Winter Fog Experiment (WIFEX 2016-17) : Environment for UPSC Exams
Fog is a visible mass consisting of cloud water droplets suspended in the
air or near the Earth’s surface.
The presence of heavy and extended period fog in the northern regions of
India is one of the major weather hazards, impacting aviation, road
transportation, economy and public life in the world’s most densely
Maximum fog occurrence over the Northwest India is about 48 days (visibility
< 1000m) per year, and occurs mostly during the December-February time
Ministry of Earth Sciences (MoES), has taken up a multi-institutional
initiative to conduct an intensive ground-based measurement campaign at the
Indira Gandhi International Airport (IGIA), Delhi, to understand different
physical and chemical features of Fog and factors responsible for its
genesis, intensity and duration.
WIFEX was conducted in a pilot mode at IGIA during last winter, and will be
continued during December 2016 till February 2017.
The main scientific objective of this project is to study the
characteristics and variability of fog events and associated dynamics,
thermodynamics and fog microphysics, with the aim to achieve better
understanding of fog life cycle and ultimately improve capability in fog
Extensive sets of comprehensive ground-based instrumentation, including
remote sensing platforms, are deployed at the IGIA.
Major in-situ sensors are deployed to measure surface micro meteorological
conditions, radiation balance, turbulence, thermo-dynamical structure of the
surface layer, fog droplet and aerosol microphysics, aerosol optical
properties, real time sky images, and aerosol and fog water chemistry to
describe the complete environmental conditions in which fog develops
It is proposed to introduce this model for operational forecasts of Fog for
the winter season of 2017-18.
In addition to Indian Institute of Tropical Meteorology (IITM), Pune,
India Meteorology Department (IMD), National Centre for Medium Range Weather
Forecast (NCMRWF), Airport Authority of India, GMR, Indira Gandhi
International Airport and Indian Institute of Science Education and Research
(IISER) Mohali are also participating in this observational campaign