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- Alm Kübler, Kerstin
(författare)
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Holocene Environmental Change of Southern Öland, Sweden
- 2001
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis describes Holocene environmental change in Ottenby, southern Öland,Sweden. Analyses of pollen sequences collected distally in the Littorina ridge and in fentroughs between lower laying beach ridges show the vegetation history during twoperiods, the first around 8000 BP and the second from 0/500 AD to about present time.Ages were obtained by radiocarbon datings.The sediments reveal the approaching Littorina transgression. A pond was formedbehind anearlier ridge, and the Littorina ridge was deposited above the organic sequence in thepond. At this time(8000 BP) the vegetation was dominated by deciduous forests of an open character.The sequences from the series of fens formed within the system of beach ridgesreveal the natureof late Holocene environmental change. During the centuries before the Viking Agecattle-breeding was important and open grasslands created by grazing prevailed.Utilization of landscape resources increased as the population increased, and a Callunaheath developed around 800 AD. This shows that under special conditions a heath candevelop in an area with low precipitation if the human impact is heavy enough.In 1546 King Gustav Vasa declared Ottenby a Royal Estate and evicted thepopulation from Ottenby village. The Ottenby area was then governed as one coherentunit. This relieved pressure on the landscape and the modern landscape came into being.The pollen sequences corresponding to the time c. 1500 AD and onwards are inaccordance with the information in the written sources.This study also shows that Fagus sylvatica most probably grew on southern Ölandduring the Middle Ages.
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- Mattsson, Magnus, 1964-, et al.
(författare)
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Ventilation filter efficiency for birch pollen allergens : experimental data from one pollen season
- 2011
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Ingår i: Proceedings from Roomvent 2011. - Trondheim : Tapir Akademisk Forlag. - 9788251928120
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Konferensbidrag (refereegranskat)abstract
- In an experimental study, ventilation filters of high quality (F7 & F9) were tested regarding their efficiency in collecting birch pollen allergens in outdoor air. The birch pollen grain concentration in outdoor air was measured at the same time as pollen allergen and particle number concentrations were measured before and after the tested ventilation filters, thus enabling collection efficiency calculations. Simultaneously, the size distribution of birch pollen allergens was measured in outdoor air using a cascade impactor. The study confirms previous indications that pollen allergens may occur in outdoor air in particles much smaller than pollen grains, and can penetrate ventilation filters to a larger extent than might be expected. This entails that although the high quality filters collect most of outdoor air pollen allergens, a significant exposure dose to these allergens can occur in the indoor environment, especially when considering the fact most people stay much more indoors than outdoors. The study also confirms previous similar indications attained with grass pollen allergens, in that the allergenic particles tend to penetrate ventilation filters to a greater extent than other airborne particles.
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- Mattsson, Magnus, 1964-, et al.
(författare)
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Ventilation filter efficiency for particles and grass pollen allergens
- 2009
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Ingår i: Proceedings of the 9th International Healthy Buildings Conference and Exhibition.
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Konferensbidrag (refereegranskat)abstract
- In an experimental study, commonly used ventilation fine filters were tested regarding their efficiency in collecting airborne particles and grass pollen allergens from outdoor air. Grass pollen allergen and particle number concentrations were measured before and after the filters, enabling collection efficiency calculations. Simultaneously, the size distribution of grass pollen allergens was measured in outdoor air using a cascade impactor. The study confirms previous indications that pollen allergens occur in the outdoor air as particles much smaller than pollen grains, and can penetrate ventilation filters to a larger extent than might be expected. The initially high collection efficiency of synthetic, electrostatically charged filters declined significantly with time of use (dust load), whereas glass fiber filters showed steady performance. A slight tendency for pollen allergenic matter to penetrate ventilation filters more than other airborne particles was noted, but no difference in the response to electrostatic charge of filters could be seen.
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- Menzel, Annette, et al.
(författare)
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European phenological response to climate change matches the warming pattern
- 2006
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Ingår i: Global Change Biology. - 1354-1013 .- 1365-2486. ; 12:10, s. 1969-1976
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Tidskriftsartikel (refereegranskat)abstract
- Global climate change impacts can already be tracked in many physical and biological systems; in particular, terrestrial ecosystems provide a consistent picture of observed changes. One of the preferred indicators is phenology, the science of natural recurring events, as their recorded dates provide a high-temporal resolution of ongoing changes. Thus, numerous analyses have demonstrated an earlier onset of spring events for mid and higher latitudes and a lengthening of the growing season. However, published single-site or single-species studies are particularly open to suspicion of being biased towards predominantly reporting climate change-induced impacts. No comprehensive study or meta-analysis has so far examined the possible lack of evidence for changes or shifts at sites where no temperature change is observed. We used an enormous systematic phenological network data set of more than 125000 observational series of 542 plant and 19 animal species in 21 European countries (1971-2000). Our results showed that 78% of all leafing, flowering and fruiting records advanced (30% significantly) and only 3% were significantly delayed, whereas the signal of leaf colouring/fall is ambiguous. We conclude that previously published results of phenological changes were not biased by reporting or publication predisposition: the average advance of spring/summer was 2.5 days decade -1 in Europe. Our analysis of 254 mean national time series undoubtedly demonstrates that species' phenology is responsive to temperature of the preceding months (mean advance of spring/summer by 2.5 days °C -1, delay of leaf colouring and fall by 1.0 day °C -1). The pattern of observed change in spring efficiently matches measured national warming across 19 European countries (correlation coefficient r = -0.69, P < 0.001).
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- Påhlsson, Ingemar, et al.
(författare)
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Pollen och makrofossilanalys
- 1995
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Ingår i: Fagerlund, Dan; HAmilton, John: Arkeologi på väg - undersökningar för E18. Annelund - en hällkista och bebyggelse från senneolitikum och bronsålder. - : Riksantikvarieämbetet. - 9171929932 ; :13
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Annan publikation (övrigt vetenskapligt/konstnärligt)
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