Spatiotemporal characterization of droughts and vegetation response in Northwest Africa from 1981 to 2020

Thi, Nguyễn Quang; Govind, Ajit; Le, Manh-Hung; Linh, Nguyễn Thùy; Anh, Tran Thi Mai; Hai, Nguyen Khac; Ha, Tuyen V.

doi:10.1016/j.ejrs.2023.05.006

Cited by 10 publications

(4 citation statements)

References 39 publications

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“…As confirmed by Thi et al (2023), a robust relationship is evident between NDVI dynamics and climatic parameters (precipitation, temperature) analyzed across successive decades for all study years, showing statistically significant correlations at a notable level of significance.…”

Section: Climatic Factorssupporting

confidence: 61%

Anthropogenic Activities and Climate Variability Impacts on <i>Juniperus thurifera</i> Forest of El Houanet, Morocco

Benhssaine,

Aabdousse,

El Bouchti

et al. 2024

Ecol. Eng. Environ. Technol.

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The current case analysis aims to explore the spatio-temporal evolution of thuriferous juniper (Juniperus thurifera L.) forest formations on the El Houanet plateau within the Biological and Ecological Interest Site (BEIS) of Boutferda in Morocco, focusing on their vulnerability to extinction due to various complex reasons. Our research focused on the period from 1986 to 2022, conducting a meticulous assessment of the spatial changes observed over this chronology. To achieve these objectives, we adopted a diachronic approach, combined with a methodology supported by field examinations. We derived data, including climatic analysis and vegetation indices (NDVI and VCI), from LANDSAT 5 and 8 satellite imagery, enabling a detailed synthesis of the forest's spatiotemporal changes. This analysis was further deepened by considering a range of parameters, including components of the physical environment, climatic variables, as well as anthropogenic influences, with the aim of refining our understanding of the dynamics governing these populations. Findings reveal significant impacts on various strata within this forest, reflecting both regressive and progressive changes that reshaped the landscape's composition and structure.

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Section: Climatic Factorssupporting

confidence: 61%

Anthropogenic Activities and Climate Variability Impacts on <i>Juniperus thurifera</i> Forest of El Houanet, Morocco

Benhssaine,

Aabdousse,

El Bouchti

et al. 2024

Ecol. Eng. Environ. Technol.

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“…For instance, [18] notably highlighted 2021 as part of a sustained dry spell in the country from 2012 to 2021. Similarly, [93] also classified 2020 as a distinctively dry year for the North African region, including Algeria. During these dry years, the median NDVI values consistently fell below 0.25, indicating widespread vegetation stress in the study area.…”

Section: Correlation Of Ndvi Anomaly With Rainfall and Temperature An...mentioning

confidence: 99%

Drought Monitoring Using Moderate Resolution Imaging Spectroradiometer-Derived NDVI Anomalies in Northern Algeria from 2011 to 2022

Benhizia,

Phinzi,

Hateffard

et al. 2024

Environments

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Drought has emerged as a major challenge to global food and water security, and is particularly pronounced for Algeria, which frequently grapples with water shortages. This paper sought to monitor and assess the temporal and spatial distribution of drought severity across northern Algeria (excluding the Sahara) during the growing season from 2011 to 2022, while exploring the relationship between the normalized difference vegetation index (NDVI) anomaly and climate variables (rainfall and temperature). Temporal NDVI data from the Terra moderate resolution imaging spectroradiometer (MODIS) satellite covering the period 2000–2022 and climate data from the European Reanalysis 5th Generation (ERA5) datasets collected during the period 1990–2022 were used. The results showed that a considerable portion of northern Algeria has suffered from droughts of varying degrees of severity during the study period. The years 2022, 2021, 2016, and 2018 were the hardest hit, with 76%, 71%, 66%, and 60% of the area, respectively, experiencing drought conditions. While the relationship between the NDVI anomaly and the climatic factors showed variability across the different years, the steady decrease in vegetation health indicated by the NDVI anomaly corroborates the observed increase in drought intensity during the study period. We conclude that the MODIS-NDVI product offers a cost-efficient approach to monitor drought in data-scarce regions like Algeria, presenting a viable alternative to conventional climate-based drought indices, while serving as an initial step towards formulating drought mitigation plans.

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“…The Mann-Kendall test (Mann 1945;Kendall 1975) is of widespread practice for the investigation of trends (Alam et al 2023). The method has been employed by several researchers (Ashraf et al 2023;Suhana et al 2023;Dufera et al 2023;Thi et al 2023) in the detection of trends. Innovative trend analysis (ITA) which has been developed and assessed by Şen (2012) and Şen (2017) is the method employed by many researchers (Alam et al 2023;Achite et al 2023;Yuce et al 2023;Soylu Pekpostalci et al 2023) for detecting the behavior of different drought types.…”

Section: Introductionmentioning

confidence: 99%

Meteorological drought monitoring in Kızılırmak Basin, Türkiye

Robleh,

Yuce,

Esit

et al. 2024

Environ Earth Sci

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

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Spatiotemporal characterization of droughts and vegetation response in Northwest Africa from 1981 to 2020

Cited by 10 publications

References 39 publications

Anthropogenic Activities and Climate Variability Impacts on <i>Juniperus thurifera</i> Forest of El Houanet, Morocco

Anthropogenic Activities and Climate Variability Impacts on <i>Juniperus thurifera</i> Forest of El Houanet, Morocco

Drought Monitoring Using Moderate Resolution Imaging Spectroradiometer-Derived NDVI Anomalies in Northern Algeria from 2011 to 2022

Meteorological drought monitoring in Kızılırmak Basin, Türkiye

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