Annual Report 2012 - City University of Hong Kong

Figure 30. The number of exceedance of O 3 in Yuen
Long beyond 110 g/m 3
Reference:
Tu, J. Y., C. Chou, and P. S. Chu, 2009: The abrupt
shift of typhoon activity in the vicinity of Taiwan and
its association with western North Pacific–East Asian
climate change. J. Climate, 22, 3617–3628.
Lee, Y. C., G. Calori, P. Hills, and G. R. Carmichael, 2002: Ozone episodes in urban Hong Kong 1994-1999. Atmos.
Environ., 36, 1957-1968.
Lee, Y. C., A. Savtchenko, 2006: Relationship between Air Pollution in Hong Kong and in the Pearl River Delta Region
of South China in 2003 and 2004: An Analysis. J. Appl. Meteor. Climatol., 45, 269–282.
Yang, J. X., A.K.H. Lau, J.C.H. fung, W. Zhou, M. Wenig, 2012. An air pollution episode and its formation mechanism
during the tropical cyclone Nuri’s landfall in a coastal city of south China. Atmos. Environ., 54, 746-753.
D7. Regional climate change on future air quality in East Asia
(PI: Nicky YF LAM; CO-I: Francis TAM; CO-I: Wen ZHOU)
In this on-going work, the regional climate change and air quality
are simulated for investigating the future climate change under the
IPCC AR5 scenario (i.e., RCP8.5) using high-resolution numerical
models. We have carried out dynamical downscaling on Earth
System Model (CESM), for regional Weather Research Forecasting
(WRF) and Community Multi-scale Air Quality (CMAQ) models. An
example of simulated air quality (i.e., ozone) in the present climate
simulation is shown in Figure 31, where high average ozone
concentration is observed in the South China. Both climatological
and air pollution are simulated through a two-way coupling under the WRF-CMAQ framework. The resolutions of
the simulation reach 27 km for the entire area of Asia, and 9 km for Southern China, as shown in Figure 32. We will
examine the effects of aerosol feedback on future climate and how it affects the East Asian monsoon and heat wave.
Moreover, it will also look into the effect of future climate on future air quality in East Asia.).
Figure 31. Output (i.e., average ozone in October) from
CMAQ air quality simulation in present climate in ppbv
The implementation of WRF-CMAQ
coupled with CESM downscaling
has been completed. We will use
this system to examine the effects
of aerosol feedback on future
climate (i.e., IPCC AR5 scenarios) in
East Asia.
Figure 32. The study domain
33