Daily precipitation statistics in regional climate models: Evaluation and intercomparison for the European Alpsстатья из журнала
Аннотация: An evaluation is undertaken of the statistics of daily precipitation as simulated by five regional climate models using comprehensive observations in the region of the European Alps. Four limited area models and one variable‐resolution global model are considered, all with a grid spacing of 50 km. The 15‐year integrations were forced from reanalyses and observed sea surface temperature and sea ice (global model from sea surface only). The observational reference is based on 6400 rain gauge records (10–50 stations per grid box). Evaluation statistics encompass mean precipitation, wet‐day frequency, precipitation intensity, and quantiles of the frequency distribution. For mean precipitation, the models reproduce the characteristics of the annual cycle and the spatial distribution. The domain mean bias varies between −23% and +3% in winter and between −27% and −5% in summer. Larger errors are found for other statistics. In summer, all models underestimate precipitation intensity (by 16–42%) and there is a too low frequency of heavy events. This bias reflects too dry summer mean conditions in three of the models, while it is partly compensated by too many low‐intensity events in the other two models. Similar intermodel differences are found for other European subregions. Interestingly, the model errors are very similar between the two models with the same dynamical core (but different parameterizations) and they differ considerably between the two models with similar parameterizations (but different dynamics). Despite considerable biases, the models reproduce prominent mesoscale features of heavy precipitation, which is a promising result for their use in climate change downscaling over complex topography.
Год издания: 2003
Авторы: Christoph Frei, Jens Hesselbjerg Christensen, Michel Déqué, Daniela Jacob, Richard Jones, Pier Luigi Vidale
Издательство: American Geophysical Union
Источник: Journal of Geophysical Research Atmospheres
Ключевые слова: Climate variability and models, Meteorological Phenomena and Simulations, Cryospheric studies and observations
Другие ссылки: Journal of Geophysical Research Atmospheres (PDF)
Journal of Geophysical Research Atmospheres (HTML)
MPG.PuRe (Max Planck Society) (PDF)
MPG.PuRe (Max Planck Society) (HTML)
Journal of Geophysical Research Atmospheres (HTML)
MPG.PuRe (Max Planck Society) (PDF)
MPG.PuRe (Max Planck Society) (HTML)
Открытый доступ: bronze
Том: 108
Выпуск: D3