Supplementary material to "Influence of plant ecophysiology on ozone dry deposition: Comparing between multiplicative and photosynthesis-based dry deposition schemes and their responses to rising CO<sub>2</sub> level"

Abstract

In this study, we use four long-term measurement sites with hourly observations:(1) The Harvard Forest Environmental Measurement Site (referred to as Harvard Forest) located in central Massachusetts.We use a O3 EC flux dataset together with ambient O3 concentrations (Munger and Wofsy, 1999) from year 1992 to 2006 to derive vd. Observed ozone flux data was measured at a height of 29m at the EMS site since 1991 (dataset id: HF004). We use air density at 25ºC and 1010hPa to compute vd when temperature measurements are missing. Observed hourly vd values are removed if they are: (a) from days with more than 30% of missing hourly measurements are removed; (b) not fall within mean ± 3 standard deviations.(2) The Borden Forest Research Station (referred to as Borden Forest) is located in southern Ontario, Canada. We use a database of hourly vd from year 2008 to 2013 (Wu et al., 2016). Gs was computed using flux data from FLUXNET-Canada Dataset (TEAM, 2016). vd values were derived with a modified gradient method (MGM) which have been proved to agree well with eddy covariance measurements. Negative vd values and the same portion of positive vd values with highest ranking were removed.(3) The Blodgett Ameriflux site (referred to as Blodgett Forest) is located near Georgetown, California, US. The site is dominated by ponderosa pine, characterized by a Mediterranean climate. We use the dataset from Fare et al. ( 2010), which includes observed vd and Gs from year 2001 to 2007.(4) The SMEAR II field measurement station (System for Measuring Forest Ecosystem-Atmosphere Relationships II) is located in Hyytiälä Forest, southern Finland. We use quality-checked hourly O3 flux and concentrations for Hyytiälä Forest from year 2007 to 2010. The height of trees near measurement tower was about 14-18m from 2000 to 2010. We use O3 concentrations averaged from measurements at height 33.6m and 16.8m.