Trend Analysis and Variability of Air Temperature and Rainfall in Regional River Basins

Ekwueme, Benjamin Nnamdi; Agunwamba, J. C.

doi:10.28991/cej-2021-03091692

Cited by 57 publications

(8 citation statements)

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“…For example, Ma (2021) studied the recent changes in temperature and precipitation of the summer and autumn seasons over Fujian Province, China and revealed an upward trend in both temperature and precipitation over a period of forty-eight years. Ekwueme & Agunwamba (2021) in examining trend analysis and variability of air temperature and rainfall in the regional river basins of southeastern Nigeria for the period 1922 to 2008 observed negative trend for rainfall in the study areas except for Owerri and Awka. For air temperature, they reported positive trend for all the study sites.…”

Section: Introductionmentioning

confidence: 87%

Spatiotemporal Trends And Variability Analysis Of Rainfall And Temperature Over Benin Metropolitan Region, Edo State, Nigeria

Balogun

Ekpenkhio

Ebena

2023

GES

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Rainfall and temperature are the two major climatic variables affecting humans and the environment. Hence, it is essential to study rainfall and temperature variability over urban areas. This study focused on analyzing the spatiotemporal trends and variability of rainfall and temperature over Benin metropolitan region, Nigeria. Time series analysis was used to determine temporal trends in rainfall as well as minimum and maximum atmospheric temperatures over a study period of 30 years (1990 to 2019). Analysis of variance was used to understand spatiotemporal variations of climatic elements among the spatial units (urban core, intermediate and peripheral areas). Land surface temperature (LST) and land use/land cover (LULC) classes of the study area were analyzed from Landsat TM Imagery of 2020. Results revealed a decreasing trend for rainfall and increasing trend for minimum and maximum atmospheric temperatures in all the spatial units. Rainfall distribution and temperature among the spatial units were statistically insignificant; however, significant temporal decadal variations were noticed for minimum and maximum air temperatures. This investigation provided valuable information for assessing changes in rainfall and temperature and concluded that the study area is becoming warmer; an indication of global warming and climate change.

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Section: Introductionmentioning

confidence: 87%

Spatiotemporal Trends And Variability Analysis Of Rainfall And Temperature Over Benin Metropolitan Region, Edo State, Nigeria

Balogun

Ekpenkhio

Ebena

2023

GES

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“…The basin covers a wide climatic zone from humid subtropical to arid and has a relatively longrunning and dense meteorological and hydrological observation network. Climate variability is one of the severe environmental changes of the twenty first century (Mall RK, et al, 2006;Ekwueme BN, et al, 2021). Thus, parts of the water cycle are probably accelerating due to climate change because rising global temperatures accelerate global evaporation.…”

Section: Climate and Hydrologymentioning

confidence: 99%

Demystifying Heavy Metals and Physicochemical Characteristics of Groundwater in a Volcano-Tectonic Region of Middle Awash, Ethiopia, for Multipurpose Use

Abebe,

Alemayehu,

Birhanu

et al. 2024

Preprint

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This study investigates the concentrations of physicochemical and heavy metal contaminants in the groundwater of the Middle Awash Basin, Ethiopia, to inform targeted water management strategies. A total of 32 groundwater samples were collected from 16 stations via piezometers and boreholes at the end of both the dry (June 2021) and wet (October 2021) seasons. Utilizing Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Atomic Absorption Spectroscopy (AAS), and in situ metering, 22 physicochemical and 24 heavy metal parameters were analyzed. The data revealed significant levels of contamination; notably, sample GW11 had extraordinarily high concentrations of total dissolved solids (10,826 mg/L), strontium (908 µg/L), molybdenum (802.4 µg/L), zinc (6060 µg/L), and electrical conductivity (15,645 µS/cm), while GW12 exhibited elevated levels of aluminum (2615 µg/L), zinc (4446 µg/L), and arsenic (117.2 µg/L). Contaminants such as arsenic, vanadium, gallium, lithium, rubidium, chromium, manganese, copper, and zinc were found enriched in groundwater near Lake Beseka, influenced by agricultural runoff from sugarcane plantations and agro-industry activities. Over half of the groundwater sources were unsuitable for drinking, posing significant health risks to local communities that rely heavily on these sources due to limited access to clean surface water. The findings emphasize the urgent need for comprehensive groundwater management and remediation plans in the Middle Awash region to ensure safe and sustainable water use, particularly addressing the variation in contamination levels influenced by Lake Beseka. These measures are critical to protect public health and support local development in the face of ongoing environmental and anthropogenic pressures.

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“…Spatiotemporal analysis of long-term climatic data can supply considerable information for insights into the extreme variability of weather events within growing seasons (Zhang, et al, 2014;Gummadi et al, 2018;Haghtalab, et al, 2019;. Several authors have conducted trend analysis on historical rainfall data to grant a full perception of the characteristics of agriculture-influencing weather events over distinct geographical zones in the world (Zaytseva et al, 2016;Usman et al, 2018;Batool et al, 2019;Fathi and Ezziyyani, 2019;Ekwueme and Agunwamba, 2021). Factors associated with the variabilities in weather extremes (flooding and/or drought) become more explicit when subjected to time series data analysis.…”

Section: Introductionmentioning

confidence: 99%

Assessing rainfall and extreme weather variability for climate resilient agricultural production systems in Nigeria

Olayide,

Alabi,

Oyedepo

et al. 2024

Preprint

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Nigeria's food production heavily relies on smallholder rainfed agriculture. Unfortunately, this sector is highly vulnerable to the negative impacts of climate change, such as floods and droughts. It is crucial to examine the frequency, intensity, and magnitude of these events and develop effective mitigation and adaptation strategies to ensure the resilience of Nigeria's agricultural system. This study analyses rainfall variability in Nigeria's agroecological zones (AEZs) over the past sixty years. The research evaluates annual, quarterly, and seasonal rainfall patterns and uses the Standardised Precipitation-Evapotranspiration Index (SPEI) to examine drought and flood frequency and intensity. The study's findings reveal that the period from 1981 to 1990 experienced the weakest rainfall patterns across all AEZs, while the best occurred from 1961 to 1970. The humid forest zone consistently received the highest rainfall, although with a declining trend over the decades. Conversely, the Arid/Sahel and Semi-arid zones exhibited the lowest with a slight upward trend in precipitation, while others experienced a reduction. Spatial analysis of drought patterns also reveals that most of the AEZs face high drought risks, with over 65% of the country experiencing a considerable increase in drought in the last three decades. The rainfall pattern was less erratic in zones of lower latitudes than in the higher altitudes. Heavy rainfall events exceeding 10 mm and 20 mm revealed a decreasing trend from the Arid to the Humid Forest zone. Extreme weather events have significant economic consequences. Policymakers and stakeholders must take action to ensure climate resilient and sustainable agricultural production systems.

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Trend Analysis and Variability of Air Temperature and Rainfall in Regional River Basins

Cited by 57 publications

References 0 publications

Spatiotemporal Trends And Variability Analysis Of Rainfall And Temperature Over Benin Metropolitan Region, Edo State, Nigeria

Spatiotemporal Trends And Variability Analysis Of Rainfall And Temperature Over Benin Metropolitan Region, Edo State, Nigeria

Demystifying Heavy Metals and Physicochemical Characteristics of Groundwater in a Volcano-Tectonic Region of Middle Awash, Ethiopia, for Multipurpose Use

Assessing rainfall and extreme weather variability for climate resilient agricultural production systems in Nigeria

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