Stefan Wastegård
Biographic Data
| ID | 4129447 |
|---|---|
| NAME | Stefan Wastegård |
| GIVEN NAMES | Stefan |
| FAMILY NAME | Wastegård |
| SIGNATURE | WASTEGÅRD S |
| AFFILIATIONS | Stockholm University |
| ORCID | 0000-0002-8131-1569 |
| VERIFIED | Yes |
| TOTAL WORKS | 18 |
| TOTAL CITATIONS | 26 |
| AUTHOR COUNT | 18 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1995 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 4 |
Granlund’s recurrence surfaces revisited and reanalysed
Peatlands provide some of the most continuous and informative archives for reconstructing Holocene environmental and climatic changes. Their potential was recognised in the late 19th century, but systematic investigations began in the early 20th century, notably through the work of Swedish scientists. Among these, Erik Granlund made a particularly influential contribution by identifying a series of “recurrence surfaces” (rekurrensytor, RY) in sou…
Climatic variability during the last millennium in Western Iceland from lake sediment records
The aim of this research was to create a decadal-scale terrestrial quantitative palaeoclimate record for NW Iceland from lake sediments for the last millennium. Geochemical, stable isotope and chironomid reconstructions were obtained from a lake sequence constrained by tephra deposits on the Snæfellsnes peninsula, western Iceland. Obtaining a quantitative record proved problematic, but the qualitative chironomid record showed clear trends associa…
Tephrostratigraphy of the Potrok Aike Maar Sediment Sequence
Tephrostratigraphy of the Potrok Aike Maar Lake Sediment Sequence
A chironomid-based reconstruction of summer temperatures in NW Iceland since AD 1650
Few studies currently exist that aim to validate a proxy chironomid-temperature reconstruction with instrumental temperature measurements. We used a reconstruction from a chironomid percentage abundance data set to produce quantitative summer temperature estimates since AD 1650 for NW Iceland through a transfer function approach, and validated the record against instrumental temperature measurements from Stykkishólmur in western Iceland. The core…
Identification of the Icelandic Landnám tephra (AD 871 ± 2) in Scottish fjordic sediment
Tephra horizons contemporary with short early Holocene climate fluctuations
Recommendations for using XRF core scanning as a tool in tephrochronology
X-ray fluorescence (XRF) core scanning is a relatively new arrangement of a classic analytical technique which allows for non-destructive, in situ XRF analysis of sediment cores from submillimetre resolution upwards. In this contribution we explore the use of XRF core scanning for tephrochronology based on the analysis of three gyttja-rich sediment cores from the Faroe Islands. Using a combination of optical and radiographic images, analytical pa…
Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra
The middle Holocene Hekla-S/Kebister tephra originates in the Hekla volcanic system on SW Iceland. The distal distribution of the tephra includes the Faroe Islands, Shetland and Central Sweden, indicating a main dispersal towards the east. The chemical composition of the tephra follows the pattern of other major eruptions of Hekla, and ratios between selected oxides may in some cases allow separation from other major Holocene tephras from Hekla. …
Late Quaternary tephrochronology of Sweden
Climate change and human settlement as drivers of late-Holocene vegetational change in the Faroe Islands
Changes in Faroese land surfaces during the late Holocene reflect intimate interactions between cultural and environmental development. Analyses of fossil wood, pollen and plant macrofossils indicate that the present open landscape replaced shrubby vegetation that was present from c. 6000 BC Up to C. AD 660. Conditions altered during the late Holocene, with loss of woody vegetation and increasing erosion: trends that were initiated prior to human…
Salinity changes in the central Baltic Sea (NW Europe) over the last 10 000 years
We question the effort to date the lower part of a core from the Baltic Sea with a combination of tephra layers and stratigraphical markers. No geochemical data is presented for the two tephra layers, believed to be the Saksunarvatn Ash and Vedde Ash. Furthermore, the age used for one of the stratigraphical markers is erroneous. We present two alternative age models, of which the second gives a plausible sediment accumulation rate but excludes th…
Extending the limits of the Borrobol Tephra to Scandinavia and detection of new early Holocene tephras
Analyses of two infilled lakes in Blekinge, southeast Sweden, indicate the presence of at least three tephra horizons of Termination 1 and early Holocene age. Geochemical analyses confirm the presence of the Borrobol Tephra, the Askja Tephra (10,000 14 C yr B.P.), and one previously unreported tephra of Icelandic origin. Extending the limits of the Borrobol Tephra to Scandinavia illustrates that this ash is far more widespread than previously rea…
Rhyolitic tephra horizons in northwestern Europe and Iceland from the AD 700s–800s
The distribution and geochemistry of four rhyolitic tephra horizons from Iceland dated to the ad 700s–800s is assessed. These include the rhyolitic phase of the Landnám tephra (ad 870s), the ad 860 layer, a previously unrecorded tephra called the GA4–85 layer (c. ad 700–800) and the Tjïrnuvík tephra (c. ad 800s). The ad 860 and GA4–85 layers were first found in peat bogs in north Ireland. They are here correlated with equivalent horizons on Icela…
