Results 91 to 100 of about 1,885,987 (306)

Late Holocene environmental history of Dojran, Macedonia: Investigating the interplay of imperial dynamics and climatic change

Journal of Quaternary Science, EarlyView.
ABSTRACT This study presents a high‐resolution, multi‐proxy reconstruction of environmental and land‐use change from Lake Dojran over historical times (last 2500 years), combining pollen, biomarkers, radiocarbon dating, Ottoman taxation records and other historical data.
Alessia Masi, Lucrezia Masci, Georgios C. Liakopoulos, Monica Bini, Alexander Francke, Ilaria Isola, Carlo Ricotta, Laura Sadori, Alexander Sarantis, Sławomir Sprawski, Jakub Sypiański, Irene Tunno, Cristiano Vignola, Bernd Wagner, Giovanni Zanchetta, Adam Izdebski   +15 more
wiley   +1 more source

Responses of primary producers, anoxia, and chemical feedback to Late Glacial climate change: Insights from a paired lake approach

Journal of Quaternary Science, EarlyView.
Abstract Worldwide, lacustrine ecosystems are threatened by eutrophication and deoxygenation. Both processes are driven by the combined effects of human activities and climate change. Understanding the pre‐anthropogenic nexus between warming, eutrophication, deoxygenation, and related feedback is essential to determine how lakes respond to rapid ...
Noé R.M.M. Schmidhauser, Stan J. Schouten, Petra Zahajská, Andrea Lami, Jacqueline F.N. van Leeuwen, Rik Tjallingii, Hendrik Vogel, Martin Grosjean   +7 more
wiley   +1 more source

Organic Geochemistry [PDF]

Nature, 1969
  +5 more sources

Mercury cycling during the last glacial period in Arctic Lake El'gygytgyn, NE Russia

Journal of Quaternary Science, EarlyView.
ABSTRACT Tectonic processes play a key role in the global mercury (Hg) cycle on geological timescales, by mobilising Hg from deep Earth reservoirs to the surface. These natural fluxes also introduce a dynamic component to the terrestrial Hg cycle that can interact with other environmental signals and influence Hg delivery to sedimentary records.
Alice R. Paine, Joost Frieling, Bernd Wagner, Martin Melles, Volker Wennrich, Tamsin A. Mather, Stuart A. Robinson, David M. Pyle   +7 more
wiley   +1 more source

Metabolism of microbial communities in the environment : A compound-specific stable hydrogen isotope approach [PDF]

, 2015
Microorganisms are key players in all elemental cycles, their metabolic activity and potential impacts the environment on a local and global scale. In order to understand this significant role in the environment, microbial communities, their diversity ...
Heinzelmann, S.M., Organic geochemistry & molecular biogeology, Organic geochemistry   +2 more
core   +1 more source

Topographic and Climatic Determinants of Soil Organic Carbon Across Landscapes: A Meta‐Analysis

Land Degradation &Development, EarlyView.
ABSTRACT The soil is the greatest natural store of organic carbon, holding between 1500 to 1550 Pg C of organic carbon at the top 100 cm of the soil globally—roughly twice the carbon pool in the atmosphere. The spatial distribution of this stock is controlled by a complex chain of controls: topographic position regulates the hydrological redistribution,
Vishal Sharma, Syed Hujjat ul Baligah, Tajamul Islam Shah, Shahid Shuja Shafai, Owais Bashir, Syed Sheraz Madhi, S. Naresh Kumar, Ayyandar Arunachalam, Shabir Ahmed Bangroo   +8 more
wiley   +1 more source

Detecting tropical peatland degradation: Combining remote sensing and organic geochemistry. [PDF]

PLoS One, 2023
Brown C, Boyd DS, Sjögersten S, Vane CH.   +3 more
europepmc   +1 more source

Silurian and Devonian source rocks and crude oils from the western part of Libya: Organic geochemistry, palynology and carbon stratigraphy [PDF]

, 2015
The Early Silurian “hot” shales and Late Devonian black shales are major regional oil and gas source rocks in North Africa. Their deposition probably played a major role in global carbon cycling in general because of the large areas of the ocean affected.
Elkelani, Mohamed M.A., Organic geochemistry and compound specific stable isotopes of the Libyan Silurian: depositional environment, carbon cycling and global impact, Organic geochemistry   +2 more
core  

Intercomparison of carbon‐13 and carbon‐14 tracer approaches for estimating marine calcification and net primary production

Limnology and Oceanography: Methods, EarlyView.
Abstract Accurate measurements of phytoplankton net primary production (NPP) and calcification are essential for quantifying marine carbon cycling, yet in situ calcification rates remain poorly constrained. We compared 13C‐ and 14C‐based tracer methods for NPP in laboratory cultures of the diatom Chaetoceros tenuissimus and the coccolithophore ...
Chloe L. Smith, Austin Grubb, Kay D. Bidle, Kimberlee Thamatrakoln, Adam V. Subhas   +4 more
wiley   +1 more source

Soil-derived branched tetraether membrane lipids in marine sediments: reconstruction of past continental climate and soil organic matter fluxes to the ocean [PDF]

, 2007
This thesis describes the structure and occurrence of branched glycerol dialkyl glycerol tetraether (GDGT) membrane lipids, their potential biological origin and shows their application in reconstructions of past environmental conditions.
Weijers, J.W.H., Organic geochemistry & molecular biogeology, IVAU: Instituut voor Aardwetenschappen Utrecht, Dep Aardwetenschappen, Organic geochemistry   +4 more
core   +22 more sources