TroposphereStratosphere coupling and its effect on Tropospheric Ozone. - PowerPoint PPT Presentation

Title: TroposphereStratosphere coupling and its effect on Tropospheric Ozone.


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Troposphere/Stratosphere coupling and its effect
on Tropospheric Ozone.
Richard Damoah and David Stevenson Institute of
Atmospheric and Environmental Science, University
of Edinburgh, UK Wenshou Tian and Martyn
Chipperfield Institute for Atmospheric Science,
School of Earth and Environment, University of
Leeds, UK
ABSTRACT
Coupled Model Mozaic Comparison
UMSTOCHEM SLIMCAT Results




JJA






Model Sondes Comparison
Sondes Mozaic Comparison
Coupling Species
The chemistry modules have been coupled by
exchanging relevant fields (O3, CH4, CO, NOx,
HNO3 and N2O5) in the overlapping UTLS region
(75-145 hPa) every 3 hours, and used in both the
photolysis schemes and for stratosphere-tropospher
e exchange (STE). At the start level (number 24
in the UM grid) 145 hPa, those fields in STOCHEM
overwrite SLIMCAT fields and at the upper most
level (number 30, 75 hPa), SLIMCAT fields
overwrite those from STOCHEM. A linearly weighted
average is then applied in between the two levels
(145 hPa and 75 hPa).
Model Mozaic Comparison