Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation

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dc.contributor.author Oza, Harsh
dc.contributor.author Padhya, Virendra
dc.contributor.author Ganguly, Akash
dc.contributor.author Saikranthi, K.
dc.contributor.author Rao, T. N.
dc.contributor.author Deshpande, R. D.
dc.date.accessioned 2020-02-22T06:10:46Z
dc.date.available 2020-02-22T06:10:46Z
dc.date.issued 2020-01
dc.identifier.citation Oza, Harsh; Padhya, Virendra; Ganguly, Akash; Saikranthi, K.; Rao, T. N. and Deshpande, R. D., "Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation", Climate Dynamics, DOI: 10.1007/s00382-020-05136-2, Jan. 2020. en_US
dc.identifier.issn 0930-7575
dc.identifier.issn 1432-0894
dc.identifier.uri https://doi.org/10.1007/s00382-020-05136-2
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/5138
dc.description.abstract Long term (2005�2016) daily precipitation isotope data (?18O, ?D and d-excess) from Ahmedabad in semi-arid Western India are examined in light of various meteorological parameters and air parcel trajectories to identify prominent patterns in the isotopic character and discern the underlying hydrometeorological processes. One of the most prominent and systematic annual patterns is the isotopic depletion (average ?18O: ??2.5� in Jun�Jul; ??5.2� in Aug�Sept) in the second half of the Indian Summer Monsoon (ISM), which is observed in the 11 out of the 12 years of this study. Four geographically feasible causal factors have been examined if they contribute to observed late monsoon isotopic depletion. These factors are: (1) increased contribution of terrestrially recycled vapor; (2) intra-seasonal change in sea-surface, surface-air and cloud base temperatures; (3) increased rain-out fraction from marine vapor parcel; and (4) increase in relative proportion of convective rain. It is inferred from the present study that isotopic depletion in the second half of ISM is associated with: (1) increased contribution (45% from 36%) of terrestrially recycled moisture; (2) 1.9� C lower cloud base temperature; (3) increased rainout fraction due to decreased wind velocity (6.9 m/s from 8.8 m/s); and (4) an increase of 22.3% in the proportion of convective rain. Daily rain events with atypical isotopic composition (20�?<?d-excess?<?0�) are ascribed mainly to local weather perturbations causing sudden updraft of moist air facilitating terrestrial recycling of water vapor.
dc.description.statementofresponsibility by Harsh Oza, Virendra Padhya, Akash Ganguly, K. Saikranthi, T. N. Rao and R. D. Deshpande
dc.language.iso en_US en_US
dc.publisher Springer en_US
dc.subject Stable isotopes en_US
dc.subject Precipitation en_US
dc.subject Western India en_US
dc.subject Indian summer monsoon en_US
dc.subject Recycling en_US
dc.title Hydrometeorological processes in semi-arid western India: insights from long term isotope record of daily precipitation en_US
dc.type Article en_US
dc.relation.journal Climate Dynamics


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