Contributions of World Regions to the Global Tropospheric Ozone Burden
Change from 1980 to 2010
We investigate the contributions of emission changes from 10 world
regions, as well as the global methane concentration change, on the
global tropospheric ozone burden change from 1980 to 2010. The modeled
global tropospheric ozone burden has increased by 28.1 Tg, with 26.7%
(7.5 Tg) of this change attributed to the global methane increase.
Southeast Asia (5.6 Tg) and South Asia (4.0) contribute comparably to
the global ozone burden change as East Asia (5.6), even though NO
emission increases in each region are less than one third of those in
East Asia, highlighting the greater sensitivity of global ozone to these
regions. Emission decreases from North America, Europe and Former Soviet
Union have led to ozone burden decreases of 2.8, 1.0, and 0.3 Tg. The
greater sensitivity of the global ozone burden to emission changes in
tropical regions emphasizes the importance of controlling emissions in
these regions for global ozone.