Results 21 to 30 of about 1,279 (147)

Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO2

Geophysical Research Letters, 2023
The Eocene (56–34 million years ago) is characterized by declining sea surface temperatures (SSTs) in the low latitudes (∼4°C) and high southern latitudes (∼8–11°C), in accord with decreasing CO2 estimates.
Gordon N. Inglis, Rehemat Bhatia, David Evans, Jiang Zhu, Wolfgang Müller, David Mattey, David J. R. Thornalley, Richard G. Stockey, Bridget S. Wade   +8 more
doaj   +1 more source

Sources, Distribution and Paleoenvironmental Application of Fatty Acids in Speleothem Deposits From Krem Mawmluh, Northeast India

Frontiers in Earth Science, 2021
Integrated multiproxy geochemical studies are essential to reconstruct the paleoenvironment through different time scales. Pristine terrestrial archives such as speleothems provide an excellent opportunity to study these changes by measuring the stable ...
M. S. Kalpana, Joyanto Routh, Susanne Fietz, Mahjoor A. Lone, Mahjoor A. Lone, Augusto Mangini   +5 more
doaj   +1 more source

Surface Ocean Hydrographic Changes in the Western Pacific Marginal Seas Since the Early Holocene

Frontiers in Earth Science, 2020
Climatic changes in the western Pacific marginal seas are influenced by global forcing and regional processes, including monsoons, and ocean circulation.
Hui-Juan Pan, Min-Te Chen, Min-Te Chen, Min-Te Chen, Deming Kong, Xiaopei Lin, Kuo-Tsan Wong, Hung-Ling Tsai, Shengfa Liu, Shengfa Liu, Xuefa Shi, Xuefa Shi, Yosuke Yokoyama   +12 more
doaj   +1 more source

Development of a novel sea surface temperature proxy based on bacterial 3-hydroxy fatty acids

Frontiers in Marine Science, 2023
Gram-negative bacterial 3-hydroxy fatty acids (3-OH-FAs) have received recent attention for their potential as palaeoclimate proxies. A novel temperature proxy, the ratio of anteiso to normal C13 3-OH-FA (RAN13), has been proposed for sea surface ...
Zhengkun Dong, Yi Yang, Yi Yang, Canfa Wang, James A. Bendle, Xiaoyan Ruan, Xiaoxia Lü, Shucheng Xie   +7 more
doaj   +1 more source

Evaluating Production of Cyclopentyl Tetraethers by Marine Group II Euryarchaeota in the Pearl River Estuary and Coastal South China Sea: Potential Impact on the TEX86 Paleothermometer

Frontiers in Microbiology, 2017
TEX86 [TetraEther indeX of glycerol dialkyl glycerol tetraethers (GDGTs) with 86 carbon atoms] has been widely applied to reconstruct (paleo-) sea surface temperature.
Jin-Xiang Wang, Jin-Xiang Wang, Wei Xie, Yi Ge Zhang, Travis B. Meador, Chuanlun L. Zhang, Chuanlun L. Zhang   +6 more
doaj   +1 more source

Marine Group II Euryarchaeota Contribute to the Archaeal Lipid Pool in Northwestern Pacific Ocean Surface Waters

Frontiers in Microbiology, 2020
Planktonic archaea include predominantly Marine Group I Thaumarchaeota (MG I) and Marine Group II Euryarchaeota (MG II), which play important roles in the oceanic carbon cycle. MG I produce specific lipids called isoprenoid glycerol dibiphytanyl glycerol
Cenling Ma, Sarah Coffinet, Julius S. Lipp, Kai-Uwe Hinrichs, Chuanlun Zhang, Chuanlun Zhang   +5 more
doaj   +1 more source

Separation of Branched and Isoprenoid Glycerol Dialkyl Glycerol Tetraether (GDGT) Isomers in Peat Soils and Marine Sediments Using Reverse Phase Chromatography

Frontiers in Marine Science, 2020
Over the last decade, glycerol dialkyl glycerol tetraethers (GDGTs) have become one of the most investigated lipid classes in marine and terrestrial organic geochemical research. GDGTs are microbial membrane core lipids biosynthesized as multiple homolog
Jayne E. Rattray, Rienk H. Smittenberg
doaj   +1 more source

Vegetation response to exceptional global warmth during Oceanic Anoxic Event 2

Nature Communications, 2018
The Cretaceous Oceanic Anoxic Event 2 represents one of the warmest episodes in the last 250 million years. Here, the authors present spore-pollen data and temperature estimates (TEX86) across an expanded stratigraphic section illustrating the dynamic ...
Ulrich Heimhofer, Nina Wucherpfennig, Thierry Adatte, Stefan Schouten, Elke Schneebeli-Hermann, Silvia Gardin, Gerta Keller, Sarah Kentsch, Ariane Kujau   +8 more
doaj   +1 more source

Paleoecological evidence for decadal increase in phytoplankton biomass off northwestern Australia in response to climate change

Ecology and Evolution, 2018
Ocean warming can modify the phytoplankton biomass on decadal scales. Significant increases in sea surface temperature (SST) and rainfall in the northwest of Australia over recent decades are attributed to climate change.
Zineng Yuan, Dongyan Liu, John K. Keesing, Meixun Zhao, Shixin Guo, Yajun Peng, Hailong Zhang   +6 more
doaj   +1 more source

TEX86 and BIT in Lake Challa sediments

, 2012
TEX86 and BIT in Lake Challa ...
Schouten, Stefan, Ossebaar, Jort, Jaap S Sinninghe Damsté (6885257), Dirk Verschuren (8020796), Jort Ossebaar (8007473), Verschuren, Dirk, Stefan Schouten (6885260), Sinninghe Damsté, Jaap S   +7 more
core   +1 more source