The Mjáuvøtn tephra and other Holocene tephra horizons from the Faroe Islands
Six different tephra horizons were found in peat and lacustrine sediments on the Faroe Islands in the North Atlantic. Their geochemistry showed that they were of Icelandic origin. Three of these can be correlated with previously described tephra horizons from the Faroe Islands: the Saksunarvatn tephra ( c. 9000 BP), the Hekla-4 ( c. 3800 BP) and Hekla-Selsund ( c. 3600 BP). A previously unrecorded basaltic tephra dated to c. 5700-5300 BP was foun…
Deglaciation, shore displacement and early-Holocene vegetation history in eastern middle Sweden
The sedimentary record at Lake Vibysjo lake basin is situated close to the Närke Strait where the main water exchange occurred between the Vänern basin and Baltic basin during the middle and late phases of the Yoldia Sea stage of the Baltic Sea (c. 10 000– 9500 14 C years BP). The area was deglaciated in a glaciomarine environment, as reflected by the occurrence of benthic calcareous fossils (foraminifera, ostracods and the mollusc Portlandia arc…
Different phases of the Yoldia Sea in the north-western Baltic Proper
Late Weichselian-early Holocene stratigraphy and environmental conditions in southwestern Värmland, Sweden
Recommendations for using XRF core scanning as a tool in tephrochronology
X-ray fluorescence (XRF) core scanning is a relatively new arrangement of a classic analytical technique which allows for non-destructive, in situ XRF analysis of sediment cores from submillimetre resolution upwards. In this contribution we explore the use of XRF core scanning for tephrochronology based on the analysis of three gyttja-rich sediment cores from the Faroe Islands. Using a combination of optical and radiographic images, analytical pa…
Climate change and human settlement as drivers of late-Holocene vegetational change in the Faroe Islands
Changes in Faroese land surfaces during the late Holocene reflect intimate interactions between cultural and environmental development. Analyses of fossil wood, pollen and plant macrofossils indicate that the present open landscape replaced shrubby vegetation that was present from c. 6000 BC Up to C. AD 660. Conditions altered during the late Holocene, with loss of woody vegetation and increasing erosion: trends that were initiated prior to human…
Rhyolitic tephra horizons in northwestern Europe and Iceland from the AD 700s–800s
The distribution and geochemistry of four rhyolitic tephra horizons from Iceland dated to the ad 700s–800s is assessed. These include the rhyolitic phase of the Landnám tephra (ad 870s), the ad 860 layer, a previously unrecorded tephra called the GA4–85 layer (c. ad 700–800) and the Tjïrnuvík tephra (c. ad 800s). The ad 860 and GA4–85 layers were first found in peat bogs in north Ireland. They are here correlated with equivalent horizons on Icela…
The Mjáuvøtn tephra and other Holocene tephra horizons from the Faroe Islands
Six different tephra horizons were found in peat and lacustrine sediments on the Faroe Islands in the North Atlantic. Their geochemistry showed that they were of Icelandic origin. Three of these can be correlated with previously described tephra horizons from the Faroe Islands: the Saksunarvatn tephra ( c. 9000 BP), the Hekla-4 ( c. 3800 BP) and Hekla-Selsund ( c. 3600 BP). A previously unrecorded basaltic tephra dated to c. 5700-5300 BP was foun…
Climatic variability during the last millennium in Western Iceland from lake sediment records
The aim of this research was to create a decadal-scale terrestrial quantitative palaeoclimate record for NW Iceland from lake sediments for the last millennium. Geochemical, stable isotope and chironomid reconstructions were obtained from a lake sequence constrained by tephra deposits on the Snæfellsnes peninsula, western Iceland. Obtaining a quantitative record proved problematic, but the qualitative chironomid record showed clear trends associa…
Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra
The middle Holocene Hekla-S/Kebister tephra originates in the Hekla volcanic system on SW Iceland. The distal distribution of the tephra includes the Faroe Islands, Shetland and Central Sweden, indicating a main dispersal towards the east. The chemical composition of the tephra follows the pattern of other major eruptions of Hekla, and ratios between selected oxides may in some cases allow separation from other major Holocene tephras from Hekla. …
Different phases of the Yoldia Sea in the north-western Baltic Proper
Late Weichselian-early Holocene stratigraphy and environmental conditions in southwestern Värmland, Sweden
Deglaciation, shore displacement and early-Holocene vegetation history in eastern middle Sweden
The sedimentary record at Lake Vibysjo lake basin is situated close to the Närke Strait where the main water exchange occurred between the Vänern basin and Baltic basin during the middle and late phases of the Yoldia Sea stage of the Baltic Sea (c. 10 000– 9500 14 C years BP). The area was deglaciated in a glaciomarine environment, as reflected by the occurrence of benthic calcareous fossils (foraminifera, ostracods and the mollusc Portlandia arc…
The Mjáuvøtn tephra and other Holocene tephra horizons from the Faroe Islands
Six different tephra horizons were found in peat and lacustrine sediments on the Faroe Islands in the North Atlantic. Their geochemistry showed that they were of Icelandic origin. Three of these can be correlated with previously described tephra horizons from the Faroe Islands: the Saksunarvatn tephra ( c. 9000 BP), the Hekla-4 ( c. 3800 BP) and Hekla-Selsund ( c. 3600 BP). A previously unrecorded basaltic tephra dated to c. 5700-5300 BP was foun…
