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A study to improve night time fog detection in the Indo-Gangetic Basin using satellite data and to investigate the connection to aerosols
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ahmed, Rizwan Dey, Sagnik Mohan, Manju |
| Copyright Year | 2015 |
| Abstract | Fog is a socio-economically important weather hazard in the Indo-Gangetic Basin, Northern India, disrupting public life and incurring massive economic loss because of delays in road, rail and air traffic every winter (December-January). Accurate detection of the spatial extent of fog and forecasting of its persistence and dispersion are critical in minimizing this economic loss. In the present study, a satellite based bi-spectral brightness temperature difference (BTD) technique has been applied to detect night time fog over this region during the fog episodes of 2010-2011. The method, validated against ground-based observations from four urban centres (Amritsar, New Delhi, Lucknow and Varanasi), yields 83.9% accuracy in detecting fog for a total 393 satellite overpasses using the operational 2.5 ∘ C BTD threshold. The accuracy further increases to 88.3% with a reduction in the BTD threshold to 1.5 ∘ C. A minimum fog droplet number concentration of 3.23 cm −3 is required to degrade visibility below 1 km in the presence of aerosols at 95% RH in the Indo-Gangetic Basin. The results emphasize the need to improve treatment of aerosols in order to improve forecasting of fog occurrence in this region. |
| Starting Page | 689 |
| Ending Page | 693 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.1002/met.1468 |
| Volume Number | 22 |
| Alternate Webpage(s) | http://web.iitd.ac.in/~sagnik/MA2014.pdf |
| Alternate Webpage(s) | https://doi.org/10.1002/met.1468 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
