Investigation of actinic flux in mountainous areas
Abstract
The general goal of the proposed project is to improve our understanding of the influence of topography and of three dimensional (3-D) radiation effects on the ultraviolet actinic flux and its implications for photolysis in the lower troposphere under conditions representative for the alpine region. The investigations will be through case studies and will focus on cloudless conditions, a situation very favorable for photochemical pollution. Two approaches will be taken in this investigation: An experimental approach will consist of measurements of the actinic flux, radiance, irradiance and of additional parameters of the surroundings (3-D aerosol characteristics, ground reflectivity, column ozone, aerosol optical depth) which have an influence on the actinic flux. These measurements will be performed within the scope of campaigns in Winter and in Summer at two different alpine locations, where simultaneous measurements will be performed at different altitudes. The theoretical approaches to calculate the actinic flux and the 3-D radiation field will be 3-D radiative transfer models as well as empirical algorithms. The models and algorithms will first be adapted to topographically structured terrain. They will then be validated using the experimental results to determine on the one hand the model input parameters and on the other hand to compare the model output with the measured irradiance, radiances and actinic flux. By using the aforementioned algorithms and models, simulations will be performed for some typical orographical locations and for possible changes in atmospheric particles and trace gases (mainly column ozone) concentrations and changes in surrounding conditions such as snow line and snow reflectance. Using measurements and the models and algorithms, the effect of the different parameters (albedo, aerosols, topography….) on actinic flux and photolysis rate will be quantified. The results of the project will be used to provide advice on how to best account for 3-D radiation effects in photochemical modeling in mountainous areas. Beside the improvements in modeling and measuring methods, the results will also serve to inform the wider UV community such as the biologists, the chemists and medical scientists.
keywords actinic flux
Publikationen
First case studies of 3-D Monte Carlo radiative transfer calculations in mountainous terrain in the UV wavelength range
Autoren: Wagner, J., Simic, S., Weihs, P. Jahr: 2007
Journal articles
Vergleich zwischen spektral hoch aufgelösten UV-Messungen und 3-D Monte Carlo Strahlungstransfer Modellrechnungen in Innsbruck und Umgebung
Autoren: Wagner, J., Weihs, P., Blumthaler, M., Webb, A., Gobbi, G.P., Simic, S., Kreuter, A., Rieder, H., Kift, R. Jahr: 2008
Conference & Workshop proceedings, paper, abstract
Comparison between high quality UV measurements and 3-D-Monte-Carlo radiative transfer calculations around Innsbruck
Autoren: Wagner, J.E.; Weihs, P.; Blumthaler, M.; Webb, A.; Gobbi, G.P.; Kift, R.; Kreuter, A.; Simic, S.; Rieder, H. Jahr: 2008
Journal articles
Comparison of ground-based UV irradiance measurements with satellite-derived values and 1-D and 3-D radiative transfer model calculations in mountainous terrain
Autoren: J.E. Wagner, A. Arola, M. Blumthaler, M., Fitzka, R. Kift, A. Kreuter, H.E. Rieder, S. Simic, A. Webb, P. Weihs Jahr: 2009
Journal articles
Comparison of surface UV irradiance in mountainous regions derived from satellite observations and model calculations with ground-based measurements
Autoren: Wagner, JE; Angelini, F; Arola, A; Blumthaler, M; Fitzka, M; Gobbi, GP; Kift, R; Kreuter, A; Rieder, HE; Simic, S; Webb, A; Weihs, P Jahr: 2010
Journal articles
INVESTIGATION OF ACTINIC FLUX IN MOUNTAINOUS AREAS UNDER CLOUDLESS CONDITIONS
Autoren: Weihs, P., Blumthaler, M., Fitzka, M., Simic, S., Wagner, J. Jahr: 2010
Forschungsbericht (extern. Auftraggeber)
Investigation of the three-dimensional actinic flux field in mountainous terrain
Autoren: J.E. Wagner, F. Angelini, M. Blumthaler, M. Fitzka, J.P. Gobbi, R. Kift, A. Kreuter, H. E. Rieder, A. Webb, and P. Weihs Jahr: 2010
Conference & Workshop proceedings, paper, abstract
The influence of the spatial resolution of topographic input data on the accuracy of 3-D UV actinic flux and irradiance calculations
Autoren: P Weihs, J E Wagner, S F Schreier, H E Rieder, F Angelini, M Blumthaler, M Fitzka, G P Gobbi, R Kift, A Kreuter, S Simic,;A R Webb Jahr: 2011
Journal articles
Investigation of the 3-D actinic flux field in mountainous terrain
Autoren: Wagner, JE; Angelini, F; Blumthaler, M; Fitzka, M; Gobbi, GP; Kift, R; Kreuter, A; Rieder, HE; Simic, S; Webb, A; Weihs, P Jahr: 2011
Journal articles
Investigation of surface UV radiation and UV radiative transfer through the at-mosphere
Autoren: Wagner, Jochen Jahr: 2011
Doctoral Thesis
The influence of the spatial resolution of topographic input data on the accuracy of 3-D UV actinic flux and irradiance calculations
Autoren: Weihs, P; Wagner, JE; Schreier, SF; Rieder, HE; Angelini, F; Blumthaler, M; Fitzka, M; Gobbi, GP; Kift, R; Kreuter, A; Simic, S; Webb, AR Jahr: 2012
Journal articles
Project staff
Philipp Weihs
Ao.Univ.Prof. Mag.rer.nat. Dr.rer.nat. Philipp Weihs
philipp.weihs@boku.ac.at
Tel: +43 1 47654-81424
Project Leader
01.10.2006 - 31.12.2009
Stana Simic
Mag. Dr. Stana Simic
stana.simic@boku.ac.at
Tel: +43 1 47654-81430
Project Staff
01.10.2006 - 31.12.2009
Jochen Wagner
Dipl.-Met. Dr. Jochen Wagner
jochen.wagner@boku.ac.at
Project Staff
01.10.2006 - 31.12.2009
BOKU partners
External partners
Consiglio Nazionale delle Ricerche
none
partner
Medizinische Universität Innsbruck, Sektion für Biomedizinische Physik
none
partner