Jocelyn C Turnbull
Biographic Data
| ID | 5590862 |
|---|---|
| NAME | Jocelyn C Turnbull |
| GIVEN NAMES | Jocelyn C |
| FAMILY NAME | Turnbull |
| SIGNATURE | TURNBULL J C |
| AFFILIATIONS | GNS Science |
| ORCID | 0000-0002-0306-9658 |
| VERIFIED | Yes |
| TOTAL WORKS | 23 |
| TOTAL CITATIONS | 80 |
| AUTHOR COUNT | 23 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2004 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 4 |
Detection of local-scale changes in greenhouse gas emissions in urban environments using micrometeorological methods and comparison to a high-resolution inventory
We used the Monin–Obukhov similarity theory (MOST) flux-variance relationship to estimate greenhouse gas (GHG) fluxes from high-precision mole fraction measurements at 3 instrumented urban communication towers over several years, demonstrating the ability of this method to detect and quantify changes in emissions. Depending on data availability, we used carbon dioxide (CO2) and carbon monoxide (CO) measurements and/or tracer ratios to estimate fl…
Advancing Antarctic Sediment Chronology Through Combined Ramped Pyrolysis Oxidation and Pyrolysis-Gc-MS
Radiocarbon ( 14 C) dating of sediment deposition around Antarctica is often challenging due to heterogeneity in sources and ages of organic carbon in the sediment. Chemical and thermochemical techniques have been used to separate organic carbon when microfossils are not present. These techniques generally improve on bulk sediment dates, but they necessitate assumptions about the age spectra of specific molecules or compound classes and about the…
Comprehensive Update of Marine Reservoir Values for New Zealand Coastal Waters to Inform Coastal Hazard Research
Marine radiocarbon ( 14 C) ages are an important geochronology tool for the understanding of past earthquakes and tsunamis that have impacted the coastline of New Zealand. To advance this field of research, we need an improved understanding of the radiocarbon marine reservoir correction for coastal waters of New Zealand. Here we report 170 new ΔR 20 (1900–1950) measurements from around New Zealand made on pre-1950 marine shells and mollusks kille…
Source decomposition of eddy-covariance CO 2 flux measurements for evaluating a high-resolution urban CO 2 emissions inventory
We present the comparison of source-partitioned CO 2 flux measurements with a high-resolution urban CO 2 emissions inventory (Hestia). Tower-based measurements of CO and 14 C are used to partition net CO 2 flux measurements into fossil and biogenic components. A flux footprint model is used to quantify spatial variation in flux measurements. We compare the daily cycle and spatial structure of Hestia and eddy-covariance derived fossil fuel CO 2 em…
Radiocarbon and Atmospheric 14 Co 2 Pioneer Athol Rafter
Direct atmospheric 14 CO 2 measurements began in New Zealand in 1954, initially to improve 14 C as a dating tool, but quickly evolving into a method for understanding the carbon cycle. These early 14 CO 2 measurements immediately demonstrated the existence of an “Atom Bomb Effect,” as well as an “Industrial Effect.” These two gigantic tracer experiments have been utilized via 14 CO 2 measurements over the years to produce a wealth of knowledge in…
Atmospheric Radiocarbon for the Period 1950–2019
This paper presents a compilation of atmospheric radiocarbon for the period 1950–2019, derived from atmospheric CO 2 sampling and tree rings from clean-air sites. Following the approach taken by Hua et al. (2013), our revised and extended compilation consists of zonal, hemispheric and global radiocarbon ( 14 C) data sets, with monthly data sets for 5 zones (Northern Hemisphere zones 1, 2, and 3, and Southern Hemisphere zones 3 and 1–2). Our new c…
Pretreatment of Terrestrial Macrofossils
Acid-alkali-acid (AAA) pretreatment is widely used to clean terrestrial plant macrofossil samples for radiocarbon ( 14 C) dating. There is wide variation amongst laboratories in the AAA method details and less rigorous AAA pretreatment is often used on fragile or small samples. Yet there is little evidence as to the efficacy of the different methods and whether the use of less rigorous methods is justified. We investigated four variations of AAA …
Investigations into the use of multi-species measurements for source apportionment of the Indianapolis fossil fuel CO 2 signal
Current bottom up estimates of CO2 emission fluxes are based on a mixture of direct and indirect flux estimates relying to varying degrees on regulatory or self-reported data. Hence, it is important to use additional, independent information to assess biases and lower the flux uncertainty. We explore the use of a self-organizing map (SOM) as a tool to use multi-species observations to partition fossil fuel CO2 (CO2ff) emissions by economic source…
