Willy Wölfli
Biographic Data
| ID | 5597039 |
|---|---|
| NAME | Willy Wölfli |
| GIVEN NAMES | Willy |
| FAMILY NAME | Wölfli |
| SIGNATURE | WÖLFLI W |
| VERIFIED | No |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 76 |
| WORKS AS AUTHOR | 11 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1986 |
| LATEST PUBLICATION YEAR | 2001 |
| H-INDEX | 5 |
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
CalibETH
A computer program for convenient calibration of radiocarbon dates has been developed. The program has a simple user interface, which includes pull-down menus, windows and mouse support. All important information, such as calibration curves, probability density function and results, in text form, are displayed on the screen and easily can be rearranged by the user. Two versions of CalibETH, one for an IBM-PC and one for the Macintosh, are availab…
Radiocarbon Dating of Fourteen Dead Sea Scrolls
The name Dead Sea Scrolls refers to some 1200 manuscripts found in caves in the hills on the western shore of the Dead Sea during the last 45 years. They range in size from small fragments to complete books from the holy scriptures (the Old Testament). The manuscripts also include uncanonized sectarian books, letters and commercial documents, written on papyrus and parchment. In only a few cases, direct information on the date of writing was foun…
Accelerator Mass Spectrometric Radiocarbon Measurements on Foraminifera Shells from Deep-Sea Cores
Radiocarbon ages determined by the AMS method on hand-picked foraminifera shells are reported. The results allow estimates of the ventilation rate of the deep Atlantic and Pacific Oceans during glacial time. They also extend our knowledge of the chronology of events associated with the transition from full glacial conditions ca 15,000 years ago to full interglacial conditions ca 8000 years ago. This and the previous lists (Broecker et al 1988c) c…
Atmospheric Radiocarbon at the End of the Last Glacial
The main purpose of this work is to reconstruct the atmospheric Δ 14 C in the glacial-postglacial transition, 14,000 – 10,000 BP, a range not covered by the tree-ring calibration curve. We measured 14 C/ 12 C ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric 14 C concentration. Due…
Anomalous AMS Radiocarbon Ages for Foraminifera from High-Deposition-Rate Ocean Sediments
Radiocarbon ages on handpicked foraminifera from deep-sea cores are revealing that areas of rapid sediment accumulation are in some cases subject to hiatuses, reworking and perhaps secondary calcite deposition. We present here an extreme example of the impacts of such disturbances. The message is that if precise chronologies or meaningful benthic planktic age differences are to be obtained, then it is essential to document the reliability of radi…
Measurement of Small Volume Oceanic 14 C Samples by Accelerator Mass Spectrometry
A technique for 14 C measurement of small volume (0.5L) oceanic water samples by Accelerator Mass Spectrometry (AMS) is described. Samples were taken from a CTD/rosette system used for standard hydrographic work. After CO 2 extraction and target preparation, the samples were measured at the Zürich tandem accelerator facility. On the basis of 14 C data from samples collected on a station in the northern Weddell Sea, the precision of the measuremen…
AMS Radiocarbon Dates on Foraminifera from Deep Sea Sediments
14 C ages were determined on samples of foraminifera separated from cores from three areas of the tropical Pacific (East Pacific Rise, Oontong Java Plateau, and South China Sea). Analyses were made on four planktonic species and on mixed benthics. The purpose of the multiple analysis on planktonic species is to assess the importance of artifacts resulting from the bioturbation-abundance change couple, from the bioturbation-partial dissolution cou…
Archaeologic Sherd Dating
Sherds can be dated by four independent methods: 14 C beta counting on associated material, accelerator mass spectrometry on carbon traces on and within the sherd, thermoluminescence studies on minerals within the sherd, and stylistic form. Age analyses of materials and sherds from several sites are shown in this work. Each technique has its own frequently encountered non-laboratory sources of error. A combination of at least two independent tech…
The ETH/SIN Dating Facility
The ETH/SIN AMS dating facility is routinely used for 10 Be, 14 C, 26 Al, and 36 Cl measurements. The present status and performance of this facility are reviewed and some of its major applications summarized
Dating Polar Ice by 14 C Accelerator Mass Spectrometry
Results of 14 C/ 12 C ratio measurements on CO 2 extracted from air bubbles in polar ice are presented. The samples investigated originate from the Dye 3, South Greenland, deep ice core and span approximately the last 10,000 years. The results are calibrated with tree-ring records. The 14 C ages are compared with information obtained from seasonal variations of ice-core parameters and rheologic model calculation
