Dynamic Variations of Agricultural Drought and Its Response to Meteorological Drought: A Drought Event‐Based Perspective

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(12)

Published: June 22, 2024

Abstract The dynamic variations of agricultural drought can reflect the water shortage situation system, and there is a progressive relationship in response to meteorological on spatiotemporal scale. In this study, vegetation health index standardized precipitation evapotranspiration were adopted as indicators, respectively. Additionally, using three‐dimensional clustering technology, evolutions typical events clarified, characteristics revealed. results indicated that: (a) 81 North China Plain (NCP) during 1982–2020, with largest severity (12.82 × 10 4 month km 2 ), 6‐month duration, 23.24 affected area occurring No. event; (b) from 1980s 2010s, gradually decreased large‐scale droughts mainly concentrated border areas Hebei, Shandong, Henan; (c) total 13 event pairs successfully matched NCP, including 7 “one‐to‐one,” “one‐to‐many,” 1 pair “many‐to‐one,” “many‐to‐many.” responses elucidated perspective, which propose new approach for establishing propagation model, predicting future conditions, improving ecological environment quality, also be applied investigation other types.

Language: Английский

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Probabilistic assessment of drought impacts on wheat yield in south-eastern Australia

Agricultural Water Management, Journal Year: 2023, Volume and Issue: 284, P. 108359 - 108359

Published: May 16, 2023

A risk-based approach is more meaningful to quantify the effects of drought on crop yield given randomness nature past events, compared deterministic approach. However, majority these probabilistic studies are conducted at national or global scale assess loss probability under conditions. There still a lack research combining droughts and yields in way local scale. Moreover, it unclear how threshold triggering conditional will vary dryland cropping regions. Here, we used wheat data from 66 shires New South Wales (NSW) belt meteorological 986 weather stations. copula-based method was developed explore various We investigated using constructed copula function. found that SPEI-6 October optimal index represent detrended variation as this period covered main growth stages winter study region. Our results show severity increased, also increased. Yield varied among shires, mainly due climate conditions each The subregion 1 (the northwest) highest, followed by 2 southwest) 3 eastern), indicating sensitive drought. findings could provide important direction benchmarks for stakeholders evaluating agricultural impact drought, especially those prone areas. expect methodological framework here can be extended other areas helpful information growers, risk management policy makers insurance evaluators.

Language: Английский

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Meteorological drought monitoring in Kızılırmak Basin, Türkiye

Environmental Earth Sciences, Journal Year: 2024, Volume and Issue: 83(9)

Published: April 18, 2024

Abstract Drought, a major phenomenon impacting water resources, viability, sustainability, and the economy, has been one of most important hydrological concerns. In literature, it classified into four groups that are meteorological, agricultural, hydrological, socio-economic. Meteorological drought expresses precipitation deficits when they significantly below those recorded normal times. this study, using Standard Precipitation Index (SPI) mean monthly records 17 stations which have obtained from General Directorate Meteorology Türkiye, monitoring analysis conducted for Kızılırmak Basin, is second largest basin country source many provinces allowing time scales 1, 3, 6, 9, 12, 24 months considering cases “dry” (SPI ≤ − 1.5) “wet” ≥ 1.5). To detect possible trends in two categories Severe Extreme SED 1.5), Wet, SEW all scales, developed form innovative trend (ITA) performed by adding vertical lines. addition, traditional Mann–Kendall test applied to SPI series. The findings indicate dry occurrences tend outnumber wet across various scales. Analysis reveals significant majority results exhibit consistent (89%), with notable increase category (62.74%) decrease (60.78%). demonstrates 67% observed show decrease, while 33% an

Language: Английский

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Urbanization impacts on evapotranspiration change across seven typical urban agglomerations in China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 950, P. 175399 - 175399

Published: Aug. 8, 2024

Language: Английский

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Propagation threshold from meteorological to agricultural drought and its potential influence factors

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132920 - 132920

Published: Feb. 1, 2025

Language: Английский

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