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Dr Jotis Baronas' Outputs (18)

The impact of adsorption–desorption reactions on the chemistry of Himalayan rivers and the quantification of silicate weathering rates (2024)
Journal Article
Knight, A. C., Stevenson, E. I., Bridgestock, L., Jotautas Baronas, J., Knapp, W. J., Adhikari, B. R., Andermann, C., & Tipper, E. T. (2024). The impact of adsorption–desorption reactions on the chemistry of Himalayan rivers and the quantification of silicate weathering rates. Earth and Planetary Science Letters, 641, Article 118814. https://doi.org/10.1016/j.epsl.2024.118814

High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain (2023)
Journal Article
Dellinger, M., Hilton, R. G., Baronas, J. J., Torres, M. A., Burt, E. I., Clark, K. E., …West, A. J. (2023). High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain. Proceedings of the National Academy of Sciences, 120(39), Article e2306343120. https://doi.org/10.1073/pnas.2306343120

The oxidation of organic carbon contained within sedimentary rocks (“petrogenic” carbon, or hereafter OCpetro) emits nearly as much CO2 as is released by volcanism, thereby playing a key role in the long-term global C budget. High erosion rates in mo... Read More about High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain.

Dissolved trace element concentrations and fluxes in the Irrawaddy, Salween, Sittaung and Kaladan Rivers (2022)
Journal Article
Bridgestock, L., Henderson, G. M., Holdship, P., Khaing, A. M., Naing, T. T., Myint, T. A., …Bickle, M. (2022). Dissolved trace element concentrations and fluxes in the Irrawaddy, Salween, Sittaung and Kaladan Rivers. Science of the Total Environment, 841, Article 156756. https://doi.org/10.1016/j.scitotenv.2022.156756

The Irrawaddy (Ayeyarwaddy) and Salween (Thanlwin) globally rank among the largest rivers for supplying dissolved and particulate material to the ocean. Along with the Sittaung and Kaladan rivers they have societal importance to Myanmar in terms wate... Read More about Dissolved trace element concentrations and fluxes in the Irrawaddy, Salween, Sittaung and Kaladan Rivers.

Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris (2022)
Journal Article
Schwab, M. S., Hilton, R. G., Haghipour, N., Baronas, J. J., & Eglinton, T. I. (2022). Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris. Journal of Geophysical Research: Biogeosciences, 127(3), Article e2021JG006726. https://doi.org/10.1029/2021jg006726

Much attention has been focused on fine-grained sediments carried as suspended load in rivers due to their potential to transport, disperse, and preserve organic carbon (OC), while the transfer and fate of OC associated with coarser-grained sediments... Read More about Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris.

Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes (2021)
Journal Article
Larkin, C. S., Piotrowski, A. M., Hindshaw, R. S., Bayon, G., Hilton, R. G., Baronas, J. J., …Tipper, E. T. (2021). Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes. Earth and Planetary Science Letters, 565, Article 116933. https://doi.org/10.1016/j.epsl.2021.116933

Riverine suspended particulate matter (SPM) is essential for the delivery of micronutrients such as iron (Fe) to the oceans. SPM is known to consist of multiple phases with differing reactivity, but their role in the delivery of elements to the ocean... Read More about Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes.

Freshwater monitoring by nanopore sequencing (2021)
Journal Article
Urban, L., Holzer, A., Baronas, J. J., Hall, M. B., Braeuninger-Weimer, P., Scherm, M. J., …Stammnitz, M. R. (2021). Freshwater monitoring by nanopore sequencing. eLife, 10, https://doi.org/10.7554/elife.61504

While traditional microbiological freshwater tests focus on the detection of specific bacterial indicator species, including pathogens, direct tracing of all aquatic DNA through metagenomics poses a profound alternative. Yet, in situ metagenomic wate... Read More about Freshwater monitoring by nanopore sequencing.

Modulation of Riverine Concentration‐Discharge Relationships by Changes in the Shape of the Water Transit Time Distribution (2021)
Journal Article
Torres, M. A., & Baronas, J. J. (2021). Modulation of Riverine Concentration‐Discharge Relationships by Changes in the Shape of the Water Transit Time Distribution. Global Biogeochemical Cycles, 35(1), Article e2020GB006694. https://doi.org/10.1029/2020gb006694

The concentrations of weathering-derived solutes in rivers and their covariance with discharge are thought to reflect reactive-transport processes in hillslopes and to reveal the sensitivity of solute fluxes to climatic change. It is expected that di... Read More about Modulation of Riverine Concentration‐Discharge Relationships by Changes in the Shape of the Water Transit Time Distribution.

Global silicate weathering flux overestimated because of sediment–water cation exchange (2020)
Journal Article
Tipper, E. T., Stevenson, E. I., Alcock, V., Knight, A. C. G., Baronas, J. J., Hilton, R. G., …Hughes, G. (2021). Global silicate weathering flux overestimated because of sediment–water cation exchange. Proceedings of the National Academy of Sciences, 118(1), Article e2016430118. https://doi.org/10.1073/pnas.2016430118

Large rivers transport water and sediment to floodplains and oceans, supplying the nutrients that sustain life. They also transport carbon, removed from the atmosphere during mineral dissolution reactions, which is thought to provide a key negative c... Read More about Global silicate weathering flux overestimated because of sediment–water cation exchange.

Ge and Si isotope behavior during intense tropical weathering and ecosystem cycling (2020)
Journal Article
Baronas, J. J., West, A. J., Burton, K. W., Hammond, D. E., Opfergelt, S., Pogge von Strandmann, P. A., …Rouxel, O. J. (2020). Ge and Si isotope behavior during intense tropical weathering and ecosystem cycling. Global Biogeochemical Cycles, 34(8), Article e2019GB006522. https://doi.org/10.1029/2019gb006522

Chemical weathering of volcanic rocks in warm and humid climates contributes disproportionately to global solute fluxes. Geochemical signatures of solutes and solids formed during this process can help quantify and reconstruct weathering intensity in... Read More about Ge and Si isotope behavior during intense tropical weathering and ecosystem cycling.

