Sediments carbon isotopes. Medical search. Frequent questions

We present a detailed analysis of the seasonal distribution, size, morphological variability and geochemistry of co‐occurring pink and white chromotypes of Globigerinoides ruberfrom a high‐resolution (1-2 weeks) and long‐running sediment trap time series in the northern Gulf of Mexico. (usgs.gov)
Lake Qinghai sediment geochemistry linked to hydroclimate variability since the last glacial. (icdp-online.org)
Using combined transmitted-reflected light microscopy, scanning electron microscope imagery, electron microprobe elemental analysis and stable isotope geochemistry, the present study reveals four new aspects of the genus Pithonella , notably, the following. (bioone.org)
To provide a detailed reconstruction of coastal marine ecosystem change over the Holocene and study its linkages to climate and terrestrial freshwater inputs, organic-walled palynomorphs (including e.g. dinoflagellate cysts and pollen) and some basic geochemistry (including e.g. total organic carbon, C:N ratio, biogenic silica and stable isotopes of carbon and nitrogen) were examined from two radiometrically dated sediment cores from Young Sound fjord, Northeast Greenland. (helsinki.fi)
Working in the UNC isotope geochemistry lab, Kelsey wrote a research paper about using carbon isotope evidence from deer teeth to identify where the animals lived. (gulfresearchinitiative.org)
Silicon isotope geochemistry has potential to provide these reconstructions, given the competing source and process controls can be deconvolved. (lu.se)

In addition, we further tested if the isotopic signal of taraxerol from mangrove leaves could be preserved in sediment cores on a time scale of ca. 300 yrs. (unibas.ch)
Samples will be collected using minnow traps, purse seine nets, and shallow sediment cores. (nova.edu)
Sediment cores from nearby buried iceberg scours, or tracks, were used to determine when these icebergs travelled south along the coast. (usgs.gov)
Marine sediment cores that have such high-resolution are still a quite rare finding globally. (plos.org)
Finney bases this calculation on work he has done examining the sediment cores from lakes using a machine called a mass spectrometer. (isu.edu)
Bulk elemental composition and biogenic SiO 2 (bSiO 2 ) content, together with δ 30 Si and Ge/Si ratios from a single diatom species, Stephanodiscus yellowstonensis, were analysed in two sediment cores spanning the last 9880 cal. (lu.se)
Variation in bSiO 2 concentration through time is weakly correlated with an increase towards younger sediment in the δ 30 Si fossil diatom record in both cores. (lu.se)
To find their favourite animals the scientists drill long sediment cores from the seabed. (lu.se)
The small bottom-dwelling organisms that scientists find in the sediment cores from off the coast of Mauritania have been acting as links between ocean primary productivity and the benthic environment since the last ice age. (lu.se)
the sediment cores also reveal where the nutrients originated and this tells us something about how the climate varied in northern Africa. (lu.se)

Because most Nitrososphaerota seem to be autotrophs that fix CO2, their GDGTs can act as a record for past Carbon-13 ratios in the dissolved inorganic carbon pool, and thus have the potential to be used for reconstructions of the carbon cycle in the past. (wikipedia.org)
The use of stable carbon and nitrogen isotope ratios will help determine these trophic linkages. (nova.edu)
Instead, they precisely measure carbon isotope ratios. (icr.org)
Experts must therefore convert the isotope ratios into "ages" using a series of formulas. (icr.org)
Other studies analyzed the ratios of carbon isotopes in bulk soil samples to determine the ratio of C3 to C4 plant remains at different soil horizons, which correspond to different geological time periods. (scienceblog.com)
Rather than analyzing plant matter in bulk sediment samples, David Nelson, a postdoctoral researcher in Hu's lab at the time of the study (now a professor at the University of Maryland), analyzed the carbon isotope ratios of individual grains of grass pollen, a technique he pioneered while working with Hu in the lab of biogeochemistry professor Ann Pearson at Harvard University. (scienceblog.com)
We measured stable nitrogen (N) and carbon (C) isotope ratios, lignin-derived phenols, and fossil pigments in sediments of known ages to elucidate the historical changes in the ecosystem status of Lake Biwa, Japan, over the last 100 years. (slu.se)
Stable N isotope ratios and algal pigments in the sediments increased rapidly from the early 1960s to the 1980s, and then remained relatively constant, indicating that eutrophication occurred in the early 1960s but ceased in the 1980s. (slu.se)
Stable C isotope ratios of the sediment increased from the 1960s, but decreased after the 1980s to the present. (slu.se)
This decrease in stable C isotope ratios after the 1980s could not be explained by annual changes in either terrestrial input or algal production. (slu.se)
However, when the C isotope ratios were corrected for the Suess effect, the shift to more negative isotopic value in atmospheric CO2 by fossil fuel burning, the isotopic value showed a trend, which is consistent with the other biomarkers and the monitoring data. (slu.se)
We improve this resolution through high-resolution stratigraphy across the P/Tr boundary in the 331-m Gartnerkofel-1 core and nearby Reppwand outcrop section (Carnic Alps, Austria) utilizing FFT and wavelet timeseries analyses of cyclic components in down-hole core logs of density and natural gamma-ray intensity, and carbon-isotopic ratios of bulk samples. (nasa.gov)
Here, we analysed lake water, tributaries, and hydrothermal vent fluids from Yellowstone Lake for their dissolved Si concentrations, isotope composition (δ 30 Si) and Ge/Si ratios to evaluate the sources of variability in the lake's Si cycle. (lu.se)

