New MOSAiC Value-Added Product Released to Evaluation

Published: 27 September 2022

A Doppler lidar with an ARM/U.S. Department of Energy sticker affixed sits on the research icebreaker R/V Polarstern, which is prepared to leave Tromsø, Norway, for the MOSAiC expedition.
ARM deployed a Doppler lidar on the research icebreaker R/V Polarstern for the Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. The Polarstern left Tromsø, Norway, in September 2019 for a 13-month expedition that went through the central Arctic.

A new value-added product (VAP) developed specifically for the Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition is now available for evaluation. This VAP applies a motion correction to Doppler lidar measurements collected on the research icebreaker R/V Polarstern, which drifted through the central Arctic during MOSAiC.

The Doppler Lidar Motion Corrected (DLMC) VAP requires inertial data from the Atmospheric Radiation Measurement (ARM) user facility’s navigational location and attitude system for sea-based mobile deployments. DLMC uses the inertial data to transform the Doppler lidar beam angles (azimuth and elevation) from the lidar’s frame of reference to an Earth-fixed frame, such that the azimuth angle is measured clockwise from true north and the elevation angle is measured from the local horizon.

In addition, the VAP compensates the observed radial (air) velocity data for the effects of the platform velocity (i.e., corrected_radial_velocity = observed_radial_velocity – platform_radial_velocity).

MOSAiC DLMC products from October 11, 2019, through September 20, 2020, are ready to use now. The dlmcfpt product contains the fixed point, or staring data. The dlmcusr product contains a user-defined scan, which the MOSAiC science team defined for the campaign.

More information about DLMC can be found on the VAP web page. To provide feedback or ask questions about this evaluation product, please email VAP contact Rob Newsom or ARM translator Damao Zhang.

Access the data now in the ARM Data Center. (Go here to create an account to download the data.)

To cite the fixed-point data, please use doi:10.5439/1823260. To cite the user-defined scan data, use doi:10.5439/1824204.

# # #

ARM is a DOE Office of Science user facility operated by nine DOE national laboratories.