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Titolo:
INVESTIGATING THE SENSITIVITY OF THE ATMOSPHERIC GENERAL-CIRCULATION MODEL ECHAM-3 TO PALEOCLIMATIC BOUNDARY-CONDITIONS
Autore:
LORENZ S; GRIEGER B; HELBIG P; HERTERICH K;
Indirizzi:
UNIV BREMEN,FACHBEREICH 5,GEOWISSENSCH D-28334 BREMEN GERMANY UNIV BREMEN,FACHBEREICH 5,GEOWISSENSCH D-28334 BREMEN GERMANY
Titolo Testata:
Geologische Rundschau
fascicolo: 3, volume: 85, anno: 1996,
pagine: 513 - 524
SICI:
0016-7835(1996)85:3<513:ITSOTA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAST GLACIAL MAXIMUM; LONG-TERM VARIATIONS; SURFACE ALBEDO; SOLAR-SYSTEM; CLIMATE; ICE; ECMWF; COVER;
Keywords:
ATMOSPHERIC RESPONSE; GENERAL CIRCULATION MODELS; GLACIAL MAXIMUM; MILANKOVITCH THEORY; PALEOCLIMATE; CLIMATE OPTIMUM; GLACIAL INCEPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
S. Lorenz et al., "INVESTIGATING THE SENSITIVITY OF THE ATMOSPHERIC GENERAL-CIRCULATION MODEL ECHAM-3 TO PALEOCLIMATIC BOUNDARY-CONDITIONS", Geologische Rundschau, 85(3), 1996, pp. 513-524

Abstract

We present atmospheric simulations of three different time slices of the late Quaternary using the ECHAM 3 general circulation model in T42resolution. In this work we describe the results of model runs for the time slices 6000 years BP (last climate optimum), 21 000 BP (last glacial maximum) and 115 000 years BP (glacial inception). Although the solar insolation is known for all time slices, a complete data set of the other boundary conditions which are necessary for running the atmospheric model exists only for the last glacial maximum in the form of the CLIMAP reconstruction. For the other two time slices, which are interglacial states like the modern climate, sea surface temperatures, land albedo and ice sheet topography are kept at modern values and onlythe solar insolation is changed appropriately. The response of the model to solar insolation changes is quite reasonable. The modelled anomalies are small and roughly opposite in sign for 6000 BP and 115 000 BP, respectively. In the case of last glacial maximum, the glacial ice sheet topography and ice albedo produce a much larger climate anomaly in the model. However, to enable a real test of model performance under glacial boundary conditions, the CLIMAP sea surface temperatures, which are now known to be partly inaccurate, should be replaced by an updated ''state-of-the-art'' reconstruction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 15:54:13