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Titolo:
Impact of ozone layer depletion II: changes in photodissociation rates andtropospheric composition
Autore:
De Winter-Sorkina, R;
Indirizzi:
Univ Utrecht, Inst Marine & Atmospher Res Utrecht, IMAU, NL-3508 TA Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3508 TA 3508 TA Utrecht, Netherlands
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 9, volume: 35, anno: 2001,
pagine: 1615 - 1625
SICI:
1352-2310(2001)35:9<1615:IOOLDI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE ULTRAVIOLET-RADIATION; STRATOSPHERIC OZONE; UV; TRENDS; PHOTOCHEMISTRY; ATMOSPHERE; CHEMISTRY; AEROSOLS; DECREASE; RADICALS;
Keywords:
ozone trends; UV radiation; OH radical; tropospheric ozone; carbon monoxide;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: De Winter-Sorkina, R Univ Utrecht, Inst Marine & Atmospher Res Utrecht, IMAU, POB 80005, NL-3508 TA Utrecht, Netherlands Univ Utrecht POB 80005 Utrecht Netherlands NL-3508 TA
Citazione:
R. De Winter-Sorkina, "Impact of ozone layer depletion II: changes in photodissociation rates andtropospheric composition", ATMOS ENVIR, 35(9), 2001, pp. 1615-1625

Abstract

Seasonal trends in the ozone profile determined from the Nimbus-7 TOMS total ozone record and SAGE trends are used to estimate the trends in tropospheric photodissociation rates. The resultant photodissociation trends for tropospheric ozone, CH3CHO, HNO3, HNO4 and CH2O are presented. A three-dimensional chemical transport model is used to investigate the impact of changing photodissociation rates on tropospheric composition. First, the 'linear trend' method is applied. The trends in OH, tropospheric ozone, carbon monoxide, methane and NOx due to anthropogenic stratospheric ozone depletion areestimated from the trends in photodissociation rates assuming a mean stratospheric ozone seasonal cycle. Total ozone trends are reduced by their 2 sigma error estimates to exclude the influence that measurement errors and interannual natural variations in stratospheric ozone may have on trends in tropospheric composition. The resulting lower limits of trends in tropospheric composition due to anthropogenic ozone depletion over the time period 1978-1993 are presented at a 95% confidence level. Second, the TOMS total ozone record is used to calculate via parameterization the temporal dependenceof tropospheric photodissociation rates within the chemical transport model and to identify the resulting trends in tropospheric composition. The trends in OH, O-3, CO, NOx and CH4 determined from the TOMS total ozone recordagree with the trends from the 'linear trend' method within the 2 sigma error limits. (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 02/04/20 alle ore 18:29:08