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| 2. |
- Petersen, Christian, et al.
(författare)
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Femtosecond photolysis of aqueous formamide
- 2008
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Ingår i: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 112:15, s. 3339-3344
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Scheike, Thomas, et al.
(författare)
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Time Trends in Human Fecundability in Sweden.
- 2008
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Ingår i: Epidemiology. - 1531-5487. ; 19:2, s. 191-196
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND:: Trends in biologic fertility are elusive. Possible negative trends in male reproductive health are still debated, and their effect on human fertility might be negligible. Time-to-pregnancy (TTP) is a functional measure of couple fecundability. METHODS:: We analyzed data on TTP among 832,000 primiparous women 20 years of age and older in the nationwide Swedish Medical Birth Registry from 1983 through 2002. This age restriction led to an exclusion of 10% of primiparous pregnancies. Subfertility (TTP >/=1 year) was analyzed as a function of maternal age, calendar time at initiation of attempt, and birth cohort-taking into account the truncation problems that are inherent in birth-based retrospective sampling. RESULTS:: Subfertility generally decreased over successive birth cohorts. When studied as a period effect, a transient increase in subfertility was seen in the early 1990s. Subfertility increased with age, except that for women in their late 1930s, an apparent decrease was observed, particularly among the early cohorts. CONCLUSION:: We found decreasing subfertility over time. We speculate that these patterns might be related to a Sweden-specific decrease over time in sexually transmitted diseases, to changes in sexual behavior induced by socioeconomic conditions, or to broader biologic or educational trends.
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| 4. |
- Schomacker, Anders, et al.
(författare)
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Late Holocene and modern glacier changes in the marginal zone of Solheimajokull, South Iceland
- 2012
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Ingår i: Jökull: Journal of the Glaciological and Geological Societies of Iceland. - 0449-0576. ; 62, s. 111-130
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Tidskriftsartikel (refereegranskat)abstract
- The forefield of the Solheimajokull outlet glacier, South Iceland, has a variety of glacial landforms and sediments that are products of late Holocene and modern glacier oscillations. Several sets of moraine ridges reflect past ice front positions and river-cut sedimentary sections provide information about past environments. Here, we describe sediments and landforms deposited during the late Holocene. Chronology is obtained by C-14 dating and cosmogenic exposure dating. The age determinations suggest that Solheimajokull had major advances in the late Holocene prior to the Little Ice Age, and more restricted advances during the Little Ice Age, after AD 1539. Oscillations of the Solheimajokull ice margin between 1938 and 2010 are documented by aerial photographs. Digital elevation models were produced from selected years in order to quantify ice thickness changes at the glacier margin over the last 50 years. The glacier margin thickened 70-100 m front 1960 to 1996 and then thinned 120-150 m between 1996 and 2010. In 2010, the glacier snout was 20-40 in thinner than in 1960. Additionally, the DEM time-series detect areas of erosion and deposition in the forefield.
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| 5. |
- Svennevig, Kristian, et al.
(författare)
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Uncovering a 70-year-old permafrost degradation-induced disaster in the Arctic : the 1952 Niiortuut landslide tsunami in central West Greenland
- 2022
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Ingår i: Science of the Total Environment. - : Elsevier. - 0048-9697 .- 1879-1026. ; 859
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Tidskriftsartikel (refereegranskat)abstract
- On December 15th 1952, at approximately 14:00 local time a mass of 5.9 × 106 m3 of permafrozen talus deposits failed in a landslide close to the Niiortuut mountain on the south coast of the Nuussuaq peninsula, central West Greenland. Between 1.8 and 4.5 × 106 m3 of the material entered the sea and generated a tsunami that propagated through the Vaigat strait (Sullorsuaq). Here we describe this catastrophic event for the first time by analysis of historical material supplemented by recent fieldwork and discuss the implications for the state of contemporary permafrozen slopes. The tsunami killed a fisherman working on the shore of southern Nuussuaq, 10 km south-east of the landslide. In the mining town of Qullissat, 30 km south of the landslide, it had a runup height of 2.2–2.7 m and caused minor material damage. Morphological evidence show that the basal surface of rupture was 80 m inside the permafrost cemented talus slope, whose degradation was a dynamic conditioning factor for the landslide. The 1952 Niiortuut landslide is the first historically recorded event of permafrost degradation induced landslide-tsunamis in the Arctic. We infer that the landslide and its cascading consequences occurred due to the early-twentieth century warming that started in the late 1910's in the Arctic. Warming is now increasingly affecting this region, as shown by an enhanced recent landslide activity.
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