Seashore Settlement Patterns in the Koné and Naïa Periods
As part of a geological survey in southwest mainland New Caledonia, potsherds were recorded in the profiles at four coastal sites. Subsequent archaeological investigations at two of these sites have allowed us to diversify the ceramic data and show them to be local variants of Podtanean, Puen, and Plum ceramic types. These are characteristic of production in the southern part of the archipelago during the first millennium BC and first millennium …
Tower measurement network of in-situ CO2, CH4, and CO in support of the Indianapolis FLUX (INFLUX) Experiment
A twelve-station tower-based observation network measuring CO2, CH4, and CO was deployed in and around the Indianapolis, IN metropolitan area as part of the Indianapolis Flux Experiment (INFLUX). Measurements began in 2010 and the full network was deployed by 2013. Observations were made at heights ranging from 39 to 136 m above ground level using existing communication towers. Several towers in the network had multiple measurement levels. Cavity…
The Indianapolis Flux Experiment (INFLUX)
The objective of the Indianapolis Flux Experiment (INFLUX) is to develop, evaluate and improve methods for measuring greenhouse gas (GHG) emissions from cities. INFLUX’s scientific objectives are to quantify CO2 and CH4 emission rates at 1 km2 resolution with a 10% or better accuracy and precision, to determine whole-city emissions with similar skill, and to achieve high (weekly or finer) temporal resolution at both spatial resolutions. The exper…
Reconciling the differences between a bottom-up and inverse-estimated FFCO2 emissions estimate in a large US urban area
The INFLUX experiment has taken multiple approaches to estimate the carbon dioxide (CO2) flux in a domain centered on the city of Indianapolis, Indiana. One approach, Hestia, uses a bottom-up technique relying on a mixture of activity data, fuel statistics, direct flux measurement and modeling algorithms. A second uses a Bayesian atmospheric inverse approach constrained by atmospheric CO2 measurements and the Hestia emissions estimate as a prior …
Assessing the optimized precision of the aircraft mass balance method for measurement of urban greenhouse gas emission rates through averaging
To effectively address climate change, aggressive mitigation policies need to be implemented to reduce greenhouse gas emissions. Anthropogenic carbon emissions are mostly generated from urban environments, where human activities are spatially concentrated. Improvements in uncertainty determinations and precision of measurement techniques are critical to permit accurate and precise tracking of emissions changes relative to the reduction targets. A…
Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source
We present measurements of CO mole fraction and CO stable isotopes (δ13CO and δC18O) in air during the winters of 2013–14 and 2014–15 at tall tower sampling sites in and around Indianapolis, USA. A tower located upwind of the city was used to quantitatively remove the background CO signal, allowing for the first unambiguous isotopic characterization of the urban CO source and yielding 13CO of –27.7 ± 0.5‰ VPDB and C18O of 17.7 ± 1.1‰ VSMOW for th…
Quantification of urban atmospheric boundary layer greenhouse gas dry mole fraction enhancements in the dormant season
We assess the detectability of city emissions via a tower-based greenhouse gas (GHG) network, as part of the Indianapolis Flux (INFLUX) experiment. By examining afternoon-averaged results from a network of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fraction measurements in Indianapolis, Indiana for 2011–2013, we quantify spatial and temporal patterns in urban atmospheric GHG dry mole fractions. The platform for these measu…
The Earliest Shell Fishhooks From the Americas Reveal Fishing Technology of Pleistocene Maritime Foragers
While the North American archaeological record signals the presence of early humans along the northeastern Pacific coast by the Late Pleistocene, we know little about the technological systems employed by these coastally oriented colonizing groups. We here report the discovery of the earliest unequivocal evidence for the use and manufacture of shell fishhooks in the western hemisphere. Four single-piece shell fishhooks dating to the terminal Plei…
Quantification and source apportionment of the methane emission flux from the city of Indianapolis
We report the CH4 emission flux from the city of Indianapolis, IN, the site of the Indianapolis Flux Experiment (INFLUX) project for developing, assessing, and improving top-down and bottom-up approaches for quantifying urban greenhouse gas emissions. Using an aircraft-based mass balance approach, we find that the average CH4 emission rate from five flight experiments in 2011 is 135 ± 58 (1σ) moles s-1 (7800 ± 3300 kg hr-1). The effective per cap…
