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Titolo:
CONTINENTAL BIOGENIC SPECIES IN THE GREENLAND ICE CORE PROJECT ICE CORE - TRACING BACK THE BIOMASS HISTORY OF THE NORTH-AMERICAN CONTINENT
Autore:
FUHRER K; LEGRAND M;
Indirizzi:
UNIV GIESSEN,INST PHYS 2,HEINRICH BUFF RING 14 D-35392 GIESSEN GERMANY CNRS,LAB GLACIOL & GEOPHYS ENVIRONM F-38402 ST MARTIN DHER FRANCE UNIV BERN,INST PHYS BERN SWITZERLAND
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C12, volume: 102, anno: 1997,
pagine: 26735 - 26745
SICI:
2169-9275(1997)102:C12<26735:CBSITG>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
YOUNGER DRYAS; NITROUS-OXIDE; FOREST-FIRES; POLAR ICE; RECORD; LAURENTIDE; AMMONIUM; CANADA; SULFUR; ACIDS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
K. Fuhrer e M. Legrand, "CONTINENTAL BIOGENIC SPECIES IN THE GREENLAND ICE CORE PROJECT ICE CORE - TRACING BACK THE BIOMASS HISTORY OF THE NORTH-AMERICAN CONTINENT", J GEO RES-O, 102(C12), 1997, pp. 26735-26745

Abstract

Ammonium, nitrate, and organic acid records from the Greenland Ice Core Project deep ice core are discussed. All species have a continentalbiogenic source that is situated predominantly on the North American continent for species deposited in Summit, central Greenland. The record therefore can be used to trace back the biomass history of the North American continent. Difficulty in the interpretation of these records arises from their unknown transfer behavior in a more alkaline atmosphere, which characterizes glacial time periods compared to interglacial stadials. This may have implications not only for weak acids such as formate and acetate, but also possibly for the transport and incorporation of HNO3 into aerosols, whereas ammonium is probably not affected by the alkalinity change of the atmosphere. Our approach is to compare samples with similar H+ concentrations throughout the record. From the records we infer several significant fluctuations in the extent ofthe Laurentide Ice Sheet during the last glaciation. We find evidenceagainst the occurrence of an extensive Younger Dryas event in North America.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 07:16:55