By contrast, heavy metal concentrations in coastal sediments were found to be significantly higher than that of seawater. (intechopen.com)
39 surface sediment samples were obtained from these lakes and FA abundances were compared with methane concentrations measured at the lake surface, 10 cm above the sediments and 10 cm within the sediments. (diva-portal.org)
Our results confirm that robust relationships exist between in-lake CH 4 concentrations and 13 C-depleted groups of FAs in the examined sediments, agreeing with earlier suggestions that the availability of MOB-derived, C-13-depleted organic matter for aquatic invertebrates increases with increasing methane concentrations. (diva-portal.org)
Their ammonia oxidation pathway requires less oxygen than that of ammonia-oxidizing bacteria, so they do better in environments with low oxygen concentrations like sediments and hot springs. (wikipedia.org)
The determination of 1,4-dioxane at parts-per-billion (ppb or g/L) concentrations in samples where water is present (e.g., water, soil, sediment, and tissues) is difficult. (cdc.gov)
Sediment sampling at the SLAPS for total uranium, Th-230, and Ra-226 showed maximum concentrations of 1.7 pCi/g, 4.1 pCi/g, and bkg, respectively ( Bechtel, 1989a ) ( Table 1 ). (cdc.gov)
Sediment sampling at the HISS for total uranium, Th-230, and Ra-226 showed average concentrations of 1.7 pCi/g, 4.8 pCi/g, and 1.2 pCi/g, respectively ( Table 2 ) ( Bechtel, 1989b ). (cdc.gov)

The isotopic signature and spatial trends of taraxerol observed in mangrove leaves were well imprinted in mangrove surface sediments. (unibas.ch)
Spatial uniformity in the mineralogical and geochemical compositions of surface sediments in Lake Qinghai and their controlling factors. (icdp-online.org)
Carbon isotopic composition of isoprenoid tetraether in surface sediments of Lake Qinghai and surrounding soils. (icdp-online.org)

Analyses of the sulfur isotopic composition (δ 34 S) of pyrite from methane-bearing sediments have typically focused on bulk samples. (jove.com)
In soil, the distribution and carbon isotopic composition of n -alkane (d 13 C n -alk ) is extremely source-specific. (atlas.jp)
Comparison of the oxygen and carbon isotopic composition (δ 18 O and δ 13 C) of two morphotypes (sensu stricto and sensu lato) of pink G. ruber reveals the isotopes to be indistinguishable. (usgs.gov)
A compilation has been made of the carbon isotopic composition of over 1,600 samples of fossil kerogen (a complex organic macromolecule produced from the debris of biological matter) and compared with that from carbonates in the same sedimentary rocks. (palaeos.com)
Oxygen and carbon isotopic composition of bulk carbonates were measured in sections at Kőris-hegy (Bakony Mts. (lu.se)

Iron is an essential element in all living creatures, and its availability in seawater can have a profound effect on phytoplankton growth and, consequently, the Earth's carbon cycle. (sc.edu)
They've been collecting ocean samples and developing their analytical techniques for quantifying different natural isotopes of iron in seawater, which is one means of tracking the origins of the dissolved metal. (sc.edu)
The gas composition of the end Permian brachiopod-inclusions reflects dramatically higher seawater carbon dioxide and methane contents leading up to the biotic event. (wattsupwiththat.com)
However, the nature of deep microbial life in oceanic crust remains poorly understood, especially where old cold basaltic rock interacts with seawater beneath sediment. (darkenergybiosphere.org)

