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Title (Primary) Flash droughts identification based on an improved framework and their contrasting impacts on vegetation over the Loess Plateau, China
Author Zheng, X.; Huang, S.; Peng, J.; Leng, G.; Huang, Q.; Fang, W.; Guo, Y.
Journal Water Resources Research
Year 2022
Department RS
Volume 58
Issue 9
Page From e2021WR031464
Language englisch
Topic T5 Future Landscapes
Data links https://doi.pangaea.de/10.1594/PANGAEA.939631
Supplements https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2021WR031464&file=2021WR031464-sup-0001-Supporting+Information+SI-S01.pdf
Keywords Flash drought; identification framework; rate of intensification; GPP; impact; loess plateau
Abstract Flash drought occurs in a short timescale and has more adverse impacts on society and ecosystems than regular drought. Considering flash drought as a special type of regular drought and identifying it by the rate of the first intensification period might ignore posterior intensification periods. To this end, we introduced the combinatorial decomposable flash drought identification framework (CDFDI) to identify flash drought from the perspective of regarding it as the subphase of drought and explore the characteristics and vegetation response of flash drought in the Loess Plateau (LP), China, where is prone to drought and its ecological environment is very fragile. The effectiveness of the framework is evaluated through the comparison analysis with a pre-existing identification method proposed by Liu et al., (2020a). Results indicate that: (1) the CDFDI framework can better capture flash drought events than the Liu’s method in terms of time series and spatial patterns, its rationality was further demonstrated by the obvious latitudinal pattern of correlation between flash drought and NDVI; (2) the correlation shows an southeast (positive) and northwest (negative) contrasting pattern in the LP; (3) such contrasting pattern was also found in the response time of GPP, which suggests a more rapid impact on vegetation of flash drought in the arid northwestern LP; and (4) flash drought shows an exacerbating trend across the LP under the background of climate warming and mainly concentrated in the southern part. In general, this study provides new insights on flash drought connotations in a changing environment.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26609
Zheng, X., Huang, S., Peng, J., Leng, G., Huang, Q., Fang, W., Guo, Y. (2022):
Flash droughts identification based on an improved framework and their contrasting impacts on vegetation over the Loess Plateau, China
Water Resour. Res. 58 (9), e2021WR031464