Rainfall trends and spatiotemporal patterns of meteorological drought in Menna watershed, northwestern Ethiopia

Heliyon, Год журнала: 2024, Номер 10(6), С. e27919 - e27919

Опубликована: Март 1, 2024

Understanding the spatiotemporal patterns of drought is crucial for planning, disaster preparedness, vulnerability assessment, impact evaluation, and policy formulation to mitigate drought-induced effects. The purpose this study was assess rainfall trends meteorological using geospatial techniques in Menna watershed. Climate Hazards Group InfraRed Precipitation with Stations (CHIRPS) rainfall, station-based observed were datasets used. used confirm accuracy CHIRPS data. Mann-Kendall (MK) test Sen's slope estimator utilized ascertain extent change. To characterize droughts, percent normal (PN), standardized anomaly index (SAI), precipitation (SPI) computed during crop growing seasons (2000-2022). validation result confirmed a strong agreement between data (R2 = 0.88). Based on MK test, an increasing trend has been annual (3.7 mm/year)

Язык: Английский

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The spatio-temporal trend of climate and characterization of drought in Borana Zone, Ethiopia

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Фев. 8, 2025

This research assessed the Borana Zone's climate trends and drought characteristics from 1991 to 2050. Using Innovative Trend Analysis (ITA), we quantified changes. The standard Precipitation Evaporation index (SPEI) self calibrated Palmer's Droguht Severity Index (scPDSI) were selected compute drought's magnitude. significantly decreased 2020, with a variation 2021 Drought indices generally showed decreasing trend. short-term (SPEI3) in Mid-Moist (MM) category experienced greatest decline, slope of − 0.055/year during reference period. Under RCP4.5 scenarios, SPEI3 for Extremely-Most (EM) class steepest decline at 1.827/year. For RCP8.5, MM categories displayed significant reductions, annual slopes 0.073, 0.021, 0.14 SPEI3, SPEI12, scPDSI, respectively. moisture intensity also diminishing trend, scPDSI projected decrease by 40.47% 20.77% under two emission scenarios. During period, Near Normal (NN) frequency varied 71.39% 82.81%, but is expected 12% 8% adverse impacts can be mitigated building capacity drought-vulnerable community.

Язык: Английский

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Causes for the Changes in Reference Crop Evapotranspiration Over Ethiopia During 1980–2021

International Journal of Climatology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 24, 2025

ABSTRACT Considering the great significance of reference crop evapotranspiration (ET o ) for various sectors (i.e., biodiversity, agriculture, forestry development and water resources), this study comprehensively investigated its changes during 1980–2021 based on Food Agriculture Organisation‐56 Penman‐Monteith equation five popular meteorological datasets. As whole Ethiopia, both annual monthly ET significantly increased, but increasing trends varied among months with larger values January–April September–December. Spatially, exhibited evident differences, characterised by increases over more than 88% areas, especially September–December, an area percentage exceeding 78%. Attribution analyses a joint‐solution method multiple sensitivity experiments suggested that were determined increased mean temperature ( T ). However, dominant factors spatially. On scale, net radiation R n , accounting 21.2% 78.8% respectively, mainly in northwestern, southwestern southeastern Ethiopia remaining regions. Although different spatial distributions existed months, factor always had most extensive (> 47%), followed 18%) January–April, June, August, October November, wind speed at 2 m 19%) May, July, September December. This complete analysis related physical mechanisms can partly fill research gap Ethiopia. Moreover, provides essential information better understanding climate change, protecting biodiversity sustaining regional (e.g., agriculture resources).

Язык: Английский

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Mapping the spatial and temporal variation of agricultural and meteorological drought using geospatial techniques, Ethiopia

ENVIRONMENTAL SYSTEMS RESEARCH, Год журнала: 2021, Номер 10(1)

Опубликована: Фев. 9, 2021

Abstract Background Geographic Information System (GIS) and Remote Sensing play an important role for near real time monitoring of drought condition over large areas. The aim this study was to assess spatial temporal variation agricultural meteorological using image eMODIS NDVI based vegetation index (VCI) standard precipitation (SPI) from the year 2000 2016. To validate strength indices correlation analysis made between VCI crop yield anomaly as well standardized anomaly. Results results revealed that 2009 2015 years while 2001 2007 were wet years. There also a good rainfall (r = 0.71), (0.72), SPI (0.74). Frequency metrological compiled by historical intensity map. result shows there complex local scale in frequency events period. no without many parts area. Combined risk map showed 8%, 56% 35% area vulnerable very severe, severe moderate respectively. Conclusions In conclusion, is highly drought. Thus besides mapping areas, integrating socio-economic data better understand other factors recommended.

Язык: Английский

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Impact of Climate Change on Hydrometeorology and Droughts in the Bilate Watershed, Ethiopia

Water, Год журнала: 2022, Номер 14(5), С. 729 - 729

Опубликована: Фев. 24, 2022

This study aims to assess the potential impacts of climate change on hydrometeorological variables and drought characteristics in Ethiopian Bilate watershed. Climate projections under two Representative Concentration Pathways (RCP4.5 RCP8.5) were obtained from Coordinated Regional Downscaling Experiment (CORDEX) Africa for near future (2021–2050) far (2071–2100) periods. The Soil Water Assessment Tool (SWAT) model was applied changes watershed hydrology with CORDEX-Africa data. Standardized Precipitation Index (SPI), Streamflow Drought (SDI), Reconnaissance (RDI) calculated identify meteorological, hydrological, agricultural droughts, respectively. Due a significant rise temperature, evapotranspiration will increase by up 16.8% end 21st century. Under RCP8.5 scenario, annual average rainfall is estimated decrease 38.3% period, inducing reduction streamflow 37.5%. Projections reduced diurnal temperature range might benefit crop growth but suggest elevated heat stress. Probabilities occurrence are expected be doubled increased intensities all three types droughts. These projected exacerbate water scarcity threaten food securities area. findings provide forward-looking quantitative information management authorities decision-makers develop adaptive measures cope changing climate.

