Hanwant B. Singh

TL;DR: In this paper, the authors present a characterization of the trace gases, taking into account the observed abundances, known sources, and sinks in the present-day atmosphere, and their potentials for climate changes.

TL;DR: In this article, the presence of high concentrations of acetone and methanol in the free troposphere has been reported, indicating that acetone photochemistry provides a quantitatively significant pathway for sequestering NOx in the form of peroxyacetylnitrate, a relatively unreactive temporary reservoir of NOx.

TL;DR: The tropospheric composition of oxygenated organic species is characterized, using data from a recent airborne survey conducted over the tropical Pacific Ocean, and it is suggested that oxygenated species could be formed via the oxidation of hydrocarbons in the atmosphere, the photochemical degradation of organic matter in the oceans, and direct emissions from terrestrial vegetation.

TL;DR: The NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission was conducted in two 3-week deployments based in Alaska (April 2008) and western Canada (June-July 2008) as discussed by the authors.

TL;DR: The photochemistry of the troposphere over the South Atlantic basin was examined by modeling of aircraft observations up to 12-km altitude taken during the TRACE A expedition in September-October 1992 as mentioned in this paper.