High-Precision Atmospheric 14 CO 2 Measurement at the Rafter Radiocarbon Laboratory
This article describes a new capability for high-precision 14 C measurement of CO 2 from air at the Rafter Radiocarbon Laboratory, GNS Science, New Zealand. We evaluate the short-term within-wheel repeatability and long-term between-wheel repeatability from measurements of multiple aliquots of control materials sourced from whole air. Samples are typically measured to 650,000 14 C counts, providing a nominal accelerator mass spectrometry (AMS) st…
Allocation of Terrestrial Carbon Sources Using 14 CO 2
The radiocarbon content of whole air provides a theoretically ideal and now observationally proven tracer for recently added fossil-fuel-derived CO 2 in the atmosphere ( C ff ). Over large industrialized land areas, determination of C ff also constrains the change in CO 2 due to uptake and release by the terrestrial biosphere. Here, we review the development of a Δ 14 CO 2 measurement program and its implementation within the US portion of the NO…
Refining the Chronology of the Agate Basin Complex
The Frazier site (5WL268) has been interpreted as a single component bison kill and processing site representative of the Paleoindian Agate Basin complex in northeastern Colorado. The site was excavated in the 1960s by H. Marie Wormington. An examination of six accelerator mass spectrometry 14C radiocarbon dates recently obtained on bison bone (amino acids) and charcoal collected during Wormington’s investigations suggest the Frazier site dates b…
A New Automated Extraction System for 14 C Measurement for Atmospheric Co 2
The radiocarbon content of atmospheric CO 2 (Δ 14 CO 2 ) has long been of interest to atmospheric and Earth system researchers. Recent improvements in 14 C measurement precision and reduction in sample size requirements have now made it possible to measure Δ 14 CO 2 within existing trace gas sampling networks, most notably as a method to quantify recently added fossil-fuel-derived CO 2 in the atmosphere. At INSTAAR, in collaboration with NOAA/ESR…
Marine-derived 14C calibration and activity record for the past 50,000 years updated from the Cariaco Basin
C Activity and Global Carbon Cycle Changes over the Past 50,000 Years
A series of 14 C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14 C …
Atmospheric Radiocarbon for the Period 1950–2019
This paper presents a compilation of atmospheric radiocarbon for the period 1950–2019, derived from atmospheric CO 2 sampling and tree rings from clean-air sites. Following the approach taken by Hua et al. (2013), our revised and extended compilation consists of zonal, hemispheric and global radiocarbon ( 14 C) data sets, with monthly data sets for 5 zones (Northern Hemisphere zones 1, 2, and 3, and Southern Hemisphere zones 3 and 1–2). Our new c…
The Earliest Shell Fishhooks From the Americas Reveal Fishing Technology of Pleistocene Maritime Foragers
While the North American archaeological record signals the presence of early humans along the northeastern Pacific coast by the Late Pleistocene, we know little about the technological systems employed by these coastally oriented colonizing groups. We here report the discovery of the earliest unequivocal evidence for the use and manufacture of shell fishhooks in the western hemisphere. Four single-piece shell fishhooks dating to the terminal Plei…
High-Precision Atmospheric 14 CO 2 Measurement at the Rafter Radiocarbon Laboratory
This article describes a new capability for high-precision 14 C measurement of CO 2 from air at the Rafter Radiocarbon Laboratory, GNS Science, New Zealand. We evaluate the short-term within-wheel repeatability and long-term between-wheel repeatability from measurements of multiple aliquots of control materials sourced from whole air. Samples are typically measured to 650,000 14 C counts, providing a nominal accelerator mass spectrometry (AMS) st…
Refining the Chronology of the Agate Basin Complex
The Frazier site (5WL268) has been interpreted as a single component bison kill and processing site representative of the Paleoindian Agate Basin complex in northeastern Colorado. The site was excavated in the 1960s by H. Marie Wormington. An examination of six accelerator mass spectrometry 14C radiocarbon dates recently obtained on bison bone (amino acids) and charcoal collected during Wormington’s investigations suggest the Frazier site dates b…
A New Automated Extraction System for 14 C Measurement for Atmospheric Co 2
