2021. szeptember 19. vasárnap
IDŐJÁRÁS - OMSZ angol nyelvű folyóirat

Vol. 122, No. 2 * Pages 101–216 * April - June 2018

Quarterly Journal of the Hungarian Meteorological Service

letöltés [pdf: 2538 KB]
Evaluation of ozone deposition models over a subalpine forest in Niwot Ridge, Colorado
Dalma Szinyei, Györgyi Gelybó, Alex B. Guenther, Andrew A. Turnipseed, Eszter Tóth, and Peter J.H. Builtjes
 PDF (2667 KB)   |   Abstract


In this study, we evaluated three conceptually similar ozone gas deposition models. These dry deposition models are frequently used with chemical transport models for calculations over large spatial domains. However, large scale applications of surface-atmosphere exchange of reactive gases require modeling results as accurate as possible to avoid nonlinear accumulation of errors in the spatially representative results. In this paper, model evaluation and comparison against measured data over a coniferous forest at Niwot Ridge AmeriFlux site (Colorado, USA) is carried out. At this site, no previous model calibration took place for any of the models, therefore, we can test and compare their performances under similar conditions as they would perform in a spatial application. Our results show systematic model errors in all the three cases, model performance varies with time of the day, and the errors show a pronounced seasonal pattern as well. The introduction of soil moisture content stress in the model improved model performance regarding the magnitude of fluxes, but the correlation between measured and modeled ozone deposition values remains low. Our results suggest that ozone dry deposition model results should be interpreted carefully in large scale applications, where the accuracy can vary with land cover sometimes are biased.

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