Cloud mask derived from airborne HAMP Cloud Radar measurements during the EUREC4A field campaign.

The HAMP Radar cloud mask uses radar reflectivities measured by the cloud radar, which is part of the HALO Microwave Package (HAMP). The radar was operated in a near-nadir-viewing configuration. For detailed information see Mech et al. (2014) and Ewald et al. (2019). The reflectivity data is analyzed at a 1 Hz time interval and with 30 m vertical resolution. Reflectivity data are first filtered for clutter. Any signal above the noise level at 200 m above sea level or higher, is considered a possible cloud. Signals originating from object of at least four contiguous pixels are classified as "most likely" a cloud, otherwise it is "probably" a cloud signal.