A First Look at Dissolved Ge Isotopes in Marine Sediments (2019)
Journal Article
Baronas, J. J., Hammond, D. E., Rouxel, O. J., & Monteverde, D. R. (2019). A First Look at Dissolved Ge Isotopes in Marine Sediments. Frontiers in Earth Science, 7, Article 162. https://doi.org/10.3389/feart.2019.00162

The removal of chemical species from seawater during the precipitation of authigenic minerals is difficult to constrain but may play a major role in the global biogeochemical cycles of some elements, including silicon (Si) and germanium (Ge). Here, w... Read More about A First Look at Dissolved Ge Isotopes in Marine Sediments.

Ge and Si isotope signatures in rivers: A quantitative multi-proxy approach (2018)
Journal Article
Baronas, J. J., Torres, M. A., West, A. J., Rouxel, O., Georg, B., Bouchez, J., …Hammond, D. E. (2018). Ge and Si isotope signatures in rivers: A quantitative multi-proxy approach. Earth and Planetary Science Letters, 503, 194-215. https://doi.org/10.1016/j.epsl.2018.09.022

Solutes derived from the dissolution of silicate minerals play a key role in Earth's climate via the carbon and other biogeochemical cycles. Silicon (Si) is a unique constituent of silicate minerals and a biologically important nutrient, so tracing i... Read More about Ge and Si isotope signatures in rivers: A quantitative multi-proxy approach.

Distribution of Extracellular Flavins in a Coastal Marine Basin and Their Relationship to Redox Gradients and Microbial Community Members (2018)
Journal Article
Monteverde, D. R., Sylvan, J. B., Suffridge, C., Baronas, J. J., Fichot, E., Fuhrman, J., …Sañudo-Wilhelmy, S. A. (2018). Distribution of Extracellular Flavins in a Coastal Marine Basin and Their Relationship to Redox Gradients and Microbial Community Members. Environmental Science and Technology, 52(21), 12265-12274. https://doi.org/10.1021/acs.est.8b02822

The flavins (including flavin mononucleotide (FMN) and riboflavin (RF)) are a class of organic compounds synthesized by organisms to assist in critical redox reactions. While known to be secreted extracellularly by some species in laboratory-based cu... Read More about Distribution of Extracellular Flavins in a Coastal Marine Basin and Their Relationship to Redox Gradients and Microbial Community Members.

Mixing as a driver of temporal variations in river hydrochemistry: 2. Major and trace element concentration dynamics in the Andes‐Amazon transition (2017)
Journal Article
Baronas, J. J., Torres, M. A., Clark, K. E., & West, A. J. (2017). Mixing as a driver of temporal variations in river hydrochemistry: 2. Major and trace element concentration dynamics in the Andes‐Amazon transition. Water Resources Research, 53(4), 3120-3145. https://doi.org/10.1002/2016wr019729

Variations in riverine solute chemistry with changing runoff are used to interrogate catchment hydrology and to investigate chemical reactions in Earth's critical zone. This approach requires some understanding of how spatial and temporal averaging o... Read More about Mixing as a driver of temporal variations in river hydrochemistry: 2. Major and trace element concentration dynamics in the Andes‐Amazon transition.

Mixing as a driver of temporal variations in river hydrochemistry: 1. Insights from conservative tracers in the Andes‐Amazon transition (2017)
Journal Article
Torres, M. A., Baronas, J. J., Clark, K. E., Feakins, S. J., & West, A. J. (2017). Mixing as a driver of temporal variations in river hydrochemistry: 1. Insights from conservative tracers in the Andes‐Amazon transition. Water Resources Research, 53(4), 3102-3119. https://doi.org/10.1002/2016wr019733

The response of hillslope processes to changes in precipitation may drive the observed changes in the solute geochemistry of rivers with discharge. This conjecture is most robust when variations in the key environmental factors that affect hillslope... Read More about Mixing as a driver of temporal variations in river hydrochemistry: 1. Insights from conservative tracers in the Andes‐Amazon transition.

A global Ge isotope budget (2017)
Journal Article
Baronas, J. J., Hammond, D. E., McManus, J., Wheat, C. G., & Siebert, C. (2017). A global Ge isotope budget. Geochimica et Cosmochimica Acta, 203, 265-283. https://doi.org/10.1016/j.gca.2017.01.008

We present measurements of Ge isotope composition and ancillary data for samples of river water, low- and high-temperature hydrothermal fluids, and seawater. The dissolved δ74Ge composition of analyzed rivers ranges from 2.0 to 5.6‰, which is signifi... Read More about A global Ge isotope budget.

Germanium–silicon fractionation in a river-influenced continental margin: The Northern Gulf of Mexico (2016)
Journal Article
Baronas, J. J., Hammond, D. E., Berelson, W. M., McManus, J., & Severmann, S. (2016). Germanium–silicon fractionation in a river-influenced continental margin: The Northern Gulf of Mexico. Geochimica et Cosmochimica Acta, 178, 124-142. https://doi.org/10.1016/j.gca.2016.01.028

In this study we have sampled the water column and sediments of the Gulf of Mexico to investigate the effects of high riverine terrigenous load and sediment redox conditions on the cycling of Ge and Si. Water column Ge/Si ratios across the Gulf of Me... Read More about Germanium–silicon fractionation in a river-influenced continental margin: The Northern Gulf of Mexico.