TITLE:
Diurnal Evolution of Urban Heat Island and Its Impact on Air Quality by Using Ground Observations (SAFAR) over New Delhi
AUTHORS:
Mohammed Yusuff Aslam, Karumuri Rama Krishna, Gufran Beig, Mohammed Iqbal Rasul Tinmaker, Dilip Motiram Chate
KEYWORDS:
UHI, PM2.5, PBLH, Wind Speed, GHF
JOURNAL NAME:
Open Journal of Air Pollution,
Vol.6 No.2,
May
31,
2017
ABSTRACT: The paper presents a study of urban heat island (UHI)
intensity and its impact on air quality by using the System of Air Quality
Forecasting and Research (SAFAR) network observations over Delhi during the
clear sky month of December of 2013 and 2015. It is found that in the
month of December 2013 and 2015 the UHI shows a peak in late evening around
20:00 hrs. The concentration of PM2.5 shows a bimodal peak in the
month of December of both the years 2013 and 2015 which is due to the enhanced
anthropogenic activity during the traffic hours. The formation of UHI during
the late evening traffic hours is due to the enhancement in the concentration
of PM2.5 due to the enhanced anthropogenic activity with higher
ground heat flux and lower PBLH and wind speed which leads to both the years
2013 and 2015 during the month of December. It is also found that UHI intensity
shows a positive correlation (r = 0.57) with PM2.5 concentration and
a negative correlation (r = -0.40) with wind speed and the PM2.5 concentration also shows a negative correlation (r = -0.57) with wind speed
during December 2013. Whereas during December 2015 it has found that UHI
intensity has a positive correlation (r = 0.65) with PM2.5 concentration and a negative correlation (r = -0.45) with wind speed and the PM2.5 concentration also shows a negative correlation (r = -0.57) with wind speed.