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Titolo:
RELATIONSHIP BETWEEN CHEMISTRY OF AIR, FRESH SNOW AND FIRN CORES FOR AEROSOL SPECIES IN COASTAL ANTARCTICA
Autore:
WOLFF EW; HALL JS; MULVANEY R; PASTEUR EC; WAGENBACH D; LEGRAND M;
Indirizzi:
BRITISH ANTARCTIC SURVEY,NAT ENVIRONM RES COUNCIL,HIGH CROSS,MADINGLEY RD CAMBRIDGE CB3 0ET ENGLAND LAB GLACIOL & GEOPHYS ENVIRONM F-38402 ST MARTIN DHER FRANCE UNIV HEIDELBERG,INST UMWELTPHYS D-69120 HEIDELBERG GERMANY
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D9, volume: 103, anno: 1998,
pagine: 11057 - 11070
Fonte:
ISI
Lingua:
ENG
Soggetto:
GREENLAND ICE-SHEET; SEASONAL-VARIATIONS; SAMPLING PROGRAM; DRY DEPOSITION; SIMPLE-MODEL; DYE-3 GAS; PENINSULA; SUMMIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
E.W. Wolff et al., "RELATIONSHIP BETWEEN CHEMISTRY OF AIR, FRESH SNOW AND FIRN CORES FOR AEROSOL SPECIES IN COASTAL ANTARCTICA", J GEO RES-A, 103(D9), 1998, pp. 11057-11070

Abstract

Aerosol and fresh snow concentrations have been determined at three coastal Antarctic stations, Dumont d'Urville, Halle), and Neumayer. Model estimates suggest that dry deposition, including that caused by wind pumping, is only a minor contributor (of order 1%) to chemical fluxes at these sites with relatively high snow accumulation. Larger dry deposition fluxes are possible for very large aerosol particles, including sea-salt aerosol. Measurements of surface snow on successive days provide experimental data that constrain the contribution of dry deposition to probably less than 10% of annual fluxes for all ions, althoughvery high episodic fluxes of giant sea-salt aerosol cannot be ruled out. Spatial variability, and frequent snow, fog and drift events, makeit difficult to improve this quantification. Both theory and measurement suggest that fog deposition is also a minor contributor to the annual flux (probably <1%). Sublimation of surface snow and of blowing snow may increase snow concentrations by a few percent, with a larger role in summer, but should not affect fluxes. Wet deposition in falling snow appears to be by far the major contributor. However, the relationship between concentrations ih snow and iri simultaneously sampled aerosol at ground level was poor for most species. Scavenging ratios derived from these data are higher than those from the limited data previously available, but have huge uncertainties associated with them, Particularly at sites with frequent drifting snow, ground-level aerosol measurements may be inappropriate for deriving scavenging ratios. Despite this, there is a general seasonal coincidence of high aerosol concentrations and high snow concentrations. We are also able to trace the chemistry of fresh snowfall to an ice core collected up to 2 years later. Although some major snowfall event's may be missing, it seems that,as expected, there is no significant postdepositional modification ofchemistry for aerosol species in the top meter of firn.

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Documento generato il 10/04/20 alle ore 15:29:39