By Hans R. Pruppacher (auth.), S. I. Rasool (eds.)
About 3 years in the past Catherine de Berg and that i released a brief article in Nature during which we tried to provide an explanation for why the chemistry of the ambience of the Earth is at the present time so totally different from that of our neighbor ing planets, Mars and Venus. Our surroundings consists regularly of N2 and O with strains of A, H0, CO , zero , and so on. , whereas the atmospheres of either 2 2 2 three Mars and Venus are nearly fullyyt made from CO , additionally, the Earth seems to be 2 to be the single one ofthe 3 planets which has oceans ofliquid water at the floor. because the presence of liquid water on the earth is maybe a necessary requirement for all times to have originated and developed to its current country, the query of the obvious absence ofliquid water on Mars and Venus abruptly acquires major proportions. In our paper in Nature, and later in a extra precise dialogue of the topic (Planetary Atmospheres, in Exobiology, edited through C. Ponnamperuma, North Holland Publishing Co. ), we attempted to explain why we think that during the early historical past of the sunlight approach all of the terrestrial planets misplaced the atmospheres of H2 and He which that they had bought from the sun nebula on the time in their formation. those planets, thoroughly without atmos pheres, just like the Moon this day, began collecting new gases which have been exhumed from the internal by means of the graduation of volcanic activity.
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Extra info for Chemistry of the Lower Atmosphere
Sci. :!! l w I 6 4 2 o Fig. 12. 75 % supersaturation . Broken line: over the plains of Colorado (USA); full line: over the Caribbean Sea (I mg air = 1 cm 3 at 20·C and 840mb). (By courtesy of J. Atmas. Sci. ) had been over land for several days. Evidence that the contrast between the CCN concentration in continental and maritime air masses, which is very prominent near the earth's surface, decreases steadily with height was given by Squires and Twomey . 75 % over Colorado (U. ) and the Caribbean Sea are reproduced in Fig.
Furthermore, most metal oxides exhibited a much poorer ice-forming capability when they were submerged in the supercooled water drops than when they initiated the ice phase directly from the vapor. Recently, numerous investigators concerned themselves with the question whether anthropogenic combustion products could serve as efficient IFN. It has been known for some time that lead iodide (PbI 2) particles act as excellent IFN with a threshold temperature of about - 6°C. It also has been known for some time that aerosols of urban areas contain considerable amounts of lead.
12. 75 % supersaturation . Broken line: over the plains of Colorado (USA); full line: over the Caribbean Sea (I mg air = 1 cm 3 at 20·C and 840mb). (By courtesy of J. Atmas. Sci. ) had been over land for several days. Evidence that the contrast between the CCN concentration in continental and maritime air masses, which is very prominent near the earth's surface, decreases steadily with height was given by Squires and Twomey . 75 % over Colorado (U. ) and the Caribbean Sea are reproduced in Fig.