obtained by microwave sensors. The number...

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Bibliographic Details
Published in:The cryosphere 2018-07, Vol.12 (7), p.2349-2370
Main Authors: Kroisleitner, Christine, Bartsch, Annett, Bergstedt, Helena
Format: Article
Language:English
Subjects:
Annual
Atmospheric temperature
Boreholes
Data
Data processing
Datasets
Depth
Environmental conditions
Forecasts and trends
Frozen ground
Glaciers
Land cover
Land surface temperature
Microwave sensors
Modelling
Northern Hemisphere
Permafrost
Records
Resolution
Resolution cell
Satellite data
Satellite remote sensing
Satellites
Scatterometers
Sensors
Snow
Snow cover
Snow-water equivalent
Snowmelt
Soil
Soil properties
Soil temperature
Soil water
Spacecraft recovery
Spatial data
Spatial discrimination
Special Sensor Microwave Imager
Surface temperature
Temperature effects
Temperature requirements
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Summary:Gap filling is required for temporally and spatially consistent records of land surface temperature from satellite data due to clouds or snow cover. Land surface state, frozen versus unfrozen conditions, can be, however, captured globally with satellite data obtained by microwave sensors. The number of frozen days per year has been previously proposed to be used for permafrost extent determination. This suggests an underlying relationship between number of frozen days and mean annual ground temperature (MAGT). We tested this hypothesis for the Northern Hemisphere north of 50° N using coarse-spatial-resolution microwave satellite data (Metop Advanced SCATterometer - ASCAT - and Special Sensor Microwave Imager - SSM/I; 12.5 and 25 km nominal resolution; 2007-2012), which provide the necessary temporal sampling. The MAGT from GTN-P (Global Terrestrial Network for Permafrost) borehole records at the coldest sensor depth was tested for validity in order to build a comprehensive in situ data set for calibration and validation and was eventually applied. Results are discussed with respect to snow water equivalent, soil properties, land cover and permafrost type. The obtained temperature maps were classified for permafrost extent and compared to alternative approaches.
ISSN:1994-0424
1994-0416
1994-0424
1994-0416
DOI:10.5194/tc-12-2349-2018