Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 8 2009 10.5194/bg-6-1783-2009 http://www.biogeosciences.net/6/1783/2009/ http://www.biogeosciences.net/6/1783/2009/bg-6-1783-2009.html http://www.biogeosciences.net/6/1783/2009/bg-6-1783-2009.pdf 1783 1798 2009-08-26 Interactions among vegetation and ozone, water and nitrogen fluxes in a coastal Mediterranean maquis ecosystem G. Gerosa giacomo.gerosa@unicatt.it A. Finco S. Mereu R. Marzuoli A. Ballarin-Denti Dip. to di Matematica e Fisica, Università Cattolica del S.C., via Musei 41, 25121 Brescia, Italy CRINES, via Galilei 2, Curno, Italy Dip. to di Biologia Vegetale, Università La Sapienza, via Fermi 1, Rome, Italy Ozone, water and energy fluxes were measured over a Mediterranean maquis ecosystem from 5 May until 31 July 2007 by means of the eddy covariance technique. Additional measurements of NOx fluxes were performed by the aerodynamic gradient technique. Stomatal ozone fluxes were obtained from water fluxes by a Dry Deposition Inferential Method based on a big leaf concept. The maquis ecosystem acted as a net sink for ozone. The different water availability between late spring and summer was the major cause of the changes observed in stomatal fluxes, which decreased, together with evapotranspiration, when the season became drier. NOx concentrations were significantly dependent on the local meteorology. NOx fluxes resulted less intense than the ozone fluxes. However an average upward flux of both NO and NO2 was measured. The non-stomatal pathways of ozone deposition were investigated. A correlation of non-stomatal deposition with air humidity and, in a minor way, with NO2 fluxes was found. Ozone risk assessment was performed by comparing the exposure and the dose metrics: AOT40 (Accumulated dose over a threshold of 40 ppb) and AFst1.6 (Accumulated stomatal flux of ozone over a threshold of 1.6 nmol m−2 s−1). 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