What was the purpose of the CryoVex-KAREN 2016 Fall Campaign?
The main objectives of the campaign were to:
- Fly new Ka‐band radar technology radar altimeter
- Collect simultaneous Ku‐band radar altimeter data with ASIRAS and ALS data, to study penetration of radar signals into the ice sheet
- Repeat of the earlier flown EGIG‐line to detect ice sheet changes
- Surface measurements (shallow ice cores and ice densities) on the ice sheet inland of Ilulissat at T1, T4 and T5 on EGIG‐line and in the Ilulissat glacier region using helicopter
- Investigate dependencies of SARIn phase information from coincident measurements of KAREN and ASIRAS in high‐altitude mode
What was the outcome of the CryoVex-KAREN 2016 Fall Campaign?
Airborne data was acquired over the Greenland Ice Sheet along the EGIG‐line at different altitudes representing both the ablation, percolation and the dry snow zone. This data set along with the in‐situ observations of density profiles from shallow ice cores and SnowMicroPen adds valuable information of the seasonal behaviour of the radar signals, which has so far only been obtained in the spring during previous CryoVEx campaigns.
The horizontal location of the KAREN and ASIRAS reference points from the post‐processed data are within the expected accuracies of their physical displacement. Comparison of phases of coincident SARIn acquisition from KAREN and ASIRAS data show no direct dependencies. However, the phases seem to be anti‐correlated, which is currently being investigated.
As expected KAREN show primarily surface scattering with little penetration, whereas ASIRAS show primarily surface scattering in the percolation zone and penetration down to about 15 m in the dry snow zone with several visible melt layers.
|Thermatic area||Cryosphere/Land ice|