Mid-winter lower stratosphere temperatures in the Antarctic vortex: comparison between observations and ECMWF operational model. M. C. Parrondo, M. Yela, M. Gil, P. von der Gathen, and H. Ochoa Instituto Nacional de Técnica Aeroespacial, Torrejón de Ardoz, Spain Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Germany Dirección Nacional de Antártico, Buenos Aires, ...

Evaluation of ECMWF ERA-40 temperature and wind in the lower tropical stratosphere since 1988 from past long-duration balloon measurements T. Christensen, B. M. Knudsen, J.-P. Pommereau, G. Letrenne, A. Hertzog, F. Vial, J. Ovarlez, and M. Piot Danish Meteorological Institute, Copenhagen, Denmark Service d’Aéronomie, IPSL/CNRS, Verrières-Le-Buisson, France Centre National d’Études Spatiales, To...

averaged winter season systematic initial tendency errors for temperature tendencies [K/s] based on eight years (1982-89) of ERA assimilations using the slow normal mode insertion (SNMI) technique (uper cross section) and using the simple nudging technique (lower cross section). Figure 1 from the paper: Diagonsis of systematic initial tendency errors in an atmospheric AGCM using slow normal mod...

The relationship between storms and extreme ocean waves in the North Sea is assessed using a long-period wave data set and storms identified in the Interim ECMWF Re-Analysis (ERA-Interim). An ensemble sensitivity analysis is used to provide information on the spatial and temporal forcing from mean sea-level pressure and surface wind associated with extreme ocean wave height responses. Extreme o...

The concept of the ‘‘Asian monsoon’’ masks the existence of two separate summer rainfall régimes: convective storms over India, Bangladesh, and Nepal (the South Asian monsoon) and frontal rainfall over China, Japan, and the Korean Peninsula (the East Asian monsoon). In addition, the Himalayas and other orography, including the Arakan Mountains, Ghats, and Yunnan Plateau, create smaller precipit...

This paper discusses results of a simulation with the regional climate model HIRHAM for 1958-2001, driven by the ECMWF reanalysis (ERA40) data over the Arctic domain. The aim is to analyze the ability of the model to capture certain features of climate extremes derived from daily mean, maximum and minimum temperatures. For this purpose, a range of climate indices (frost days, cold and warm spel...