The radiocarbon content of atmospheric CO 2 (Δ 14 CO 2 ) has long been of interest to atmospheric and Earth system researchers. Recent improvements in 14 C measurement precision and reduction in sample size requirements have now made it possible to measure Δ 14 CO 2 within existing trace gas sampling networks, most notably as a method to quantify recently added fossil-fuel-derived CO 2 in the atmosphere. At INSTAAR, in collaboration with NOAA/ESR…
Pretreatment of Terrestrial Macrofossils
Acid-alkali-acid (AAA) pretreatment is widely used to clean terrestrial plant macrofossil samples for radiocarbon ( 14 C) dating. There is wide variation amongst laboratories in the AAA method details and less rigorous AAA pretreatment is often used on fragile or small samples. Yet there is little evidence as to the efficacy of the different methods and whether the use of less rigorous methods is justified. We investigated four variations of AAA …
Allocation of Terrestrial Carbon Sources Using 14 CO 2
The radiocarbon content of whole air provides a theoretically ideal and now observationally proven tracer for recently added fossil-fuel-derived CO 2 in the atmosphere ( C ff ). Over large industrialized land areas, determination of C ff also constrains the change in CO 2 due to uptake and release by the terrestrial biosphere. Here, we review the development of a Δ 14 CO 2 measurement program and its implementation within the US portion of the NO…
Advancing Antarctic Sediment Chronology Through Combined Ramped Pyrolysis Oxidation and Pyrolysis-Gc-MS
Radiocarbon ( 14 C) dating of sediment deposition around Antarctica is often challenging due to heterogeneity in sources and ages of organic carbon in the sediment. Chemical and thermochemical techniques have been used to separate organic carbon when microfossils are not present. These techniques generally improve on bulk sediment dates, but they necessitate assumptions about the age spectra of specific molecules or compound classes and about the…
Radiocarbon and Atmospheric 14 Co 2 Pioneer Athol Rafter
Direct atmospheric 14 CO 2 measurements began in New Zealand in 1954, initially to improve 14 C as a dating tool, but quickly evolving into a method for understanding the carbon cycle. These early 14 CO 2 measurements immediately demonstrated the existence of an “Atom Bomb Effect,” as well as an “Industrial Effect.” These two gigantic tracer experiments have been utilized via 14 CO 2 measurements over the years to produce a wealth of knowledge in…
C Activity and Global Carbon Cycle Changes over the Past 50,000 Years
A series of 14 C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed 14 C …
Marine-derived 14C calibration and activity record for the past 50,000 years updated from the Cariaco Basin
A New Automated Extraction System for 14 C Measurement for Atmospheric Co 2
The radiocarbon content of atmospheric CO 2 (Δ 14 CO 2 ) has long been of interest to atmospheric and Earth system researchers. Recent improvements in 14 C measurement precision and reduction in sample size requirements have now made it possible to measure Δ 14 CO 2 within existing trace gas sampling networks, most notably as a method to quantify recently added fossil-fuel-derived CO 2 in the atmosphere. At INSTAAR, in collaboration with NOAA/ESR…
Refining the Chronology of the Agate Basin Complex
The Frazier site (5WL268) has been interpreted as a single component bison kill and processing site representative of the Paleoindian Agate Basin complex in northeastern Colorado. The site was excavated in the 1960s by H. Marie Wormington. An examination of six accelerator mass spectrometry 14C radiocarbon dates recently obtained on bison bone (amino acids) and charcoal collected during Wormington’s investigations suggest the Frazier site dates b…
Allocation of Terrestrial Carbon Sources Using 14 CO 2
The radiocarbon content of whole air provides a theoretically ideal and now observationally proven tracer for recently added fossil-fuel-derived CO 2 in the atmosphere ( C ff ). Over large industrialized land areas, determination of C ff also constrains the change in CO 2 due to uptake and release by the terrestrial biosphere. Here, we review the development of a Δ 14 CO 2 measurement program and its implementation within the US portion of the NO…
Quantification and source apportionment of the methane emission flux from the city of Indianapolis
We report the CH4 emission flux from the city of Indianapolis, IN, the site of the Indianapolis Flux Experiment (INFLUX) project for developing, assessing, and improving top-down and bottom-up approaches for quantifying urban greenhouse gas emissions. Using an aircraft-based mass balance approach, we find that the average CH4 emission rate from five flight experiments in 2011 is 135 ± 58 (1σ) moles s-1 (7800 ± 3300 kg hr-1). The effective per cap…
High-Precision Atmospheric 14 CO 2 Measurement at the Rafter Radiocarbon Laboratory
