Simon Fahrni
Dados Biográficos
| ID | 5597052 |
|---|---|
| NOME | Simon Fahrni |
| PRENOMES | Simon |
| SOBRENOME | Fahrni |
| ASSINATURA | FAHRNI S |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 5 |
| TOTAL DE CITAÇÕES | 39 |
| TOTAL COMO AUTOR | 5 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2010 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2017 |
| ÍNDICE H | 3 |
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
Speed Dating
Radiocarbon measurements in tree rings can be used to estimate atmospheric 14 C concentration and thereby used to create a 14 C calibration curve. When wood is discovered in construction sites, rivers, buildings, and lake sediments, it is unclear if the wood could fill gaps in the 14 C calibration curve or if the wood is of historical interest until the age is determined by dendrochronology or 14 C dating. However, dendrochronological dating is s…
Online 13 C and 14 C Gas Measurements by EA-IRMS–AMS at ETH Zürich
Studies using carbon isotopes to understand the global carbon cycle are critical to identify and quantify sources, sinks, and processes and how humans may impact them. 13 C and 14 C are routinely measured individually; however, there is a need to develop instrumentation that can perform concurrent online analyses that can generate rich data sets conveniently and efficiently. To satisfy these requirements, we coupled an elemental analyzer to a sta…
C Contamination Testing in Natural Abundance Laboratories
Substances enriched with radiocarbon can easily contaminate samples and laboratories used for natural abundance measurements. We have developed a new method using wet chemical oxidation for swabbing laboratories and equipment to test for 14 C contamination. Here, we report the findings of 18 months’ work and more than 800 tests covering studies at multiple locations. Evidence of past and current use of enriched 14 C was found at all but one locat…
Towards On-Line 14 C Analysis of Carbonaceous Aerosol Fractions
Atmospheric carbonaceous aerosol is traditionally divided into organic carbon (OC) and elemental carbon (EC). Their respective carbon amounts are usually analyzed by means of an OC/EC analyzer and their fossil and non-fossil origins can be determined by radiocarbon analysis, which has proven to be a powerful tool for carbonaceous aerosol source apportionment. Thus far, separation of OC and EC has been performed off-line by manual and time-consumi…
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
Online 13 C and 14 C Gas Measurements by EA-IRMS–AMS at ETH Zürich
Studies using carbon isotopes to understand the global carbon cycle are critical to identify and quantify sources, sinks, and processes and how humans may impact them. 13 C and 14 C are routinely measured individually; however, there is a need to develop instrumentation that can perform concurrent online analyses that can generate rich data sets conveniently and efficiently. To satisfy these requirements, we coupled an elemental analyzer to a sta…
Speed Dating
Radiocarbon measurements in tree rings can be used to estimate atmospheric 14 C concentration and thereby used to create a 14 C calibration curve. When wood is discovered in construction sites, rivers, buildings, and lake sediments, it is unclear if the wood could fill gaps in the 14 C calibration curve or if the wood is of historical interest until the age is determined by dendrochronology or 14 C dating. However, dendrochronological dating is s…
C Contamination Testing in Natural Abundance Laboratories
Substances enriched with radiocarbon can easily contaminate samples and laboratories used for natural abundance measurements. We have developed a new method using wet chemical oxidation for swabbing laboratories and equipment to test for 14 C contamination. Here, we report the findings of 18 months’ work and more than 800 tests covering studies at multiple locations. Evidence of past and current use of enriched 14 C was found at all but one locat…
Towards On-Line 14 C Analysis of Carbonaceous Aerosol Fractions
Atmospheric carbonaceous aerosol is traditionally divided into organic carbon (OC) and elemental carbon (EC). Their respective carbon amounts are usually analyzed by means of an OC/EC analyzer and their fossil and non-fossil origins can be determined by radiocarbon analysis, which has proven to be a powerful tool for carbonaceous aerosol source apportionment. Thus far, separation of OC and EC has been performed off-line by manual and time-consumi…
Towards On-Line 14 C Analysis of Carbonaceous Aerosol Fractions
Atmospheric carbonaceous aerosol is traditionally divided into organic carbon (OC) and elemental carbon (EC). Their respective carbon amounts are usually analyzed by means of an OC/EC analyzer and their fossil and non-fossil origins can be determined by radiocarbon analysis, which has proven to be a powerful tool for carbonaceous aerosol source apportionment. Thus far, separation of OC and EC has been performed off-line by manual and time-consumi…
C Contamination Testing in Natural Abundance Laboratories
Substances enriched with radiocarbon can easily contaminate samples and laboratories used for natural abundance measurements. We have developed a new method using wet chemical oxidation for swabbing laboratories and equipment to test for 14 C contamination. Here, we report the findings of 18 months’ work and more than 800 tests covering studies at multiple locations. Evidence of past and current use of enriched 14 C was found at all but one locat…
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
Speed Dating
Radiocarbon measurements in tree rings can be used to estimate atmospheric 14 C concentration and thereby used to create a 14 C calibration curve. When wood is discovered in construction sites, rivers, buildings, and lake sediments, it is unclear if the wood could fill gaps in the 14 C calibration curve or if the wood is of historical interest until the age is determined by dendrochronology or 14 C dating. However, dendrochronological dating is s…
Online 13 C and 14 C Gas Measurements by EA-IRMS–AMS at ETH Zürich
Studies using carbon isotopes to understand the global carbon cycle are critical to identify and quantify sources, sinks, and processes and how humans may impact them. 13 C and 14 C are routinely measured individually; however, there is a need to develop instrumentation that can perform concurrent online analyses that can generate rich data sets conveniently and efficiently. To satisfy these requirements, we coupled an elemental analyzer to a sta…
Chemistry (4 obras) · Environmental Science (4 obras) · Radiocarbon dating (4 obras) · Accelerator mass spectrometry (3 obras) · Environmental Chemistry (3 obras) · Geology (3 obras) · Physics (3 obras) · Archaeology (2 obras) · Geography (2 obras) · Geology and Paleoclimatology Research (2 obras)