Open AccessNight time fog detection using MODIS data over Northern India
Author(s) -
Chaurasia Sasmita,
Sathiyamoorthy V.,
Paul Shukla Bipasha,
Simon B.,
Joshi P. C.,
Pal P. K.
Publication year - 2011
Publication title -
meteorological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 59
eISSN - 1469-8080
pISSN - 1350-4827
DOI - 10.1002/met.248
Subject(s) - geostationary orbit , environmental science , meteorology , thresholding , remote sensing , satellite , brightness temperature , climatology , brightness , geology , computer science , geography , physics , optics , aerospace engineering , artificial intelligence , engineering , image (mathematics)
An algorithm for night time fog detection using satellite data was used to study 2009 and 2010 fog episodes over the North Indian plains. The algorithm employs a bispectral thresholding technique involving brightness temperature difference (BTD) between two spectral channels: 3.9 and 10.75 µm, combining radiative transfer simulations and satellite data. The prolonged fog episode of January 2010 was analysed in detail using this algorithm in conjunction with the meteorological parameters and it was found that upper tropospheric long waves passed over this region during the fog episode. These waves affect the circulation close to the surface and appear to have played an important role in the formation and persistence of fog during 2010. The present thresholding method can be used to monitor night time fog over the Indian subcontinent on an operational basis using the forthcoming geostationary satellite INSAT‐3D. Copyright © 2011 Royal Meteorological Society