Glycerol dialkyl glycerol tetraether signatures in tropical mesotidal estuary sediments of Qua Iboe River, Gulf of Guinea

Umoh, Unyime U.; Li, Li; Wang, Junjian; Kauluma, Ndamononghenda; Asuquo, Francis E.; Akpan, E. R.

doi:10.1016/j.orggeochem.2022.104461

Cited by 4 publications

(1 citation statement)

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“…Furthermore, the ring index of OH-GDGTs (RI-OH) is suitable for the convenient reconstruction of the tropical warm SST, especially for the tropical estuarine and coastal areas [22]. An error may be present in the estimation of the SST in which GDGTs are derived from both terrestrial archaea and marine methanogens [23]. Fortunately, the GDGTs-related indexes can modify this kind of error.…”

Section: Introductionmentioning

confidence: 99%

Holocene Paleoclimate Records in Equatorial West Africa: Insights Based on the Characterization of Glycerol Dialkyl Glycerol Tetraethers

Yang,

Mao,

Cao

et al. 2024

Water

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One gravity core retrieved from the Niger Delta was used to explore the origin of deposited organic matter (OM) and the paleo-climatic and environmental conditions over the Holocene in equatorial West Africa. The geochemical properties of sediments including glycerol dialkyl glycerol tetraethers (GDGTs) and elemental (%OC, %N, C/N) and isotopic (δ13Corg, δ15N) signatures were determined. The determination constrained the age of the column and revealed that the sediment OM was mainly derived from a marine source. The isoprenoid (iso)GDGTs were the dominant GDGTs, with a small amount of branched (br)GDGTs, which led to a low-branched and isoprenoid tetraether index (BIT, 0.02–0.21) and represented a low terrestrial input. Most isoGDGTs and OH-GDGTs were produced in situ by Marine Group I (MG-I) Thaumarchaeota, while the brGDGTs were mainly transported from land. A two-endmember model quantified the contribution of terrestrial OM, as 0.9–19.9% by BIT and 1.1–32.6% by δ13C. Accordingly, the millennium-scale sea surface temperatures (SSTs) were reconstructed based on the cyclopentane ring distribution (TEX86H) and the ring index of OH-GDGTs (RI-OH). The top core SSTs were lower than the modern mean annual SST due to the growth season and habitat depth of Thaumarchaeota. The reconstructed SSTs clearly revealed the four stages of paleoclimate change, in particular, the drought episode of 8.2 kyr and the following humid period. The above research has enhanced our understanding of the paleoclimate change in river outflow during the Holocene at the millennium scale.

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Section: Introductionmentioning

confidence: 99%