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History of modifications
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Version | Date | Description of modification | Chapters / Sections | 1.0 | 31/08/2020 | First version for review | all | 1.0.1 | 01/10/2020 | Corrections & updates after KM's and ZS's comments |
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List of datasets covered by this document
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Deliverable ID | Product title | Product type (CDR, ICDR) | Version number | Delivery date | D3.3.12v1.1-P3 | Water Vapour UTH_MW ICDR v1.1 (Quarterly) – Period 3 | ICDR | 1.1 | 08/2019 | D3.3.12v1.2-P4 | Water Vapour UTH_MW ICDR v1.2 (Quarterly) – Period 4 | ICDR | 1.2 | 11/2019 | D3.3.12v1.3-P4 | Water Vapour UTH_MW ICDR v1.3 (Quarterly) – Period 4 | ICDR | 1.3 | 02/2020 | D3.3.12v1.4-P5 | Water Vapour UTH_MW ICDR v1.4 (Quarterly) – Period 5 | ICDR | 1.4 | 05/2020 |
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Acronyms
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Acronym | Definition | C3S | Copernicus Climate Change Service | CDO | Climate Data Operators | CM SAF | Climate Monitoring Satellite Application Facility | EUMETSAT | European Organisation for the Exploitation of Meteorological Satellites | FCDR | Fundamental Climate Data Record | ICDR | Interim Climate Data Record | GNU | GNU's Not Unix (recursive acronym) | GPL | GNU Public License | MHS | Microwave Humidity Sounder | MPI-M | Max-Planck-Institut fuer Meteorologie | NetCDF | Network Common Data Format | PQAR | Product Quality Assessment Report | PUGS | Product User Guide and Specification | PUM | Product User Manual | RH | Relative Humidity | TCDR | Thematic Climate Data Record | UTH | Upper Tropospheric Humidity |
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Scope of the document
This document is the Product User Guide and Specification (PUGS) document, version 1.2, for the microwave upper tropospheric humidity (UTH) ICDR product. Information about the product and a technical description of the data record, including information on the file format as well as on the data access, is provided in the CM SAF Product User Manual [D1].
Executive summary
A technical description of the data record is provided. Further details on the implementation of the retrieval processing chain, and individual algorithm descriptions, are available in the CM SAF Algorithm Theoretical Basis Document [D2]. The UTH CDR product is available in NetCDF4 file format as daily averages on a 1° × 1° latitude-longitude grid, as well as the daily mean UTH for all gridboxes with valid ascending and descending observations. Instantaneous satellite observations are used to provide a spatio-temporal averaged data record with near global coverage. The temporal coverage of the ICDR data is from 1/1/2016 to 31/5/2020. Validation has been performed against equivalent UTH derived from the ERA-Interim (to July 2019) and ERA-5 (from August 2019) reanalysis fields. The achieved product performance will be described in a Product Quality Assessment Report (PQAR), due for delivery in November 2020.
For further details refer to the CM SAF Product User Manual [D1].
Upper Tropospheric Humidity Climate Data Record (UTH CDR)
The UTH CDR derived from satellite microwave humidity sounder observations provides near-global coverage. The instantaneous satellite observations are used to derive a spatio-temporal averaged data record, available as twice daily (one for the ascending and the other for the descending passes) averages on a regular latitude/longitude grid with a spatial resolution of 1° × 1° degrees. Additionally, the daily mean UTH is provided, which is a weighted average of ascending and descending orbits for all the gridpoints with valid ascending and descending observations. The accuracy of the daily UTH CDR was determined by validating the global product against the equivalent UTH derived from the ERA-Interim reanalysis.
This product continues the time series started from the CM SAF dataset (1999-2015). The product is described in detail in the CM SAF Product User Manual [D1], including the retrieval method, target requirements, an illustrative example, a data record accuracy summary, and presentation of general limitations.
Product description
The UTH TCDR and ICDR derived from satellite microwave humidity sounder observations provide near-global coverage. Instantaneous satellite observations from the Microwave Humidity Sounder (MHS) instrument are used to derive a spatio-temporal averaged data record. The data are available as twice daily (one for the ascending and the other for the descending passes) averages on a regular latitude/longitude grid with a spatial resolution of 1° × 1° degrees. Additionally, the daily mean UTH is provided, which is a weighted average of ascending and descending orbits for all the gridpoints with valid ascending and descending observations.
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Detailed information about the retrieval method used to generate the UTH product, which is based on the method presented in Buehler and John (2005), can be found in the CM SAF ATBD [D2].
Target requirements
A summary of the accuracy of the CM SAF UTH data record is provided by Table 1 of the CM SAF PUM [D1]. The data record accuracy has been assessed by comparing the CM SAF UTH global, 1x1 degree, daily mean fields with the equivalent UTH derived from ERA-Interim (until July 2019) and ERA-5 (from August 2019 onwards).
The data used is summarised in Table 3-2 of the CM SAF PUM [D1].
The UTH products are provided as Network Common Data Format (NetCDF) files (http://www.unidata.ucar.edu/software/netcdf/). The data files are created following NetCDF Climate and Forecast (CF) Metadata Convention version 1.6 (httphttps://cfconventions.org/cfconventionscf-conventions/v1.6.0/cf-conventions.html) and NetCDF Attribute Convention for Dataset Discovery version 1.3 (http://wiki.esipfed.org/index.php/Attribute_Convention_for_Data_Discovery_1-3).
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Further details about each data record, including limitations and shortcomings, can be found in the CM SAF ATBD [D2].
Data access information
The internet addresshttps://cds.climate.copernicus.eu allows direct access to the data ordering interface. On this webpage a detailed description of how to use it for product search and ordering is given. Further user service including information and documentation about the C3S and C3S products are available via the C3S home page (https://climate.copernicus.eu).
Figures and Tables
Figures and tables are provided in the CM SAF Product User Manual [D1].
References
Buehler, S.A. and V.O. John (2005), A Simple Method to Relate Microwave Radiances to Upper Tropospheric Humidity, J. Geophys. Res., 110, D02110, doi:10.1029/2004JD005111
Further references are provided in the CM SAF Product User Manual [D1].
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