Concert recording 2022-04-05

[Track 1]. In Bach\u27s studio -- [Track 2]. South Africa -- [Track 3]. The grey convoy -- [Track 4]. Ode for Leo -- [Track 5]. A moody time

Concert recording 2022-04-05

[Track 1]. In Bach\u27s studio -- [Track 2]. South Africa -- [Track 3]. The grey convoy -- [Track 4]. Ode for Leo -- [Track 5]. A moody time

Jim Healy and Mrs Healy

Jim Healy, Waterside Workers' Federatio

Jim Healy and others

Jim Healy, Waterside Workers' Federatio

Tropical intraseasonal oscillation appearing in operational analyses and in a family of general circulation models

The statistics of the tropical intraseasonal variability (MJO) is analyzed in the ECMWF analyses and in several ECHAM GCM experiments, which have been performed with different model versions (ECHAM2 and ECHAM3), horizontal resolutions (T21, T42 and T106), and with and without annual cycle. The analysis technique is the Principal Oscillation Pattern (POP) analysis, applied to the 200 mb equatorial velocity potential. The intercomparison of ECHAM2 experiments with and without annual cycle shows that much more realistic results are obtained when the annual cycle is included in the simulation. At low resolution (T21), the improved model physics has a beneficial impact on the simulated MJO. The oscillation is more successfully reproduced in the more recent model version (ECHAM3). An increase of the horizontal resolution, in this latter case, leads to less favorable results. (orig.)SIGLEAvailable from TIB Hannover: RR 1347(165) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Numerical experiments on the atmospheric response to cold Equatorial Pacific conditions ('La Nina') during northern summer

The effect of cold conditions in the central and eastern Equatorial Pacific during Northern Summer is examined in a series of numerical experiments with the low resolution (T21) atmospheric general circulation model ECHAM2. Anomalous sea surface temperatures (SST) as observed in June 1988 were prescribed and the effect on the global circulation is examined. In the model atmosphere, the anomalous cold water in the Equatorial Pacific excites a strong and stable response over the tropical Central and East Pacific. From here stationary Rossby waves radiate into both hemispheres. The Northern Hemisphere wave train is weak and affects only the Northeast Pacific area; the Southern Hemisphere wave train arches from the Central Pacific over the southern tip of South America to the South Atlantic. This response is not only present in the basic anomaly experiment with the T21 GCM but also in experiments with SST anomalies confined to the tropics and with an envelope-formulation of the SST anomalies, in experiments with a linear model, and in high resolution (T42) model experiments. The model output is also compared to the actually observed atmospheric state in June 1988. (orig./KW)SIGLEAvailable from TIB Hannover: RR 1347(106) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman