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DOI | 10.1016/j.atmosres.2017.11.018 |
On the theoretical aspects of improved fog detection and prediction in India | |
Dey, Sagnik1,2 | |
2018-04-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 202页码:77-80 |
文章类型 | Article |
语种 | 英语 |
国家 | India; USA |
英文摘要 | The polluted Indo-Gangetic Basin (IGB) in northern India experiences fog (a condition when visibility degrades below 1 km) every winter (Dec-Jan) causing a massive loss of economy and even loss of life due to accidents. This can be minimized by improved fog detection (especially at night) and forecasting so that activities can be reorganized accordingly. Satellites detect fog at night by a positive brightness temperature difference (BTD). However, fixing the right BTD threshold holds the key to accuracy. Here I demonstrate the sensitivity of BTD in response to changes in fog and surface emissivity and their temperatures and justify a new BTD threshold. Further I quantify the dependence of critical fog droplet number concentration, N-F (Le. minimum fog concentration required to degrade visibility below 1 km) on liquid water content (LWC). N-F decreases exponentially with an increase in LWC from 0.01 to 1 g/m(3), beyond which it stabilizes. A 10 times low bias in simulated LWC below 1 g/m(3) would require 10(7) times higher aerosol concentration to form the required number of fog droplets. These results provide the theoretical aspects that will help improving the existing fog detection algorithm and fog forecasting by numerical models in India. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426226500008 |
WOS关键词 | MEGACITY DELHI ; AEROSOL ; VISIBILITY ; POLLUTION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/15216 |
专题 | 地球科学 |
作者单位 | 1.Indian Inst Technol Delhi, Ctr Atmospher Sci, New Delhi 110016, India; 2.Univ Illinois, Dept Atmospher Sci, Urbana, IL 61801 USA |
推荐引用方式 GB/T 7714 | Dey, Sagnik. On the theoretical aspects of improved fog detection and prediction in India[J]. ATMOSPHERIC RESEARCH,2018,202:77-80. |
APA | Dey, Sagnik.(2018).On the theoretical aspects of improved fog detection and prediction in India.ATMOSPHERIC RESEARCH,202,77-80. |
MLA | Dey, Sagnik."On the theoretical aspects of improved fog detection and prediction in India".ATMOSPHERIC RESEARCH 202(2018):77-80. |
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