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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. Lin is also an investigator of NASA Aura Sciences in Atmospheric Composition (2014-present) and the NASA Air Quality Applied Sciences Team (2011-present). Lin's research explores the interactions of air quality with weather and climate to inform public policy. Specifically, she investigates how long-range transport of Asian pollution, intrusions of stratospheric ozone deep into the troposphere, and climate variability and change affect U.S. ozone air quality on daily to decadal time scales. The U.S. Environmental Protection Agency is proposing to lower the National Ambient Air Quality Standard for ozone from 75 ppbv to 60-70 ppbv. Process-level understanding of sources of ozone from daily to multi-decadal time scales is thus relevant to an effective implementation of the ozone NAAQS. Advancing this knowledge might help in designing effective emission controls to achieve a targeted level of air quality and in projecting surface ozone levels under future climate scenarios. 

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

Tropospheric ozone is a potent greenhouse gas, biological irritant, and significant source of highly reactive hydroxyl radicals. 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 precursor emissions.   

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Publicity: Princeton Journal Watch | ScienceDaily | other media outlets

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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Publicity: JGR most popular articles; US House Environmental Hearing;

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