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Spatio-temporal analysis of land surface temperature for identification of heat wave risk and vulnerability hotspots in Indo-Gangetic Plains of India

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Abstract

The increasing frequency of heat waves (HW) in many parts of the world is emerging as one of the climatic vulnerabilities across the world resulting in elevated thermal stress and high mortality. With increase in HW intensity, frequency and duration at global level, India has seen several major HW events in the last decade. HW conditions have mostly been studied by analysing ground-based observations; however, this approach lacks information on spatial variability at the local scale, which is not adequate to identify HW risk and vulnerability hotspots. In this study, gridded analysis of spatio-temporal variability of HW indices has been carried out by utilising freely available Moderate Resolution Imaging Spectrometer (MODIS) Land Surface Temperature (LST) data on Google Earth Engine (GEE) platform in the Indo-Gangetic Plains of India. HW indices to analyse duration, frequency and intensity of HW have been identified and further computed on a grid size of 10 km*10 km area. HW risk and vulnerability hotspot in the study region have been identified by spatial modelling of HW indices, LULC change and population density. The HW risk and vulnerability hotspot layer identified NCT Delhi and its surrounding region at the highest risk of HW with high vulnerability. A strong positive correlation of variability of HW indicators with increasing built-up shows that built-up surfaces affect strongly the HW conditions.

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source: Rodgers & Panwar, 1988) and (B) agro-climate zones (source: Mandal et al., 2016)

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Data availability

The findings of the study were derived from the openly available dataset from following resources available in the public domain: [Aqua MODIS daily LST (https://earthengine.google.com/platform/), temporal LULC map (https://bhuvan-app1.nrsc.gov.in/thematic/thematic/index.php#), and population data from Global Human Settlement Layer (GHSL) (https://ghsl.jrc.ec.europa.eu/download.php?ds=pop)]. Derived data that support the findings of this study are available on request from the corresponding author (Gupta K.)

Code availability

Code developed as part of this study is a copyright material of the Indian Institute of Remote Sensing, ISRO, India. It can be shared to interested researchers on request by the corresponding author (Gupta K.).

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Acknowledgements

The authors are thankful to Director IIRS and Chairman ISRO for the encouragement and facilitating the work. The work has been carried out as part of the M. Tech. Dissertation work. The EO data from USGS, GHSL, Bhuvan and Google Earth Engine is acknowledged.

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All authors whose names appear on the submission have made substantial contributions to the conception or design of the work; the acquisition, analysis, or interpretation of data; or the creation of code used in the work. All authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Corresponding author

Correspondence to Kshama Gupta.

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The work is carried out at the Indian Institute of Remote Sensing/ISRO, Dehradun, as part of ongoing research. All datasets used in this study area available in public domain from the following resources: Aqua MODIS daily LST (https://earthengine.google.com/platform/), temporal LULC map (https://bhuvan-app1.nrsc.gov.in/thematic/thematic/index.php#) and population data from Global Human Settlement Layer (GHSL) (https://ghsl.jrc.ec.europa.eu/download.php?ds=pop). All the research articles has been cited appropriately in the manuscript as per the defined style and format.

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Consent to participate is not applicable for this study and it is entirely based on analysis of spatial data and does not include any human or live participants.

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Consent for publication is not applicable as no human or live participant has been utilised to carry out this study.

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The authors declare no competing interests.

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Rao, P., Gupta, K., Roy, A. et al. Spatio-temporal analysis of land surface temperature for identification of heat wave risk and vulnerability hotspots in Indo-Gangetic Plains of India. Theor Appl Climatol 146, 567–582 (2021). https://doi.org/10.1007/s00704-021-03756-0

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  • DOI: https://doi.org/10.1007/s00704-021-03756-0

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