Recent Research

 

Log of Principle Ozone Production Rate on a log contour scale, corresponding to values of 0.1 to 16 ppb/hour.  For a large sample of smog data, we find that j x [HCHO], where j is a UV photolysis rate, and [NO] have considerable explanatory power describing the observed production of ozone:  j x [HCHO] describes the production of HOO radicals, and [NO] describes the efficiency of conversion of the HO2 radicals to fresh ozone. The use of logarithmic emphasizes that the contours of ozone production based on the flux of carbon, j x [HCHO], and the concentration [NO] approximately form a relationship j x [HCHO] x [NO] = constant.

Controls on Pollution Ozone Production Measurable from Surface, Aircraft, and Satellite Monitors

Submitted to Geophysics Research Letters, April, 2008

Abstract (html)

Publication (pdf)

 

Supplementary Material for Controls on Pollution Ozone Production

Publication (pdf)



No-Plume-Rise parameterization (NPR) and Plume-Rise parameterization  (PR) simulations, shown additional transport of a biomass burning  pollutant, CO, to the global atmosphere.  Radiatively active trace materials such as smoke and smoggy ozone will similarly be transporte more actively  into the global atmosphere.

Modeling the Effect of Plumerise on the Transport of Carbon Monoxide  over Africa and Its Exports with NCAR CAM

H. Guan, R. B. Chatfield, S. R. Freitas, R. W. Bergstrom, and K. M.  Longo


Submitted to Atmospheric Chemistry and Physics (Discussions).

Abstract (html)
Publication (pdf)


Mechanisms for the intraseasonal variability of tropospheric ozone over the Indian Ocean during the winter monsoon

Chatfield, R. B., H. Guan, A. M. Thompson, and H. G. J. Smit (2007)

J. Geophys. Res. 112, D10303, doi:10.1029/2006JD007347

Abstract (html)

Publication (pdf)


IONS-04 (INTEX Ozonesonde Network Study, 2004): Perspective on Summertime
UT/LS (Upper Troposphere/ Lower Stratosphere) Ozone over Northeastern North America

Abstract (html)
Publication (pdf)

Mechanisms for the Intraseasonal Variability of the Tropospheric Ozone during the Indian Winter Monsoon

Abstract (html)

Publication (submitted), pdf
Movie, Qt
Movie, animated GIF

Convective lofting links Indian Ocean air pollution to paradoxical South Atlantic ozone maxima

Abstract (html)

Publication (pdf)

Monitoring the transport of biomass burning emissions in South America

Abstract (html)

Publication (pdf)


Impact of acetone on production and OH in the upper troposphere at high NOx

Abstract (html)

Publication (pdf)

A general model of how fire emissions and chemistry produce african/oceanic plumes (O3, CO, PAN, smoke) in TRACE A

Abstract (html)

Publication (pdf)


The subtropical global plume in the Pacific Exploratory Mission-Topics A(PEM-Tropics A), PEM-Tropics B, and the Global Atmospheric Sampling Program (GASP): How tropical
emissions affect the remote Pacific


Abstract (html)

Publication (pdf)


Anomalous HNO3/NOx ratio of remote tropospheric air. Conversion of nitric acid to formic acid and NOx ?

Abstract (html)

Publication (pdf)