气候变化领域集成服务门户(CCPortal): Drought Propagation and Recovery Behaviors Across 407 Australian Catchments

CCPortal

DOI	10.1029/2023EF004190
	Drought Propagation and Recovery Behaviors Across 407 Australian Catchments
	Aryal, Santosh K.; Zheng, Hongxing; Zhang, Yongqiang; Faiz, M. A.
发表日期	2024
EISSN	2328-4277
起始页码	12
结束页码	4
卷号	12 期号:4
英文摘要	A reliable understanding of linkages between meteorological, hydrological and agricultural droughts (MD, HD, and AD respectively) is crucial to building resilience and planning for future climate changes. Despite Australia being prone to severe droughts, lagtimes of propagation (and recovery), from meteorological to hydrological and agricultural droughts across its large hydroclimatic regions, are poorly understood. Therefore, we investigate the characteristics of drought propagation and recovery time lags for droughts of four timescales and a combination of drought onset and cessation criteria in 407 unregulated catchments within six major precipitation zones across the country. We find that the propagation and recovery lags depend on climatic conditions, drought criteria and timescales. The median of catchment average propagation times from MD to HD across Australia varied from 0.8 to 1.7 months for 1-month timescales, increasing to 2.2-5.0 months for 12-month timescales. The corresponding recovery lagtimes were 1.3-3.7 and 1.7-7.0 months respectively. Similarly, the median of catchment average propagation times from MD to AD ranged from 0.8 to 1.9 months for 1-month timescales, increasing to 0.6-5.0 months for 12-month. The corresponding recovery lagtimes were 0.7-2.8 and 0.3-8.7 months respectively. For droughts of smaller timescales, propagation and recovery lags are linearly correlated with recovery lagtimes consistently greater than propagation times. However, as the timescale increases, these relationships weaken suggesting effects of other catchment attributes (e.g., groundwater contributions) on lag relationships. The primary focus of the research is to investigate the time delay between the occurrence of the lack of precipitation (meteorological droughts) and its subsequent impact on river flow (hydrological drought) and soil moisture (agricultural drought). Understanding these delays is crucial for drought planning and management. This study uses observed precipitation, river flow, and satellite-based soil moisture data spanning over 40 years across six major precipitation zones within Australia. The delays between drought types (meteorological, hydrological, and agricultural) vary depending on the specific location within Australia. The criteria used to define the onset and end of droughts, as well as the drought duration, also influence the observed delays. The average delay from meteorological to hydrological or agricultural droughts increases with longer timescales. For example, hydrological droughts measured on 1-month timescale have shorter delays (0.8-1.7 months), while 12-month droughts have longer delays (2.2-5 months). Similarly, shorter droughts have shorter recovery times, while longer droughts have longer recovery times. For shorter timescale droughts, there is a clear relationship between the delays with end delays consistently greater than the start delays. However, as droughts become larger and more prolonged, the relationship weakens, suggesting the influence of other catchment attributes. Drought propagation and recovery behaviors for a large sample of catchments under varied climatic zones within Australia are investigated Propagation and recovery lag relationships are well-defined for shorter droughts but are increasingly indefinable for longer droughts Propagation (TP) and recovery lags (TR) depend on drought severity with shorter TP to milder droughts and longer TR to milder droughts
英文关键词	drought propagation; drought recovery; drought lagtime
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001203594900001
来源期刊	EARTHS FUTURE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306722
作者单位	Commonwealth Scientific & Industrial Research Organisation (CSIRO); Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Northeast Agricultural University - China
推荐引用方式 GB/T 7714	Aryal, Santosh K.,Zheng, Hongxing,Zhang, Yongqiang,et al. Drought Propagation and Recovery Behaviors Across 407 Australian Catchments[J],2024,12(4).
APA	Aryal, Santosh K.,Zheng, Hongxing,Zhang, Yongqiang,&Faiz, M. A..(2024).Drought Propagation and Recovery Behaviors Across 407 Australian Catchments.EARTHS FUTURE,12(4).
MLA	Aryal, Santosh K.,et al."Drought Propagation and Recovery Behaviors Across 407 Australian Catchments".EARTHS FUTURE 12.4(2024).