Results 61 to 70 of about 92,659 (149)

Early to Mid‐Holocene Cool Temperature‐Induced Drought in Asian Interior

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Hydroclimatic variations in mid‐latitude Asia during the early to mid‐Holocene and associated mechanisms remain disputed, hampering our understanding of atmospheric circulation controls on regional climatic changes. We report Holocene alkenone records from two Siberian lakes, documenting lake temperature and hydrological changes, and ...
Jiawei Jiang, Huanye Wang, Hu Liu, Guoqiang Chu, Weiguo Liu, Sergey Krivonogov, Zhonghui Liu   +6 more
wiley   +1 more source

Wide distribution of autochthonous branched glycerol dialkyl glycerol tetraethers (bGDGTs) in U.S. Great Basin hot springs

Frontiers in Microbiology, 2013
Branched glycerol dialkyl glycerol tetraethers (bGDGTs) are membrane-spanning lipids that likely stabilize membranes of some bacteria. Although bGDGTs have been reported previously in certain geothermal environments, it has been suggested that they may ...
Brian P. Hedlund, Julienne J Paraiso, Julienne J Paraiso, Amanda J Williams, Qiuyuan eHuang, Yuli eWei, Paul eDijkstra, Bruce A Hungate, Hailiang eDong, Chuanlun eZhang, Chuanlun eZhang   +10 more
doaj   +1 more source

Evaluating the Reliability of Grain‐Size Sorting for Organic Biomarker Analysis

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract Organic and inorganic geochemical proxies are fundamental for interpreting past climate variability. For inorganic analysis, marine sediments are often size fractionated to isolate foraminifera, while organic analysis employs subsamples of bulk sediment.
J. S. Hingley, P. S. Bray, T. Agterhuis, G. L. Foster, B. S. Wade, J. H. Whiteside, G. N. Inglis   +6 more
wiley   +1 more source

Compilation of worldwide branched GDGTs distribution, and MBT' and CBT determination in surface soils

, 2012
Only the surface soils (0-10 cm) were selected for this new calibration set. Branched GDGTs below detection limit are set to 0%
van der Meer, Jaap, Peterse, Francien, Weijers, Johan W H, Kim, Jung-Hyun, Johan W H Weijers (6980885), Jaap S Sinninghe Damsté (6885257), Jung-Hyun Kim (6976445), Sinninghe Damsté, Jaap S, Robert B Jackson (8005826), Jaap van der Meer (6958610), Schouten, Stefan, Fierer, Noah, Francien Peterse (6970094), Noah Fierer (121024), Jackson, Robert B, Stefan Schouten (6885260)   +15 more
core   +1 more source

Sea Surface Temperature and Salinity Changes in the Easternmost Mediterranean During the Pre‐Evaporitic Messinian Controlled by the Restriction at Gibraltar

Paleoceanography and Paleoclimatology, Volume 41, Issue 1, January 2026.
Abstract During the latest Miocene, the Mediterranean Basin was affected by extreme paleoceanographic and paleoenvironmental changes culminating with evaporite (gypsum and halite) formation during the Messinian Salinity Crisis (MSC: 5.97–5.33 Ma).
F. Lanterna, W. Krijgsman, L. Lourens, A. Mulch, I. Vasiliev   +4 more
wiley   +1 more source

Distribution of branched glycerol dialkyl glycerol tetraether (brGDGT) lipids from soils and sediments from the same watershed are distinct regionally (central Chile) but not globally

Frontiers in Earth Science
Quantitative reconstructions of past continental climates are vital for understanding contemporary and past climate change. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are unique bacterial lipids that have been proposed as universal ...
Molly D. O’Beirne, Wesley P. Scott, Sergio Contreras, Sergio Contreras, Sergio Contreras, A. Araneda, E. Tejos, J. Moscoso, Josef P. Werne   +8 more
doaj   +1 more source

In Situ Production of Branched Glycerol Dialkyl Glycerol Tetraethers in a Great Basin Hot Spring (USA)

Frontiers in Microbiology, 2013
Branched glycerol dialkyl glycerol tetraethers (bGDGTs) are predominantly found in soils and peat bogs. In this study, we analyzed core-bGDGTs and polar (P-) bGDGTs after hydrolysis of polar fractions using liquid chromatography-atmospheric pressure ...
Chuanlun eZhang, Chuanlun eZhang, Jinxiang eWang, Jinxiang eWang, Jeremy eDodsworth, Amanda eWilliams, Chun eZhu, Kai-Uwe eHinrichs, Fengfeng eZheng, Brian P. Hedlund   +9 more
doaj   +1 more source

Controls on brGDGT Production in the Seasonally Anoxic Water Column and Sediments of Rotsee (Lake Rot)

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 12, December 2025.
Abstract Reliable paleotemperature proxies are essential for reconstructing past climate. To refine interpretation of the MBT'5ME index, based on bacterial brGDGT lipids, a year‐long study was conducted in Rotsee, Switzerland, a seasonally stratified lake with a 4–21°C temperature range.
Fatemeh Ajallooeian, Nathalie Dubois, S. Nemiah Ladd, Mark Alexander Lever, Carsten Johnny Schubert, Cindy De Jonge   +5 more
wiley   +1 more source

Branched GDGTs of sediment and soil samples from Svalbard

, 2017
Branched glycerol dialkyl glycerol tetraethers (GDGTs) are membrane lipids of unknown bacteria that are ubiquitous in soil and peat. Two indices based on the distribution of these lipids in soils, the Cyclization of Branched Tetraethers (CBT) and the ...
Peterse, Francien, Schouten, Stefan, Francien Peterse (6970094), Kim, Jung-Hyun, Dorthe Klitgaard-Kristensen (6964655), Klitgaard-Kristensen, Dorthe, Jaap S Sinninghe Damsté (6885257), Jung-Hyun Kim (6976445), Koç, Nalân, Stefan Schouten (6885260), Sinninghe Damsté, Jaap S, Nalân Koç (6964682)   +11 more
core   +1 more source

Stepwise Cooling Events in the Western Arctic at 8.2 and 4.2 ka: Proxy Development and Application

Paleoceanography and Paleoclimatology, Volume 40, Issue 12, December 2025.
Abstract Hydroxylated glycerol dialkyl glycerol tetraether (GDGT)‐based proxies have recently been proposed for reconstructing sea surface temperatures (SSTs) in polar oceans, but their reliability has not yet been sufficiently validated. We investigated the spatial distribution of hydroxylated GDGTs in surface sediments from the western Arctic Ocean ...
Kenta Suzuki, Masanobu Yamamoto, Yu‐Hyeon Park, Seung‐Il Nam   +3 more
wiley   +1 more source