Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Alexandra V. Turchyn"'
Autor:
Gabrielle E. Kleber, Leonard Magerl, Alexandra V. Turchyn, Kelly Redeker, Stefan Thiele, Martin Liira, Koit Herodes, Lise Øvreås, Andrew Hodson
Publikováno v:
Frontiers in Earth Science, Vol 12 (2024)
Glacial groundwater can mobilize deep-seated methane from beneath glaciers and permafrost in the Arctic, leading to atmospheric emissions of this greenhouse gas. We present a temporal, hydro-chemical dataset of methane-rich groundwater collected duri
Externí odkaz:
https://doaj.org/article/92dae62744bd4ed18009edc19c40915e
Publikováno v:
Frontiers in Marine Science, Vol 9 (2023)
Bioturbation enhances mixing between the seafloor and overlying ocean due to changes the redox state of the sediment and influences the biogeochemical cycling of redox-sensitive elements such as sulfur. Before the widespread appearance of burrowing f
Externí odkaz:
https://doaj.org/article/fc2743b090e44b4eba0034e4f70a4116
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Identification of stratospheric volcanic eruptions in the geological record and their link to mass extinction events during the past 540 million years remains challenging. Here, the authors report unexpected, large mass-independent sulphur isotopic c
Externí odkaz:
https://doaj.org/article/44c21b79238c466c976ab9e26c386f92
Autor:
Daniel H. James, Harold J. Bradbury, Gilad Antler, Zvi Steiner, Alec M. Hutchings, Xiaole Sun, Raoul Saar, Mervyn Greaves, Alexandra V. Turchyn
Publikováno v:
Frontiers in Earth Science, Vol 9 (2021)
We present pore fluid geochemistry, including major ion and trace metal concentrations and the isotopic composition of pore fluid calcium and sulfate, from the uppermost meter of sediments from the Gulf of Aqaba (Northeast Red Sea) and the Iberian Ma
Externí odkaz:
https://doaj.org/article/b97758837a8c4d878017a6eac6712dbb
Autor:
Harold J. Bradbury, Alexandra V. Turchyn, Adam Bateson, Gilad Antler, Angus Fotherby, Jennifer L. Druhan, Mervyn Greaves, Duygu S. Sevilgen, David A. Hodell
Publikováno v:
Frontiers in Earth Science, Vol 9 (2021)
Here we present the carbon isotopic composition of dissolved inorganic carbon (DIC) and the sulfur isotopic composition of sulfate, along with changes in sulfate concentrations, of the pore fluid collected from a series of sediment cores located alon
Externí odkaz:
https://doaj.org/article/3edfeda10a944bc78096a817b135f888
Publikováno v:
Frontiers in Earth Science, Vol 9 (2021)
The vast majority of carbonate minerals in modern marine sediments are biogenic, derived from the skeletal remains of organisms living in the ocean. However, carbonate minerals can also precipitate abiotically within marine sediments, and this carbon
Externí odkaz:
https://doaj.org/article/1670328509024c4a8a139908cdbb836f
Autor:
Angus Fotherby, Harold J. Bradbury, Gilad Antler, Xiaole Sun, Jennifer L. Druhan, Alexandra V. Turchyn
Publikováno v:
Frontiers in Earth Science, Vol 8 (2021)
We present the results of an isotope-enabled reactive transport model of a sediment column undergoing active microbial sulfate reduction to explore the response of the sulfur and oxygen isotopic composition of sulfate under perturbations to steady st
Externí odkaz:
https://doaj.org/article/b1395c4b26194e978d42a403fd789b5a
Autor:
Andrea M. Erhardt, Alexandra V. Turchyn, J. A. D. Dickson, Aleksey Y. Sadekov, Paul D. Taylor, Mark A. Wilson, Peter Scott, Daniel P. Schrag
Publikováno v:
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 3, Pp n/a-n/a (2020)
Abstract In this study, we report the chemical composition of early carbonate cement precipitates in carbonate hardgrounds to understand the geochemical signature of near‐surface carbonate mineral precipitation. As carbonate hardgrounds lithify at
Externí odkaz:
https://doaj.org/article/80c58630d6c0414ea14a542f90f8f31d
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-8 (2018)
Ocean acidification and warming threaten coral reefs globally. Here, the authors show that the net contribution of corals to the CaCO3 budget of the tropical Red Sea declined dramatically between 1998 and 2015 and remained low between 2015 and 2018.
Externí odkaz:
https://doaj.org/article/6ed2bb3300b142f79d40efe90c221dd9
Publikováno v:
Frontiers in Earth Science, Vol 7 (2019)
We explore the dynamics of the subsurface sulfur, iron and carbon cycles in salt marsh sediments from East Anglia, United Kingdom. We report measurements of pore fluid and sediment geochemistry, coupled with results from laboratory sediment incubatio
Externí odkaz:
https://doaj.org/article/b4239b6be93540f28a2533b2269fe9b4