Mon Feb 16, F. Flechtner
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Rawat, Shivam, Ganapathy, Abinesh, and Agarwal, Ankit, 2022. Drought characterization over Indian sub–continent using GRACE–based indices. Scientific Reports, 12:15432, doi:10.1038/s41598-022-18511-2.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2022NatSR..1215432R,
author = {{Rawat}, Shivam and {Ganapathy}, Abinesh and {Agarwal}, Ankit},
title = "{Drought characterization over Indian sub-continent using GRACE-based indices}",
journal = {Scientific Reports},
year = 2022,
month = sep,
volume = {12},
eid = {15432},
pages = {15432},
abstract = "{Drought is a natural disaster affects water resources, agriculture, and
social and economic development due to its long-term and
frequent occurrence. It is crucial to characterize and monitor
drought and its propagation to minimize the impact. However,
spatiotemporal assessment of drought characteristics over India
at the sub-basin scale based on terrestrial water storage is
unexplored. In this study, the Terrestrial water storage
anomalies (TWSA) obtained from a Gravity Recovery and Climate
Experiment and precipitation data are used to characterize the
propagation of drought. Combined Climatological Deviation Index
(CCDI) and GRACE-Drought Severity Index (GRACE-DSI) were
computed as CCDI utilizes both precipitation and TWSA data while
GRACE-DSI uses only TWSA data. Our results showed that GRACE-DSI
exhibits significant negative trends over most of the Indian
sub-basins compared to CCDI, indicating that most of the drought
events are due to depletion of TWS. While other sub-basins show
changing trends for GRACE-DSI and CCDI. The number of sub-basins
showing significant negative trends for GRACE-DSI is more than
that for CCDI. Hence TWS is depleting for most of the subbasins
in India. Our results show that Indo-Gangetic plains face many
drought events during 2002-2004, 2009-2014 \& 2015-2017. Maximum
drought duration and drought severity obtained for the area of
North Ladakh (not draining into Indus basins) by GRACE-DSI are
26 months (2002-2004) and {\ensuremath{-}} 44.2835,
respectively. The maximum drought duration and drought severity
obtained for the Shyok sub-basin by CCDI is 17 months
(2013-2015) and {\ensuremath{-}} 13.4392, respectively. Monthly
trend analysis revealed that 39 \& 23 no. of sub-basins show
significant negative GRACE-DSI trends for October and CCDI for
November, respectively. At the same time, the seasonal trend
shows that total 34 and 14 sub-basins exhibited a significant
negative trend at post-monsoon Kharif season for both the GRACE-
DSI \& CCDI, respectively.}",
doi = {10.1038/s41598-022-18511-2},
adsurl = {https://ui.adsabs.harvard.edu/abs/2022NatSR..1215432R},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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