HOAPS and ERA-Interim precipitation over sea: Validation against shipboard in-situ measurements

Bumke, Karl, König-Langlo, Gert, Kinzel, Julian and Schröder, Marc (2016) HOAPS and ERA-Interim precipitation over sea: Validation against shipboard in-situ measurements Atmospheric Measurement Techniques, 9 (5). pp. 2409-2423. DOI 10.5194/amt-9-2409-2016.

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The satellite-derived HOAPS (Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data) and ECMWF (European Centre for Medium-Range Weather Forecasts) ERA-Interim reanalysis data sets have been validated against in situ precipitation measurements from ship rain gauges and optical disdrometers over the open ocean by applying a statistical analysis for binary estimates. For this purpose collocated pairs of data were merged within a certain temporal and spatial threshold into single events, according to the satellites' overpass, the observation and the ERA-Interim times. HOAPS detects the frequency of precipitation well, while ERA-Interim strongly overestimates it, especially in the tropics and subtropics. Although precipitation rates are difficult to compare because along-track point measurements are collocated with areal estimates and the number of available data are limited, we find that HOAPS underestimates precipitation rates, while ERA-Interim's Atlantic-wide average precipitation rate is close to measurements. However, when regionally averaged over latitudinal belts, deviations between the observed mean precipitation rates and ERA-Interim exist. The most obvious ERA-Interim feature is an overestimation of precipitation in the area of the intertropical convergence zone and the southern subtropics over the Atlantic Ocean. For a limited number of snow measurements by optical disdrometers, it can be concluded that both HOAPS and ERA-Interim are suitable for detecting the occurrence of solid precipitation.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
DOI etc.: 10.5194/amt-9-2409-2016
ISSN: 1867-1381
Date Deposited: 09 Feb 2016 09:58
Last Modified: 04 May 2017 11:15
URI: http://eprints.uni-kiel.de/id/eprint/31300

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