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Dr. Meiyun Lin (Princeton University/CICS Scientist)

Office: 250 GFDL  Tel: (609) 452-6551   Email:

Meiyun Lin is a research scientist at NOAA and Princeton University's Cooperative Institute for Climate Science (CICS). Lin is also an investigator of the NASA Aura Sciences Team in Atmospheric Composition and the NASA Air Quality Applied Sciences Team. Lin's research seeks to advance knowledge on the interactions of air quality with weather and climate. Specifically, she investigates how climate variability & change, long-range transport of Asian pollution, and intrusions of stratospheric ozone deep into the troposphere affect U.S. ozone air quality on time scales ranging from days to decades. The U.S. Environmental Protection Agency is proposing to lower the National Ambient Air Quality Standard (NAAQS) for ground-level ozone from 75 ppbv to 65-70 ppbv. Process-level understanding of sources of U.S. surface ozone is thus relevant to an effective implementation of the national standard. 

Citations: | | GFDL Bibliography


Logo Tropospheric ozone: Decadal dynamics
  > Article by Meiyun Lin et al. in Nature Geoscience
  > Nature Geoscience News & Views

Tropospheric ozone is a greenhouse gas, biological irritant, and significant source of highly reactive hydroxyl radicals. The response of tropospheric ozone to changing atmospheric circulation is poorly understood. This paper shows that over the past four decades, shifts in atmospheric circulation have played a key role in the autumnal ozone increase and the absence of spring ozone change over Hawaii by modulating pollution transport from Asia. This finding implies a need to consider decade-long variability in climate when detecting and attributing trends in tropospheric ozone levels to changes in human-induced emissions.   
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Springtime high-ozone events in Western U.S. surface air: Role of stratospheric intrusions.
  > Article by Meiyun Lin et al. in J. Geophys. Res. 

Current guidelines from the U.S. Environmental Protection Agency (EPA) dictate that surface-level air should have no more than 75 ppbv of ozone for 8-hour average. Lin et al [2012] find that intrusions of ozone from the stratosphere can episodically increase surface ozone levels by 20-40 ppbv, pushing observed ozone to exceed the health-based limit at western U.S. high-altitude regions during spring. This finding suggests that stratospheric influence may pose challenges for western states to achieve more stringent ozone air quality standards if such "exceptional events" beyond the control of domestic air agencies are not properly screened out. 

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Logo Western U.S. Air Quality: Imported ozone pollution
  >Article by Meiyun Lin et al. in J. Geophys. Res. 

As Asian countries develop, they are emitting more ozone precursors that pollute surface-level air. The authors find that Asian pollution can contribute as much as 20% of total ozone during springtime pollution episodes observed in western U.S. surface air. They suggest that we could use NASA satellite observations of carbon monoxide to predict when incoming plumes of polluted air might affect western air quality, one to three days ahead of time. (Read more...)

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Publicity:  Science Magazine ; Nature News; AGU Editors' Highlight
                 JGR's top 1 most cited article in year 2012