Digital Object Identifier
Entry information for COMBI_V001
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Title
A combined high resolution global TCWV product from microwave and near infrared imagers - COMBI
Citation
Schröder, Marc; Danne, Olaf; Falk, Ulrike; Niedorf, Anja; Preusker, Rene; Trent, Tim; Brockmann, Carsten; Fischer, Jürgen; Hegglin, Michaela; Hollmann, Rainer; Pinnock, Simon (2023): A combined high resolution global TCWV product from microwave and near infrared imagers - COMBI, Satellite Application Facility on Climate Monitoring, DOI:10.5676/EUM_SAF_CM/COMBI/V001, https://doi.org/10.5676/EUM_SAF_CM/COMBI/V001. [BibTeX entry]
Publisher
Satellite Application Facility on Climate Monitoring (CM SAF)
Publication year
2023
Author(s)
Schröder, Marc; Danne, Olaf; Falk, Ulrike; Niedorf, Anja; Preusker, Rene; Trent, Tim; Brockmann, Carsten; Fischer, Jürgen; Hegglin, Michaela; Hollmann, Rainer; Pinnock, Simon
Description
The global total column water vapour (TCWV) data record combines microwave and near-infrared imager based TCWV over the ice-free ocean and over land, coastal ocean as well as sea-ice, respectively. The data record relies on microwave observations from SSM/I, SSMIS, AMSR-E and TMI, partly based on a fundamental climate data record (Fennig et al., 2020; Fennig et al., 2017) and on near-infrared observations from MERIS (3rd reprocessing), MODIS-Terra (collection 6.1) and OLCI (1st reprocessing). Details of the retrieval are described in Andersson et al. (2010) and ATBD HOAPS for the microwave imagers as well as in Lindstrot et al. (2012), Diedrich et al. (2015) and ABTD NIR Level 2 for the near-infrared imagers. The water vapour of the atmosphere is vertically integrated over the full column and given in units of kg/m². The microwave and near-infrared data streams are processed independently and combined afterwards by not changing the individual TCWV values and their uncertainties. The combined data record has a spatial resolution of 0.5°x0.5° and 0.05°x0.05°, with the near-infrared based data being averaged and the microwave-based data being oversampled to match the lower and higher spatial resolution, respectively. The product is available as daily and monthly means and covers the period July 2002 – December 2017.
Format
NetCDF-4
Version
3.1
Temporal coverage
2002-07-01 - 2017-12-31
Geographic coverage
Latitude: -90° S to 90° N
Longitude: -180° W to 180° E
Size
290 GiB
Documentation
- Product User Manual (PUM) COMBI
- Validation Report (VAL) COMBI
- Algorithm Theoretical Baseline Document (ATBD) COMBI
- Algorithm Theoretical Baseline Document (ATBD) HOAPS
- Algorithm Theoretical Baseline Document (ATBD) NIR Level 2
Related publications
- Diedrich, H., R. Preusker, R. Lindstrot, and J. Fischer, 2015: Retrieval of daytime total columnar water vapour from MODIS measurements over land surfaces. Atmospheric Measurement Techniques, 8:823-836, https://doi.org/10.5194/amt-8-823-2015.
- Eiras-Barca, Jorge, Iago Algarra, Raquel Nieto, Marc Schröder, Michaela I. Hegglin, Luis Gimeno, Analysis of the main source regions of moisture transport events with the new ESA CCI/CM-SAF total column water vapour climate data record (v2). Quarterly Journal of the Royal Meteorological Society, 1–15, https://doi.org/10.1002/qj.4358, 2022
- Fennig, Karsten; Schröder, Marc; Hollmann, Rainer (2017): Fundamental Climate Data Record of Microwave Imager Radiances, Edition 3, Satellite Application Facility on Climate Monitoring, DOI:10.5676/EUM_SAF_CM/FCDR_MWI/V003, https://doi.org/10.5676/EUM_SAF_CM/FCDR_MWI/V003.
- Fennig, K., Schröder, M., Andersson, A., and Hollmann, R.: A Fundamental Climate Data Record of SMMR, SSM/I, and SSMIS brightness temperatures, Earth Syst. Sci. Data, 12, 647–681, https://doi.org/10.5194/essd-12-647-2020, 2020.
- He, J., Brogniez, H., and Picon, L.: Evaluation of tropical water vapour from CMIP6 global climate models using the ESA CCI Water Vapour climate data records, Atmos. Chem. Phys., 22, 12591–12606, https://doi.org/10.5194/acp-22-12591-2022, 2022
- Lindstrot, R., R. Preusker, H. Diedrich, L. Doppler, R. Bennartz, and J. Fischer, 2012: 1D-Var retrieval of daytime total columnar water vapour from MERIS measurements. Atmospheric Measurement Techniques, 5: 631–646, https://doi.org/10.5194/amt-5-631-2012.
Related Data Records
- A previous version of this data record is available from here: DOI:10.5676/DFE/WV_COMB/FP.
- A previous version of this data record is available from here: DOI:10.24381/cds.8e0e4724.
Comment
The combined MW and NIR product was initiated and funded by the ESA Water_Vapour_cci project.
The NIR retrieval was developed by Spectral Earth. The MW data was processed by EUMETSAT CM SAF.
The NIR data was processed and combined with the MW data by Brockmann Consult. NIR data is owned
by Brockmann Consult and Spectral Earth. The MW data and the combined MW and NIR product is
owned by EUMETSAT CM SAF.
Please note, that the monthly and daily mean products (see below) are each available in two different spatial resolutions, namely 0.5 and 0.05 degrees.