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Titolo:
Significance of water complexes in the atmosphere
Autore:
Headrick, JE; Vaida, V;
Indirizzi:
Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 Chem & Biochem, Boulder, CO 80309 USA
Titolo Testata:
PHYSICS AND CHEMISTRY OF THE EARTH PART C-SOLAR-TERRESTIAL AND PLANETARY SCIENCE
fascicolo: 7, volume: 26, anno: 2001,
pagine: 479 - 486
SICI:
1464-1917(2001)26:7<479:SOWCIT>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR PREDISSOCIATION DYNAMICS; SOLAR-RADIATION; EARTHS ATMOSPHERE; BONDED COMPLEXES; COLLISION PAIRS; METHYL-IODIDE; VAPOR DIMERS; AB-INITIO; ABSORPTION; SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Vaida, V Univ Colorado, Dept Chem & Biochem, Campus Box 215, Boulder, CO 80309 USA Univ Colorado Campus Box 215 Boulder CO USA 80309 r, CO 80309 USA
Citazione:
J.E. Headrick e V. Vaida, "Significance of water complexes in the atmosphere", PHYS CH P C, 26(7), 2001, pp. 479-486

Abstract

Using standard statistical and thermodynamic procedures, we calculate equilibrium constants for the formation of select, hydrogen-bonded water complexes, namely the water dimer and the cyclic trimer and tetramer, and use them to estimate the atmospheric abundances of these species. We generate water complex altitude profiles (0-30 km) for both a saturated and an unsaturated atmosphere and discuss the dominant factors influencing our results. In our analysis, particular emphasis is given to the significance that water monomer concentrations, complex binding energies, hydrogen-bond energies, and entropy have on the calculated abundance profiles. We examine the importance of enthalpy and entropy at atmospheric temperatures and show how each contributes to our calculated equilibrium constants. By applying a universal2 degreesC temperature increase throughout the troposphere and lower stratosphere, we are able to model the effect that global warming would have on (H2O)(n) abundances in a saturated atmosphere. We also illustrate the effect that this thermal variation would have on entropy, enthalpy, and K-p(T) values. Based on our results, we assess the atmospheric significance of water dimers and cyclic water complexes. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:43:21