Ocean Atmosphere Parameters and Fluxes Climatology HOAPS

HOAPS Evaporation 1-July-1987 — HOAPS Evaporation 1 July 1987. Copyright: UHH/CEN/AJB

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Access

RESTRICTED:This link to the data set is only available for a restricted user group. The data set is only accessible in CEN/MPI net or accessible from external nets with a customer account. Please contact ICDC if you would like to access this data from outside the network.

View HOAPS data at LAS
Access HOAPS data via OPeNDAP
Data access via file system: /data/icdc/atmosphere/hoaps/

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Description

The Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data (HOAPS) set is a climatology derived from satellite data of the freshwater budget, near surface wind and humidity, latent heat flux and vertically integrated water vapor over the ice-free oceans. HOAPS 4.0 extends (compared to v3.2) the data coverage from the Special Sensor Microwave / Imager (SSM/I) period to the Special Sensor Microwave Imager and Sounder (SSMIS). The variables are derived from SSM/I and SSMIS passive microwave radiometers, with the exception of the sea-surface temperature, which is taken from the Reynolds data set. The data set includes instantaneous 6-hourly as well as monthly averaged data and is based on a inter-sensor difference calibrated SSM/I-SSMIS FCDR of brightness temperatures. For more information we refer to the Product User Guide, the ATBD and the Validation Report in the references.

All intellectual property rights of the CM SAF products belong to EUMETSAT. The use of these products is granted to every interested user, free of charge. If you wish to use these products, EUMETSAT's copyright credit must be shown by displaying the words "copyright (year) EUMETSAT" on each plot which is created from the product. For citing the used data in a paper please refer to publications of the data record if applicable and use the doi.

Last update of data set at ICDC: July 27, 2018.

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Parameters

Parameters of the HOAPS data set
Name	Unit	Code
Wind speed at 10m height	m/s	wind, SWS
Near surface specific humidity	g/kg	hair, NSH
Precipitation	mm/day	rain, PRE
Latent heat flux	W/m²	late, LHF
Evaporation	mm/day	evap, EVA
Fresh water flux	mm/day	budg, EMP
Vertically integrated water vapour	kg/m²	wvpa, HTW

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Coverage, spatial and temporal resolution

Period and temporal resolution:

07/1987 to 12/2014
Monthly mean, 6-hourly composite

Coverage and spatial resolution:

quasi-global, over the oceans
Spatial resolution: 0.5° x 0.5°, cartesian grid
Geographic longitude: -180°E to 180°E
Geographic latitude: -80°N to 80°N
Dimension: 720 columns x 320 rows
Altitude: 0.0 m

Format:

NetCDF

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Data quality

The data set contains a number of error and uncertainty information such as

standard deviation [monthly data only]
sampling error (a function of satellite overpass density and number of satellites used) [monthly data only]
systematic uncertainty (as a result of standard error propagation)
random uncertainty (as a result of standard error propagation)

Information about how these are retrieved can be found in the ATBD (see references).

In addition to the parameters the data sets also contain

number of days with observations [monthly data only]
observation time [6-hourly data only]
number of observations
satellite bit mask (indicating which satellites are used)

A few final notes:

The product is only derived over sea surfaces; no geophysical parameter is observed within 50 km of any coastline and the sea-ice margin.
All parameters except precipitation are NOT retrieved in presence of strong scattering (such as caused by strong precipitation)
Useful information about the uncertainties, assumptions and limitations can be found in the ATBD, and the validation report (see references).

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Contact

User Help Desk at CM-SAF
http://www.cmsaf.eu/EN/Service/UHD/UHD_node.html
email: contact.cmsaf (at) dwd.de

Stefan Kern
ICDC / CEN / University of Hamburg
E-Mail: stefan.kern"AT"uni-hamburg.de

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References

Manuals Version 4.0:

Manuals Version 3.2:

Literatur:

Andersson, A., et al., 2010: The Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data – HOAPS-3, Earth Syst. Sci. Data, 2, 215-234, doi:10.5194/essd-2-215-2010.
Fairall, C. W., et al., 2003: Bulk parameterization of Air-sea Fluxes: Updates and Verification for the COARE Algorithm, J. Climate, 16, 571–591, doi:10.1175/1520-0442(2003)016<0571:BPOASF>2.0.CO;2.
Schröder, M., et al., 2013: The CM SAF SSM/I-based total column water vapour climate data record: methods and evaluation against re-analyses and satellite. Atmos. Meas. Tech., 6, 765–775, doi:10.5194/amt-6-765-2013.
Schröder, M., et al., 2016: The GEWEX water vapor assessment (G-VAP) – results from the trend and homogeneity analysis. J. Applied Meteor. Clim., 55(7), 1633-1649, doi:10.1175/JAMC-D-15-
0304.1.

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Data citation

Please cite the data as follows:

Andersson, Axel; Graw, Kathrin; Schröder, Marc; Fennig, Karsten; Liman, Julian; Bakan, Stephan; Hollmann, Rainer; Klepp, Christian (2017): Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data - HOAPS 4.0, Satellite Application Facility on Climate Monitoring, DOI:10.5676/EUM_SAF_CM/HOAPS/V002, http://dx.doi.org/10.5676/EUM_SAF_CM/HOAPS/V002

All intellectual property rights of the CM SAF products belong to EUMETSAT. The use of these
products is granted to every interested user, free of charge. If you wish to use these products,
EUMETSAT's copyright credit must be shown by displaying the words "copyright (year)
EUMETSAT" on each plot which is created from the product. For citing the used data in a paper
please refer to publications of the data record if applicable and use the doi.

and with the following acknowledgments:

Thanks to ICDC, CEN, University of Hamburg for data support.

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