The area of WadiHowar is mainly characterized by sedimentary rocks (Nubian sandstone), aeolian sediments, fluvial and lacustrine deposits. (rupestre.net)
Interdisciplinary study of lacustrine sediments from Southeastern São Paulo state (Brazil). (usp.br)
Silicon (Si) is an essential macronutrient for diatoms, an important component of lacustrine primary productivity that represents a link between the carbon and silicon cycles. (lu.se)

The overall goal of this procedure is to analyze the In Situ sulfur isotopic compositions of various pyrite generations by secondary ion mass spectroscopy in order to understand the diagenetic history of pyritization in methane bearing sediments. (jove.com)
Proxy-indicators in lake sediments provide the only approach by which the dynamics of in-lake methane cycling can be examined on multi-decadal to centennial time scales. (diva-portal.org)
However, we also show that these relationships are complex, with different relationships observed for oxic and anoxic sediments and highest values measured in sediments deposited in oxic environments overlain with relatively methane-rich water. (diva-portal.org)
Initial global warming of 8-11 °C sourced by isotopically light carbon dioxide from volcanic emissions triggered the release of isotopically lighter methane from permafrost and shelf sediment methane hydrates. (wattsupwiththat.com)
Global warming triggered by the massive release of carbon dioxide may be catastrophic, but the release of methane from hydrate may be apocalyptic. (wattsupwiththat.com)
Kelsey Rogers looks for evidence of oil and methane intrusion into Gulf of Mexico water and sediment, but finding these hydrocarbons is only the beginning of her work. (gulfresearchinitiative.org)
Kelsey identifies the carbon isotopes in Gulf particulate and sediment samples to track oil and methane through the marine ecosystem. (gulfresearchinitiative.org)
Certain key isotope numbers serve as chemical fingerprints, signaling that the samples contain oil and methane. (gulfresearchinitiative.org)
Microbial methanogenesis was indicated by the isotopic compositions of methane and carbon dioxide, biomarkers, cultivation data, and gas compositions. (darkenergybiosphere.org)
Detailed knowledge about how climate and human activities influence the sources and sinks of greenhouse gases like carbon dioxide and methane is needed in order to make the informed and effective decisions needed for combating climate change. (lu.se)

To reconstruct the paleo-environmental conditions near an ancient fortress from Napatantimesin the first millennium BC a 6m deep soil profile in the Sudanese desert was studied using 14 C-dating and stable C isotope analyses. (rupestre.net)

Using a spooling-wire micro-combustion device to combust the grains, and an isotope mass spectrometer to determine the relative ratio of C-12 and C-13 in the sample, Nelson and Illinois graduate student Michael Urban analyzed hundreds of individual grains of grass pollen collected from study sites in Spain and France. (scienceblog.com)
Using a mass spectrometer at FSU, she calculates the stable carbon isotopes and then sends them to the University of Georgia to analyze their radiocarbon levels. (gulfresearchinitiative.org)

When the salmon die and they decompose they release nitrogen, which is in turn taken in by algae that end up in lake sediments. (isu.edu)
Yellowstone Lake sediments should be an archive of past silicon biogeochemistry, although the effect of sublacustrine hydrothermal activity or hydrothermal explosion events is unclear. (lu.se)

Therefore, the present study suggests that caution must be exercised while using n -alkanes as a paleoenvironmental indicator as the variations in d 13 C n -alk values in sediments is a cumulative product of temporal changes in the vegetation composition and post-depositional modifications experienced by the biomarker. (atlas.jp)
Some fundamental facts can be deduced from numerous experimental set-ups: feedstock composition, production temperature/carbonization degree and environmental conditions, e.g. soil properties 16 , 17 are the main influencing factors for black carbon longevity or short-term degradation. (nature.com)

Stable carbon isotopes in planktonic foraminifera are influenced by a variety of factors and are normally not so easy to interpret. (plos.org)

Chanton was using isotope analyses to track the Deepwater Horizon oil spill and its potential impacts on the marine food web. (gulfresearchinitiative.org)
Dominance of heterotrophic bacteria indicated by analyses of DNA sequences and lipids supports the importance of organic matter as carbon and energy sources in subseafloor basalt. (darkenergybiosphere.org)

