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TEX86

TEX86

TEX86 is an organic paleothermometer based upon the membrane lipids of mesophilic marine Nitrososphaerota (formerly "Thaumarchaeota", "Marine Group 1

TEX86

Glycerol dialkyl glycerol tetraether

in Earth history. Some structural forms of GDGT form the basis for the TEX86 paleothermometer. Isoprenoid GDGTs, now known to be synthesized by many

Glycerol dialkyl glycerol tetraether

Glycerol_dialkyl_glycerol_tetraether

Cretaceous

Third and last period of the Mesozoic Era

Aptian tropical sea surface temperatures (SSTs) were 27–32 °C, based on TEX86 measurements from the equatorial Pacific. During the Aptian, Milankovitch

Cretaceous

Crenarchaeol

Chemical compound

for hundreds of millions of years in the environment. It is part of the TEX86 paleothermometer, a temperature proxy for sea surface temperatures that

Crenarchaeol

Paleocene–Eocene thermal maximum

Global warming about 55 million years ago

subtropical dinoflagellates (Apectodinium spp.}, and a marked increase in TEX86. The latter record is unusual, though, because it suggests a 6 °C (11 °F)

Paleocene–Eocene thermal maximum

Paleocene–Eocene_thermal_maximum

Jessica Tierney

American paleoclimatologist

has worked with geochemical proxies such as marine sediments, mud, and TEX86, to study past climate in East Africa. Her papers have been cited more than

Jessica Tierney

Jessica_Tierney

Eocene

Second epoch of the Paleogene Period

tropics that would require much higher average temperatures to sustain them. TEX86 BAYSPAR measurements indicate extremely high sea surface temperatures of

Eocene

Cretaceous Thermal Maximum

Period of climatic warming that reached its peak approximately 90 million years ago

2017). "Cretaceous sea-surface temperature evolution: Constraints from TEX86 and planktonic foraminiferal oxygen isotopes". Earth-Science Reviews. 172:

Cretaceous Thermal Maximum

Cretaceous_Thermal_Maximum

Nitrososphaeria

Phylum of archaea

from marine sediments can be used to reconstruct past temperatures via the TEX86 paleotemperature proxy, as these lipids vary in structure according to temperature

Nitrososphaeria

Clathrate gun hypothesis

Meteorological hypothesis

excursion was detected. In 2007, chemical markers of surface temperature (TEX86) had also indicated that warming occurred around 3,000 years before the

Clathrate gun hypothesis

Clathrate_gun_hypothesis

Caldarchaeol

Chemical compound

contribution to iGDGT pool by methanogens (first used in 2009) Formula: TEX86 = ([GDGT-2] + [GDGT-3] + [Cren']) / ([GDGT-1] + [GDGT-2] + [GDGT-3] + [Cren'])

Caldarchaeol

Cenomanian-Turonian boundary event

Anoxic extinction event in the Cretaceous period

2017). "Cretaceous sea-surface temperature evolution: Constraints from TEX86 and planktonic foraminiferal oxygen isotopes". Earth-Science Reviews. 172:

Cenomanian-Turonian boundary event

Cenomanian-Turonian_boundary_event

Paleothermometer

Methodology for the study of ancient temperatures

used to reconstruct paleotemperature. This relationship is known as the TEX86 temperature proxy, named for the 86 carbon atoms in the lipid molecules

Paleothermometer

Biphytane

Chemical compound

GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry". Frontiers in Marine Science. 8. doi:10.3389/fmars.2021

Biphytane

Amelia E. Shevenell

American marine geologist

ocean temperature and climate evolution of the western Antarctic Peninsula. TEX86 proxy analysis of sediments from the western Antarctic Peninsula continental

Amelia E. Shevenell

Amelia_E._Shevenell

Nitrosopumilus

Genus of archaea

"Influence of temperature, pH, and salinity on membrane lipid composition and TEX86 of marine planktonic thaumarchaeal isolates". Geochimica et Cosmochimica

Nitrosopumilus