Modelling start of oak pollen season in different climatic zones in Spain

Garcı́a-Mozo, Herminia; Galán, Carmen; Aira, María Jesús; Belmonte, Jordina; Guardia, Consuelo Díaz de la; Fernández, Domingo; Gutiérrez, Ángel; Rodríguez, Francisco J.; Trigo, M.M.; Domínguez-Vilches, Eugenio

doi:10.1016/s0168-1923(02)00003-5

Cited by 79 publications

(61 citation statements)

References 32 publications

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“…The total area occupied by the species in a grid cell, γ , was determined using fractional vegetation and land cover data sets such as the National (Duhl et al, 2013). The onset and duration of pollen season for each species was based on the thermal time approach, modeled after García-Mozo et al (2002). Pollen is available to be released into the atmosphere after a prescribed species-specific threshold of heat-accumulation units (i.e., growing degree days, GDD) for flowering.…”

Section: Stamps Modelmentioning

confidence: 99%

Development of a regional-scale pollen emission and transport modeling framework for investigating the impact of climate change on allergic airway disease

et al. 2014

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Abstract. Exposure to bioaerosol allergens such as pollen can cause exacerbations of allergenic airway disease (AAD) in sensitive populations, and thus cause serious public health problems. Assessing these health impacts by linking the airborne pollen levels, concentrations of respirable allergenic material, and human allergenic response under current and future climate conditions is a key step toward developing preventive and adaptive actions. To that end, a regional-scale pollen emission and transport modeling framework was developed that treats allergenic pollens as non-reactive tracers within the coupled Weather Research and Forecasting Community Multiscale Air Quality (WRF/CMAQ) modeling system. The Simulator of the Timing and Magnitude of Pollen Season (STaMPS) model was used to generate a daily pollen pool that can then be emitted into the atmosphere by wind. The STaMPS is driven by species-specific meteorological (temperature and/or precipitation) threshold conditions and is designed to be flexible with respect to its representation of vegetation species and plant functional types (PFTs). The hourly pollen emission flux was parameterized by considering the pollen pool, friction velocity, and wind threshold values. The dry deposition velocity of each species of pollen was estimated based on pollen grain size and density. An evaluation of the pollen modeling framework was conducted for southern California (USA) for the period from March to June 2010. This period coincided with observations by the University of Southern California's Children's Health Study (CHS), which included O 3 , PM 2.5 , and pollen count, as well as measurements of exhaled nitric oxide in study participants. Two nesting domains with horizontal resolutions of 12 and 4 km were constructed, and six representative allergenic pollen genera were included: birch tree, walnut tree, mulberry tree, olive tree, oak tree, and brome grasses. Under the current parameterization scheme, the modeling framework tends to underestimate walnut and peak oak pollen concentrations, and tends to overestimate grass pollen concentrations. The model shows reasonable agreement with observed birch, olive, and mulberry tree pollen concentrations. Sensitivity studies suggest that the estimation of the pollen pool is a major source of uncertainty for simulated pollen concentrations. Achieving agreement between emission modeling and observed pattern of pollen releases is the key for successful pollen concentration simulations.

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Section: Stamps Modelmentioning

confidence: 99%

Development of a regional-scale pollen emission and transport modeling framework for investigating the impact of climate change on allergic airway disease

et al. 2014

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“…Non-parametric statistics have been used in the past to measure the date when the chilling requirement is completely satisfied in O. europaea in central Italy the "heat" amounts such as growing degree days and hours (Snyder et al 1999;Garcia-Mozo et al 2002).…”

Section: Introductionmentioning

confidence: 99%

New model to predict the timing of olive(Olea europaea)flowering: A case study in central Italy

Orlandi¹,

Lanari

Romano

et al. 2006

New Zealand Journal of Crop and Horticultural Science

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The aim of this study was to analyse the statistical relationships among climatic variables and flowering dates for olive species (Olea europaea). Data were collected over 21 years from the study area located in the province of Perugia, central Italy. Flowering was studied through the aerobiological method and daily pollen concentrations (expressed as pollen grains/ m 3 ) were recorded. A new flowering forecasting indicator (modified chilling unit, CUm) is proposed to identify the beginning and the central phase of anthesis (maximum pollen concentration) in olive groves. Correlation and regression analyses were carried out regarding two different flowering stages and meteorological variables expressed as thermal amounts. A mean temperature variable was introduced to consider the current conditions during flowering (from the first pollen concentrations to the maximum). The best fitting model was obtained considering the maximum pollen concentration date and the modified chilling unit formula with a cut-off temperature of 12°C. The validity of this model was tested using data from 1999 to 2002 (not included in the model parameterisation). The results showed that this new climatic indicator is able to accurately forecast the timine of fiowerina for olive trees.

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“…The pollination period lasts over 100 d and peaks in the spring and summer. Some studies suggest that spring-flowering species tend to delay the onset of the main pollen season (Corden and Millington 1999;Emberlin et al 2002;García-Mozo et al 2002). The same behaviour was noted in Vigo, where flowering has tended to start increasingly later in recent years and to last a shorter period of time.…”

Section: Discussionmentioning

confidence: 87%

Airborne Ericaceae Pollen Grains in the Atmosphere of Vigo (Northwest Spain) and Its Relationship with Meteorological Factors

Rodríguez-Rajo

Méndez

Jato

2005

J Integrative Plant Biology

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Several species of the Erica genus are broadly represented in northwest Spain, being among the shrubs that form the substitution stage following forest degradation as a result of human activity, caused mainly by fire or other antrophic causes. Therefore airborne pollen from Erica is frequent. From 1995 to 2002, an aerobiological study of Ericaceae family pollen was undertaken in the atmosphere of the city of Vigo (Northwest Spain) using a Lanzoni VPPS 2000 (Lanzoni srl, Bologna, Italy) sampler placed in the left margin of the Vigo fiord (42°14'15'' N, 8°43'30'' W). Despite being a taxon of eminently entomophillous pollination, the pollen of Ericaceae was well represented in the atmosphere above the study zone. Erica arborea L. is the main species represented in the annual pollen curve. This taxon shows a long main pollen season and higher pollen concentrations were recorded during the months of April and May, which is why beekeepers place their beehives at specific locations in April to ensure a considerable contribution from this pollen to the composition of the honey. The maximum daily average concentration was detected in 1997, with a concentration of 156 grains/m 3 . Throughout the day, maximum values occur at 5/6 h and between 17:00 and 18:00 h. Finally, correlation statistical analyses were developed in order to determine the degree of association between the daily average of meteorological parameters and daily mean airborne pollen concentrations. Rainfall exerts a clear influence on Ericaceae pollen season characteristics, with precipitation registered in March being responsible for the decrease in total annual pollen values.

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Modelling start of oak pollen season in different climatic zones in Spain

Cited by 79 publications

References 32 publications

Development of a regional-scale pollen emission and transport modeling framework for investigating the impact of climate change on allergic airway disease

Development of a regional-scale pollen emission and transport modeling framework for investigating the impact of climate change on allergic airway disease

New model to predict the timing of olive(Olea europaea)flowering: A case study in central Italy

Airborne Ericaceae Pollen Grains in the Atmosphere of Vigo (Northwest Spain) and Its Relationship with Meteorological Factors

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