Surface Signs of the Biennial Atmospheric Pulse

Abstract

Further e\ idelice i s prcseiited for the prcsericc of a persistent pcriodicity somewhat in excess of 2 years duration. I t s existence can be shown in the surface temperature a t widely separated stations along two ineridiaiis from Norway t o South Africa and from Canada to Cape Horn. Time series analysis by means of a narrow band-pass filter indicates phase relations among the stations, the most iinportant of theae being t h a t t h e intertropical rcgions appear to be mutually in phase and that the higher-latitude statioiis are out of phase with the tropical stations. In the Northern Hemisphere, a t extratropical stations, the amplitudes of thc pulse arc largest when the pulsc extremes coincide with the winter months.

Die quasi-biennale Veränderlichkeit der Zirkulation in hohen Breiten während des Winters

“…Fig. 6 sheds additional light on a statistical investigation undertaken by Landsberg et al [15]. They found a quasi-biennial temperature variation at a number of stations in both hemispheres.…”

Solar-generated quasi-biennial geomagnetic variation

“…This numerical filter is the same as that used by Landsberg et al (1963) for their analysis of the surface temperature. Characteristics of the filter are briefly described in the Appendix.…”

the present status of the 26-month oscillation1,2

“…Efforts to trace the oscillation into the troposphere and into higher latitudes [21][22][23][24][25][26][27][28][29] are tropospheric hampered by the fact diat the amplitude becomes much weaker in these regions while behavior variability (or variance) of the meteorological elements becomes in general much greater. Thus we are faced with the problem of detecting a weak signal amid loud noise.…”