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TitreA zonally-averaged stable-isotope model coupled to a regional variable-elevation stable-isotope model
AuteurFisher, D A
SourceProceedings of the Symposium on Ice and Climate; par MacAyeal, D R (éd.); Annals of Glaciology vol. 14, 1990 p. 65-71, (Accès ouvert)
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 51090
ÉditeurCambridge University Press (CUP)
RéunionSymposium on Ice and Climate; Seattle, WA; US; août 21-25, 1999
Documentpublication en série
Mediapapier; en ligne; numérique
Formatspdf; html
Sujetsétablissement de modèles; isotopes d'oxygène; isotopes; etudes isotopiques; effets climatiques; précipitation; evaporation; temperature; géomathématique; géophysique
Illustrationsformulae; graphs
Diffusé2017 01 20
Résumé(disponible en anglais seulement)
A global model is presented that simulates zonal averages of stable isotopes delta(18O), delta(D) and precipitation rates at sea level. The model is empirical and uses as input zonal averages of evaporation, meridional water-vapour flux, air temperature, sea temperature, wind speed, relative humidity, sea-ice cover, and supersaturation in clouds as a function of temperature. The global model provides input to high-latitude regional solutions that are found integrating up assumed vapour trajectories, which need not be at sea level. Model precipitation rates, delta(18O) and delta(D), compare well to measured values on an annual and seasonal basis. The stable-isotope-temperature relation poleward of about 35° latitude as well as the isotope-precipitation relation in the tropics is simulated by the zonal global model. The Queen Elizabeth Islands stable-isotope pattern is given as an example of a regional solution of the model. Zonal moisture contributions for high-elevation sites are found to be different between northern hemisphere (Crête, Greenland) and southern hemisphere (Vostok, East Antarctica) with the southern high-latitude cold oceans making a larger relative contribution.