An infrared thermography-based study on the variation in diurnal and seasonal land surface temperature at Dibrugarh city
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ORIGINAL ARTICLE
An infrared thermography‑based study on the variation in diurnal and seasonal land surface temperature at Dibrugarh city, India Rituraj Neog1 · Biman Lahkar1 · Juri Baruah1 · Shukla Acharjee1 · Bijoy Shankar Gogoi1 · Borakha Sonowal1 · Dimpal Dutta1 · Dimpee Chetia1 · Jyotishma Baruah1 · Madhusmita Gogoi1 · Minakshi Patar1 · Rajoshree Borah1 · Tulika Das1 Received: 28 January 2020 / Accepted: 2 April 2020 © Springer Nature Switzerland AG 2020
Abstract The understanding of surface urban heat island pattern above Dibrugarh City has been studied through in situ observation using non-contact infrared thermometer for a period of 4 months by covering 16 selected locations. The chosen locations envelop both urban and suburban sites. The study draws attention to urban hot spots toward the central part of the city all through the different months in addition to the seasons, owing to heat retention supported by the built environment with fewer vegetation cover. Seasonally winter uncovered utmost variability of LST indicated by higher CV value. The core locations/ sites witnessed a least amount of variability and continuity of higher LST throughout the learning months. At diurnal pattern, LST designated a sharp decrease from morning to afternoon period through winter months, while contrastingly summer months witnessed a sharp fall of LST from afternoon to night period. Among all the surfaces, asphalt pavement noticed maximum surface temperature with maximum variability in both diurnal and temporal scales. Maximum assimilation with fewer albedo of asphalt surface along with drier soil and grass comes across maximum LST in the internal part of the city. In addition, traffic, pollution and anthropogenic heat emission supported warmer surface temperature of asphalt, grass and bare soil, which on the whole put into the growth of higher surface heat. The stronger affirmative correlation coefficient amid the temperature of different surfaces with air temperature and comparatively weaker unconstructive correlation with relative humidity witnessed the dominant role of air temperature on overall surface urban heat island process. Keywords LST · Diurnal scale · Variability · Surface temperature · Intensity
Introduction Land surface temperature (LST) and its diurnal variation are crucial for the physical, chemical and biological processes of Earth. Climate-related studies were carried out to assess the environmental conditions and management practices on Earth surfaces, and their surrounding atmosphere requires LST information on a useful scale (Becker and Li 1993). Urbanization is a driver which brings a noticeable change in the natural surface of the Earth, and the natural surface is converted from bare soil or green area to the newly built surface (e.g., asphalt, stone, metal, concrete, etc.), thereby causing a change in the land cover. An urban heat island * Rituraj Neog [email protected] 1
Center for Studies in Geography, Dibrugarh University, Dibrugarh, India
is a happening in which urban air temper
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