Accession Number : AD0822388

Title :   RESEARCH ON TROPICAL RAINFALL PATTERNS AND ASSOCIATED MESOSCALE SYSTEMS.

Descriptive Note : Semi-Annual rept. no. 2, Mar-Aug 67,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF METEOROLOGY

Personal Author(s) : Henry, Walter K. ; Griffiths, John F. ; Cobb, L. Glen ; Morris, David

Report Date : OCT 1967

Pagination or Media Count : 192

Abstract : An attempt is made at finding the rainfall pattern in Guyana and Surinam. The discussion includes the seasonal changes of rainfall, the variation of the rainfall, and an analysis of the coefficient of association of rainfall across the area. The movement of rains across Colombia are investigated by use of three day running totals. The results showed some movement to the south at a rate of about twenty miles per day. A study of daily rainfall in interior Colombia is initiated. An attempt is made at establishing the size and location of principal mesoscale systems on individual days. A study is also made of the contingency index vs distance in the Bogota area. The normality or square-root normality of rainfall in Guyana and Surinam is investigated. The number of station-months passing the tests is almost identical with that found in other tropical areas. An examination of the geographical distribution of the non-normal stations does show grouping which should be investigated further. The method of extreme value distribution has been applied to some rainfall data from Venezuela. The analysis shows that in nearly all cases it is possible to use the asymptotic distribution. A method of areal presentation is derived and presented. The general problem of rainfall trends is investigated by the use of the single-runs test and simple linear regression. No significant trends for stations in Guyana and Surinam were found. Mean monthly sea surface temperatures along the coast of Peru, Ecuador and Colombia for the period 1952-1960 are compared to the rainfall quantities received along the coastal plain.

Descriptors :   *SOUTH AMERICA), (*RAINFALL, DISTRIBUTION), (*TROPICAL REGIONS, SURINAM, COLOMBIA, VENEZUELA, GUYANA, METEOROLOGICAL PHENOMENA, DIURNAL VARIATIONS, COASTAL REGIONS, ECUADOR, PERU, ATMOSPHERIC TEMPERATURE, CORRELATION TECHNIQUES, PERIODIC VARIATIONS, PROBABILITY, COMPUTERS, VOLUME, WEATHER STATIONS, TERRAIN.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE