Characteristics of Antarctic stratospheric aerosols during the 1987 ozone depletion episode based on SAGE II satellite observations
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Lin, N.-H.↗
Engineering topics
Saxena, V. K.
Publications and source records attributed to Saxena, V. K..
Stratospheric ozone depletion over Antarctica - Role of aerosols based on SAGE II satellite observations
The physical characteristics of the Antarctic stratospheric aerosol are investigated via a comprehensive analysis of the SAGE II data during the most severe ozone depletion episode of October 1987. The aerosol size distribution is found to be bimodal in several instances using the randomized minimization search technique, which suggests that the distribution of a single mode may be used to fit the data in the retrieved size range only at the expense of resolution for the larger particles. On average, in the region below 18 km, a wavelike perturbation with the upstream tilting for the parameters of mass loading, total number, and surface area concentration is found to be located just above the region of the most severe ozone depletion.
Lin, N.-H.↗
Temporal and vertical distribution of acidity and ionic composition in clouds - Comparison between modeling results and observations
Cyclic temporal variations of pH and ionic concentration in sampled clouds which traversed the Mt. Mitchell State Park (North Carolina) site during the summers of 1986, 1987, and 1988 are reported. These clouds typically had a measured pH minimum during their initial and final stages. The cause of this basic cylic pattern is attributed to sampling at different vertical levels of the cloud. This is substantiated by visual observations made while sampling. The results also suggest that the measured pH patterns do not always exhibit minima during the formative and dissipative stages of the cloud, apparently in response to the underlying dynamical processes. The relationship between temporal pH measurements made at a stationary site to vertical cloud levels provides insights into the physical processes (e.g., nucleation scavenging near cloud base, dry air entrainment near cloud top) influencing the observed cloud-water chemistry on a real-time basis and would improve cloud chemistry models.
Defelice, T. P.↗
Microphysics of polar stratospheric clouds
Theoretical research on the microphysics of polar stratospheric clouds (PSCs) is reviewed. Problems discussed include microphysical features of PSCs, the Antarctic ozone depletion, and a comparison of PSC microphysical characteristics with those of low-level polar stratus clouds over the Antarctic coast.
Saxena, V. K.↗