Variability of soil moisture proxies and hot days across the climate regimes of Australia

Holmes, Alex; Rüdiger, C.; Mueller, Brigitte; Hirschi, Martin; Tapper, Nigel

doi:10.1002/2017gl073793

Cited by 23 publications

(23 citation statements)

References 52 publications

(108 reference statements)

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“…By contrast, Holmes et al . (2017) and Liu et al . (2019) used the index NHD and were able to identify significant correlations in the southwest, using different datasets.…”

Section: Discussionmentioning

confidence: 97%

“…These indices can be threshold‐based or percentile‐based, and the latter allow for a comparison of different regions. The indices number of hot days (NHD) and number of hot nights (NHN) are percentile‐based (Zhang et al ., 2011) and have also been successfully used in studies of compound dry and heat events (Mueller and Seneviratne, 2012; Holmes et al ., 2017; Russo et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, we used two time periods, 1979–2019 and 1950–2019, to assess changes in the relationship that may have occurred more recently. Although several studies have analysed the relation between hot extremes in the summer months and antecedent drought conditions in Australia and found strong correlations in several regions (Mueller and Seneviratne, 2012; Perkins et al ., 2015; Herold et al ., 2016; Holmes et al ., 2017; Liu et al ., 2019), they considered either only the hottest month (Mueller and Seneviratne, 2012; Liu et al ., 2019) or the aggregated months of summer (Perkins et al ., 2015; Herold et al ., 2016; Holmes et al ., 2017; Loughran et al ., 2017). Here we analyse all individual summer months, that is, December–February, which will allow us a better insight into the relationship between drought and temperature extremes, in terms of spatial and temporal scales.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Summer hot extremes and antecedent drought conditions in Australia

Páscoa

Gouveia

Russo

et al. 2022

Intl Journal of Climatology

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The compound occurrence of extreme weather and/or climate events can cause stronger negative impacts than the individual events, and its frequency is increasing in several regions of the world. In this work, the effect of antecedent drought conditions on hot extremes during the months of December-February in Australia was analysed for two periods (1979-2019 and 1950-2019). The standardized precipitation evapotranspiration index (SPEI) and the indices number of hot days (NHD) and number of hot nights (NHN) were used to assess drought and extreme temperature events. While the link between dry and heat events is more important in the north in February, in December and January it is strong in the east coast. When temporal lags of 1-3 months are considered, there is a strong correlation between SPEI and NHD/NHN for the concurrent month on most of the study area. For the previous 1-3 months, the area and the correlation values decreased, but consistent spatial patterns were obtained for each month, namely negative correlations on the southwest and southeast in December, and the east in February. Tropical areas showed large areas of correlation between SPEI and NHN, including for the previous 3 months, whereas temperate climates showed the smaller area of correlation with NHN, including at the concurrent month. Significant correlations obtained for lead times longer than 1 month, namely with night heat extremes, point to a predictive ability in several regions of Australia.Moreover, the correlation coefficients obtained using the more recent period show similar spatial patterns, but with higher values than for the 1950-2019 period. The results highlight the prospect of an early prediction of hot summer extremes in regions affected by drought in spring.

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“…By contrast, Holmes et al . (2017) and Liu et al . (2019) used the index NHD and were able to identify significant correlations in the southwest, using different datasets.…”

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Summer hot extremes and antecedent drought conditions in Australia

Páscoa

Gouveia

Russo

et al. 2022

Intl Journal of Climatology

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“…Increases in mortality in E . tetrodonta in the Victoria River regions of the Northern Territory have been attributed to drought-related die-back due to localised dry-season water stress 37 and increasing incidence of heat wave events may challenge species which currently occupy the warmest locations across Australia 38 .…”

Section: Discussionmentioning

confidence: 99%

Safety margins and adaptive capacity of vegetation to climate change

Gallagher

Allen

Wright

2019

Sci Rep

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Vegetation is composed of many individual species whose climatic tolerances can be integrated into spatial analyses of climate change risk. Here, we quantify climate change risk to vegetation at a continental scale by calculating the safety margins for warming and drying ( i . e ., tolerance to projected change in temperature and precipitation respectively) across plants sharing 100 km × 100 km grid cells (locations). These safety margins measure how much warmer, or drier, a location could become before its ‘typical’ species exceeds its observed climatic limit. We also analyse the potential adaptive capacity of vegetation to temperature and precipitation change ( i . e ., likelihood of in situ persistence) using median precipitation and temperature breadth across all species in each location. 47% of vegetation across Australia is potentially at risk from increases in mean annual temperature (MAT) by 2070, with tropical regions most vulnerable. Vegetation at high risk from climate change often also exhibited low adaptive capacity. By contrast, 2% of the continent is at risk from reductions in annual precipitation by 2070. Risk from precipitation change was isolated to the southwest of Western Australia where both the safety margin for drier conditions in the typical species is low, and substantial reductions in MAP are projected.

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“…Hydroclimatic extremes such as heat waves and droughts are a common occurrence in arid and semiarid areas of the world such as Australia [1]. These extreme events generally have significant impacts on humans, the environment, and the economy [2].…”

Section: Introductionmentioning

confidence: 99%

Can We Use Satellite-Based FAPAR to Detect Drought?

Peng

Müller

Blessing

et al. 2019

Sensors

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Drought in Australia has widespread impacts on agriculture and ecosystems. Satellite-based Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) has great potential to monitor and assess drought impacts on vegetation greenness and health. Various FAPAR products based on satellite observations have been generated and made available to the public. However, differences remain among these datasets due to different retrieval methodologies and assumptions. The Quality Assurance for Essential Climate Variables (QA4ECV) project recently developed a quality assurance framework to provide understandable and traceable quality information for Essential Climate Variables (ECVs). The QA4ECV FAPAR is one of these ECVs. The aim of this study is to investigate the capability of QA4ECV FAPAR for drought monitoring in Australia. Through spatial and temporal comparison and correlation analysis with widely used Moderate Resolution Imaging Spectroradiometer (MODIS), Satellite Pour l’Observation de la Terre (SPOT)/PROBA-V FAPAR generated by Copernicus Global Land Service (CGLS), and the Standardized Precipitation Evapotranspiration Index (SPEI) drought index, as well as the European Space Agency’s Climate Change Initiative (ESA CCI) soil moisture, the study shows that the QA4ECV FAPAR can support agricultural drought monitoring and assessment in Australia. The traceable and reliable uncertainties associated with the QA4ECV FAPAR provide valuable information for applications that use the QA4ECV FAPAR dataset in the future.

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Variability of soil moisture proxies and hot days across the climate regimes of Australia

Cited by 23 publications

References 52 publications

Summer hot extremes and antecedent drought conditions in Australia

Summer hot extremes and antecedent drought conditions in Australia

Safety margins and adaptive capacity of vegetation to climate change

Can We Use Satellite-Based FAPAR to Detect Drought?

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