OceanRAIN—the Ocean Rainfall And Ice-phase precipitation measurement Network—provides in-situ along-track shipboard data of precipitation, evaporation and the resulting freshwater flux in 1-min resolution over the global oceans. All routinely measured atmospheric and oceanographic state variables along with those required to derive the turbulent heat fluxes are included.
The precipitation parameter is based on measurements from the optical disdrometer ODM470 that is specifically designed for all-weather shipboard operation. The rain, snow and mixed-phase precipitation occurrence, intensity and accumulation are derived from particle size distributions (PSD). Additionally, microphysical parameters and radar-related parameters are provided.
Three OceanRAIN version 1.0 products are available in NetCDF and Ascii formats:
- OceanRAIN-W: Water cycle components, continuous in time, 73 parameters, > 6.83 million minutes of data, 1-minute resolution.
- OceanRAIN-M: Precipitation microphysical parameters, discontinuous in time, 37 parameters plus 128 size-bin number concentration particle size distributions, > 692.000 minutes, 1-minute resolution.
- OceanRAIN-R: Optical disdrometer raw data and precipitation microphysical parameters, discontinuous in time, 37 parameters plus 128 size-bin raw particle count size distributions, > 692.000 minutes, 1-minute resolution.
OceanRAIN Version 1.0 contains 73 parameters plus PSD data in 128 size bins. The time period from 06/2010 to 04/2017 comprises more than 6.83 million minutes of data from eight ships with precipitation observed in about 10% of the time. The research vessels sail the global oceans during all seasons, avoiding the fair-weather bias and thus covering the entire spectrum of weather events.
OceanRAIN provides in-situ water cycle surface reference data for satellite product validation and retrieval calibration of the GPM (Global Precipitation Measurement) era, to analyze the point-to-area representativeness of precipitation and to improve our understanding of water cycle processes over the global oceans. Moreover, the data can be applied to evaluate re-analysis and climate model data.
The data set is funded by Initiative Pro Klima (www.initiativeproklima.de) and the CliSAP excellence cluster at the University of Hamburg. More information on OceanRAIN data, instrumentation and the processing chain are available via www.oceanrain.org.
Last update of this data set at ICDC: Nov 14, 2017.