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Bennartz, Ralf; Stengel, Martin; Schröder, Marc; Hollmann, Rainer; Picard, Bruno; Fell, Frank
Total column water vapour from the Microwave Radiometer (MWR) instruments onboard ERS-1, ERS-2, and ENVISAT
Deutscher Wetterdienst (DWD)
551 Geology, hydrology, meteorology
Dewey Decimal Classification (DDC)
European Space Agency (ESA)
Global ice-free ocean
The Microwave Radiometer (MWR) flown onboard ERS-1, ERS-2, and Envisat has provided a time series of global microwave observations over a period of nearly 21 years between 1991 and 2012. A successor instrument (also called MWR) with very similar characteristics is carried onboard the Sentinel-3 satellites, two of which have meanwhile been launched (Sentinel-2A in February 2016 and Sentinel-3B in April 2018). After a gap of ca. four years, MWR observations are thus again available from early 2016 well into the mid-2020s and beyond. While the EMiR V1.1 data record described herein only covers the ERS-1, ERS-2, and Envisat missions, future extension is envisaged by additionally considering MWR observations from the Sentinel-3 satellites.
The EMiR dataset builds on the MWR time series of brightness temperature observations in the two channels at 23 and 36 GHz and provides information on Total Column Water Vapour (TCWV) and Wet Tropospheric Correction (WTC) in clear and cloudy sky conditions over the global ice-free oceans. A one-dimensional variational approach (1D-VAR) has been applied to derive TCWV from MWR observations and ERA-Interim background information. A particular focus during product generation has been put on the intercalibration and homogenisation of the three different MWR instruments, which has been achieved by constraining Liquid Water Path (LWP) and TCWV retrievals. By comparison with TCWV derived from the Global Navigation Satellite System (GNSS), we find that the MWR-derived TCWV values are accurate and stable over time (see the EMiR validation report).
The EMiR dataset is provided for individual orbits at MWR's native spatial resolution of typically 20 km (Level-2) as well as in a gridded form providing monthly mean values at spatial resolutions of 2° × 2° and 3° × 3° (Level 3).
How to cite the EMiR data record?
Bennartz, R., M. Stengel, M. Schröder, R. Hollmann, B. Picard, and F. Fell (2016): Total column water vapour from the Microwave Radiometer (MWR) instruments onboard ERS-1, ERS-2, and ENVISAT, doi:10.5676/DWD_EMIR/V002.
Data protection policy
Please take note of DWD's data protection policy under https://www.dwd.de/EN/service/dataprotection/dataprotection.html.
The EMiR dataset was assembled as a service to the atmospheric and oceanic research community. No warranties to the correctness and accuracy of the information therein can be made.