Digital Object Identifier
Entry information for CLARA_AVHRR_V002_01

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Title

CLARA-A2.1: CM SAF cLoud, Albedo and surface RAdiation dataset from AVHRR data - Edition 2.1

Citation

Karlsson, Karl-Göran; Anttila, Kati; Trentmann, Jörg; Stengel, Martin; Solodovnik, Irina; Meirink, Jan Fokke; Devasthale, Abhay; Kothe, Steffen; Jääskeläinen, Emmihenna; Sedlar, Joseph; Benas, Nikos; van Zadelhoff, Gerd-Jan; Stein, Diana; Finkensieper, Stephan; Håkansson, Nina; Hollmann, Rainer; Kaiser, Johannes; Werscheck, Martin (2020): CLARA-A2.1: CM SAF cLoud, Albedo and surface RAdiation dataset from AVHRR data - Edition 2.1, Satellite Application Facility on Climate Monitoring, DOI:10.5676/EUM_SAF_CM/CLARA_AVHRR/V002_01, https://doi.org/10.5676/EUM_SAF_CM/CLARA_AVHRR/V002_01.

Publisher

Satellite Application Facility on Climate Monitoring (CM SAF)

Publication year

2020

Author(s)

Karlsson, Karl-Göran; Anttila, Kati; Trentmann, Jörg; Stengel, Martin; Solodovnik, Irina; Meirink, Jan Fokke; Devasthale, Abhay; Kothe, Steffen; Jääskeläinen, Emmihenna; Sedlar, Joseph; Benas, Nikos; van Zadelhoff, Gerd-Jan; Stein, Diana; Finkensieper, Stephan; Håkansson, Nina; Hollmann, Rainer; Kaiser, Johannes; Werscheck, Martin

Description

The CLARA-A2.1 record provides cloud properties, surface albedo and surface radiation parameters derived from the AVHRR sensor onboard polar orbiting NOAA and METOP satellites. It includes and temporally extends the second version of the record (Karlsson et al., 2016; CLARA-A2 DOI:10.5676/EUM_SAF_CM/CLARA_AVHRR/V002) now providing data from 1982/01 to 2019/06, i.e., for 37.5 years. Original visible radiances were inter-calibrated and homogenised, using MODIS data as a reference, before applying the various parameter retrievals. The inter-calibration was based on an original method introduced by Heidinger et al. (2010) which was updated (MODIS Collection 6) and extended. CLARA-A2.1 features a range of cloud products: cloud mask, cloud top temperature/pressure/height, cloud thermodynamic phase, and (for liquid and ice clouds separately) cloud optical thickness, particle effective radius and cloud water path. Cloud products are available as monthly and daily averages and also as daily resampled global products (Level 2b) for individual satellites. Cloud parameter results are also presented as multi-parameter distributions (i.e., joint frequency histograms of cloud optical thickness, cloud top pressure and cloud phase) for daytime conditions. Surface albedo is presented as monthly and pentad (5 day) averages of the broadband black-sky albedo and is derived using all available data during the studied period. Surface radiation products are provided as monthly averages for the downwelling shortwave (including also daily averages) and the down- and upwelling longwave components. The monthly and daily averages are available on a 0.25°x0.25° global grid. Surface albedo and cloud products are also provided in two equal area grids with a resolution of 25 km x 25 km covering the polar regions. Daily resampled cloud products (level 2b) are provided in a global grid with a resolution of 0.05°x0.05°. For the latter, also a probabilistic cloud mask is added as an experimental product. A summary of the CLARA-A2.1 characteristics and a comprehensive evaluation of the data are available through a comprehensive set of documentations documents including user guides and, algorithm descriptions.

Format

NetCDF-4

Version

2.1

Temporal coverage

1982-01-01 - 2019-06-30

Geographic coverage

Latitude: -90.0° S to 90.0° N
Longitude: -180.0° W to 180.0° E

Size

14.2 TiB

Documentation

Related publications

Auxiliary data

Related Data Records

Comment

This Thematic Climate Data Record is extended by the ICDR AVHRR - based on CLARA-A2 methods. Within the scope of the Copernicus Climate Change Service (C3S), reflected shortwave and net fluxes based on CLARA-A2 were calculated as complimentary data for the convenience of users. These are available via the Copernicus Data Store.

Data record details and ordering

Products from Polar Orbiting Satellites (LEO)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Surface albedo (SAL)

Surface downward longwave radiation (SDL)

Surface incoming shortwave radiation (SIS)

Surface outgoing longwave radiation (SOL)

Products from METOP A

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from METOP B

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 7 (NOAA-7)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 9 (NOAA-9)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 11 (NOAA-11)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 12 (NOAA-12)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 14 (NOAA-14)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 15 (NOAA-15)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 16 (NOAA-16)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 17 (NOAA-17)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 18 (NOAA-18)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)

Products from NOAA POES 19 (NOAA-19)

Cloud mask (CMA)

Cloud phase (CPH)

Cloud top parameters CTT, CTP and CTH (CTO)

Cloud water path (CWP)

Fractional cloud cover (CFC)

Ice water path (IWP)

Joint cloud property histograms (JCH)

Liquid water path (LWP)