Trends from 120-year data indicate land use pattern influence degree of rainfall: Study

A latest study based on 120year data has found that manmade longterm shifting of landuse and landcover LULC patterns and most significantly urbanization play a crucial role in the prediction of the longterm trends of extreme precipitation events particularly of the intensity of extremesThe current spatial and temporal extremes of southwest monsoon have perplexed many with central and southern peninsular India receiving far excess rains and IndoGangetic belt receiving large deficit But this is not the only year it has happenedWhile in certain regions thermodynamical circulation and convective instability parameters are also found to be key predicting factors mostly of the frequency of the precipitation extremes said the study The rise of Indian summer monsoon precipitation extremes and its correlation with longterm changes of climate and anthropogenic factors published in NatureResearchers Renaud Falga and Chien Wang from Laboratoire dAerologie University of Toulouse III France analysed the trends of extreme precipitation events during the Indian summer monsoon measured by two different indicators thresholdbased rainfall extreme indicators ie the frequency and the intensity for the period 19012020 covering entire India in nine regions segregated by a clustering analysis based on rainfall characteristics using the India Meteorological Department IMD highresolution gridded dataIt is no secret that the amount and distribution of precipitation during the Indian summer monsoon ISM has a substantial impact on the regions agricultural systems and thus the livelihood of more than a billion peopleThese climatological parameters have high interannual and interdecadal variabilities Nevertheless there is a high probability that manmade global or regional climate changes could have also affected these quantities with an extent yet to be examined While the overall ISM rainfall is believed to have decreased during the twentieth century then reversed since the turn of this century it has been indicated that the extreme precipitation events might have been rising in some parts of India with hypothesized causes ranging from urbanisation increase in dew point temperature to climate variability the study saidAlso read Land belongs to Hindu deity Aadi Vishweshwar Mahadev says counsel for petitioners in Gyanvapi caseInstead of focusing on a few selected locations the researchers analysed nine regions segregated using a clustering method based on precipitation charactersIt is found that the majority of India has experienced a statistically significant increase of monsoon precipitation extremes throughout the analyzed 120year period the study pointed outThe scientists also analysed effective predicting factors behind such an increase using a nonlinear and multivariate machine learning regression describing anthropogenic activities climate dynamical and physical processes and variabilities among other thingsThe results reveal that the manmade land use land cover changes LULC appear to be the most critical features in predicting the observed climatological trends of monsoonal precipitation extremes implying implicitly that these features might have played an important role in causing the discovered rise of monsoonal precipitation extremes particularly of their intensity they saidThe study also spoke about which indicators did and which were not found to be correlated to the trends of precipitation extremes than expectedThis story has been sourced from a third party syndicated feed agencies Midday accepts no responsibility or liability for its dependability trustworthiness reliability and data of the text Midday managementmiddaycom reserves the sole right to alter delete or remove without notice the content in its absolute discretion for any reason whatsoever