Article
Environmental Sciences
Zhen Weng, Jun Niu, Huade Guan, Shaozhong Kang
Summary: This study employs a 3-dimensional clustering identification method to capture drought events and their characteristics in vegetated regions of China during 1982-2018. The study reveals that drought events are concentrated in spring and summer, and different types of drought events have different impacts on vegetation drought. The impacts of moisture deficit and high temperature on vegetation also show significant seasonal difference and contradictory trends.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Tianliang Jiang, Xiaoling Su, Vijay P. Singh, Gengxi Zhang
Summary: The study introduced the concept of ecological drought and utilized the SEWDI to monitor ecological drought in Northwestern China. Findings revealed that ecological drought events in the 21st century were more severe in terms of affected area, duration, frequency, and severity, with a westward migration. Thermal conditions played a dominant role in influencing vegetation health during ecological drought events.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agronomy
Zhibin Liu, Junyue Zhu, Jianyang Xia, Kun Huang
Summary: This study evaluates the drought resistance and resilience of global vegetation productivity using long-term satellite observations, and finds a significant decline in drought resistance but no significant change in resilience. Temperature and soil moisture are identified as the main factors affecting drought resistance. Earth system models underestimate the historical drought resistance and resilience, and project further decline in the future.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Environmental Sciences
Jeongeun Won, Sangdan Kim
Summary: This study proposes an Ecological Drought Condition Index-Vegetation (EDCI-veg) to evaluate and monitor the impact of meteorological drought on vegetation. By constructing a copula-based bivariate joint probability distribution, EDCI-veg can quantitatively estimate the effect of drought on vegetation, determine the timing and severity of vegetation drought. The applicability of EDCI-veg is demonstrated by comparing past meteorological drought events with corresponding vegetation conditions.
Article
Environmental Sciences
Alexandra Nauditt, Kerstin Stahl, Erasmo Rodriguez, Christian Birkel, Rosa Maria Formiga-Johnsson, Marko Kallio, Lars Ribbe, Oscar M. Baez-Villanueva, Joschka Thurner, Hamish Hann
Summary: Droughts are causing severe damages to tropical countries worldwide. Little knowledge about tropical drought characteristics exists, calling for reliable methodologies to evaluate drought risk in data scarce tropical regions. This study combined drought hazard and vulnerability related data to assess drought risk in four rural tropical study regions, providing relevant information for regional planners and water managers dealing with future drought disasters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wenhui Zhao, Jianjun Wu, Qiu Shen, Jianhua Yang, Xinyi Han
Summary: This study compares the responses of different vegetation indices to drought and finds that solar-induced chlorophyll fluorescence (SIF) is more sensitive to drought and has excellent drought monitoring capabilities.
Article
Engineering, Civil
Sifang Feng, Zengchao Hao, Xinying Wu, Xuan Zhang, Fanghua Hao
Summary: This study evaluated the impact of different drought indicators on the variability of compound dry and hot events (CDHEs) in global maize-producing areas. Results showed that CDHEs defined by SPEI & STI had a higher increase in frequency and spatial extent compared to those defined by SPI & STI and scPDSI & STI, with consistent patterns across different thresholds and base periods. The findings could contribute to understanding variations in compound events and provide insights for agricultural management under global warming.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Shakirudeen Lawal, Bruce Hewitson, Temitope S. Egbebiyi, Ayodeji Adesuyi
Summary: The study evaluated the suitability of vegetation indices to monitor the response of Africa's terrestrial ecoregions to drought, using different remotely sensed derived drought indices and calculating their correlations with vegetation indices spatially, temporally, and seasonally. The results showed variations in the response of vegetation indices and derived drought indices across different timescales and regions in Africa.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biodiversity Conservation
Amin Fathi-Taperasht, Hossein Shafizadeh-Moghadam, Masoud Minaei, Tingting Xu
Summary: Drought duration and severity affect the recovery period of different land use and land cover types in Iran, with shrublands and croplands experiencing longer droughts and recovery times compared to forests. There is a direct relationship between drought severity and recovery period, however, the correlation between drought duration and recovery time varies geographically.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Israel R. Orimoloye, Olusola O. Ololade, Johanes A. Belle
Summary: The study used Terra MOD13Q1 satellite data to assess drought events in the Free State Province, South Africa from 2001 to 2019. MODIS products and climate data were obtained from AppEEARS and NASA databases for analysis, with R programming used to process the data. The study identified water-stressed years, seasonal drought patterns, and compared drought events using the Vegetation Condition Index, highlighting the severity of summer droughts compared to winter droughts in the region. The results can be used for drought monitoring, decision-making, and disaster preparedness.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Geography, Physical
Thuong V. V. Tran, David Bruce, Cho-Ying Huang, Duy X. X. Tran, Soe W. W. Myint, Duy B. B. Nguyen
Summary: Using a multivariate drought index that incorporates important environmental variables and is suitable for a specific geographical region is essential to fully understanding the pattern and impacts of drought severity. This study applied feature scaling algorithms to MODIS time-series imagery to develop an integrated Multivariate Drought Index (iMDI).
