Proc Natl Acad Sci U S A 2002 Dec 2;99(25):15852-4. Epub 2002 Dec 2.
Department of Geology, University of California, Davis, CA 95616, USA.
Science 2021 03;371(6536):1346-1350
Department of Earth Sciences and Planetary Sciences, University of California Riverside, Riverside, CA 92521, USA.
Changes in the concentration and isotopic composition of the major constituents in seawater reflect changes in their sources and sinks. Because many of the processes controlling these sources and sinks are tied to the cycling of carbon, such records can provide insights into what drives past changes in atmospheric carbon dioxide and climate. Here, we present a stable strontium (Sr) isotope record derived from pelagic marine barite. Read More
Nat Commun 2021 Mar 17;12(1):1712. Epub 2021 Mar 17.
Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA.
The stable forms of carbon in Earth's deep interior control storage and fluxes of carbon through the planet over geologic time, impacting the surface climate as well as carrying records of geologic processes in the form of diamond inclusions. However, current estimates of the distribution of carbon in Earth's mantle are uncertain, due in part to limited understanding of the fate of carbonates through subduction, the main mechanism that transports carbon from Earth's surface to its interior. Oxidized carbon carried by subduction has been found to reside in MgCO throughout much of the mantle. Read More
Proc Natl Acad Sci U S A 2021 Feb;118(6)
Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
The spatial coverage and temporal resolution of the Early Paleozoic paleoclimate record are limited, primarily due to the paucity of well-preserved skeletal material commonly used for oxygen-isotope paleothermometry. Bulk-rock [Formula: see text] datasets can provide broader coverage and higher resolution, but are prone to burial alteration. We assess the diagenetic character of two thick Cambro-Ordovician carbonate platforms with minimal to moderate burial by pairing clumped and bulk isotope analyses of micritic carbonates. Read More
Sci Total Environ 2021 May 29;768:144352. Epub 2020 Dec 29.
Group of Aquatic Macrophytes Ecology, Centre d'Estudis Avançats de Blanes (CEAB-CSIC), 17300 Blanes, Girona, Spain; Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup, WA, Australia.
Seagrasses are distributed all along the coast of the Mediterranean Sea being Posidonia oceanica and Cymodocea nodosa the most common species. They promote sedimentation, leading to the formation of well-structured soils. Over the last decade, a growing attention has been paid to their role as CO sinks in the form of organic carbon (C) and to their use as environmental archives. Read More
Sci Rep 2021 Jan 12;11(1):662. Epub 2021 Jan 12.
Environmental Studies Program, Department of Geography, University of Oregon, Eugene, 97403, USA.
The drying power of air, or vapour pressure deficit (VPD), is an important measurement of potential plant stress and productivity. Estimates of VPD values of the past are integral for understanding the link between rising modern atmospheric carbon dioxide (pCO) and global water balance. A geological record of VPD is needed for paleoclimate studies of past greenhouse spikes which attempt to constrain future climate, but at present there are few quantitative atmospheric moisture proxies that can be applied to fossil material. Read More