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  1. Article ; Online: Analysis of high allergenicity airborne pollen dispersion: common ragweed study case in Lithuania.

    Šaulienė, Ingrida / Veriankaitė, Laura

    Annals of agricultural and environmental medicine : AAEM

    2012  Volume 19, Issue 3, Page(s) 415–419

    Abstract: The appearance of ragweed pollen in the air became more frequent in northerly countries. Attention of allergologists and aerobiologists in these countries is focused on the phenomenon that Ambrosia plants found relatively sporadic but the amount of ... ...

    Abstract The appearance of ragweed pollen in the air became more frequent in northerly countries. Attention of allergologists and aerobiologists in these countries is focused on the phenomenon that Ambrosia plants found relatively sporadic but the amount of pollen is high in particular days. Over the latter decade, a matter of particular concern has been Ambrosia pollen, whose appearance in the air is determined by the plants dispersing it and meteorological processes that alter pollen release, dissemination, transport or deposition on surfaces. Pollen data used in this study were collected in three pollen-trapping sites in Lithuania. The data corresponding to 2006-2011 years of pollen monitoring were documented graphically and evaluated statistically. Analysis of the pollen data suggests that although the number of ragweed plants identified has not increased over the latter decade, the total pollen count has been on the increase during the recent period. The highest atmospheric pollen load is established on the last days of August and first days of September. The estimated effect of meteorological parameters on pollen dispersal in the air showed that in Lithuania ragweed pollen is recorded when the relative air humidity is about 70%, and the minimal air temperature is not less than 12°C. Analysis of wind change effect on pollen count indicates that pollen is most often recorded in the air when the changes in wind speed are low (1-2 m/s). We have established a regularity exhibiting an increase in ragweed pollen count conditioned by south-eastern winds in Lithuania.
    MeSH term(s) Air Pollutants/adverse effects ; Air Pollutants/isolation & purification ; Allergens/adverse effects ; Allergens/isolation & purification ; Ambrosia/adverse effects ; Ambrosia/growth & development ; Environmental Monitoring ; Humans ; Lithuania ; Pollen/adverse effects ; Pollen/growth & development ; Rhinitis, Allergic, Seasonal/etiology ; Risk Factors ; Seasons ; Time Factors ; Weather
    Chemical Substances Air Pollutants ; Allergens
    Language English
    Publishing date 2012
    Publishing country Poland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1215115-4
    ISSN 1898-2263 ; 1232-1966
    ISSN (online) 1898-2263
    ISSN 1232-1966
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Modelling analysis of source regions of long-range transported birch pollen that influences allergenic seasons in Lithuania

    Veriankaitė, Laura / Siljamo, Pilvi / Sofiev, Mikhail / Šaulienė, Ingrida / Kukkonen, Jaakko

    Aerobiologia. 2010 Mar., v. 26, no. 1

    2010  

    Abstract: This study analyses the spatial and temporal distribution of regional and long-range transported birch (Betula L.) pollen in Lithuania and the neighbouring countries. The potential long-range transport cases of birch pollen in Lithuania were analysed for ...

    Abstract This study analyses the spatial and temporal distribution of regional and long-range transported birch (Betula L.) pollen in Lithuania and the neighbouring countries. The potential long-range transport cases of birch pollen in Lithuania were analysed for the whole period of available observations, 2004-2007. The birch pollen was recorded at three measurement stations in Lithuania by using Hirst-type volumetric spore traps. The phenological observations in Lithuania were also used for the detection of potential long-range transport-induced episodes. Two variants of the regional and continental scale atmospheric dispersion model SILAM (Lagrangian and Eulerian) in an adjoint mode (used for inverse dispersion modelling and data assimilation), and the trajectory model HYSPLIT were employed to evaluate the source origins of the observed pollen. During four seasons in 2004-2007, we found in total 24 cases, during which remarkable pollen concentrations were recorded before the local flowering season. According to modelling, most of these were originated from the sources outside Lithuania: Latvia, southern Sweden, Denmark, Belarus, Ukraine and Moldova, possibly, also coastal regions of Germany and Poland. Two episodes were attributed to local early-flowering birch trees. The spatial and temporal patterns of the long-range transport of early pollen to Lithuania were found out to be highly variable; the predicted source regions for the cases considered were similar only for some dates in 2004 and 2006. During the analysed period, we found both cases, in which the predictions of the SILAM model variants and those of the HYSPLIT model were similar, and cases, in which there were substantial differences. In general, for complicated atmospheric circulation patterns the model predictions can be drastically different, with a tendency of trajectory model to fail reproducing the key episode features.
    Keywords Betula ; allergenicity ; atmospheric circulation ; flowering ; models ; pollen ; prediction ; traps ; trees ; Belarus ; Denmark ; Germany ; Latvia ; Lithuania ; Moldova ; Poland ; Sweden ; Ukraine
    Language English
    Size p. 47-62.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1499126-3
    ISSN 1573-3025 ; 0393-5965
    ISSN (online) 1573-3025
    ISSN 0393-5965
    DOI 10.1007/s10453-009-9142-6
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: A numerical model of birch pollen emission and dispersion in the atmosphere. Model evaluation and sensitivity analysis

