TELECONNECTIONS AND PHASE RELATIONS OF RAINFALL AT THE TROPICAL PACIFIC OCEAN.
Abstract
Teleconnections and phase relationships of 35 rainfall series in the tropical Pacific region were investigated by means of cross spectrum analysis. Main interest is directed to anomalies in the dry equatorial belt. Comparison of all spectra suggests a classification. Four climatological rainfall spectrum types and their regional distribution are depicted. More than 100 cross spectra reveal in the Pacific a region along the equator extending from the west coast of South America towards 165 deg. E where all stations give mutually significant coherencies. This region encompasses the arid equatorial zone and its immediate neighbourhood. Teleconnections between other stations are generally caused only by the frequency range of the annual cycle. Significant phase relations are exhibited by periodicities above two years. Stations in the coherent region are in-phase. Phase differences suggest a southward propagation of anomalies in this region. The mean speed in the Central Pacific area between 4 deg. N and 4-5 deg. S lies in the range of 10-40 km/d, i.e. anomalies starting at the northern limit of the coherent region reach the central part of the arid zone in about 2 months. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1967
- Accession Number
- AD0664599
Entities
People
- Rolf Doberitz
Organizations
- University of Bonn