Grain size of Lake Qinghai sediments: Implications for riverine input and Holocene monsoon variability. (icdp-online.org)
Landscape controls on riverine export of dissolved organic carbon from Great Britain. (exeter.ac.uk)

Stable isotopes of carbon (δ13C), sulfur (δ34S), oxygen (δ18O), hydrogen (δ2H), nitrogen (δ15N), and radioactive isotope of hydrogen (tritium) have been applied in combination with conventional techniques (chemical) to investigate Karachi coastal water pollution due to Layari and Malir rivers, which mainly carry the domestic and industrial wastewater of Karachi Metropolitan. (intechopen.com)

With atmospheric carbon dioxide levels now on the increase, he said, "there are also implications about how C3 and C4 plants will fare in the future. (scienceblog.com)

It can also dissolve carbonate sediment and alter seafloor elevation and form. (usgs.gov)
Unreefing", the ecological collapse of reefs, led to a regime shift, the transformation of the rimmed platform to a carbonate ramp, with a significant gap in production and preservation of carbonate sediment. (lu.se)

More certain is the report from Rosing (1999) of a biological carbon isotope signature from ~3,780 Ma (3,779 ± 81 Sm-Nd date) greywackes and slates with well-preserved sedimentary structures from the Garbenschiefer Formation in the Isua belt. (palaeos.com)

However, noticeably stronger and statistically significant relationships were observed when sediments from near-shore and deep-water oxic environments (r(s) = 0.57 to 0.62) and those from anoxic deep-water environment (r(s)= 0.55 to 0.65) were examined separately. (diva-portal.org)
For example, one source is sediments from the ocean's floor, from which iron is typically released into the ocean under very low-oxygen (anoxic) conditions, and release of 'light' iron-54 is favored. (sc.edu)

Stratigraphy and distribution of organic carbon-rich beds and the marine δ 13 excursion. (kirj.ee)

In biological syntheses, the processing of carbon [in] CO2 and carbonates gives a preference to the lighter carbon isotope and raises the ratio to about 92. (palaeos.com)

The ratio of the stable natural isotopes iron-56 and iron-54 from these sources can differ from the ratio in the Earth's crust because a number of chemical processes change the ratio by favoring the release of one of the two isotopes. (sc.edu)
We also need to assume a value for the carbon isotope ratio in the atmosphere at that time. (icr.org)
2 This newer study measured the carbon isotope ratio in seeds of the same plant, but these were harvested and archived in 1947. (icr.org)

The aim to quantify the stable carbon pool in soils and sediments and to understand the behavior of black carbon, its residence time, degradation, turnover rates and the associated influencing factors in the environment has prompted many studies, both lab and field experiments. (nature.com)
However, the potential abiotic degradation of acetochlor by hydroxyl radicals (â ¢OH) generated during oxygenation of hyporheic zone sediments has not been investigated. (bvsalud.org)
Our findings highlight the potential of CSIA to assess the acetochlor degradation in water-sediment system, which can help to elucidate the fate of herbicide in aquatic environments. (bvsalud.org)

After drying, separate the sediments into two aliquots, one for the collection of pyrite aggregates and the other for bulk sulfur extraction. (jove.com)

It may be used in conjunction with other radioactive isotopes, such as americium 241 and carbon 14, to categorize distinct fallout signatures in sediments and ice caps. (nerc.ac.uk)
Alpha particle ( ionizing radiation ) - two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. (cdc.gov)
Background radioactivity - radioactive elements in the natural environment including those in the crust of the earth (like radioactive potassium, uranium, and thorium isotopes) and those produced by cosmic rays. (cdc.gov)
Beta particle ( ionizing radiation ) - a charged particle emitted from the nucleus of certain unstable atomic nuclei (radioactive isotopes), having the charge and mass of an electron. (cdc.gov)

Forams like Uvigerina peregrina thrived during a period with a high contribution of fluvial sediment input. (lu.se)

34 °C) and oceanic negative-carbon isotope excursion observed at the end Permian. (wattsupwiththat.com)
In the Transdanubian Range, the initial carbon isotope excursion and at least the first part of the purported main carbon isotope excursion are not preserved due to the gap at the TJB. (lu.se)