Язык: Английский

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Climate Change Impacts on Blue and Green Water of Meki River Sub-Basin

Water Resources Management, Год журнала: 2023, Номер 37(6-7), С. 2835 - 2851

Опубликована: Апрель 15, 2023

Язык: Английский

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Spatiotemporal variability and trend of rainfall and temperature in Sidama Regional State, Ethiopia

Theoretical and Applied Climatology, Год журнала: 2023, Номер 153(1-2), С. 213 - 226

Опубликована: Апрель 27, 2023

Abstract This study aims to investigate spatiotemporal variability, trends, and anomaly in rainfall temperature the Sidama region, Ethiopia. The TerraClimate gridded dataset on a monthly time scale for 30 years (1991–2020) with horizontal resolution of approximately 4 km was used study. Trends annual seasonal were assessed using nonparametric test (Mann-Kendal test) Sen’s slope statistical significance magnitude trends (increase/decrease), respectively. Our findings revealed that rainfall, summer ( Hawado ), spring Badhessa ) have shown an increasing trend most parts except its northwest parts. We found low variability (CV < 13%) over southeastern northwestern region. Rainfall difference both space across Six drought (1999, 2001, 2002, 2003, 2012, 2019) different magnitudes identified Annual average maximum (up 0.4 °C decade −1 minimum 0.25 temperatures significantly standardized mean indicated recent (2011–2020) are getting warmer compared past two decades (1991–2010) due natural anthropogenic activities causing weather extremes results this contradict other studies rift valley part Therefore, we suggest appropriate climate change adaptation strategies so there is high region between seasons.

Язык: Английский

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Monitoring spatio-temporal drought dynamics using multiple indices in the dry land of the upper Tekeze Basin, Ethiopia

Environmental Challenges, Год журнала: 2023, Номер 13, С. 100781 - 100781

Опубликована: Окт. 18, 2023

Due to Ethiopia's broad variations in biophysical and climatic variables, an accurate understanding of local-level drought is critical for sustainable risk management. This study aims monitor spatio-temporal dynamics over Tekeze basin from 1981–2021 using Standard Precipitation Index (SPI), Vegetation Condition (VCI), Temperature (TCI), health Index(VHI). The analysis relied on data Moderate Resolution Imaging Spectroradiometer (MODIS) datasets CHIRPS-v2. Google Earth Engine (GEE) was used obtain data, process NDVI trends, calculate indices (DI). Man-Kendall trend Pearson correlation were also employed examine the association DI climate variables. SPI showed that affected by moderate, severe, extreme 1884, 1985, 1987, 1993, 1997, 2015. TCI and, VCI, indicated 2002, 2004, 2009, 2015, 2016, 2017 severe droughts. a decreasing throughout most basin, except pocket areas managed watershed, area closures, irrigation sites. Rainfall July emerged as factor determining NDVI, LST, TCI, VCI August. While strongly correlates with precipitation LST less correlated. Although all DIs are robust assessing agricultural droughts, detected more land under than TCI. underscores importance larger weights correctly classifying drought, particularly drylands where crucial vegetation health.

Язык: Английский

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Analysis of rainfall and temperature variabilities in Sidama regional state, Ethiopia

Heliyon, Год журнала: 2024, Номер 10(7), С. e28184 - e28184

Опубликована: Март 26, 2024

The objective of the study was to examine local-scale fluctuation in precipitation and temperature selected districts Sidama regional state. Specifically, it focuses on three districts—Hawassa Zuriya, Wonsho, Hula—using records obtained from Climate Hazards Group Infrared Precipitation with Station (CHIRPS) database which covers period 1981 2022. Various statistical measures such as mean, standard deviation, well coefficient variation employed detect fluctuation. For trend detection, Mann-Kendall (MK) Sen's slope tests were also employed. Observations revealed that average yearly spatially varied 1331 mm Hula, followed by 1275 1013 at Hawassa Zuriya. Rainfall bimodal 53% rains Kiremt 33% Belg season respectively. Annual rainfall show relatively low variability (<20%) for Hula Wonsho districts, moderate (CV˃20%) Zuriya findings noticeable rising tendencies (p < 0.05) across all agroecosystems over years under consideration highest (0.038 °C/year), (0.031 (0.022 °C/year) respectively.Moreover, both exhibited spatial inter-annual variability. results this necessitate farmers systematic planning implementing location specific crop calendar context fluctuating climatic settings. Policy-makers development practitioners can utilize finding better devise execute plans adapting minimizing effects climate change.

Язык: Английский

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Analysis of rain-shadows in the Ethiopian Mountains using climatological model data

Climate Dynamics, Год журнала: 2021, Номер 56(5-6), С. 1663 - 1679

Опубликована: Янв. 3, 2021

Язык: Английский

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