This article describes a new capability for high-precision 14 C measurement of CO 2 from air at the Rafter Radiocarbon Laboratory, GNS Science, New Zealand. We evaluate the short-term within-wheel repeatability and long-term between-wheel repeatability from measurements of multiple aliquots of control materials sourced from whole air. Samples are typically measured to 650,000 14 C counts, providing a nominal accelerator mass spectrometry (AMS) st…
Tower measurement network of in-situ CO2, CH4, and CO in support of the Indianapolis FLUX (INFLUX) Experiment
A twelve-station tower-based observation network measuring CO2, CH4, and CO was deployed in and around the Indianapolis, IN metropolitan area as part of the Indianapolis Flux Experiment (INFLUX). Measurements began in 2010 and the full network was deployed by 2013. Observations were made at heights ranging from 39 to 136 m above ground level using existing communication towers. Several towers in the network had multiple measurement levels. Cavity…
The Indianapolis Flux Experiment (INFLUX)
The objective of the Indianapolis Flux Experiment (INFLUX) is to develop, evaluate and improve methods for measuring greenhouse gas (GHG) emissions from cities. INFLUX’s scientific objectives are to quantify CO2 and CH4 emission rates at 1 km2 resolution with a 10% or better accuracy and precision, to determine whole-city emissions with similar skill, and to achieve high (weekly or finer) temporal resolution at both spatial resolutions. The exper…
Reconciling the differences between a bottom-up and inverse-estimated FFCO2 emissions estimate in a large US urban area
The INFLUX experiment has taken multiple approaches to estimate the carbon dioxide (CO2) flux in a domain centered on the city of Indianapolis, Indiana. One approach, Hestia, uses a bottom-up technique relying on a mixture of activity data, fuel statistics, direct flux measurement and modeling algorithms. A second uses a Bayesian atmospheric inverse approach constrained by atmospheric CO2 measurements and the Hestia emissions estimate as a prior …
Assessing the optimized precision of the aircraft mass balance method for measurement of urban greenhouse gas emission rates through averaging
To effectively address climate change, aggressive mitigation policies need to be implemented to reduce greenhouse gas emissions. Anthropogenic carbon emissions are mostly generated from urban environments, where human activities are spatially concentrated. Improvements in uncertainty determinations and precision of measurement techniques are critical to permit accurate and precise tracking of emissions changes relative to the reduction targets. A…
Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source
We present measurements of CO mole fraction and CO stable isotopes (δ13CO and δC18O) in air during the winters of 2013–14 and 2014–15 at tall tower sampling sites in and around Indianapolis, USA. A tower located upwind of the city was used to quantitatively remove the background CO signal, allowing for the first unambiguous isotopic characterization of the urban CO source and yielding 13CO of –27.7 ± 0.5‰ VPDB and C18O of 17.7 ± 1.1‰ VSMOW for th…
Quantification of urban atmospheric boundary layer greenhouse gas dry mole fraction enhancements in the dormant season
We assess the detectability of city emissions via a tower-based greenhouse gas (GHG) network, as part of the Indianapolis Flux (INFLUX) experiment. By examining afternoon-averaged results from a network of carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) mole fraction measurements in Indianapolis, Indiana for 2011–2013, we quantify spatial and temporal patterns in urban atmospheric GHG dry mole fractions. The platform for these measu…
The Earliest Shell Fishhooks From the Americas Reveal Fishing Technology of Pleistocene Maritime Foragers
While the North American archaeological record signals the presence of early humans along the northeastern Pacific coast by the Late Pleistocene, we know little about the technological systems employed by these coastally oriented colonizing groups. We here report the discovery of the earliest unequivocal evidence for the use and manufacture of shell fishhooks in the western hemisphere. Four single-piece shell fishhooks dating to the terminal Plei…
Investigations into the use of multi-species measurements for source apportionment of the Indianapolis fossil fuel CO 2 signal
Current bottom up estimates of CO2 emission fluxes are based on a mixture of direct and indirect flux estimates relying to varying degrees on regulatory or self-reported data. Hence, it is important to use additional, independent information to assess biases and lower the flux uncertainty. We explore the use of a self-organizing map (SOM) as a tool to use multi-species observations to partition fossil fuel CO2 (CO2ff) emissions by economic source…
