Robert B. Chatfield

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[1] Airborne measurements of a large number of oxygenated volatile organic chemicals (OVOC) were carried out in the Pacific troposphere (0.1–12 km) in winter/spring of 2001 (24 February to 10 April). Specifically, these measurements included acetone (CH3COCH3), methylethyl ketone (CH3COC2H5, MEK), methanol (CH3OH), ethanol (C2H5OH), acetaldehyde (CH3CHO),(More)
[1] We present the first directly retrieved global distribution of tropospheric column ozone from Global Ozone Monitoring Experiment (GOME) ultraviolet measurements during December 1996 to November 1997. The retrievals clearly show signals due to convection, biomass burning, stratospheric influence, pollution, and transport. They are capable of capturing(More)
The abundance of gas phase nitric acid in the upper troposphere is overestimated by global chemistry-transport models, especially during the spring and summer seasons. Recent aircraft data obtained over the central US show that mineral aerosols were abundant in the upper troposphere during spring. Chemical reactions on mineral dust may provide an important(More)
Results from the Intergovernmental Panel on Climatic Change (IPCC) tropospheric photochemical model intercomparison (PhotoComp) are presented with a brief discussion of the factors that may contribute o differences inthe modeled behaviors ofHO x cycling and the accompanying 03 tendencies. PhotoComp was a tightly controlled model experiment inwhich the IPCC(More)
One of the important science requirements of the Geostationary Coastal and Air Pollution Events (GEOCAPE)mission is to be able tomeasure ozonewith twodegrees of freedom in the troposphere and sensitivity in the lowest 2 km (lowermost troposphere, LMT), in order to characterize air quality and boundary layer transport of pollution. Currently available remote(More)
A combination of multiplatform satellite observations and statistical data analysis are used to improve the correlation between estimates of PM2.5 (particulate mass with aerodynamic diameter less that 2.5 microm) retrieved from satellite observations and ground-level measured PM2.5. Accurate measurements of PM2.5 can be used to assess the impact of air(More)
Satellite observations may improve the areal coverage of particulate matter (PM) air quality data that nowadays is based on surface measurements. Three statistical methods for retrieving daily PM2.5 concentrations from satellite products (MODIS-AOD, OMI-AAI) over the San Joaquin Valley (CA) are compared--Linear Regression (LR), Generalized Additive Models(More)
NASA’s technical excellence can be brought to fruition through a consistent, daily, global mapping of major IR-active and pollutant gases through the whole troposphere. This a mapping serves national needs to inform air-quality forecasting as well as to understand the accumulation of radiatively active trace gases, as well as the cleansing capacity of the(More)
Three cases of colovaginal fistulae were recently diagnosed and treated. Colovaginal fistulae are not commonly reported and their diagnosis may be difficult to make. Our cases presented with a complaint of vaginal discharge, history of hysterectomy, and diagnosis of diverticulosis. The diagnosis and treatment of colovaginal fistulae are discussed.