https://doi.org/10.1140/epjp/s13360-024-05570-9
Technical Report
A detrended fluctuation analysis to examine the pollutant pattern over Gangetic West Bengal of India
1
Department of Atmospheric Science, University of Calcutta, 51/2 Hazra Road, 700019, Kolkata, India
2
Department of Mathematics, Amity University, Kolkata, Major Arterial Road, Action Area II, Newtown, 700135, Kolkata, India
b surajitchatto@outlook.com, schattopadhyay1@kol.amity.edu
Received:
31
January
2024
Accepted:
20
August
2024
Published online:
18
September
2024
In this paper, we present the results of a careful investigation into the correlational pattern of various pollutants over Kolkata during the months before to the monsoon, which correspond to the pre-lockdown (2019) and lockdown (2020) periods. When Ozone, NOx, SO2, and surface temperature were subjected to detrended fluctuation analysis, we found that the SO2 exhibits long-term positive autocorrelation in the 2019 pre-monsoon. However, during the lockdown, the Hurst exponent (H) dropped below 0.5, which led to the interpretation that the lockdown caused neighbouring pairs to transition between long-term high and low autocorrelation coefficients. Additionally, although the autocorrelation function for NOx resembles a roughly sinusoidal pattern, lockdown has caused a change in H. Using H, fractal dimension and climate predictability, we have analysed the predictability behaviour of the pollutants and temperature under consideration.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