Extending the limits of the Borrobol Tephra to Scandinavia and detection of new early Holocene tephras
Analyses of two infilled lakes in Blekinge, southeast Sweden, indicate the presence of at least three tephra horizons of Termination 1 and early Holocene age. Geochemical analyses confirm the presence of the Borrobol Tephra, the Askja Tephra (10,000 14 C yr B.P.), and one previously unreported tephra of Icelandic origin. Extending the limits of the Borrobol Tephra to Scandinavia illustrates that this ash is far more widespread than previously rea…
Rhyolitic tephra horizons in northwestern Europe and Iceland from the AD 700s–800s
The distribution and geochemistry of four rhyolitic tephra horizons from Iceland dated to the ad 700s–800s is assessed. These include the rhyolitic phase of the Landnám tephra (ad 870s), the ad 860 layer, a previously unrecorded tephra called the GA4–85 layer (c. ad 700–800) and the Tjïrnuvík tephra (c. ad 800s). The ad 860 and GA4–85 layers were first found in peat bogs in north Ireland. They are here correlated with equivalent horizons on Icela…
Late Quaternary tephrochronology of Sweden
Climate change and human settlement as drivers of late-Holocene vegetational change in the Faroe Islands
Changes in Faroese land surfaces during the late Holocene reflect intimate interactions between cultural and environmental development. Analyses of fossil wood, pollen and plant macrofossils indicate that the present open landscape replaced shrubby vegetation that was present from c. 6000 BC Up to C. AD 660. Conditions altered during the late Holocene, with loss of woody vegetation and increasing erosion: trends that were initiated prior to human…
Salinity changes in the central Baltic Sea (NW Europe) over the last 10 000 years
We question the effort to date the lower part of a core from the Baltic Sea with a combination of tephra layers and stratigraphical markers. No geochemical data is presented for the two tephra layers, believed to be the Saksunarvatn Ash and Vedde Ash. Furthermore, the age used for one of the stratigraphical markers is erroneous. We present two alternative age models, of which the second gives a plausible sediment accumulation rate but excludes th…
Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra
The middle Holocene Hekla-S/Kebister tephra originates in the Hekla volcanic system on SW Iceland. The distal distribution of the tephra includes the Faroe Islands, Shetland and Central Sweden, indicating a main dispersal towards the east. The chemical composition of the tephra follows the pattern of other major eruptions of Hekla, and ratios between selected oxides may in some cases allow separation from other major Holocene tephras from Hekla. …
A chironomid-based reconstruction of summer temperatures in NW Iceland since AD 1650
Few studies currently exist that aim to validate a proxy chironomid-temperature reconstruction with instrumental temperature measurements. We used a reconstruction from a chironomid percentage abundance data set to produce quantitative summer temperature estimates since AD 1650 for NW Iceland through a transfer function approach, and validated the record against instrumental temperature measurements from Stykkishólmur in western Iceland. The core…
Identification of the Icelandic Landnám tephra (AD 871 ± 2) in Scottish fjordic sediment
Tephra horizons contemporary with short early Holocene climate fluctuations
Recommendations for using XRF core scanning as a tool in tephrochronology
X-ray fluorescence (XRF) core scanning is a relatively new arrangement of a classic analytical technique which allows for non-destructive, in situ XRF analysis of sediment cores from submillimetre resolution upwards. In this contribution we explore the use of XRF core scanning for tephrochronology based on the analysis of three gyttja-rich sediment cores from the Faroe Islands. Using a combination of optical and radiographic images, analytical pa…
Tephrostratigraphy of the Potrok Aike Maar Sediment Sequence
Tephrostratigraphy of the Potrok Aike Maar Lake Sediment Sequence
Climatic variability during the last millennium in Western Iceland from lake sediment records
The aim of this research was to create a decadal-scale terrestrial quantitative palaeoclimate record for NW Iceland from lake sediments for the last millennium. Geochemical, stable isotope and chironomid reconstructions were obtained from a lake sequence constrained by tephra deposits on the Snæfellsnes peninsula, western Iceland. Obtaining a quantitative record proved problematic, but the qualitative chironomid record showed clear trends associa…
Granlund’s recurrence surfaces revisited and reanalysed
Peatlands provide some of the most continuous and informative archives for reconstructing Holocene environmental and climatic changes. Their potential was recognised in the late 19th century, but systematic investigations began in the early 20th century, notably through the work of Swedish scientists. Among these, Erik Granlund made a particularly influential contribution by identifying a series of “recurrence surfaces” (rekurrensytor, RY) in sou…
Geology and Paleoclimatology Research (18 works) · Geology (15 works) · Holocene (13 works) · Tephra (13 works) · Volcano (13 works) · Paleontology (12 works) · Geography (11 works) · Oceanography (11 works) · Physical geography (11 works) · Geochemistry (8 works)