The dynamics of warming during the last deglaciation in high-elevation regions of Eastern Equatorial Africa

Garelick, S.; Russell, James M.; Richards, Adin; Smith, J.; Kelly, M. A.; Anderson, N.; Jackson, Margaret S.; Doughty, Alice M.; Nakileza, Bob; Ivory, Sarah J.; Dee, Sylvia; Marshall, Charlie

doi:10.1016/j.quascirev.2022.107416

Cited by 14 publications

(21 citation statements)

References 56 publications

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“…The reconstructed overall temperature ranges are, however, consistent with the elevations of the lake archives. The amplitude of temperature change over the last 13 kyr at Garba Guracha is ∼ 6 • C. Similar amplitudes of change have been reconstructed at other high-altitude sites (Lake Mahoma and Lake Rutundu) (Loomis et al, 2017;Garelick et al, 2022), whereas equatorial records at lower elevations yield lower temperature amplitudes (Lake Victoria and Lake Tanganyika) (Tierney et al, 2008;Berke et al, 2012b), and higher temperature amplitudes are also recorded in the northeast African Lake Tana (Loomis et al, 2015). In fact, Garba Guracha has some of the highest-amplitude temperature changes of all of the sites during the Holocene, perhaps because it combines high elevation with a slightly higher latitude than other terrestrial African temperature records.…”

Section: Palaeotemperature Reconstructions For the Garbasupporting

confidence: 72%

“…The remaining ice in the basin might have (i) reduced the temperature of the lake water by inflow of cold meltwater and (ii) buffered the air temperature warming caused by increasing insolation. Indeed, rising temperatures were recorded in other eastern African records as early as 21 ka cal BP (Lake Mahoma) (Garelick et al, 2022) and in Ethiopia as early as 14 ka cal BP (Lake Tana) (Loomis et al, 2015;Tierney et al, 2016).…”

Section: Deglacial Warmingmentioning

confidence: 93%

“…At Lake Turkana, the thermal optimum occurred at 6.4 ka cal BP (Morrissey et al, 2018) or 5 ka cal BP (Berke et al, 2012b). A new temperature reconstruction from Lake Mahoma (Garelick et al, 2022) and a temperature stack including temperature reconstructions from Sacred Lake, Lake Malawi, Lake Tanganyika, (Loomis et al, 2015), Garba Guracha (this study), δ 18 O lake water as reconstructed from the aquatic sugar biomarker fucose (Bittner et al, 2021), Lake Turkana (Berke et al, 2012b;Morrissey et al, 2018), Lake Mahoma (Garelick et al, 2022), Sacred Lake (Loomis et al, 2012), Lake Rutundu (Loomis et al, 2017), Lake Victoria (Berke et al, 2012a), eastern Africa temperature stack (Ivory and Russell, 2018), and insolation 6 • N and June 20 • N (Laskar et al, 2004). Lake Rutundu, and the Congo Basin by Ivory and Russell (2018) showed the highest temperatures between ∼ 7 and ∼ 4.5 ka cal BP.…”

Section: Warm Temperatures During the African Humid Period In Eastern...mentioning

confidence: 98%

“…8). However, the highest temperatures of Lake Victoria occurred at 9 ka cal BP and of Lake Rutundu, Lake Malawi, and Lake Tanganyika at 5 ka cal BP (Berke et al, 2012a;Loomis et al, 2017Loomis et al, , 2015Loomis et al, , 2012Powers et al, 2005;Tierney et al, 2008;Garelick et al, 2022). At Lake Turkana, the thermal optimum occurred at 6.4 ka cal BP (Morrissey et al, 2018) or 5 ka cal BP (Berke et al, 2012b).…”

