HOAPS precipitation validation with ship-borne rain gauge measurements over the Baltic Sea

Bumke, Karl, Fennig, Karsten, Strehz, Alexander, Mecking, Rebekka and Schröder, Marc (2012) HOAPS precipitation validation with ship-borne rain gauge measurements over the Baltic Sea Tellus Series A: Dynamic meteorology and oceanography , 64 (18486). DOI 10.3402/tellusa.v64i0.18486.

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Abstract

Global ocean precipitation is an important part of the water cycle in the climate system. A number of efforts have been undertaken to acquire reliable estimates of precipitation over the oceans based on remote sensing and reanalysis modelling. However, validation of these data is still a challenging task, mainly due to a lack of suitable in situ measurements of precipitation over the oceans. In this study, validation of the satellite-based Hamburg Ocean Atmosphere Parameters and fluxes from Satellite data (HOAPS) climatology was conducted with in situ measurements by ship rain gauges over the Baltic Sea from 1995 to 1997. The ship rain gauge data are point-to-area collocated against the HOAPS data. By choosing suitable collocation parameters, a detection rate of up to about 70% is achieved. Investigation of the influence of the synoptic situation on the detectability shows that HOAPS performs better for stratiform than for convective precipitation. The number of collocated data is not sufficient to validate precipitation rates. Thus, precipitation rates were analysed by applying an interpolation scheme based on the Kriging method to both data sets. It was found that HOAPS underestimates precipitation by about 10%, taking into account that precipitation rates below 0.3 mm h−1 cannot be detected from satellite information.

Document Type: Article
Keywords: Meteorology; Precipitation; ship rain gauge; satellite; validation; HOAPS
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
DOI etc.: 10.3402/tellusa.v64i0.18486
ISSN: 1600-0870
Date Deposited: 11 May 2012 12:49
Last Modified: 14 Jun 2016 12:04
URI: http://eprints.uni-kiel.de/id/eprint/14280

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