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Flinders Scientists Co-Developing Tech to Track Climate Change

Since the 1950s, weather extremes have become more frequent and intensive. However, international hydrology experts are using new technology to map land areas subject to hotter, dryer conditions under climate change. Flinders University experts have worked with Chinese and other Australian researchers on three studies to assess the effects of droughts on heatwaves, vegetation health and soil salinity.

The first study was led by former Flinders University PhD Dr Ajaio Chen; it employs advanced computer modelling to divide a world map into red and blue regions to reflect areas worst hit by global warming compared to drought-induced local soil moisture deficit.

The two other studies were led by China Agriculture University scientists, who are working to improve the use of hyperspectral remote sensing technology to monitor salinity of irrigated agricultural soils, and on drought impacts on vegetation health on a large scale.

Flinders University Associate Professor Huade Guan, a chief investigator from Australia’s National Centre for Groundwater Research and Training stated that these two studies provide methods for assessing the large-scale effects of global warming and increasing rainfall variability on hot extremes, aridification, soil degradation and food security in order to plan for future resilience of our environment and agricultural systems.

The first study found that while some regions become more frequently hit by hot extreme occurrences due to global warming (in red), others are more affected by the strong year-on-year variability in root zone soil moisture (in blue, see map below).

Areas more likely to suffer from global warming induced heat extremes are in dry regions (such as the Sahara), mountain ranges (e.g., the Andes in South America, the Rockies in North America), and plateaus (e.g., the Brazilian Plateau and the Mongolian Plateau), where interannual variability of root zone moisture is generally smaller due to water deficiency, steep topography, and/or low temperature. The clearance of vegetation as well as ocean-atmosphere phenomena also influenced the number of hot days.

Meanwhile, directed use of large-scale soil salinity monitoring could help mitigate the deteriorating effects of hotter drier conditions, says co-author Associate Professor Guan.

The second study developed a new ‘soil spectral reflectance exponential model’ to improve the use of soil spectrometry for a quick assessment of soil salinity in large scale. The technology can be used to monitor soil salinity on flood plains and on irrigation crop fields.

Soil salinity affects about 23% of cultivated land, especially in arid and semi-arid irrigated agricultural areas and is one of the main factors restricting sustainable development of agriculture.

The first study, Spatially differentiated effects of local moisture deficit and increased global temperature on hot extreme occurrences (2022) by Ajiao Chen, Huade Guan and Okke Batelaan, has been published in the Journal of Hydrology, Elsevier.

The second study, An improved exponential model considering a spectrally effective moisture threshold for proximal hyperspectral reflectance simulation and soil salinity estimation (2022), by Xi Huang, Tiecheng Bai, Huade Guan, Xiayong Wei, Yali Wang and Xiaomin Mao has been published in Remote Sensing.

Also see Three-dimensional linkage between meteorological drought and vegetation drought across China (2023) by Zhen Weng, Jun Niu, Huade Guan and Shaozhong Kang, has been published in Science of the Total Environment.


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