Publications [#58490] of Prasad S Kasibhatla

Papers Published

1. Holloway, T. and Levy, H., II and Kasibhatla, P., Global distribution of carbon monoxide, J. Geophys. Res. (USA), vol. 105 no. D10 (2000), pp. 12123 - 47 [1999JD901173] .
   (last updated on 2007/04/09)

   Abstract:
   This study explores the evolution and distribution of carbon monoxide (CO) using the NOAA Geophysical Fluid Dynamics Laboratory three-dimensional global chemical transport model (GFDL GCTM). The work aims to gain an improved understanding of the global carbon monoxide budget, specifically focusing on the contribution of each of the four source terms to the seasonal variability of CO. The sum of all CO sources in the model is 2.5 Pg CO/yr (1 Pg=10³ Tg), including fossil fuel use (300 Tg CO/yr), biomass burning (748 Tg CO/yr), oxidation of biogenic hydrocarbons (683 Tg CO/yr), and methane oxidation (760 Tg CO/yr). The main sink for CO is destruction by the hydroxyl radical, and the authors assume a hydroxyl distribution based on three-dimensional monthly varying fields given by Spivakovsky et al. [1990], but they increase this field by 15% uniformly to agree with a methyl chloroform lifetime of 4.8 years [Prinn et al., 1995]. Their simulation produces a carbon monoxide field that agrees well with available measurements from the NOAA/Climate Monitoring and Diagnostics Laboratory global cooperative flask sampling network and from the Jungfraujoch observing station of the Swiss Federal Laboratories for Materials Testing and Research (EMPA) and flight data from measurement campaigns of the NASA Global Tropospheric Experiment. For all 34 ground-based measurement sites the authors have calculated the percentage contribution of each CO source term to the total model-simulated distribution and examined how these contributions vary seasonally due to transport, changes in OH concentration, and seasonality of emission sources

   Keywords:
   air pollution;atmospheric chemistry;atmospheric composition;carbon compounds;troposphere;