Seashore Settlement Patterns in the Koné and Naïa Periods
As part of a geological survey in southwest mainland New Caledonia, potsherds were recorded in the profiles at four coastal sites. Subsequent archaeological investigations at two of these sites have allowed us to diversify the ceramic data and show them to be local variants of Podtanean, Puen, and Plum ceramic types. These are characteristic of production in the southern part of the archipelago during the first millennium BC and first millennium …
Pretreatment of Terrestrial Macrofossils
Acid-alkali-acid (AAA) pretreatment is widely used to clean terrestrial plant macrofossil samples for radiocarbon ( 14 C) dating. There is wide variation amongst laboratories in the AAA method details and less rigorous AAA pretreatment is often used on fragile or small samples. Yet there is little evidence as to the efficacy of the different methods and whether the use of less rigorous methods is justified. We investigated four variations of AAA …
Source decomposition of eddy-covariance CO 2 flux measurements for evaluating a high-resolution urban CO 2 emissions inventory
We present the comparison of source-partitioned CO 2 flux measurements with a high-resolution urban CO 2 emissions inventory (Hestia). Tower-based measurements of CO and 14 C are used to partition net CO 2 flux measurements into fossil and biogenic components. A flux footprint model is used to quantify spatial variation in flux measurements. We compare the daily cycle and spatial structure of Hestia and eddy-covariance derived fossil fuel CO 2 em…
Radiocarbon and Atmospheric 14 Co 2 Pioneer Athol Rafter
Direct atmospheric 14 CO 2 measurements began in New Zealand in 1954, initially to improve 14 C as a dating tool, but quickly evolving into a method for understanding the carbon cycle. These early 14 CO 2 measurements immediately demonstrated the existence of an “Atom Bomb Effect,” as well as an “Industrial Effect.” These two gigantic tracer experiments have been utilized via 14 CO 2 measurements over the years to produce a wealth of knowledge in…
Atmospheric Radiocarbon for the Period 1950–2019
This paper presents a compilation of atmospheric radiocarbon for the period 1950–2019, derived from atmospheric CO 2 sampling and tree rings from clean-air sites. Following the approach taken by Hua et al. (2013), our revised and extended compilation consists of zonal, hemispheric and global radiocarbon ( 14 C) data sets, with monthly data sets for 5 zones (Northern Hemisphere zones 1, 2, and 3, and Southern Hemisphere zones 3 and 1–2). Our new c…
Comprehensive Update of Marine Reservoir Values for New Zealand Coastal Waters to Inform Coastal Hazard Research
Marine radiocarbon ( 14 C) ages are an important geochronology tool for the understanding of past earthquakes and tsunamis that have impacted the coastline of New Zealand. To advance this field of research, we need an improved understanding of the radiocarbon marine reservoir correction for coastal waters of New Zealand. Here we report 170 new ΔR 20 (1900–1950) measurements from around New Zealand made on pre-1950 marine shells and mollusks kille…
Advancing Antarctic Sediment Chronology Through Combined Ramped Pyrolysis Oxidation and Pyrolysis-Gc-MS
Radiocarbon ( 14 C) dating of sediment deposition around Antarctica is often challenging due to heterogeneity in sources and ages of organic carbon in the sediment. Chemical and thermochemical techniques have been used to separate organic carbon when microfossils are not present. These techniques generally improve on bulk sediment dates, but they necessitate assumptions about the age spectra of specific molecules or compound classes and about the…
Detection of local-scale changes in greenhouse gas emissions in urban environments using micrometeorological methods and comparison to a high-resolution inventory
We used the Monin–Obukhov similarity theory (MOST) flux-variance relationship to estimate greenhouse gas (GHG) fluxes from high-precision mole fraction measurements at 3 instrumented urban communication towers over several years, demonstrating the ability of this method to detect and quantify changes in emissions. Depending on data availability, we used carbon dioxide (CO2) and carbon monoxide (CO) measurements and/or tracer ratios to estimate fl…
Geology (17 works) · Atmospheric and Environmental Gas Dynamics (16 works) · Chemistry (14 works) · Environmental Science (14 works) · Radiocarbon dating (12 works) · Geography (11 works) · Atmospheric sciences (10 works) · Atmospheric chemistry and aerosols (9 works) · Physics (8 works) · Geology and Paleoclimatology Research (7 works)