The Medium writes about Planet Texas 2050 and UT archaeologist Jay Banner’s interview about his c... more The Medium writes about Planet Texas 2050 and UT archaeologist Jay Banner’s interview about his climate report in an article published Feb. 14th, 2019.
Sedimentology and Geochemistry of Dolostones, 1988
Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK... more Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK FORMATION MISSISSIPPIAN ISOTOPIC EVIDENCE JAY L BANNER G N HANSON AND W J MEYERS ...
ABSTaACr: Marine carbonates of the Burlington-Keokuk Fm. (Miss.) of the midcontinent region have ... more ABSTaACr: Marine carbonates of the Burlington-Keokuk Fm. (Miss.) of the midcontinent region have been subject to two major episodes of regionally extensive (100,000 km 2) dolomitization. Previous studies of the cathodoluminescent petrography, Sr, C, and O ...
Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK... more Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK FORMATION MISSISSIPPIAN ISOTOPIC EVIDENCE JAY L BANNER G N HANSON AND W J MEYERS ...
Our understanding of the temporal evolution of anthropogenic impacts on streams from increasing w... more Our understanding of the temporal evolution of anthropogenic impacts on streams from increasing watershed urbanization is limited by the absence of archived, historical stream-water samples. Riparian trees that derive a large portion of their water from streams may ...
Delineating the climate processes governing precipitation variability in drought-prone Texas is c... more Delineating the climate processes governing precipitation variability in drought-prone Texas is critical for predicting and mitigating climate change effects, and requires the reconstruction of past climate beyond the instrumental record. We synthesize existing paleoclimate proxy data and climate simulations to provide an overview of climate variability in Texas during the Holocene. Conditions became progressively warmer and drier transitioning from the early to mid Holocene, culminating between 7 and 3 ka (thousand years ago), and were more variable during the late Holocene. The timing and relative magnitude of Holocene climate variability, however, is poorly constrained owing to considerable variability among the different records. To help address this, we present a new speleothem (NBJ) reconstruction from a central Texas cave that comprises the highest resolution proxy record to date, spanning the mid to late Holocene. NBJ trace-element concentrations indicate variable moisture c...
We describe the creation and develop-ment of a multidisciplinary outreach effort from the univers... more We describe the creation and develop-ment of a multidisciplinary outreach effort from the university science com-munity to the general public and K–12 teacher and student audiences. M ost university scientists recognize the importance of reaching out to explain their science to the public and the K–12 community. They enjoy explaining their discoveries to the public, and understand the importance of making clear the relevance of their research to the public and the role it can play in engaging K–12 students in considering science as a career. More recent motivation comes from agencies such as the National Science Foundation, which now requires a "Broader Impacts" component in each research proposal that they consider for funding. In spite of these driving factors, public and K–12 outreach are often relegated to a low priority at uni-versities because they are generally not among the factors that are considered for promotion and tenure, nor are they part of the academic cult...
Spatial and temporal variability in the geochemistry of vadose groundwaters from caves within the... more Spatial and temporal variability in the geochemistry of vadose groundwaters from caves within the Edwards aquifer region of central Texas offers new insights into controls on vadose groundwater evolution, the relationship between vadose and phreatic groundwaters, and the fundamental influence of soil composition on groundwater geochemistry. Mass-balance modeling combined with geochemical variations in Sr isotopes and trace elements (Mg/Ca and Sr/Ca ratios) suggests that variations in fluid compositions are predominantly controlled by groundwater residence times, and the balance of water-rock interaction with overlying soils and host aquifer carbonate rocks. Consistent differences in dripwater geochemistry between individual caves are similar to compositional differences in soils above the caves. While these differences appear to exert significant control on local fluid evolution, geochemical and isotopic variations suggest that the controlling processes are regionally extensive. Tem...
Carbon isotopes in speleothems can vary in response to a number of complex processes active in ca... more Carbon isotopes in speleothems can vary in response to a number of complex processes active in cave systems that are both directly and indirectly related to climate. Progressing downward from the soil zone overlying the cave, these processes include soil respiration, fluid–rock interaction in the host limestone, degassing of CO 2 and precipitation of calcite upflow from the speleothem drip site, and calcite precipitation at the drip site. Here we develop a new approach to independently constrain the roles of water–rock interaction and soil processes in controlling stalagmite d 13 C. This approach uses the dead carbon pro-portion (dcp) estimated from coupled 14 C and 230 Th/U measurements, in conjunction with Sr isotope analyses on stalagmite calcite from a central Sierra Nevada foothills cave in California, a region characterized by a highly seasonal Mediterranean-type climate, to determine the roles of water–rock interaction and soil processes in determining stalagmite d 13 C. Incr...
