Daniel P. Schrag
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View article: Mean ocean temperature change and decomposition of the benthic <i>δ</i> <sup>18</sup> O record over the past 4.5 million years
Mean ocean temperature change and decomposition of the benthic <i>δ</i> <sup>18</sup> O record over the past 4.5 million years Open
We use a recent reconstruction of global mean sea surface temperature change relative to preindustrial (ΔGMSST) over the last 4.5 Myr together with independent proxy-based reconstructions of bottom water (ΔBWT) or deep-ocean (ΔDOT) tempera…
View article: Mean ocean temperature change and decomposition of the benthic δ <sup>18</sup> O record over the last 4.5 Myr
Mean ocean temperature change and decomposition of the benthic δ <sup>18</sup> O record over the last 4.5 Myr Open
We use a recent compilation of global mean sea surface temperature changes (ΔGMSST) over the last 4.5 Myr together with independent proxy-based reconstructions of bottom water or deep ocean temperatures to infer changes in mean ocean tempe…
View article: Energy transition needs new materials
Energy transition needs new materials Open
The decreasing cost of electricity worldwide from wind and solar energy, as well as that of end-use technologies such as electric vehicles, reflect substantial progress made toward replacing fossil fuels with alternative energy sources. Bu…
View article: A Revisionist View of the Mid-Pleistocene Transition
A Revisionist View of the Mid-Pleistocene Transition Open
The Mid-Pleistocene Transition (MPT) is commonly characterized as a change in both temperature and ice volume from smaller amplitude, 41-kyr variability to higher amplitude, ~100-kyr variability in the absence of any significant change in …
View article: Experimental Demonstration of Alkalinity Concentration Swing for Direct Air Capture of CO<sub>2</sub>
Experimental Demonstration of Alkalinity Concentration Swing for Direct Air Capture of CO<sub>2</sub> Open
This work constitutes the first lab-scale experimental demonstration of the alkalinity concentration swing (ACS) for direct air capture (DAC) of CO2. ACS can be implemented by taking a dilute alkaline solution that has contacted ambient ai…
View article: Alkalinity Concentration Swing for Direct Air Capture of Carbon Dioxide
Alkalinity Concentration Swing for Direct Air Capture of Carbon Dioxide Open
The alkalinity concentration swing (ACS) is a new process for direct air capture of carbon dioxide driven by concentrating an alkaline solution that has been exposed to the atmosphere and loaded with dissolved inorganic carbon. Upon concen…
View article: Chemical composition of carbonate hardground cements
Chemical composition of carbonate hardground cements Open
Trace metal and isotopic ratios, including some rare earth elements, Mg/Ca, manganese and strontium concentrations, δ¹⁸O, δ¹³C, and ⁸⁷Sr/⁸⁶Sr, were analyzed in the carbonate cements from 17 Phanerozoic carbonate hardgrounds. The sensitivit…
View article: Clipperton Atoll replicated coral Sr/Ca-SST and reconstructed δ¹⁸O of seawater composite (1874-1994 CE)
Clipperton Atoll replicated coral Sr/Ca-SST and reconstructed δ¹⁸O of seawater composite (1874-1994 CE) Open
Sub-seasonally resolved and replicated coral Sr/Ca time series at Clipperton Atoll (10°18'N, 109°13'W) in the eastern Pacific are assessed as a sea surface temperature (SST) proxy in this region with small seasonal SST variability. The com…
View article: Regional Climate Variability Under Model Simulations of Solar Geoengineering
Regional Climate Variability Under Model Simulations of Solar Geoengineering Open
Solar geoengineering has been shown in modeling studies to successfully mitigate global mean surface temperature changes from greenhouse warming. Changes in land surface hydrology are complicated by the direct effect of carbon dioxide (CO …
View article: Mid-Atlantic U.S. Offshore Carbon Storage Resource Assessment
Mid-Atlantic U.S. Offshore Carbon Storage Resource Assessment Open
Attention to offshore prospects for geologic storage of carbon dioxide (CO2) in the U.S. is required to address numerous large point sources located along the U.S. Atlantic Coast. Research is underway to develop a reliable method for scree…
View article: A theory of atmospheric oxygen
A theory of atmospheric oxygen Open
Geological records of atmospheric oxygen suggest that pO 2 was less than 0.001% of present atmospheric levels ( PAL ) during the Archean, increasing abruptly to a Proterozoic value between 0.1% and 10% PAL , and rising quickly to modern le…
View article: Early extensional detachments in a contractional orogen: coherent, map-scale, submarine slides (mass transport complexes) on the outer slope of an Ediacaran collisional foredeep, eastern Kaoko belt, Namibia
Early extensional detachments in a contractional orogen: coherent, map-scale, submarine slides (mass transport complexes) on the outer slope of an Ediacaran collisional foredeep, eastern Kaoko belt, Namibia Open
The existence of coherent, large-scale, submarine landslides on modern continental margins implies that their apparent rarity in ancient orogenic belts is due to non-recognition. Two map-scale, coherent, pre-orogenic, normal-sense detachme…
View article: Neoproterozoic stratigraphy of the Zavkhan terrane of Mongolia: The backbone for Cryogenian and early Ediacaran chemostratigraphic records
Neoproterozoic stratigraphy of the Zavkhan terrane of Mongolia: The backbone for Cryogenian and early Ediacaran chemostratigraphic records Open
The Neoproterozoic Tsagaan-Olom Group is exposed in the Zavkhan Terrane of southwestern Mongolia and hosts unique geochemical, paleoclimate, and paleontological records that have become central to our understanding of this pivotal interval…
View article: Tectonostratigraphic evolution of the <em>c.</em> 780–730 Ma Beck Spring Dolomite: Basin Formation in the core of Rodinia
Tectonostratigraphic evolution of the <em>c.</em> 780–730 Ma Beck Spring Dolomite: Basin Formation in the core of Rodinia Open
The Beck Spring Dolomite is a mixed carbonate–siliciclastic succession exposed in Death Valley, California, that was deposited between 780 and 717 Ma. Along with its bounding units, the Horse Thief Springs Formation below and unit KP1 of t…