Jutta Vüllers, Peggy Achtert, Ian Brooks, Ryan Neely III, Barbara Brooks
This dataset consists of a range of output products from the Cloudnet algorithm. Cloudnet combines cloud radar, ceilometer, microwave radiometer, and radiosonde profiles averaged to a common grid at the cloud radar resolution to derive a set of retrieved cloud properties. These include: (1) macrophysical properties such as cloud base and top heights, liquid and ice water paths, (2) cloud fraction, (3) microphysical particle classifications such as ice, liquid, mixed-phase, and aerosol, (4) estimates of particle effective radii, liquid and ice water contents, and precipitation rates.
The Cloudnet products are designed to be used for evaluation of weather forecast models as well as fundamental process studies of cloud.
This dataset derives from measurements made during the Arctic Ocean 2018 expedition on icebreaker Oden during summer 2018 (August 1 – September 21). Data is presented on a 30-second time base, and approximately 24 m vertical resolution.
Jutta Vüllers, Peggy Achtert, Ian Brooks, Ryan Neely III, Barbara Brooks (2021) Cloudnet remote sensing retrievals of cloud properties during the Arctic Ocean 2018 expedition. Dataset version 4. Bolin Centre Database. https://doi.org/10.17043/oden-ao-2018-cloudnet-4
Vüllers J, Achtert P, Brooks IM, Tjernström M, Prytherch J, Burzik A, Neely III R (2021) Meteorological and cloud conditions during the Arctic Ocean 2018 expedition. Atmos Chem Phys 21:289 – 314. https://doi.org/10.5194/acp-21-289-2021
Data are provided as the standard set of Cloudnet output files. All data files are netCDF, with one file per day. The data are organized as subsets in seven directories, each containing 40 nc files:
categorize — The various input data and some derived quantities, used by cloudnet (radar reflectivity, lidar backscatter, profiles of temperature, humidity, wind, etc).
classification — Basic particle type classification for each time/height grid point (liquid, ice, aerosol...), cloud boundary altitudes.
drizzle — Drizzle precipitation rate.
iwc-Z-T-method — Ice water content and total ice water path.
lwc-adiabatic-method — Cloud liquid water content derived from an assumption of adiabatic profiles, also liquid water path.
lwc-scaled-adiabatic — Cloud liquid water content derived from an assumption of adiabatic profiles scaled to the total liquid water path (derived from microwave radiometer retrieval), also liquid water path.
lwf-Z-rainrate — Liquid water precipitation rate, and droplet properties.
quicklooks — Daily quicklooks of measurement data (png image files).
All nc data files include time and position (latitude, longitude), and descriptions of the variables and methods and assumptions used to derive them. Retrieval uncertainties are given for most variables.
Total file size: 11.6 GB (compressed 2.9 GB).
Please cite the article by Vüllers et al. (2021) when using this dataset.
Details of the cloudnet algorithm, including technical reports can be found at the Cloudnet data portal at the ACTRIS Data Centre node for cloud profiling, hosted by the Finnish Meteorological Institute (FMI).
The underlying measurement data were collected during the Arctic Ocean 2018 expedition on board the Swedish icebreaker (I/B) Oden, which was organized by the Swedish Polar Research Secretariat.
Cloudnet internal LWP correction switched off as it was discarding data during fog events. Adjustment of radiosonde temperature profile interpolation within Cloudnet.