Scott J Lehman
Biographic Data
| ID | 5597350 |
|---|---|
| NAME | Scott J Lehman |
| GIVEN NAMES | Scott J |
| FAMILY NAME | Lehman |
| SIGNATURE | LEHMAN S J |
| AFFILIATIONS | Institute of Arctic and Alpine Research |
| ORCID | 0000-0002-8865-9584 |
| VERIFIED | Yes |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 68 |
| AUTHOR COUNT | 13 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1992 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 3 |
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 Dating of a Middle Paleolithic Blade Industry in Southern Russia and Its Relationship to the Initial Upper Paleolithic
Assessing fossil fuel CO 2 emissions in California using atmospheric observations and models
Analysis systems incorporating atmospheric observations could provide a powerful tool for validating fossil fuel CO 2 (ffCO 2 ) emissions reported for individual regions, provided that fossil fuel sources can be separated from other CO 2 sources or sinks and atmospheric transport can be accurately accounted for. We quantified ffCO 2 by measuring radiocarbon ( 14 C) in CO 2 , an accurate fossil-carbon tracer, at nine observation sites in Californi…
Compatibility of Atmospheric 14 CO 2 Measurements
Combining atmospheric Δ 14 CO 2 data sets from different networks or laboratories requires secure knowledge on their compatibility. In the present study, we compare Δ 14 CO 2 results from the Heidelberg low-level counting (LLC) laboratory to 12 international accelerator mass spectrometry (AMS) laboratories using distributed aliquots of five pure CO 2 samples. The averaged result of the LLC laboratory has a measurement bias of –0.3±0.5‰ with respe…
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…
Abrupt onset of the Little Ice Age triggered by volcanism and sustained by sea‐ice/ocean feedbacks
Northern Hemisphere summer temperatures over the past 8000 years have been paced by the slow decrease in summer insolation resulting from the precession of the equinoxes. However, the causes of superposed century‐scale cold summer anomalies, of which the Little Ice Age (LIA) is the most extreme, remain debated, largely because the natural forcings are either weak or, in the case of volcanism, short lived. Here we present precisely dated records o…
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 …
Synchronous Radiocarbon and Climate Shifts During the Last Deglaciation
Radiocarbon data from the Cariaco Basin provide calibration of the carbon-14 time scale across the period of deglaciation (15,000 to 10,000 years ago) with resolution available previously only from Holocene tree rings. Reconstructed changes in atmospheric carbon-14 are larger than previously thought, with the largest change occurring simultaneously with the sudden climatic cooling of the Younger Dryas event. Carbon-14 and published beryllium-10 d…
Deglacial changes in ocean circulation from an extended radiocarbon calibration
A New 14 C Calibration Data Set for the Last Deglaciation Based on Marine Varves
Varved sediments of the tropical Cariaco Basin provide a new 14 C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10–14.5 cal ka bp). Independent evaluations of the Cariaco Basin calendar and 14 C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to 14 C age agreement with terrestrial 14 C dates, …
Late Weichselian Glacier Retreat in Kongsfjorden, West Spitsbergen, Svalbard
The chronology of Late Weichselian to Holocene deglaciation of Kongsfjorden, west Spitsbergen has been reconstructed based on the geomorphic and stratigraphic record of ice retreat, relative sea-level relationships, and 14 C dating of associated marine organic materials. The seaward extent of glacial drift and fjord bathymetry constrain a secure reconstruction for the ice sheet near the mouth of the fjord at ca. 13,000 yr B.P., but do not rule ou…
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 Dating of a Middle Paleolithic Blade Industry in Southern Russia and Its Relationship to the Initial Upper Paleolithic
Compatibility of Atmospheric 14 CO 2 Measurements
Combining atmospheric Δ 14 CO 2 data sets from different networks or laboratories requires secure knowledge on their compatibility. In the present study, we compare Δ 14 CO 2 results from the Heidelberg low-level counting (LLC) laboratory to 12 international accelerator mass spectrometry (AMS) laboratories using distributed aliquots of five pure CO 2 samples. The averaged result of the LLC laboratory has a measurement bias of –0.3±0.5‰ with respe…