Section: Warm Temperatures During the African Humid Period In Eastern...mentioning

confidence: 98%

“…De Jonge et al, 2014;Dearing Crampton-Flood et al, 2020;Russell et al, 2018;Weijers et al, 2007a). These calibrations have been successfully used to quantitatively reconstruct continental temperature in marine river outflow and lacustrine sediments and terrestrial archives such as loess sequences and palaeosoils (Loomis et al, 2015(Loomis et al, , 2017Schreuder et al, 2016;Zeng and Yang, 2019;Garelick et al, 2022). Recently, global calibrations have been developed that suit cooler and more seasonal high-latitude lakes better (Martínez-Sosa et al, 2021;Raberg et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia

et al. 2022

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Abstract. Eastern Africa has experienced strong climatic changes since the last deglaciation (15 000 years ago). The driving mechanisms and teleconnections of these spatially complex climate variations are yet not fully understood. Although previous studies on lake systems have enhanced our knowledge of Holocene precipitation variation in eastern Africa, relatively few studies have reconstructed the terrestrial temperature history of eastern Africa from lake archives. Here, we present (i) a new branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration that includes Bale Mountains surface sediments and (ii) a quantitative record of mean annual air temperature (MAT) over the past 12 ka cal BP using brGDGTs in a sediment core collected from Garba Guracha (3950 m a.s.l.) in the Bale Mountains. After adding Bale Mountains surface sediment (n=11) data (Baxter et al., 2019) to the existing East African lake dataset, additional variation in 6-methyl brGDGTs was observed, which necessitated modifying the MBT5ME′ calibration (MBT denotes methylation of branched tetraethers) by adding 6-methyl brGDGT IIIa′ (resulting in the MBT Bale Mountains index, r2=0.93, p<0.05). Comparing the MBT5ME′ and the new MBT Bale Mountains index, our high-altitude Garba Guracha temperature record shows that warming occurred shortly after the Holocene onset when the temperature increased by more than 3.0 ∘C in less than 600 years. The highest temperatures prevailed between 9 and 6 ka cal BP, followed by a temperature decrease until 1.4 ka cal BP. The reconstructed temperature history is linked to supraregional climatic changes associated with insolation forcing and the African Humid Period (AHP), as well as with local anomalies associated with catchment deglaciation and hydrology.

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Section: Palaeotemperature Reconstructions For the Garbasupporting

confidence: 72%

Section: Deglacial Warmingmentioning

confidence: 93%

Section: Warm Temperatures During the African Humid Period In Eastern...mentioning

confidence: 98%

Section: Warm Temperatures During the African Humid Period In Eastern...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia

et al. 2022

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Impact of lead and zinc heavy metal pollution on the growth and phytoremediation potential of Sulla carnosa in Sebkha el Kalbia, Tunisia

Bouzidi,

Krouma

2024

Environ Sci Pollut Res

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Heavy metal pollution from human and natural activities poses significant environmental and health concerns for wildlife and humans, with lead and zinc being particularly threatening. This study focuses on Sebkha El Kalbia in Tunisia, highlighting the challenges faced by local communities in addressing heavy metal pollution. The area is prone to contamination through rivers and streams that transport pollutants from industrial zones and rural areas into the salt pan. The recent establishment of an industrial zone has worsened pollution levels, calling for strict regulatory measures and clean technologies to limit heavy metal pollution and protect human health and the environment. The study assesses the impact of lead and zinc pollution on the growth of Sulla carnosa and its potential for phytoremediation. Soil and plant samples from contaminated areas were analyzed, revealing high levels of heavy metal contamination. The growth parameters of Sulla carnosa, such as plant height, weight, and enzymatic activity, were examined, showing a significant reduction in plant growth when exposed to high metal concentrations. However, Sulla carnosa demonstrated promising phytoremediation potential, with preferential metal accumulation in the roots and improved enzymatic activity. These findings highlight Sulla carnosa as a potential candidate for phytoremediation of heavy metal-contaminated soils.

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A critical assessment of lacustrine branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration models

O'Beirne,

Scott,

Werne

2023

Geochimica et Cosmochimica Acta

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The dynamics of warming during the last deglaciation in high-elevation regions of Eastern Equatorial Africa

Cited by 14 publications

References 56 publications

A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia

A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia

Impact of lead and zinc heavy metal pollution on the growth and phytoremediation potential of Sulla carnosa in Sebkha el Kalbia, Tunisia

A critical assessment of lacustrine branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration models

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