Article
Geochemistry & Geophysics
Jochem Baan, Meisha Holloway-Phillips, Daniel B. Nelson, Ansgar Kahmen
Summary: Variation in plant organic compound 82H and 818O values among species is common, but the extent to which this is driven by leaf water or biochemical isotope effects is unclear. Comparing leaf water and organic compound isotope values across 192 species, we found that variation in leaf water values may not strongly drive the variation in organic compound values.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Plant Sciences
Tatjana C. Speckert, Fanny Petibon, Guido L. B. Wiesenberg
Summary: Leaf cuticular waxes play a crucial role in reducing evapotranspiration, but it remains unclear how mature trees adjust their wax biosynthesis to changing conditions. In this study, we investigated the formation of wax constituents in sun-exposed and shaded branches of mature European beech tree during the late summer. Our results showed ongoing modifications in the composition of n-alkanes and fatty acids, indicating de-novo biosynthesis. Moreover, sun-exposed leaves had higher concentrations of n-alkanes and invested more assimilated carbon into lipids than shaded leaves.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Environmental Sciences
S. N. Ladd, A. E. Maloney, D. B. Nelson, M. Prebble, G. Camperio, D. A. Sear, J. D. Hassall, P. G. Langdon, J. P. Sachs, N. Dubois
Summary: Globally, there is a strong positive linear correlation between hydrogen isotope ratios of sedimentary leaf waxes and mean annual precipitation. The results suggest that sedimentary leaf wax hydrogen isotope values are currently most suitable for detecting large changes in precipitation in the tropical Pacific and elsewhere. However, there is room for improvement in understanding hydrogen isotope variability in plants and precipitation.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geochemistry & Geophysics
Paul Strobel, Julian Struck, Enkhtuya Bazarradnaa, Michael Zech, Roland Zech, Marcel Bliedtner
Summary: This study systematically investigates the spatial distribution of terrestrial and aquatic hydrogen isotopic signals in lake sediments, providing valuable insights into hydrological conditions. The results reveal the influence of water availability on the isotopic composition of n-alkanes and suggest that the isotopic offset between terrestrial and aquatic n-alkanes can be used as a proxy for past hydrological changes.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Ioana C. Stefanescu, Chandelle Macdonald, Craig S. Cook, David G. Williams, Bryan N. Shuman
Summary: By analyzing the d2H values of leaf wax n-alkanes in plants and lake sediments, we found that in mid-latitude North America, both mid-and long-chain n-alkanes in lake sediments commonly derive from terrestrial higher plants, challenging the assumption that submerged aquatic plants produce the n-C23-alkane preserved in lake sediments. Moreover, angiosperm and gymnosperm plants exhibit similar eapp values between n-C29 and mean annual precipitation (MAP) d2H values across North America. Therefore, vegetation shifts between angiosperm and gymnosperm plants do not strongly affect eapp values between n-C29 and MAP. Our results show that both mid-and long-chain n-alkanes track the isotopic composition of MAP in temperate North America.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
D. J. Bertassoli, C. Haeggi, C. M. Chiessi, E. Schefuss, J. Hefter, T. K. Akabane, A. O. Sawakuchi
Summary: This study investigates the distribution of glycerol dialkyl glycerol tetraether (GDGT) and n-alkane isotopes in soils and sediments from the Amazon River Basin, and examines the impact of sources and transport processes on their distribution.
Article
Biology
Xin Chen, Xiaodong Liu, Hongzeng Jia, Jing Jin, Weidong Kong, Yongsong Huang
Summary: Recent studies have found long-chain n-alkanes and n-alkanoic acids in sediments of desolate Antarctic ponds without vascular plants, displaying hydrogen isotopic values up to 300 per mil higher than lake water. This strongly inverse isotopic fractionation is believed to be predominantly produced by heterotrophic micro-organisms, based on experimental data. This represents the first clear example of heterotrophic microbial production of long-chain n-alkyl waxes in a natural environment.
Article
Geochemistry & Geophysics
Hu Liu, Yunning Cao, Jing Hu, Zhonghui Liu, Weiguo Liu
Summary: The study investigated the compound-specific delta D deviations with varying contents injected using isotope ratio mass spectrometry, finding higher delta D values with decreasing amplitudes and larger deviations occurring in low amplitude range. For lab working standards, n-alkane delta D values varied significantly with changes in amplitudes, while repeated analyses of natural samples yielded higher delta D values with lower amplitudes and lower values with higher amplitudes. Amplitude-based correction of lipid delta D values may be attempted, but caution is needed due to large residual errors.
