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Evidence of asymmetric change in diurnal temperature range in recent decades over different agro-climatic zones of India

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dc.contributor.authorMall, Rajesh Kumar
dc.contributor.authorChaturvedi, Manisha
dc.contributor.authorSingh, Nidhi
dc.contributor.authorBhatla, Rajeev
dc.contributor.authorSingh, Ravi Shankar
dc.contributor.authorGupta, Akhilesh
dc.contributor.authorNiyogi, Dev
dc.date.accessioned2025-01-30T06:05:01Z
dc.date.available2025-01-30T06:05:01Z
dc.date.issued2021
dc.description.abstractDiurnal temperature range (DTR) is an important indicator of climatic change and a critical thermal metric to assess the impact on agriculture and human health. This study investigates the seasonal, annual and decadal changes in the spatio-temporal trend in DTR and air temperatures (maximum: Tmax and minimum: Tmin) during 1951�2016 and solar radiation (Srad) during 1984�2016 over 14 different agro-climatic zones (ACZs) in India. The changes in the DTR trend between two time periods:1951�2016 and 1991�2016 (recent period) are also assessed. The results indicate an overall increasing trend in DTR (0.038�C/decade), Tmax (0.078�C/decade, significant), Tmin (0.049�C/decade) during 1951�2016 and Srad (0.10 MJ/m2/day/decade) during 1984�2016. However, a decreasing trend in DTR (?0.02�C/decade) and a significant increasing trend in Tmin (0.210�C/decade) was noted during 1991�2016. The decadal changes showed an evident decline in DTR during the recent period since 1991. The relative increase in Tmin (0.21�C/decade, significant) compared to Tmax (0.18�C/decade) resulted in a decreasing DTR trend. This was evident across the 5 out of the 14 agro-climatic zones for the 1991�2016 period. The seasonal analysis showed a significant (95%) increasing trend in DTR during pre-monsoon and monsoon (1951�2016), and a negative trend for the post-monsoon and monsoon since 1991. There were also interesting spatial differences found with the ACZs in the north-west, parts of Gangetic plain, north-east, and central India exhibiting negative DTR trends. The effect of Srad is larger on Tmax than Tmin; therefore, the decrease in Srad in parts of Gangetic plain likely contributed to a smaller increase in Tmax relative to Tmin and led to a decreasing trend in DTR. At the same time, the west coast, east coast, and southern region show positive trends. The observational analysis finds a distinct increase in the Tmin and also highlights the need for future assessments to continue investigate the causes of these spatio-temporal changes found in this study. � 2020 Royal Meteorological Society
dc.identifier.doihttps://doi.org/10.1002/joc.6978
dc.identifier.issn8998418
dc.identifier.urihttps://dl.bhu.ac.in/ir/handle/123456789/25212
dc.publisherJohn Wiley and Sons Ltd
dc.subjectagro-climatic zones
dc.subjectdecadal changes
dc.subjectdiurnal temperature range
dc.titleEvidence of asymmetric change in diurnal temperature range in recent decades over different agro-climatic zones of India
dc.typeArticle
dspace.entity.typePublication
journal.titleInternational Journal of Climatology
journalvolume.identifier.volume41

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2021