The Medium writes about Planet Texas 2050 and UT archaeologist Jay Banner’s interview about his c... more The Medium writes about Planet Texas 2050 and UT archaeologist Jay Banner’s interview about his climate report in an article published Feb. 14th, 2019.
Sedimentology and Geochemistry of Dolostones, 1988
Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK... more Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK FORMATION MISSISSIPPIAN ISOTOPIC EVIDENCE JAY L BANNER G N HANSON AND W J MEYERS ...
ABSTaACr: Marine carbonates of the Burlington-Keokuk Fm. (Miss.) of the midcontinent region have ... more ABSTaACr: Marine carbonates of the Burlington-Keokuk Fm. (Miss.) of the midcontinent region have been subject to two major episodes of regionally extensive (100,000 km 2) dolomitization. Previous studies of the cathodoluminescent petrography, Sr, C, and O ...
Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK... more Page 1. WATER ROCK INTERACTION HISTORY OF REGIONALLY EXTENSIVE DOLOMITES OF THE BURLINGTON KEOKUK FORMATION MISSISSIPPIAN ISOTOPIC EVIDENCE JAY L BANNER G N HANSON AND W J MEYERS ...
Our understanding of the temporal evolution of anthropogenic impacts on streams from increasing w... more Our understanding of the temporal evolution of anthropogenic impacts on streams from increasing watershed urbanization is limited by the absence of archived, historical stream-water samples. Riparian trees that derive a large portion of their water from streams may ...
Delineating the climate processes governing precipitation variability in drought-prone Texas is c... more Delineating the climate processes governing precipitation variability in drought-prone Texas is critical for predicting and mitigating climate change effects, and requires the reconstruction of past climate beyond the instrumental record. We synthesize existing paleoclimate proxy data and climate simulations to provide an overview of climate variability in Texas during the Holocene. Conditions became progressively warmer and drier transitioning from the early to mid Holocene, culminating between 7 and 3 ka (thousand years ago), and were more variable during the late Holocene. The timing and relative magnitude of Holocene climate variability, however, is poorly constrained owing to considerable variability among the different records. To help address this, we present a new speleothem (NBJ) reconstruction from a central Texas cave that comprises the highest resolution proxy record to date, spanning the mid to late Holocene. NBJ trace-element concentrations indicate variable moisture c...
We describe the creation and develop-ment of a multidisciplinary outreach effort from the univers... more We describe the creation and develop-ment of a multidisciplinary outreach effort from the university science com-munity to the general public and K–12 teacher and student audiences. M ost university scientists recognize the importance of reaching out to explain their science to the public and the K–12 community. They enjoy explaining their discoveries to the public, and understand the importance of making clear the relevance of their research to the public and the role it can play in engaging K–12 students in considering science as a career. More recent motivation comes from agencies such as the National Science Foundation, which now requires a "Broader Impacts" component in each research proposal that they consider for funding. In spite of these driving factors, public and K–12 outreach are often relegated to a low priority at uni-versities because they are generally not among the factors that are considered for promotion and tenure, nor are they part of the academic cult...
Spatial and temporal variability in the geochemistry of vadose groundwaters from caves within the... more Spatial and temporal variability in the geochemistry of vadose groundwaters from caves within the Edwards aquifer region of central Texas offers new insights into controls on vadose groundwater evolution, the relationship between vadose and phreatic groundwaters, and the fundamental influence of soil composition on groundwater geochemistry. Mass-balance modeling combined with geochemical variations in Sr isotopes and trace elements (Mg/Ca and Sr/Ca ratios) suggests that variations in fluid compositions are predominantly controlled by groundwater residence times, and the balance of water-rock interaction with overlying soils and host aquifer carbonate rocks. Consistent differences in dripwater geochemistry between individual caves are similar to compositional differences in soils above the caves. While these differences appear to exert significant control on local fluid evolution, geochemical and isotopic variations suggest that the controlling processes are regionally extensive. Tem...
Carbon isotopes in speleothems can vary in response to a number of complex processes active in ca... more Carbon isotopes in speleothems can vary in response to a number of complex processes active in cave systems that are both directly and indirectly related to climate. Progressing downward from the soil zone overlying the cave, these processes include soil respiration, fluid–rock interaction in the host limestone, degassing of CO 2 and precipitation of calcite upflow from the speleothem drip site, and calcite precipitation at the drip site. Here we develop a new approach to independently constrain the roles of water–rock interaction and soil processes in controlling stalagmite d 13 C. This approach uses the dead carbon pro-portion (dcp) estimated from coupled 14 C and 230 Th/U measurements, in conjunction with Sr isotope analyses on stalagmite calcite from a central Sierra Nevada foothills cave in California, a region characterized by a highly seasonal Mediterranean-type climate, to determine the roles of water–rock interaction and soil processes in determining stalagmite d 13 C. Incr...
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