    Siljamo, Pilvi / Sofiev, Mikhail / Filatova, Elena / Grewling, Łukasz / Jäger, Siegfried / Khoreva, Ekaterina / Linkosalo, Tapio / Ortega Jimenez, Sara / Ranta, Hanna / Rantio-Lehtimäki, Auli / Svetlov, Anton / Veriankaite, Laura / Yakovleva, Ekaterina / Kukkonen, Jaakko

    International journal of biometeorology. 2013 Jan., v. 57, no. 1

    2013  

    Abstract: An evaluation of performance of the System for Integrated modeLling of Atmospheric coMposition (SILAM) in application to birch pollen dispersion is presented. The system is described in a companion paper whereas the current study evaluates the model ... ...

    Abstract An evaluation of performance of the System for Integrated modeLling of Atmospheric coMposition (SILAM) in application to birch pollen dispersion is presented. The system is described in a companion paper whereas the current study evaluates the model sensitivity to details of the pollen emission module parameterisation and to the meteorological input data. The most important parameters are highlighted. The reference year considered for the analysis is 2006. It is shown that the model is capable of predicting about two-thirds of allergenic alerts, with the odds ratio exceeding 12 for the best setup. Several other statistics corroborate with these estimations. Low-pollen concentration days are also predicted correctly in more than two-thirds of cases. The model experiences certain difficulties only with intermediate pollen concentrations. It is demonstrated that the most important input parameter is the near-surface temperature, the bias of which can easily jeopardise the results. The model sensitivity to random fluctuations of temperature is much lower. Other parameters important at various stages of pollen development, release, and dispersion are precipitation and ambient humidity, as well as wind direction.
    Keywords Betula ; allergenicity ; atmosphere ; atmospheric chemistry ; humidity ; mathematical models ; odds ratio ; pollen ; prediction ; temperature ; wind direction
    Language English
    Dates of publication 2013-01
    Size p. 125-136.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 127361-9
    ISSN 0067-8902 ; 0020-7128
    ISSN 0067-8902 ; 0020-7128
    DOI 10.1007/s00484-012-0539-5
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: A numerical model of birch pollen emission and dispersion in the atmosphere. Model evaluation and sensitivity analysis.

    Siljamo, Pilvi / Sofiev, Mikhail / Filatova, Elena / Grewling, Łukasz / Jäger, Siegfried / Khoreva, Ekaterina / Linkosalo, Tapio / Ortega Jimenez, Sara / Ranta, Hanna / Rantio-Lehtimäki, Auli / Svetlov, Anton / Veriankaite, Laura / Yakovleva, Ekaterina / Kukkonen, Jaakko

    International journal of biometeorology

    2012  Volume 57, Issue 1, Page(s) 125–136

    Abstract: An evaluation of performance of the System for Integrated modeLling of Atmospheric coMposition (SILAM) in application to birch pollen dispersion is presented. The system is described in a companion paper whereas the current study evaluates the model ... ...

    Abstract An evaluation of performance of the System for Integrated modeLling of Atmospheric coMposition (SILAM) in application to birch pollen dispersion is presented. The system is described in a companion paper whereas the current study evaluates the model sensitivity to details of the pollen emission module parameterisation and to the meteorological input data. The most important parameters are highlighted. The reference year considered for the analysis is 2006. It is shown that the model is capable of predicting about two-thirds of allergenic alerts, with the odds ratio exceeding 12 for the best setup. Several other statistics corroborate with these estimations. Low-pollen concentration days are also predicted correctly in more than two-thirds of cases. The model experiences certain difficulties only with intermediate pollen concentrations. It is demonstrated that the most important input parameter is the near-surface temperature, the bias of which can easily jeopardise the results. The model sensitivity to random fluctuations of temperature is much lower. Other parameters important at various stages of pollen development, release, and dispersion are precipitation and ambient humidity, as well as wind direction.
    MeSH term(s) Atmosphere ; Betula ; Europe ; Flowers ; Models, Theoretical ; Pollen ; Weather
    Language English
    Publishing date 2012-03-22
    Publishing country United States
    Document type Evaluation Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280324-0
    ISSN 1432-1254 ; 0020-7128
    ISSN (online) 1432-1254
    ISSN 0020-7128
    DOI 10.1007/s00484-012-0539-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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