This data set is only available for a restricted user group, please contact us if you want to access these data.
RESTRICTED only accessable in CEN/MPI net or via CliSAP login What does that mean?
View data via LAS (HGH 00:00 am) (find the other time steps 3:00, 6:00, etc. under Choose Dataset > ISCCP)
Data access via file system: /data/icdc/atmosphere/isccp
The aim of the International Satellite Cloud Climatology Project" (ISCCP) is to develop a long-term high resolution global data set of cloud parameters. This is done under the umbrella of the "World Climate Research Programme" (WCRP) and "Gloal Energy and Water Experiment" (GEWEX). Data from different satellites sensing the atmosphere of the Earth are used to obtain cloud information which can be used to derive the global cloud coverage, their characteristics and temporal variability as well as their role in the Earths' climate system and its hydrological cycle.
The list of data which is available from ISCCP is impressive (see parameters). It depends on the data product, however. Here we offer ISCCP H-Series HGH = global gridded, 1° resolution, monthly average 3-hourly observations; the ISCCP H-Series HGG data set (as HGH but without the monthly averaging applied = successor of the ISCCP-D1 product) can be obtained on request. HGH is the final level-4 product with monthly temporal resolution and comprises a statistical analysis of the HGG data which in turn are based on the data sets of the individual sensors HGS (see the ATBD and Fig. 2 in Young et al. (2018)).
Available parameters include (among others) coverage (total and of different cloud types), cloud top temperature and pressure, cloud droplet distribution, and opacity. An easy description for the different types of data can be found in the parameter description. More information about the data is given in Young et al. (2018), in the ATBD, and here: https://www.ncdc.noaa.gov/isccp.
Last update of this data set at ICDC: June 13, 2019.
For the HGG product please take a look at the HGG parameter list.
Period and temporal resolution
Coverage and spatial resolution:
The ISCCP H-Series data set includes uncertainty information for the variable "cloud amount" and values of spatial and temporal standard deviations resulting from the gridding of single satellite overpass and/or scene data into the equal area grid as well as from the merging of the different satellite products. In addition, the data set includes information about the theoretically possible and actually used number of data.
This successor data set to the ISCCP D-series products benefits from a number of improvements of particularly the input data sets and with respect to the estimation of uncertainties and the accuracy of the daa products. It is noteworthy that little has changed with regard to the retrieval methodologies used between the D- and the H-series products. We refer to the ATBD and Young et al. (2018) for more information.
The data set is not free of inconsistencies which result from the different spatial coverage of the input satellite data as well as from different viewing geometries which partly seem not to be corrected properly. For example, in some regions and cases the spatial extent of the METEOSAT observation disc can be identified by means of jumps in, e.g., the cloud temperature by 10K or more. While Young et al. (2018) do not provide evidence into this direction, Karlsson and Devasthale (2018) and Tzallas et al. (2019) illustrate that the enhancements applied in the processing of the ISCCP H-series products have not resulted in a global improvement of the quality of this data set compared to the predecessor ISCCP D-series.
NOAA National Centers for Environmental Information (NCEI)
Upon data usage please cite as follows:
Young, A. H., K. R. Knapp, A. Inamdar, W. Hankins, and W. B. Rossow, 2018, The International Satellite Cloud Climatology Project H-Series climate data record product, Earth Syst. Sci. Data, 10, 583-593, https://doi.org/10.5194/essd-10-583-2018 .
Rossow, W.B. and R.A. Schiffer, 1999: Advances in understanding clouds from ISCCP. Bulletin of the American Meteorological Society, 80, 2261-2287. doi: http://dx.doi.org/10.1175/1520-0477(1999)080<2261:AIUCFI>2.0.CO;2
The ISCCP H-Series data were obtained from NOAA's National Centers for Environmental Information (NCEI) under the satellite Climate Data Record Program, https://doi.org/10.7289/V5QZ281S, last accessed: May 24, 2019.