Radiocarbon Dating of Fourteen Dead Sea Scrolls
The name Dead Sea Scrolls refers to some 1200 manuscripts found in caves in the hills on the western shore of the Dead Sea during the last 45 years. They range in size from small fragments to complete books from the holy scriptures (the Old Testament). The manuscripts also include uncanonized sectarian books, letters and commercial documents, written on papyrus and parchment. In only a few cases, direct information on the date of writing was foun…
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
Archaeologic Sherd Dating
Sherds can be dated by four independent methods: 14 C beta counting on associated material, accelerator mass spectrometry on carbon traces on and within the sherd, thermoluminescence studies on minerals within the sherd, and stylistic form. Age analyses of materials and sherds from several sites are shown in this work. Each technique has its own frequently encountered non-laboratory sources of error. A combination of at least two independent tech…
CalibETH
A computer program for convenient calibration of radiocarbon dates has been developed. The program has a simple user interface, which includes pull-down menus, windows and mouse support. All important information, such as calibration curves, probability density function and results, in text form, are displayed on the screen and easily can be rearranged by the user. Two versions of CalibETH, one for an IBM-PC and one for the Macintosh, are availab…
Atmospheric Radiocarbon at the End of the Last Glacial
The main purpose of this work is to reconstruct the atmospheric Δ 14 C in the glacial-postglacial transition, 14,000 – 10,000 BP, a range not covered by the tree-ring calibration curve. We measured 14 C/ 12 C ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric 14 C concentration. Due…
Accelerator Mass Spectrometric Radiocarbon Measurements on Foraminifera Shells from Deep-Sea Cores
Radiocarbon ages determined by the AMS method on hand-picked foraminifera shells are reported. The results allow estimates of the ventilation rate of the deep Atlantic and Pacific Oceans during glacial time. They also extend our knowledge of the chronology of events associated with the transition from full glacial conditions ca 15,000 years ago to full interglacial conditions ca 8000 years ago. This and the previous lists (Broecker et al 1988c) c…
AMS Radiocarbon Dates on Foraminifera from Deep Sea Sediments
14 C ages were determined on samples of foraminifera separated from cores from three areas of the tropical Pacific (East Pacific Rise, Oontong Java Plateau, and South China Sea). Analyses were made on four planktonic species and on mixed benthics. The purpose of the multiple analysis on planktonic species is to assess the importance of artifacts resulting from the bioturbation-abundance change couple, from the bioturbation-partial dissolution cou…
Anomalous AMS Radiocarbon Ages for Foraminifera from High-Deposition-Rate Ocean Sediments
Radiocarbon ages on handpicked foraminifera from deep-sea cores are revealing that areas of rapid sediment accumulation are in some cases subject to hiatuses, reworking and perhaps secondary calcite deposition. We present here an extreme example of the impacts of such disturbances. The message is that if precise chronologies or meaningful benthic planktic age differences are to be obtained, then it is essential to document the reliability of radi…
Measurement of Small Volume Oceanic 14 C Samples by Accelerator Mass Spectrometry
A technique for 14 C measurement of small volume (0.5L) oceanic water samples by Accelerator Mass Spectrometry (AMS) is described. Samples were taken from a CTD/rosette system used for standard hydrographic work. After CO 2 extraction and target preparation, the samples were measured at the Zürich tandem accelerator facility. On the basis of 14 C data from samples collected on a station in the northern Weddell Sea, the precision of the measuremen…
Dating Polar Ice by 14 C Accelerator Mass Spectrometry
Results of 14 C/ 12 C ratio measurements on CO 2 extracted from air bubbles in polar ice are presented. The samples investigated originate from the Dye 3, South Greenland, deep ice core and span approximately the last 10,000 years. The results are calibrated with tree-ring records. The 14 C ages are compared with information obtained from seasonal variations of ice-core parameters and rheologic model calculation
AMS Radiocarbon Dates on Foraminifera from Deep Sea Sediments
14 C ages were determined on samples of foraminifera separated from cores from three areas of the tropical Pacific (East Pacific Rise, Oontong Java Plateau, and South China Sea). Analyses were made on four planktonic species and on mixed benthics. The purpose of the multiple analysis on planktonic species is to assess the importance of artifacts resulting from the bioturbation-abundance change couple, from the bioturbation-partial dissolution cou…
