Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/20.500.11765/1319
The impact of the tracer size and the temporal gap between images in the extraction of atmospheric motion vectors
Título : The impact of the tracer size and the temporal gap between images in the extraction of atmospheric motion vectors
Autor : García Pereda, JavierBorde, Régis
Palabras clave : Atmospheric motion vector; Satellite images; Water vapor; Vector de movimiento atmosférico; Viento; Observaciones de satélite
Fecha de publicación : 2014
Editor: American Meteorological Society
Citación : Journal of Atmospheric and Oceanic Technology. 2014, 31(8) p. 1761–1770
Versión del editor: https://dx.doi.org/10.1175/JTECH-D-13-00235.1
Resumen : The goal of this paper is to show the impact of the tracer size and the temporal gap between images in atmospheric motion vector (AMV) extraction schemes. A test has been performed using NWC SAF/High Resolutions Winds AMV software for different configurations with a tracer size varying between 8 × 8 and 40 × 40 pixels and a temporal gap between images varying between 5 and 90 min. AMVs have been extracted for four different MSG/SEVIRI channels (HRVIS, VIS0.8, WV6.2, and IR10.8) over the European and Mediterranean area for a 6-month period (January–June 2010). The AMV performances have been tested against radiosonde winds and ECMWF model analysis winds. The results show a small impact of the tracer size on the number of valid AMVs, which is, however, more significant for clear air AMVs, and a significant impact of the temporal gap between images. The largest number of valid AMVs has been found in general for a temporal gap of 5 min for the 1-km pixel scale and for a temporal gap of 10 min for the 3-km pixel scale. Results also show a decrease of the mean AMV speed and the normalized BIAS (NBIAS) with larger tracer sizes, and a relatively small impact of the temporal gap on these parameters. Finally, the results show minimum values of the normalized root-mean-square vector difference (NRMSVD) for intermediate temporal gaps between 15 and 30 min with a relatively small impact of the tracer size on this parameter.
URI : http://hdl.handle.net/20.500.11765/1319
ISSN : 0739-0572
1520-0426
Colecciones: Artículos científicos 2010-2014


Ficheros en este ítem:
  Fichero Descripción Tamaño Formato  
Paper_Tracersize_Temp...
789 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo del ítem



Los ítems de Arcimís están protegidos por una Licencia Creative Commons, salvo que se indique lo contrario.

Repositorio Arcimís
Nota Legal Contacto y sugerencias