GISCIENCE & REMOTE SENSING
(2023)
Article
Biodiversity Conservation
Shaobo Zhong, Ziheng Sun, Liping Di
Summary: This study extensively investigates vegetation drought response in the CONUS area using remote sensing technology, and finds good consistencies between remote sensing products and meteorological data. Time lags significantly affect the correlation between SPEI and VCI, and there are variations in vegetation responses to meteorological indices among different vegetation types and aridity levels.
ECOLOGICAL INDICATORS
(2021)
Article
Computer Science, Interdisciplinary Applications
Yujia Cheng, Ke Zhang, Lijun Chao, Wuzhi Shi, Jin Feng, Yunping Li
Summary: This study proposes a new comprehensive remote sensing drought index (CRSDI) based on the nested copulas of remotely sensed precipitation, vegetation index, and land surface temperature that represent water availability, vegetation health, and disturbance impact, respectively, for monitoring meteorological and agroecological droughts. The Qinghai-Tibet Plateau (QTP) is chosen as a case study to test the CRSDI and investigate drought changes and their impacts on vegetation. The results show that CRSDI can effectively monitor the propagation processes and characteristics of meteorological and agroecological droughts. Drought conditions on the QTP are overall relieved from 2000 to 2020, while these changes show an apparent spatial variability, with a general drying (wetting) trend in the north (south). Moreover, vegetation response to drought is different among different vegetation types, with shrubland having a stronger response, followed by cropland, grassland, and forestland. Clearly, CRSDI is valuable for large-scale drought monitoring and assessment.
ENVIRONMENTAL MODELLING & SOFTWARE
(2023)
Article
Environmental Sciences
Steye L. Verhoeve, Tamara Keijzer, Rehema Kaitila, Juma Wickama, Geert Sterk
Summary: The study found that rainfall did not significantly change, but mean monthly temperatures increased, leading to more frequent and prolonged droughts. Vegetation cover declined by 9.7% between 1981 and 2020, with good resilience observed for vegetation, recovering quickly after dry periods. However, climate change predictions suggest more droughts which could further impact vegetation cover in the future.
Article
Engineering, Civil
Yaping Wang, Shuai Wang, Wenwu Zhao, Yanxu Liu
Summary: Under global warming, droughts have become more severe and frequent. This study focuses on the Yellow River basin in China, which is mainly located in arid and semi-arid regions and suffers from severe droughts. The study examines the temporal and spatial patterns of droughts in the area and explores the relative effects of water supply (precipitation) and demand (evapotranspiration) on drought occurrence. The study finds that precipitation is the dominant driver of drought occurrence in most of the basin, while evapotranspiration has a greater contribution to drought variations in some areas. The study also highlights the relationship between droughts and ocean signals such as ENSO and NAO.
JOURNAL OF HYDROLOGY
(2022)
