Indicator Code: OZONE_E
Objective: Ecosystem Vitality
Policy Category: Ecosystem Impacts of Atmospheric
Subcategory: Air Pollution (Effects on Environment)
Indicator Short Name: Regional Ozone
Indicator Full Name: Regional Ozone with Effects on Ecosystem
Indicator Description: An accumulated exposure concentration over a threshold of 40ppb in daylight time of growing season
Units: Exceedance square-kilometer-hours per square kilometer
Country Coverage: 223
Reference Year: 2000
Target: 0 exceedance above 3000 ppb.h
Target Source: Expert Judgment
Short Source: MOZART-2 Global Chemical Tracer Model, 2000
Source: Ozone concentrations data: MOZART-2 Global Chemical Tracer Model, The National Center for Atmospheric Research (NCAR)
Source URL: http://gctm.acd.ucar.edu/mozart/models/m2/index.shtml
Methodology: The ecological ozone measure was calculated using MOZART-2 data using the following method:
1) We assigned latitudes>0 to the northern hemisphere and latitudes<=0 to the southern
2) We assigned daylight hours to each band of latitude using information on sunrise and sunset times at http://aa.usno.navy.mil/data/docs/RS_OneYear.php
3) We subset the database to include only summer daylight hours (June-August in the north and December-February in the south)
4) We summed exceedances above 40 ppb.
5) We multiplied exceedance sums by land area, for each grid cell.
6) Using zonal statistics, we summed these exceedance-square kilometer products by country.
7) We divided these sums by total country area.
Additional Citations: Horowitz, L., et al., A global simulation of tropospheric ozone and related tracers: Description and evaluation of MOZART, version 2, J. Geophys. Res., 108(D24), 4784, doi:10.1029/2002JD002853, 24 December 2003.
International Cooperative Programme on Effects of Air Pollution on Natural Vegetation and Crops. 2007. AOT40 – The Parameter Used to Represent the Accumulated Dose of Ozone. Available at:http://icpvegetation.ceh.ac.uk/8AOT40.htm