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Article

Assessment of IMERG Precipitation Estimates over Europe

1
Atmospheric Physics Group (GFA), Department of Applied Physics, Universidad de León, 24071 León, Spain
2
Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA
3
Earth and Space Sciences Group (ESS), Institute of Environmental Sciences (ICAM), University of Castilla-La Mancha, 45071 Toledo, Spain
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(21), 2470; https://doi.org/10.3390/rs11212470
Received: 8 October 2019 / Revised: 21 October 2019 / Accepted: 22 October 2019 / Published: 23 October 2019
(This article belongs to the Section Remote Sensing in Geology, Geomorphology and Hydrology)
This paper evaluates Integrated Multi-Satellite Retrievals from GPM (IMERG-F) over Europe for the period 2014–2018 in order to evaluate application of the retrievals to hydrology. IMERG-F is compared with a large pan-European precipitation dataset built on rain gauge stations, i.e., the ENSEMBLES OBServation (E-OBS) gridded dataset. Although there is overall agreement in the spatial distribution of mean precipitation (R2 = 0.8), important discrepancies are revealed in mountainous regions, specifically the Alps, Pyrenees, west coast of the British Isles, Scandinavia, the Iberian and Italian peninsulas, and the Adriatic coastline. The results show that the strongest contributors to poor performance are pixels where IMERG-F has no gauges available for adjustment. If rain gauges are available, IMERG-F yields results similar to those of the surface observations, although the performance varies by region. However, even accounting for gauge adjustment, IMERG-F systematically underestimates precipitation in the Alps and Scandinavian mountains. Conversely, IMERG-F overestimates precipitation in the British Isles, Italian Peninsula, Adriatic coastline, and eastern European plains. Additionally, the research shows that gauge adjustment worsens the spatial gradient of precipitation because of the coarse resolution of Global Precipitation Climatology Centre data. View Full-Text
Keywords: precipitation; satellite observations; surface observations; IMERG; Europe precipitation; satellite observations; surface observations; IMERG; Europe
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MDPI and ACS Style

Navarro, A.; García-Ortega, E.; Merino, A.; Sánchez, J.L.; Kummerow, C.; Tapiador, F.J. Assessment of IMERG Precipitation Estimates over Europe. Remote Sens. 2019, 11, 2470. https://doi.org/10.3390/rs11212470

AMA Style

Navarro A, García-Ortega E, Merino A, Sánchez JL, Kummerow C, Tapiador FJ. Assessment of IMERG Precipitation Estimates over Europe. Remote Sensing. 2019; 11(21):2470. https://doi.org/10.3390/rs11212470

Chicago/Turabian Style

Navarro, Andrés, Eduardo García-Ortega, Andrés Merino, José L. Sánchez, Christian Kummerow, and Francisco J. Tapiador 2019. "Assessment of IMERG Precipitation Estimates over Europe" Remote Sensing 11, no. 21: 2470. https://doi.org/10.3390/rs11212470

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