Hydro-climate changes over southwestern Arabia and the Horn of Africa during the last glacial–interglacial transition: A pollen record from the Gulf of Aden

Fersi, Wiem; Lézine, Anne-Marie; Bassinot, Franck

doi:10.1016/j.revpalbo.2016.04.002

Cited by 10 publications

(7 citation statements)

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“…This paper used various methods to detect trends in the precipitation and temperature. The methods are either Parametric or non-parametric which are essential to detect the trends of hydrometeorological observations [27]. Following, are the lists of trend detection non-parametric tests used in this paper, see Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Gedefaw

Yan

Wang

et al. 2019

Water

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The changes in climatic variables in Ethiopia are not entirely understood. This paper investigated the recent trends of precipitation and temperature on two eco-regions of Ethiopia. This study used the observed historical meteorological data from 1980 to 2016 to analyze the trends. Trend detection was done by using the non-parametric Mann-Kendall (MK), Sen's slope estimator test, and Innovative Trend Analysis Method (ITAM). The results showed that a significant increasing trend was observed in the Gondar, Bahir Dar, Gewane, Dembi-Dolo, and Negele stations. However, a slightly decreasing trend was observed in the Sekoru, Degahabur, and Maichew stations regarding precipitation trends. As far as the trend of temperature was concerned, an increasing trend was detected in the Gondar, Bahir Dar, Gewane, Degahabur, Negele, Dembi-Dolo, and Maichew stations. However, the temperature trend in Sekoru station showed a sharp decreasing trend. The effects of precipitation and temperature changes on water resources are significant after 1998. The consistency in the precipitation and temperature trends over the two eco-regions confirms the robustness of the changes. The findings of this study will serve as a reference for climate researchers, policy and decision makers.

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Section: Methodsmentioning

confidence: 99%

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Gedefaw

Yan

Wang

et al. 2019

Water

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“…Long-term trends in the observed and adjusted time series data were detected using the MK test, with linear changes in the data represented by Kendall-Theil Robust Lines. This non-parametric MK test is best suited for evaluating changes in hydrologic regimes [24]. Trend analysis was used to investigate whether the trend was upward, downward, or there was no trend in the data value points.…”

Section: Methodsmentioning

confidence: 99%

Trend Analysis of Climatic and Hydrological Variables in the Awash River Basin, Ethiopia

Gedefaw

Wang

Yan

et al. 2018

Water

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The Awash river basin has been the most extensively developed and used river basin in Ethiopia since modern agriculture was introduced. This paper investigated the annual precipitation, temperature, and river discharge variability using the innovative trend analysis method (ITAM), Mann–Kendall (MK) test, and Sen’s slope estimator test. The results showed that the trend of annual precipitation was significantly increasing in Fitche (Z = 0.82) and Gewane (Z = 0.80), whereas the trend in Bui (Z = 69) was slightly decreasing and the trend in Sekoru (Z = 0.45) was sharply decreasing. As far as temperature trends were concerned, a statistically significant increasing trend was observed in Fitche (Z = 3.77), Bui (Z = 4.84), and Gewane (Z = 5.59). However, the trend in Sekoru (Z = 1.37) was decreasing with statistical significance. The discharge in the study basin showed a decreasing trend during the study period. Generally, the increasing and decreasing levels of precipitation, temperature, and discharge across the stations in this study indicate the change in trends. The results of this study could help researchers, policymakers, and water resources managers to understand the variability of precipitation, temperature, and river discharge over the study basin.

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“…7 cal ka BP. Enhanced moisture transport into the region, indicated by reconstructed high lake levels and stronger runoff during the AHP, is well documented in the literature (Tierney et al, 2011b; Foerster et al, 2012; Tierney and deMenocal, 2013; Morrissey and Scholz, 2014; Fersi et al, 2016; Liu et al, 2017; Wagner et al, 2018; Beck et al, 2019; Jaeschke et al, 2020; Mologni et al, 2020).…”

Section: Discussionmentioning

confidence: 67%

The Holocene lake-evaporation history of the afro-alpine Lake Garba Guracha in the Bale Mountains, Ethiopia, based on δ¹⁸O records of sugar biomarker and diatoms

et al. 2021

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In eastern Africa, there are few long, high-quality records of environmental change at high altitudes, inhibiting a broader understanding of regional climate change. We investigated a Holocene lacustrine sediment archive from Lake Garba Guracha, Bale Mountains, Ethiopia, (3,950 m asl), and reconstructed high-altitude lake evaporation history using δ18O records derived from the analysis of compound-specific sugar biomarkers and diatoms. The δ18Odiatom and δ18Ofuc records are clearly correlated and reveal similar ranges (7.9‰ and 7.1‰, respectively). The lowest δ18O values occurred between 10–7 cal ka BP and were followed by a continuous shift towards more positive δ18O values. Due to the aquatic origin of the sugar biomarker and similar trends of δ18Odiatom, we suggest that our lacustrine δ18Ofuc record reflects δ18Olake water. Therefore, without completely excluding the influence of the ‘amount-effect’ and the ‘source-effect’, we interpret our record to reflect primarily the precipitation-to-evaporation ratio (P/E). We conclude that precipitation increased at the beginning of the Holocene, leading to an overflowing lake between ca. 10 and ca. 8 cal ka BP, indicated by low δ18Olake water values, which are interpreted as reduced evaporative enrichment. This is followed by a continuous trend towards drier conditions, indicating at least a seasonally closed lake system.

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Hydro-climate changes over southwestern Arabia and the Horn of Africa during the last glacial–interglacial transition: A pollen record from the Gulf of Aden

Cited by 10 publications

References 50 publications

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Trend Analysis of Climatic and Hydrological Variables in the Awash River Basin, Ethiopia

The Holocene lake-evaporation history of the afro-alpine Lake Garba Guracha in the Bale Mountains, Ethiopia, based on δ¹⁸O records of sugar biomarker and diatoms

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Hydro-climate changes over southwestern Arabia and the Horn of Africa during the last glacial–interglacial transition: A pollen record from the Gulf of Aden

Cited by 10 publications

References 50 publications

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Analysis of the Recent Trends of Two Climate Parameters over Two Eco-Regions of Ethiopia

Trend Analysis of Climatic and Hydrological Variables in the Awash River Basin, Ethiopia

The Holocene lake-evaporation history of the afro-alpine Lake Garba Guracha in the Bale Mountains, Ethiopia, based on δ18O records of sugar biomarker and diatoms

Contact Info

Product

Resources

About

The Holocene lake-evaporation history of the afro-alpine Lake Garba Guracha in the Bale Mountains, Ethiopia, based on δ¹⁸O records of sugar biomarker and diatoms