Article
Engineering, Environmental
Kasper Kristensen, David M. Lunderberg, Yingjun Liu, Pawel K. Misztal, Yilin Tian, Caleb Arata, William W. Nazaroff, Allen H. Goldstein
Summary: Semivolatile organic compounds (SVOCs) are an important category of indoor pollutants. The partitioning of SVOCs between airborne particles and the adjacent air significantly influences human exposure and uptake. This study provides direct evidence that indoor particle pollution from cooking, candle use, and outdoor particle infiltration strongly affects the gas-particle phase distribution of specific indoor SVOCs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Hope Sisley, Matthew Wolhowe, Jon Rowe, Alexis Licht, Julian Sachs
Summary: This study analyzes the hydrogen isotope ratios (d(2)H) of n-alkanes derived from leaf wax samples collected along the Cascade mountain range in Washington State, USA. The results show a correlation between d(2)H values of soil and gymnosperm leaves with annual precipitation d(2)H values and nearby surface water d(2)H values. The data also indicate an increasing deuterium (H-2) depletion with distance from the coast due to Rayleigh distillation induced by the mountains.
ORGANIC GEOCHEMISTRY
(2023)
Article
Geography, Physical
Jessica E. Tierney, Adi Torfstein, Tripti Bhattacharya
Summary: The eastern Mediterranean is expected to see increasing drought and extreme rainfall. The Dead Sea lacustrine record provides valuable insights into the region's climate change and water balance. Analysis of leaf wax isotopes suggests a coherent regional signature of glacial-interglacial cycles and the interaction between winter rainfall and the Afro-Asian monsoon system.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Marine & Freshwater Biology
Ding He, Victor H. Rivera-Monroy, Rudolf Jaffe, Xiaochen Zhao
Summary: Distinct differences in green leaves wax n-alkane delta(13)(delta C-13(n-alkane)) values and brown-senescent leaves C:N atomic ratios and total phosphorus (TP) concentrations of three mangrove species reflect ecophysiological adaptations to nutrient availability and salinity. Isotopic footprints and bulk delta C-13 values in different species along estuarine salinity regions suggest potential for using leaf wax n-alkane delta C-13 values as a salinity proxy for paleoclimate reconstruction.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Geochemistry & Geophysics
Anic Imfeld, Alexandre Ouellet, Peter M. J. Douglas, Gregor Kos, Yves Gelinas
Summary: Sediments contain a variety of inorganic and organic components, with the composition of organics not fully characterized. Research focused on n-alkanes in coastal sediments shows variations in abundance and sources along the terrestrial-marine continuum. Isotopic analysis of odd and even n-alkanes can be used to determine their sources.
ORGANIC GEOCHEMISTRY
(2022)
Article
Geography, Physical
Margarita Jambrina-Enriquez, Carolina Mallol, Gilbert Tostevin, Gilliane Monnier, Goran Pajovic, Nikola Borovinic, Mile Bakovic
Summary: This study presents a hydroclimatic reconstruction from Crvena Stijena rock shelter in Montenegro, Balkan Peninsula. The researchers integrated lipid biomarkers, hydrogen isotopic compositions, and organic elemental geochemistry to reconstruct the hydrological and environmental changes during the MIS 3. The study found evidence of aridity trends and identified correlations with the Heinrich Event 5.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Mathew L. Fox, Jessica Tierney, Huayu Lu, Shejiang Wang, Wenting Xia, Hongyan Zhang, Jiang Wu
Summary: This study presents the first leaf wax record associated with Paleolithic occupations in the Eastern Qinling Mountains of central China. The results show observable differences between the southern and northern Qinling Mountains and highlight the expansion of forest-grassland mosaics and less expedient technologies in the northern Qinling Mountains. The carbon isotopic values of leaf wax lipids provide insights into the vegetation changes and the emergence of different Paleolithic technologies.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
