Results 11 to 20 of about 1,382,192 (301)

Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. [PDF]

, 2007
Diatom-based oxygen isotope data (δ18Odiatom) from Lake Malawi show multi-centennial scale wetâ dry intervals spaced approximately every 2.3 ka throughout a 25 ka sequence.
Leng, Melanie J., Huang, Yongsong, Barker, Philip A., Gasse, Françoise   +3 more
core   +6 more sources

Examination of the parameters controlling the triple oxygen isotope composition of grass leaf water and phytoliths at a Mediterranean site: a model–data approach [PDF]

Biogeosciences, 2023
Triple oxygen isotopes (17O-excess) of water are useful to trace evaporation at the soil–plant–atmosphere interface. The 17O-excess of plant silica, i.e., phytoliths, inherited from leaf water, was previously calibrated in growth chambers as a proxy of ...
C. Voigt, C. Voigt, A. Alexandre, I. M. Reiter, J.-P. Orts, C. Vallet-Coulomb, C. Piel, J.-C. Mazur, J. C. Aleman, C. Sonzogni, H. Miche, J. Ogée   +11 more
doaj   +1 more source

Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS [PDF]

Zhipu Xuebao, 2022
Carbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions.
HAN Juan, LIU Han-bin, JIN Gui-shan, ZHANG Jian-feng, LI Jun-jie, ZHANG jia, SHI Xiao   +6 more
doaj   +1 more source

Oxygen isotope ecology of recent planktic foraminifera at the central Walvis Ridge (SE Atlantic) [PDF]

, 2005
Above the Walvis Ridge, in the SE Atlantic Ocean, we collected living plantkic foraminifera from the upper water column using depth stratified plantkon tows. The oxygen isotope composition (
Kroon, Dirk, Dick Kroon, Brummer, G.J.A., Neven Lončarić, Brummer, G. J. A., Kroon, D., Peeters, F. J. C., Peeters, F.J.C., Geert‐Jan A. Brummer, Loncaric, N., Frank J. C. Peeters   +10 more
core   +2 more sources

Stable oxygen and carbon isotope compositional fields for skeletal and diagenetic components in New Zealand Cenozoic nontropical carbonate sediments and limestones: A synthesis and review [PDF]

, 1996
The stable oxygen isotope composition (δ18O) of a precipitated carbonate depends mainly on the isotope composition, salinity, and temperature of the host fluid, whereas the stable carbon isotope composition (δ13C) reflects the source of CO2 for ...
Nelson, Campbell S., Campbell S. Nelson, Smith, Abigail M., Abigail M. Smith   +3 more
core   +1 more source

Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques [PDF]

, 2009
Internationally distributed organic and inorganic oxygen isotopic reference materials have been calibrated by six laboratories carrying out more than 5300 measurements using a variety of high-temperature conversion techniques (HTC) in an evaluation ...
Weise, Stephan M., Mroczkowski, S. J., Brand, Willi A., Qi, H., Stuart-Williams, Hilary,, Geilmann, Heike, Aerts-Bijma, A. T., Weise, S. E., Jansen, H., Geilmann, Heike,, Qi, Haiping, Coplen, T. B., Bohlke, J., Coplen, Tyler B.,, J. K. Böhlke, Qi, H. P., Aerts-Bijma, Anita T.; id_orcid, Meijer, Harro A. J., Weise, S., Soergel, Karin,, Groning, M., Böhlke, J.K., Gröning, Manfred,, Stephan M. Weise, Gröning, Manfred, Haiping Qi, Anita T. Aerts‐Bijma, Jansen, Henk G.,, Heike Geilmann, Meijer, H. A. J., Gehre, Matthias, Jansen, Henk G., Meijer, Harro A. J.; id_orcid, Roland A. Werner, Werner, Roland A.,, Coplen, Tyler B., Böhlke, J.K.,, Werner, R., Werner, Roland A., Geilmann, H., Jansen, H. G., Aerts-Bijma, Anita T., Stuart-Williams, H., Karin Soergel, Henk G. Jansen, Stanley J. Mroczkowski, Aerts-Bijma, Anita T.,, Gehre, Matthias,, Gehre, M., Bohlke, J. K., Mroczkowski, Stanley J.,, Meijer, Harro A.J.,, Meijer, H., Mroczkowski, S., Mroczkowski, Stanley J., Brand, W., Tyler B. Coplen, Soergel, Karin, Hilary Stuart‐Williams, Weise, Stephan M.,, Willi A. Brand, Aerts-Bijma, A., Matthias Gehre, Brand, Willi A.,, Manfred Gröning, Soergel, K., Coplen, T., Qi, Haiping,, Stuart-Williams, Hilary, Harro A. J. Meijer   +69 more
core   +1 more source

Application of Modified DDARP Method for Purification of Barite in Natural Water Samples

Yankuang ceshi, 2019
BACKGROUND Diethylenetriaminepentaacetic acid (DTPA) dissolution and reprecipitation (DDARP) method is used frequently to eliminate encapsulated nitrate during barite precipitation. However, the effect of DDARP on barite precipitated from different kinds
ZHANG Dong, LI Yu-hong, ZHANG Hong-yu, HAO Wei-bo, YAN Wen-rong, YANG Wei, JIA Bao-jun   +6 more
doaj   +1 more source

The Precambrian marine carbonate isotope database: version 1.1. [PDF]

, 2002
We present a compilation of strontium, carbon, and oxygen isotope compositions of roughly 10,000 marine carbonate rocks of Archean - Ordovician age (3800 Ma – 450 Ma).
Shields, GA, Veizer, J, Ján Veizer, Graham Shields, Shields, Graham, Veizer, Ján   +5 more
core   +1 more source

^<18>O/^<16>O Activity Ratio at 0℃ of Salt Water of Don Juan Pond and Lake Bonney, Dry Valleys, Antarctica

Antarctic Record, 1977
The oxygen isotope ratio determined from CO_2 equilibrated isotopically with the water sample provides the oxygen isotope activity ratio of the water sample.
Kikuo KATO
doaj   +1 more source

The nitrogen isotope effect of benthic remineralization-nitrification-denitrification coupling in an estuarine environment [PDF]

, 2011
The nitrogen (N) stable isotopic composition of pore water nitrate and total dissolved N (TDN) was measured in sediments of the St. Lawrence Estuary and the Gulf of St. Lawrence.
Lehmann, M. F., M. Alkhatib, P. A. del Giorgio, Alkhatib, M., del Giorgio, P. A., M. F. Lehmann, Arroyave Gómez, Diana Marcela   +6 more
core   +2 more sources