Refurbishment of HUTRAD 2.0 multifrequency radiometer for the MOSAiC Expedition

The one-year long MOSAiC campaign ( in the Central Arctic offers the unique opportunity to obtain comprehensive snow and sea ice measurements for a complete seasonal cycle together with a dedicated remote sensing program. The goal of the MOSAiC expedition is to take the closest look ever at the Arctic as the epicenter of global warming and to gain fundamental insights that are key to better understand global climate change.

HUTRAD radiometer mounted on a sled uses its multi-frequency (C-, X-, Ku-band) capabilities during the MOSAiC campaign. The radiometer observations are complemented by detailed in-situ measurements of snow and sea ice properties, and further microwave radiometer measurements at lower frequencies (P-, L-band) as well as scatterometer measurements (L-, C-, X-, Ku-band).

With the contribution of HUTRAD 2.0 taking measurements within MOSAiC Expedition on-board Polarstern, all the frequencies for the future CIMR Copernicus Imaging Microwave Radiometer – CIMR are now covered.

Tasks done by MWSE team during the refurbishment of HUTRAD 2.0 for the Arctic included:

  • development of HUTRAD onboard Command & Data Handling board (C&DH) with a state of the art Linux-embeded system, control boards, and its software.
  • development of a power system capable to provide up to 7 hours of uninterrupted power supply with unmanned external power control capabilities.
  • Coordination of the design and construction of the tower and the sled for the radiometer.

Following images correspond to HUTRAD operating during the MOSAiC Expedition.

MOSAiC remote sensing site (credits: MOSAiC Expedition)
A visitor in the remote sensing site (credits: MOSAiC Expedition)
MWSE team after last HUTRAD test before shipping it to the Finish Meteorological Institute