T. C. Johnson, J. P. Werne, E. T. Brown, A. Abbott, M. Berke, B. A. Steinman, J. Halbur, S. Contreras, S. Grosshuesch, A. Deino, R. P. Lyons, C. A. Scholz, S. Schouten, J. S. Sinninghe Damste
Article
Geochemistry & Geophysics
Jens Gruetzner, Francisco J. Jimenez Espejo, Nambiyathodi Lathika, Gabriele Uenzelmann-Neben, Ian R. Hall, Sidney R. Hemming, Leah J. LeVay, S. Barker, M. A. Berke, L. Brentegani, T. Caley, A. Cartagena-Sierra, C. D. Charles, J. J. Coenen, J. G. Crespin, A. M. Franzese, X. Han, S. K. V. Hines, J. Just, A. Koutsodendris, K. Kubota, R. D. Norris, T. P. Santos, R. Robinson, J. M. Rolinson, M. H. Simon, D. Tangunan, H. J. L. van der Lubbe, M. Yamane, H. Zhang
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geochemistry & Geophysics
Melissa A. Berke, Alejandra Cartagena Sierra, Rosemary Bush, Darren Cheah, Keith O'Connor
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geography, Physical
Andreas Koutsodendris, Frederik J. Allstaedt, Oliver A. Kern, Ilias Kousis, Florian Schwarz, Martina Vannacci, Amber Woutersen, Erwin Appel, Melissa A. Berke, Xiaomin Fang, Oliver Friedrich, Carina Hoorn, Ulrich Salzmann, Joerg Pross
GLOBAL AND PLANETARY CHANGE
(2019)
Article
Geosciences, Multidisciplinary
Audrey K. Taylor, Melissa A. Berke, Isla S. Castaneda, Andreas Koutsodendris, Hernan Campos, Ian R. Hall, Sidney R. Hemming, Leah J. LeVay, Alejandra Cartagena Sierra, Keith O'Connor
Summary: Efforts to understand long-term Indian Ocean dynamics and land-sea linkages in southeast Africa have been advanced using new biomarker and pollen records to fill a research gap between 4 and 1.8 million years ago. The study revealed a linkage between Indian Ocean temperatures and southeast African hydroclimate, as well as proposed additional mechanisms that may have influenced hydroclimate during the Plio-Pleistocene.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Alejandra Cartagena-Sierra, Melissa A. Berke, Rebecca S. Robinson, Basia Marcks, Isla S. Castaneda, Aidan Starr, Ian R. Hall, Sidney R. Hemming, Leah J. LeVay
Summary: The study of the meridional variability of the Subtropical Front (STF) in the Southern Hemisphere near the Agulhas Plateau reveals that the migrations of the STF may have influenced the Agulhas Leakage during the mid-Pleistocene transition. Combined with prior evidence, it suggests that during MIS 23-12, the STF may have been further south, reaching its northernmost position during MIS 34-24 and MIS 10. This detachment between STF migrations and Agulhas Leakage, along with shifting westerly winds, may explain changes in CO2 ventilation seen during the mid-Pleistocene.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Geochemistry & Geophysics
Georg Schwamborn, Kai Hartmann, Bernd Wuennemann, Wolfgang Roesler, Annette Wefer-Roehl, Joerg Pross, Marlen Schloeffel, Franziska Kobe, Pavel E. Tarasov, Melissa A. Berke, Bernhard Diekmann
Article
Geosciences, Multidisciplinary
James M. Russell, Philip Barker, Andrew S. Cohen, Sarah Ivory, Ismael Kimirei, Christine S. Lane, Melanie J. Leng, Neema Maganza, Michael McGlue, Emma Msaky, Anders Joseph Noren, Lisa Park Boush, Walter Salzburger, Christopher Scholz, Ralph Tiedemann, Shaidu Nuru
SCIENTIFIC DRILLING
(2020)
Article
Geosciences, Multidisciplinary
Jennifer R. Marlon, Neil Pederson, Connor Nolan, Simon Goring, Bryan Shuman, Ann Robertson, Robert Booth, Patrick J. Bartlein, Melissa A. Berke, Michael Clifford, Edward Cook, Ann Dieffenbacher-Krall, Michael C. Dietze, Amy Hessl, J. Bradford Hubeny, Stephen T. Jackson, Jeremiah Marsicek, Jason McLachlan, Cary J. Mock, David J. P. Moore, Jonathan Nichols, Dorothy Peteet, Kevin Schaefer, Valerie Trouet, Charles Umbanhowar, John W. Williams, Zicheng Yu
CLIMATE OF THE PAST
(2017)
Article
Environmental Sciences
Rosemary T. Bush, Melissa A. Berke, Andrew D. Jacobson
ARCTIC ANTARCTIC AND ALPINE RESEARCH
(2017)
Article
Geosciences, Multidisciplinary
Florence Sylvestre, Mathieu Schuster, Hendrik Vogel, Moussa Abdheramane, Daniel Ariztegui, Ulrich Salzmann, Antje Schwalb, Nicolas Waldmann
SCIENTIFIC DRILLING
(2018)