Ice Core Studies of Global Biogeochemical Cycles by L. A. Barrie (auth.), Robert J. Delmas (eds.)

By L. A. Barrie (auth.), Robert J. Delmas (eds.)

The research of polar ice cores has confirmed to be very instructive approximately earlier environmental stipulations at the time scale of a number of climatic cycles, and up to date drilling operations have supplied details of serious price for international swap issues.
The e-book offers the latest info extracted from Greenland ice cores and floor experiments and compares them with former Antarctic effects. It comprises history articles, unique contributions and crew experiences of curiosity to scientists, climatologists, atmospheric chemists, and glaciologists focused on worldwide swap research.

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1982 - Oct. 1982 Feb. 1975 - Dec. 1982 Period investigated Dito Harris & Bodhaine (1983) Bodhaine & DeLuisi (1985) Bigg & Ayers (1981) Voskresenskii (1968) Gras & Adriaansen (1985) Ito (1989) Jaenicke & Stingl (1984) Harris & Bodhaine (1983) Reference '" I\) 27 Figure I shows the seasonal variation of monthly mean concentration of Aitken particles observed at Antarctic stations. The concentration at Barrow, Arctic is also shown for comparison. Monthly mean concentration of Aitken particles in Antarctica shows a seasonal variation characterized by high concentration in sunlit months and low concentration in polar night months.

3). -.... -oroU--------.. ------. o o o - _ ...... -. --. o o 00 OUL~~~~LULULU~~~~~~~~~~~~ 250 300 350 LWC (In mg/m3) Fig. II). (1) where r cloud droplet radius, N number of droplets with radius ri , n number of droplet classes, e density of water. An increasing LWC may results from (a) rising droplet number at the same mean droplet radius and (b) increase of mean droplet radius at the same droplet number. An increase of the droplet number without change of the size distribution should not result in the change of liquid phase concentrations of impurities; because the droplet number and initial droplet radius is determined only by the number and individual size of CCN.

Particles in this sub-range have a relatively long residence time and consist mainly of aged particles that are observed widely in the global background troposphere. In this sense, the sub-range between 1(J-6 and 10"5 cm in radius may be called a background sub-range. The seasonal variation of size distribution was discussed by Ito (1985), based on Fig. 4, in conjunction with the result of the year-round observation of mean size of Aitken particles. Consequently, it is speculated that for the seasonal variation of size distribution, a mono-modal distribution with a mode in the background sub-range prevails in polar night months and a bimodal size distribution prevails in sunlit months.

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