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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/10867
Title: A study of urban heat island and its association with particulate matter during winter months over Delhi
Authors: Pandey P.
Kumar D.
Prakash A.
Masih J.
Singh M.
Kumar S.
Jain V.K.
Kumar K.
Published in: Science of the Total Environment
Abstract: Day and night time thermal mapping of Delhi has been done with MODIS satellite data for the months of November and December for years 2007, 2008, 2009 and 2010. The study reveals the formation of day time "cool island" over central parts of Delhi which are found to be cooler by a maximum of 4-6°C than the surrounding rural areas. During the night time, however, the central parts of Delhi are found to be warmer by a maximum of 4-7°C or even more than the surrounding rural areas thus confirming the formation of nocturnal urban heat island over Delhi. Measurements of solar spectral irradiance over Delhi reveal significantly lower values as compared to a rural site located south-west of Delhi, during the low wind conditions in the months of November and December. Analysis of average monthly temporal data of surface wind speed and particulate matter concentration over Delhi reveals a strong anti-correlation between wind speed and particulate matter concentration. High values of particulate matter during low wind conditions seem to favor the so called "cool island" over Delhi. Analysis of radiosonde data of 975. hPa and 850. hPa temperatures over Delhi during November and December from 1973 to 2010 reveals a warming trend at the 850. hPa level and an overall declining trend of δT between 975. hPa temperatures and 850. hPa temperatures, thus indicating a weakening of vertical thermal gradients over Delhi during these months. The study suggests that urban areas behave more like moderators of diurnal temperature variation in low wind conditions. © 2011 Elsevier B.V.
Citation: Science of the Total Environment (2012), 414(): 494-507
URI: https://doi.org/10.1016/j.scitotenv.2011.10.043
http://repository.iitr.ac.in/handle/123456789/10867
Issue Date: 2012
Keywords: Particulate matter
Solar irradiance
Urban heat island
ISSN: 489697
Author Scopus IDs: 52763641900
57202478211
7202316466
26323720000
55832946100
57203425772
57203362465
7402676131
Author Affiliations: Pandey, P., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Kumar, D., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Prakash, A., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Masih, J., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India, Chemistry Department, Wilson College, University of Mumbai, Mumbai, India
Singh, M., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Kumar, S., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Jain, V.K., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Kumar, K., School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
Funding Details: The authors would like to thank the Department of Science and Technology (DST), Government of India and the Department of Environment, Government of Delhi for providing financial support for this study. Further, the authors would like to acknowledge the MODIS scientific and data support teams for making the data available. The authors would also like to thank CPCB for the particulate matter data, the University of Wyoming, Department of Atmospheric Sciences for maintaining the atmospheric sounding data and wunderground website ( www.wunderground.com ) for the data on surface wind speed of Delhi. The authors would also like to acknowledge the unknown reviewers for providing constructive suggestions in making this manuscript more meaningful.
Corresponding Author: Kumar, K.; School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India; email: krishan_kumar@mail.jnu.ac.in
Appears in Collections:Journal Publications [ME]

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