An Evaluation of Climate Effects of Continental-scale Air Pollution in East Asia

Research Project , Research Report 2006


Teruyuki NAKAJIMA Center for Climate System Research, Univ. of Tokyo
Makiko MUKAI Center for Climate System Research, Univ. of Tokyo
Masahide KIMOTO Center for Climate System Research, Univ. of Tokyo
Masaaki TAKAHASHI Center for Climate System Research, Univ. of Tokyo
Akimasa SUMI Integrated Research System for Sustainability Science
Ryosuke SHIBASAKI Center for Spatial Information Science, Univ. of Tokyo
Kanji UEDA Research into Artifacts, Center for Engineering, Univ. of Tokyo
Yuichi OGAWA High Temperature Plasma Centerng, Univ. of Tokyo

Abstract

We compared observed-and model simulated-optical properties of aerosols in East Asia. The results showed that the aerosol optical thickness took values as large as 0.2 to 0.6 at wavelength of 550nm even in the outflow region of the East China Sea. The single scattering albedo took values as small as 0.9. These results were also fairly will simulated by our general circulation model. The model simulation has suggested that the airmass over the Okinawa region was significantly affected by aerosols transported from the Southern China and South East Asia regions. We also evaluated the annual change rate of the global solar radiation, which showed significantly large negative values with characteristic seasonal change patterns in Beijing and Wuhan. Numerical simulations with the general circulation mode and a mixed ocean model have shown that the direct effect of anthropogenic aerosols had a largest contribution to the decreased trend of the global solar radiation.

Keywords:

East Asia, Air pollution, Aerosol, Climate change, Global warming