Results 31 to 40 of about 92,659 (149)

Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Microbial Mats From Holocene and Miocene Sabkha Sediments

open access: yesFrontiers in Earth Science, 2019
Sabkhas are important settings for understanding early earth biological environments, and the algal mats associated with them are thought to be potential source rocks for hydrocarbon production.
Benjamin Petrick   +3 more
doaj   +1 more source

Deglacial and Holocene sea-ice and climate dynamics in the Bransfield Strait, northern Antarctic Peninsula [PDF]

open access: yesClimate of the Past, 2023
The reconstruction of past sea-ice distribution in the Southern Ocean is crucial for an improved understanding of ice–ocean–atmosphere feedbacks and the evaluation of Earth system and Antarctic ice sheet models.
M.-E. Vorrath   +22 more
doaj   +1 more source

Sedimentary lipid biomarkers in the magnesium rich and highly alkaline Lake Salda (south-western Anatolia)

open access: yesJournal of Limnology, 2016
Lake Salda located in south-western Anatolia is characterized by the presence of living stromatolites and by a low diversity of both phytoplankton and zooplankton due to high pH and magnesium concentration.
Jérôme Kaiser   +3 more
doaj   +1 more source

Isotopologue Ratios Identify <sup>13</sup>C-Depleted Biomarkers in Environmental Samples Impacted by Methane Turnover. [PDF]

open access: yesRapid Commun Mass Spectrom
ABSTRACT Rationale The stable carbon isotopic composition (δ13C) of individual lipids is of great value in studying carbon cycling. Among those, microbial lipids in sediments impacted by high methane turnover stand out due to their uniquely depleted isotopic fingerprint.
Groninga J, Lipp J, Song M, Hinrichs KU.
europepmc   +2 more sources

High-latitude environmental change during MIS 9 and 11: biogeochemical evidence from Lake El'gygytgyn, Far East Russia [PDF]

open access: yesClimate of the Past, 2013
Marine isotope stages (MIS) 11 has been proposed as an analog for the present interglacial; however, terrestrial records of this time period are rare.
R. M. D'Anjou   +5 more
doaj   +1 more source

Source, transport and fate of soil organic matter inferred from microbial biomarker lipids on the East Siberian Arctic Shelf [PDF]

open access: yesBiogeosciences, 2016
The Siberian Arctic contains a globally significant pool of organic carbon (OC) vulnerable to enhanced warming and subsequent release by both fluvial and coastal erosion processes.
J. Bischoff   +10 more
doaj   +1 more source

Asian Winter Monsoon Imprint on the Water Column Structure at the Northern South China Sea Coast

open access: yesFrontiers in Earth Science, 2021
Coastal regions of the northern South China Sea (SCS) strongly interact with the Asian monsoon circulation (AMC). Thus, variations of sea surface temperature (SST) here are newly suggested to document AMC changes in an effective manner, but additional ...
Yancheng Zhang   +11 more
doaj   +1 more source

Assessing branched tetraether lipids as tracers of soil organic carbon transport through the Carminowe Creek catchment (southwest England) [PDF]

open access: yesBiogeosciences, 2020
Soils represent the largest reservoir of organic carbon (OC) on land. Upon mobilization, this OC is either returned to the atmosphere as carbon dioxide (CO2) or transported and ultimately locked into (marine) sediments, where it will act as a long-term ...
J. Guo   +5 more
doaj   +1 more source

GDGT distributions on the East Siberian Arctic Shelf: implications for organic carbon export, burial and degradation [PDF]

open access: yesBiogeosciences, 2015
Siberian permafrost contains a globally significant pool of organic carbon (OC) that is vulnerable to enhanced warming and subsequent release into the contemporary carbon cycle.
R. B. Sparkes   +7 more
doaj   +1 more source

Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs [PDF]

open access: yesBiogeosciences, 2016
Presumed source specificity of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from bacteria thriving in soil/peat and isoprenoid GDGTs (iGDGTs) from aquatic organisms led to the development of several biomarker proxies for biogeochemical cycle ...
W. Xiao   +5 more
doaj   +1 more source

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