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Abstract:

In this study, an object-based verification method was used to reveal the existence of systematic errors in three satellite precipitation products: Tropical Rainfall Measurement Mission (TRMM), Climate Prediction Center Morphing Technique (CMORPH), and Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks (PERSIANN). Mesoscale convective systems (MCSs) for the austral summer 2002-2003 in the La Plata river basin, southeastern South America, were analyzed with the Contiguous Rain Area (CRA) method. Errors in storms intensity, volume, and spatial location were evaluated. A macroscale hydrological model was used to assess the impact of spatially shifted precipitation on streamflows simulations. PERSIANN underestimated the observed average rainfall rate and maximum rainfall consistent with the detection of storm areas systematically larger than observed. CMORPH overestimated the average rainfall rate while the maximum rainfall was slightly underestimated. TRMM average rainfall rate and rainfall volume correlated extremely well with ground observations whereas the maximum rainfall was systematically overestimated suggesting deficiencies in the bias correction procedure to filter noisy measurements. The preferential direction of error displacement in satellite-estimated MCSs was in the east-west direction for CMORPH and TRMM. Discrepancies in the fine structure of the storms dominated the error decomposition of all satellite products. Errors in the spatial location of the systems influenced the magnitude of simulated peaks but did not have a significant impact on the timing indicating that the system's response to precipitation was mitigating the effect of the errors. Copyright 2011 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Evaluation of mesoscale convective systems in South America using multiple satellite products and an object-based approach
Autor:Demaria, E.M.C.; Rodriguez, D.A.; Ebert, E.E.; Salio, P.; Su, F.; Valdes, J.B.
Filiación:Department of Hydrology and Water Resources and SAHRA, University of Arizona, Harshbarger Bldg. 11, 1133 E. James Rogers Way, Tucson, AZ 85721-0011, United States
Earth System Science Center, National Institute for Space Research, Cachoeira Paulista 12630-000, Brazil
Centre for Australian Weather and Climate Research, Melbourne, VIC 3001, Australia
Centro de Investigaciones Del Mar y la Atmósfera, CONICET/UBA, Universidad de Buenos Aires, Intendente Guiraldes 2160, Piso C1428EGA, Buenos Aires, Argentina
Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, United States
Palabras clave:Climatology; Computer simulation; Errors; Neural networks; Rain gages; Remote sensing; Satellites; Space shuttles; Storms; Systematic errors; Artificial Neural Network; Austral summers; Bias correction; Climate prediction centers; Error decomposition; Fine structures; Ground observations; Hydrological models; Macro scale; Mesoscale Convective System; Morphing techniques; Multiple satellites; Noisy measurements; Object based; PERSIANN; Precipitation estimation from remotely sensed information; Rainfall rates; River basins; Satellite precipitation; Satellite products; Significant impacts; South America; Southeastern South America; Spatial location; Tropical rainfall measurement missions; Verification method; Rain; climate prediction; error analysis; hydrological modeling; mesoscale meteorology; noise; precipitation assessment; rainfall; satellite imagery; spatial analysis; storm; streamflow; South America
Año:2011
Volumen:116
Número:8
DOI: http://dx.doi.org/10.1029/2010JD015157
Título revista:Journal of Geophysical Research Atmospheres
Título revista abreviado:J. Geophys. Res. D Atmos.
ISSN:01480227
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v116_n8_p_Demaria

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Citas:

---------- APA ----------
Demaria, E.M.C., Rodriguez, D.A., Ebert, E.E., Salio, P., Su, F. & Valdes, J.B. (2011) . Evaluation of mesoscale convective systems in South America using multiple satellite products and an object-based approach. Journal of Geophysical Research Atmospheres, 116(8).
http://dx.doi.org/10.1029/2010JD015157
---------- CHICAGO ----------
Demaria, E.M.C., Rodriguez, D.A., Ebert, E.E., Salio, P., Su, F., Valdes, J.B. "Evaluation of mesoscale convective systems in South America using multiple satellite products and an object-based approach" . Journal of Geophysical Research Atmospheres 116, no. 8 (2011).
http://dx.doi.org/10.1029/2010JD015157
---------- MLA ----------
Demaria, E.M.C., Rodriguez, D.A., Ebert, E.E., Salio, P., Su, F., Valdes, J.B. "Evaluation of mesoscale convective systems in South America using multiple satellite products and an object-based approach" . Journal of Geophysical Research Atmospheres, vol. 116, no. 8, 2011.
http://dx.doi.org/10.1029/2010JD015157
---------- VANCOUVER ----------
Demaria, E.M.C., Rodriguez, D.A., Ebert, E.E., Salio, P., Su, F., Valdes, J.B. Evaluation of mesoscale convective systems in South America using multiple satellite products and an object-based approach. J. Geophys. Res. D Atmos. 2011;116(8).
http://dx.doi.org/10.1029/2010JD015157