speaker

Dr. Ajanta Goswami

Assistant Professor

Department of Earth Sciences

Indian Institute of Technology Roorkee

email: ajanta.fes[at]iitr.ac.in

Brief Introduction

Abstract

Urban heat island characterization and heat wave analysis over Gujrat, India: India has experienced unprecedented rate of urbanization over the last three decades with a current urban population of 31.36 %. As per United Nation’s world population report, India will host an urban population of around 40.76% by 2030. It is projected that with the present urbanization rate of 1.1%, India will have the highest urban population of 814 million by 2050 in the world. Hence, for the sustainable development and adap- tation of urban population to climate change, it is essential to study the urban problems effecting the human health as well as climate. One of the most important effect observed is Urban Heat Island (UHI). The differ- ence in land surface temperature (LST) between an urban region and its nearby non-urban region, known as surface urban heat island intensity (SUHII), is usually positive as reported in many studies. Moderate Res- olution Imaging Spectroradiometer (MODIS) land surface temperature is used to study the urban heat island effect over the major cities of Gujarat. A Gaussian-fitting algorithm is performed to characterize the heat island signature in terms of its magnitude, spatial extent, central location and orientation with respect to the surrounding rural region. In this study we used MOD11A2 land surface temperature and emissivity product to study the urban heat island effect over the major cities of Gujarat. The study reveals an overall increasing trend in the UHI magnitude for a pe- riod of last 15 years from 2001 to 2016. The mean UHI magnitude of Ahmedabad is 4.9°C, which is highest among all the cities. Rajkot (3.7°C), Vadodara (3.2°C) and Gandhinagar (3.1°C) have also high value of UHI magnitude. Surat (2.5°C) and Bhavnagar (2.4°C) has comparatively low value of UHI as compared to other cities. Dahod (1.3°C) has least value of UHI magnitude over the period. Ahmedabad witness a growth of around 25.8% UHI spatial extent while Dahod shows only 5.9%. The presenta- tion on this topic will cover the characterization of UHI and heat wave for Gujarat states. The research work dovetails with the smart city project of government of India.