He has used methods to trace ocean circulation patterns over time, to date marine shells found in ocean sediments, to study gas exchanges between the ocean and atmosphere, and to trace carbon as it cycles through the earth's chemical, physical and biological systems. (columbia.edu)
The team also deduced that most of Manam's emitted carbon is likely derived from the upper mantle, and not sediments from Earth's shallower crust, which they figured out by analysing different carbon isotopes in the gaseous mix. (sciencealert.com)
To take up a sediment core is like taking out a folder from an environmental archive of the earth's past. (lu.se)

This suggests that climate forcing, and soil formation ultimately govern the silicon isotope record, which we suggest is via a combination of changes in weathering stoichiometry, diatom production, and relative proportion of dSi sources. (lu.se)

Further quantifying the fluxes and contributions of sources to modern sediment in Lake Qinghai, NE Tibetan Plateau. (icdp-online.org)

This, and many other copepod-driven processes, help transport carbon down into the deep sea, where it may be locked away from the atmosphere for hundreds, or even thousands of years - thereby helping to regulate global climate. (exeter.ac.uk)
How do possible increased extreme events such as devastating storms and flooding affect carbon cycle processes and do we already see such perturbations? (lu.se)
What does the light (luminescence) from quartz tell us about sediment transport paths and processes? (lu.se)

The team extracted and sent for radiocarbon analysis small seeds from the track-bearing sediments. (icr.org)
He pioneered the development of techniques to measure radiocarbon and other chemical isotopes in the ocean. (columbia.edu)
The sediments on lake bottoms can be dated using radiocarbon dating, an accurate method for dating materials and by identifying ash layers from known volcanic events. (isu.edu)
Elemental (Total Organic Carbon TOC and Total Organic Nitrogen), isotopic (C and N), pollen analysis and radiocarbon dating were integrated on this work. (usp.br)

GDGTs) from marine sediments can be used to reconstruct past temperatures via the TEX86 paleotemperature proxy, as these lipids vary in structure according to temperature. (wikipedia.org)
Although flux of G. ruber is consistently lowest in winter, the flux‐weighted signal exported to marine sediments represents mean annual conditions in the surface mixed‐layer. (usgs.gov)
PLOS: Your recent work, published in PLOS ONE , investigated stable isotope data from a new marine core collected off of Iceland - how did using data with such a high temporal resolution (1-2 years) impact what we know about water mass changes? (plos.org)
I was part of a marine sediment coring campaign offshore South Africa in the beginning of 2020 and retrospectively, I am very happy that we managed to do everything as planned. (plos.org)
Click to enlarge) Kelsey Rogers worked alongside marine technician Jason Agnich to collect water and sediment samples from the Gulf of Mexico. (gulfresearchinitiative.org)
Microbial life inhabits deeply buried marine sediments, but the extent of this vast ecosystem remains poorly constrained. (darkenergybiosphere.org)
Recently, precise absolute dating has bracketed the marine extinctions and associated carbon-isotope anomaly within less than 1 Myr. (nasa.gov)

Transfer the slurry into a 063 millimeter civ and sift the sediment with distilled water so that all fine grains are washed through the civ. (jove.com)
For the first time, the James Webb Space Telescope has observed the chemical signature of carbon-rich dust grains in the early universe. (phys.org)
Most compelling were large grains of shocked quartz found in Permian sediments in Australia. (astronomy.com)

Sparse microbial populations persist from seafloor to basement in the slowly accumulating oxic sediment of the oligotrophic South Pacific Gyre (SPG). (darkenergybiosphere.org)
Our results suggest that microbial communities widely distributed in organic-poor abyssal sediment consist mainly of aerobes that retain their metabolic potential under extremely low-energy conditions for up to 101.5 Ma. (darkenergybiosphere.org)
Nanoscale solid characterizations reveal the organic carbon to be microbial cells within the Fe-rich smectite, with cell densities locally exceeding 10 10 cells/cm 3 . (darkenergybiosphere.org)
Here we provide evidence for the existence of microbial communities in ~40° to 60°C sediment associated with lignite coal beds at ~1.5 to 2.5 km below the seafloor in the Pacific Ocean off Japan. (darkenergybiosphere.org)

During recent research in Antarctica, her team also found meteoritic fragments in a thin layer of Permian sediment. (astronomy.com)

Specific formation conditions result in chemical and physical differences between the pyrogenic carbon fraction in biochars and wildfires 22 . (nature.com)

With increasing sulfate content, the total organic carbon/total sulfur (TOC/TS) in the formation decreased, and the sulfate δ 34 S produced a negative bias. (kirj.ee)

