Short-term planetary-scale interactions over the tropics and midlatitudes. Part II: Winter-MONEX period.

Abstract

Short-term teleconnections over the Pacific sector of the tropics and the midlatitudes in relation to monsoonal surges during the winter of 1978-79 are investigated using 850 and 200 mb wind data from FGGE/Winter-MONEX. Results show that the intensification of the 200 mb jet streak over Japan is a precursor of cold surges and subsequent downstream development over the central Pacific. A large part of the transient variation of the jet at the entrance region near northeastern China is controlled by the upper level ageostrophic flow transverse to the jet while elsewhere the contribution by momentum flux convergence is more important.-from Authors