Download Atmospheric Aerosols: Life Cycles and Effects on Air Quality by Claudio Tomasi, Sandro Fuzzi, Alexander Kokhanovsky PDF

By Claudio Tomasi, Sandro Fuzzi, Alexander Kokhanovsky

The e-book describes the morphological, actual and chemical homes of aerosols from quite a few common and anthropogenic resources to assist the reader larger comprehend the direct function of aerosol debris in scattering and soaking up brief- and long-wave radiation.

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Extra info for Atmospheric Aerosols: Life Cycles and Effects on Air Quality and Climate

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As mentioned earlier, smoke aerosols contain a large fraction of soot substances. 2 μm. As mentioned previously, soot particles are often assembled in chain-like structures. 5, therefore considerably higher than those typical of maritime, mineral dust, and secondary water-soluble aerosols. Several million grams of particles can be released by the burning of one tropical forest hectare (104 m2 ). On a global scale, SMIC (1971) estimated that forest fires and slash-burning debris contributed to give a global annual average production flux of aerosol particle mass varying from 3 to 150 Tg per year, with the fraction of forest fire smoke particles with a < 20 μm that provides a value of Φe not exceeding 50 Tg per year (United Nations, 1979).

Some of these drops subsequently evaporate and leave behind sea-salt particles with a > 2 μm, containing not only sea salts but also organic compounds and bacteria that are already present in the surface layer of the ocean. This is due to the fact that the surface microlayer of the ocean is enriched in microorganisms, viruses, and extracellular biogenic material, which can enter the atmosphere through such a bubble bursting mechanism. Consequently, sea-salt particles usually contain about 10% organic matter (OM) (Middlebrook, Murphy, and Thomson, 1998), but currently it is not well known whether these biogenic constituents are internally mixed with sea salt or whether they also form agglomerate pools of externally mixed organic particles (Bigg and Leck, 2008).

8 SEM images of aerodiffuse biological particles sampled at rural sites of the Po Valley (northern Italy): (a) pollen of Ambrosia sp. (Po Valley), (b) pollen of Convolvulaceae sp. ) (Po Valley), (d) pollen of (f) 2 μm Castanea sativa sp. (Po Valley), (e) pollen of Liliaceae sp. (Po Valley), and (f ) fungus spore of Ustilago sp. (Po Valley). ). 21 22 1 Primary and Secondary Sources of Atmospheric Aerosol oceanic microorganism sampled at Cape Grim with sizes of ∼1 μm and biogenic debris consisting of several plant fragments collected at a rural site in Hungary, with sizes varying from 2 to 10 μm.

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