Archaeologic Sherd Dating
Sherds can be dated by four independent methods: 14 C beta counting on associated material, accelerator mass spectrometry on carbon traces on and within the sherd, thermoluminescence studies on minerals within the sherd, and stylistic form. Age analyses of materials and sherds from several sites are shown in this work. Each technique has its own frequently encountered non-laboratory sources of error. A combination of at least two independent tech…
The ETH/SIN Dating Facility
The ETH/SIN AMS dating facility is routinely used for 10 Be, 14 C, 26 Al, and 36 Cl measurements. The present status and performance of this facility are reviewed and some of its major applications summarized
Dating Polar Ice by 14 C Accelerator Mass Spectrometry
Results of 14 C/ 12 C ratio measurements on CO 2 extracted from air bubbles in polar ice are presented. The samples investigated originate from the Dye 3, South Greenland, deep ice core and span approximately the last 10,000 years. The results are calibrated with tree-ring records. The 14 C ages are compared with information obtained from seasonal variations of ice-core parameters and rheologic model calculation
Measurement of Small Volume Oceanic 14 C Samples by Accelerator Mass Spectrometry
A technique for 14 C measurement of small volume (0.5L) oceanic water samples by Accelerator Mass Spectrometry (AMS) is described. Samples were taken from a CTD/rosette system used for standard hydrographic work. After CO 2 extraction and target preparation, the samples were measured at the Zürich tandem accelerator facility. On the basis of 14 C data from samples collected on a station in the northern Weddell Sea, the precision of the measuremen…
Atmospheric Radiocarbon at the End of the Last Glacial
The main purpose of this work is to reconstruct the atmospheric Δ 14 C in the glacial-postglacial transition, 14,000 – 10,000 BP, a range not covered by the tree-ring calibration curve. We measured 14 C/ 12 C ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric 14 C concentration. Due…
Anomalous AMS Radiocarbon Ages for Foraminifera from High-Deposition-Rate Ocean Sediments
Radiocarbon ages on handpicked foraminifera from deep-sea cores are revealing that areas of rapid sediment accumulation are in some cases subject to hiatuses, reworking and perhaps secondary calcite deposition. We present here an extreme example of the impacts of such disturbances. The message is that if precise chronologies or meaningful benthic planktic age differences are to be obtained, then it is essential to document the reliability of radi…
Accelerator Mass Spectrometric Radiocarbon Measurements on Foraminifera Shells from Deep-Sea Cores
Radiocarbon ages determined by the AMS method on hand-picked foraminifera shells are reported. The results allow estimates of the ventilation rate of the deep Atlantic and Pacific Oceans during glacial time. They also extend our knowledge of the chronology of events associated with the transition from full glacial conditions ca 15,000 years ago to full interglacial conditions ca 8000 years ago. This and the previous lists (Broecker et al 1988c) c…
CalibETH
A computer program for convenient calibration of radiocarbon dates has been developed. The program has a simple user interface, which includes pull-down menus, windows and mouse support. All important information, such as calibration curves, probability density function and results, in text form, are displayed on the screen and easily can be rearranged by the user. Two versions of CalibETH, one for an IBM-PC and one for the Macintosh, are availab…
Radiocarbon Dating of Fourteen Dead Sea Scrolls
The name Dead Sea Scrolls refers to some 1200 manuscripts found in caves in the hills on the western shore of the Dead Sea during the last 45 years. They range in size from small fragments to complete books from the holy scriptures (the Old Testament). The manuscripts also include uncanonized sectarian books, letters and commercial documents, written on papyrus and parchment. In only a few cases, direct information on the date of writing was foun…
Radiocarbon Dates of Old and Middle Kingdom Monuments in Egypt
Between 1984 and 1995 over 450 organic samples were collected from monuments built during the Old and Middle Kingdoms. The most suitable samples were selected for dating. The purpose was to establish a radiocarbon chronology with samples from secure context and collected with the careful techniques required for 14 C samples. This chronology is compared to the historical chronology established by reconstructing written documentation
Geology (11 works) · Radiocarbon dating (10 works) · Paleontology (8 works) · Accelerator mass spectrometry (6 works) · Archaeology and ancient environmental studies (6 works) · Geology and Paleoclimatology Research (6 works) · Isotope Analysis in Ecology (5 works) · Oceanography (5 works) · Physics (5 works) · Archaeology (4 works)