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…
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…
A New 14 C Calibration Data Set for the Last Deglaciation Based on Marine Varves
Varved sediments of the tropical Cariaco Basin provide a new 14 C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10–14.5 cal ka bp). Independent evaluations of the Cariaco Basin calendar and 14 C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to 14 C age agreement with terrestrial 14 C dates, …
Late Weichselian Glacier Retreat in Kongsfjorden, West Spitsbergen, Svalbard
The chronology of Late Weichselian to Holocene deglaciation of Kongsfjorden, west Spitsbergen has been reconstructed based on the geomorphic and stratigraphic record of ice retreat, relative sea-level relationships, and 14 C dating of associated marine organic materials. The seaward extent of glacial drift and fjord bathymetry constrain a secure reconstruction for the ice sheet near the mouth of the fjord at ca. 13,000 yr B.P., but do not rule ou…
A New 14 C Calibration Data Set for the Last Deglaciation Based on Marine Varves
Varved sediments of the tropical Cariaco Basin provide a new 14 C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10–14.5 cal ka bp). Independent evaluations of the Cariaco Basin calendar and 14 C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to 14 C age agreement with terrestrial 14 C dates, …
Deglacial changes in ocean circulation from an extended radiocarbon calibration
Synchronous Radiocarbon and Climate Shifts During the Last Deglaciation
Radiocarbon data from the Cariaco Basin provide calibration of the carbon-14 time scale across the period of deglaciation (15,000 to 10,000 years ago) with resolution available previously only from Holocene tree rings. Reconstructed changes in atmospheric carbon-14 are larger than previously thought, with the largest change occurring simultaneously with the sudden climatic cooling of the Younger Dryas event. Carbon-14 and published beryllium-10 d…
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…
Abrupt onset of the Little Ice Age triggered by volcanism and sustained by sea‐ice/ocean feedbacks
Northern Hemisphere summer temperatures over the past 8000 years have been paced by the slow decrease in summer insolation resulting from the precession of the equinoxes. However, the causes of superposed century‐scale cold summer anomalies, of which the Little Ice Age (LIA) is the most extreme, remain debated, largely because the natural forcings are either weak or, in the case of volcanism, short lived. Here we present precisely dated records o…
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…
Compatibility of Atmospheric 14 CO 2 Measurements
Combining atmospheric Δ 14 CO 2 data sets from different networks or laboratories requires secure knowledge on their compatibility. In the present study, we compare Δ 14 CO 2 results from the Heidelberg low-level counting (LLC) laboratory to 12 international accelerator mass spectrometry (AMS) laboratories using distributed aliquots of five pure CO 2 samples. The averaged result of the LLC laboratory has a measurement bias of –0.3±0.5‰ with respe…
Assessing fossil fuel CO 2 emissions in California using atmospheric observations and models
Analysis systems incorporating atmospheric observations could provide a powerful tool for validating fossil fuel CO 2 (ffCO 2 ) emissions reported for individual regions, provided that fossil fuel sources can be separated from other CO 2 sources or sinks and atmospheric transport can be accurately accounted for. We quantified ffCO 2 by measuring radiocarbon ( 14 C) in CO 2 , an accurate fossil-carbon tracer, at nine observation sites in Californi…
The Dating of a Middle Paleolithic Blade Industry in Southern Russia and Its Relationship to the Initial Upper Paleolithic
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…
Geology and Paleoclimatology Research (9 works) · Radiocarbon dating (9 works) · Geography (7 works) · Climatology (6 works) · Environmental Science (6 works) · Geology (6 works) · Geology (6 works) · Oceanography (6 works) · Physical geography (6 works) · Archaeology and ancient environmental studies (5 works)