The sharp negative global carbon-isotope shift took place within less than or equal to 40,000 yr, and the isotope excursions persisted for approximately 480,000 yr into the Early Triassic. (nasa.gov)
In each of the studied sections, an abrupt negative carbon isotope shift is recorded at the TJB, and a gradual rebound to more positive values characterizes the lowermost Jurassic strata. (lu.se)

Compound-specific isotope analysis (CSIA) further suggests that â ¢OH produced by sediment oxygenation plays a critical role in acetochlor attenuation in aquatic environments. (bvsalud.org)

And it takes very little iron to keep this process going - in a typical cell, for every atom of iron, there are about a million atoms of carbon, says John. (sc.edu)
Carbon-14 ( 14 C) atoms are like needles in carbon-12 haystacks. (icr.org)
Becker and her coworkers have previously reported specific isotopes of helium and argon trapped inside fullerenes - a cage-like formation of carbon atoms - which they believe came from space. (astronomy.com)
C3 and C4 refer to the number of carbon atoms in the first molecular product of photosynthesis. (scienceblog.com)

The high-precision determination of elements, stable isotopes and biomarkers of the Nenjiang Formation oil shale samples was tested in this study. (kirj.ee)

Hence, the distribution and d 13 C values of n -alkane in sediments have been primarily used to characterize the source(s) of organic matter in a given depositional environment as well as to gain insight into paleoenvironmental conditions. (atlas.jp)

Through detailed physical and chemical studies of fossils and sediments, I hope to add some puzzle pieces to the history of Earth and life. (lu.se)

To begin, clean the surface of a sediment core and collect a set of samples across the entire length using a knife. (jove.com)
When ready to continue, transfer the wet sediment samples into pre-cleaned beakers and place them in an oven at 40 degrees Celsius for 24 hours to dry them out. (jove.com)
Three of the FAs in the surface sediment samples, C-16(:1 omega 7c), C-16(:1 omega 5c/t), and C-18(:1 omega 7c) were characterized by lower delta C-13 values than the remaining FAs. (diva-portal.org)
Click to enlarge) Kelsey Rogers collects samples of sediment particles onboard the R/V Endeavor's laboratory. (gulfresearchinitiative.org)
Click to enlarge) Kelsey Rogers onboard the R/V Endeavor, one of five field expeditions she participated in, collecting water and sediment samples in the Gulf of Mexico. (gulfresearchinitiative.org)
Click to enlarge) Researchers use a multi-corer to collect sediment samples in the Gulf of Mexico. (gulfresearchinitiative.org)
She also collected water column samples 20 liters at a time, then filtered and dried suspended particles for later lab isotope analysis. (gulfresearchinitiative.org)
Spectrometers accurately measure the different types of isotopes of the same element such as carbon or nitrogen in biological or geological samples. (isu.edu)

The shells are made of calcium carbonate, which means that they mainly consist of the elements calcium, carbon and oxygen. (lu.se)
Elements exist in different variations - isotopes - and it is the proportion of oxygen isotopes in the foram shells that, for example, reveals changes in global temperature and in global ice volume. (lu.se)
The proportion of carbon isotopes in the shells tells us about changes in ocean circulation, but also of local changes in upwelling areas. (lu.se)
The proportion of oxygen isotopes in the shells reveals changes in global temperature and in global ice volume. (lu.se)

The most challenging sampling campaign was in Mozambique as part of a wider trip from Zambia to South Africa with the aim to collect modern day river sediments. (plos.org)

A 2021 study had assigned an age of about 22,000 carbon years to sediments that hold mammoth, giant sloth, and human footprints found in the ancient Lake Otero Basin. (icr.org)
Clay mineral records of the Erlangjian drill core sediments from the Lake Qinghai Basin, China. (icdp-online.org)

Considering the consistent salinity-dependent discrimination of H-2 to salinity, and no significant diagenetic alteration of taraxerol delta H-2 values on centennial time scales, taraxerol H isotopes are a promising proxy for hydroclimate reconstruction in mangrove and mangrove-adjacent systems. (unibas.ch)

One sediment core collected at the margins of a lake surrounded by Atlantic rainforest vegetation at Parque Estadual do Alto Ribeira (PETAR), southern São Paulo state (Brazil), was analyzed, in order to reconstruct the history of the local vegetation over the last 2500 years. (usp.br)

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