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The impacts of summer monsoons on the ozone budget of the atmospheric boundary layer of the Asia-Pacific region

ByXueweiHou, Bin Zhu, etcMarch 01,2016
The impacts of summer monsoons on the ozone budget of the atmospheric boundary layer of the Asia-Pacific region
The impacts of summer monsoons on the ozone budget of the atmospheric boundary layer of the Asia-Pacific region
XueweiHou1,2, Bin Zhu1,2*, Dongdong Fei1, and Dongdong Wang1,2
1.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, 210044, China
2.Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China 
*Corresponding author:
Phone: 0086-2558699785
binzhu@nuist.edu.cn
 
Abstract
The seasonal and inter-annual variation of ozone (O3) in the atmospheric boundary layer of the Asia-Pacific Ocean was investigated using model simulations (2001-2007) from the Model of Ozone and Related chemical Tracers, version 4 (MOZART-4). The simulated O3 and diagnostic precipitation are in good agreement with the observations. Model results suggest that the Asia-Pacific monsoon significantly influence the seasonal and inter-annual variation of ozone. The differences of anthropogenic emissions and zonal winds in meridional directions cause a pollutants’ transition zone at approximately 20°-30°N. The onset of summer monsoons with a northward migration of the rain belt leads the transition zone to drift north, eventually causing a summer minimum of ozone to the north of 30°N. In years with an early onset of summer monsoons, strong inflows of clean oceanic air lead to low ozone at polluted oceanic sites near the continent, while strong outflows from the continent exist, resulting in high levels of O3 over remote portions of the Asia-Pacific Ocean. The reverse is true in years when the summer monsoon onset is late.
 
Keywords: Tropospheric ozone, transition zone, Asia-Pacific monsoon
 
Access the studies below:
http://www.sciencedirect.com/science/article/pii/S0048969714013977