Robert J. Delmas

TL;DR: An automatic wet-only precipitation collector was operated in the coastal forest of equatorial Congo for a complete seasonal cycle (November 1986 to September 1987) Inorganic (Na+, K+, NH4+, Ca++, NO3−, Cl−, SO4=) and organic (HCOO−, CH3COO−) ions were determined in 169 samples which represent 51 rain events as discussed by the authors.

TL;DR: In this article, the simultaneous determination of major impurities present in Antarctic snow and ice at ng g − (ppb) concentrations by ion chromatography is described, and the results provide evidence against the validity of published sets of concentration data for nitrogen-containing compounds (NO − 3 and NH + 4 in Antarctica snow, and demonstrate a crucial contamination problem in the determination of ammonium ions.

TL;DR: In this paper, surface ozone measurements obtained at Brazzaville, Congo (4°20′S, 15° 20′E) from 1983 to 1986 are summarized and the results from aircraft surveys (1985 and 1986) from Brazzavanille to the Atlantic coast and results from a shipboard expedition (1986) along the Atlantic Coast at the Equator are presented.

TL;DR: In this paper, the authors compared electrical conductivity, sulfate, and acidity measurements for finding volcanic acid deposits in snow and ice cores and found that volcanic sulfuric acid in snow is not even partially neutralized by ammonia.

TL;DR: In this paper, the oxygen isotopic composition of sulfate in eight samples from the Vostok, Antarctica ice core, covering one full climate cycle, is presented, assuming tropospheric-derived sulfate only, isotope data reveal that the ratio of gas-phase over aqueous phase oxidation of S(IV) species was greater during the last glacial than the surrounding interglacial periods.