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A Study Of 40- To 50-Day Oscillation In The Philippines

Cynthia P. Celebre
1993

The occurrence and characteristics of the 40- to 50-day oscillation in the Philippines is studied. Station pressure, rainfall and wind data from different stations located in the country were filtered and subjected to spectral and cross-spectral analyses.

Results of the spectra of station pressure indicate that the oscillation extends from the southernmost (Zamboanga) to the northernmost (Basco) station and from the extreme western (Pto. Princesa) to the easternmost (Guiuan) station. Spectra of wind data showed that the phenomenon seems to be present at all levels of the atmosphere, while spectral peaks at the periods of interest are also present for rainfall. Cross-spectral results of station pressure also indicate that the oscillations in one station are also present in other stations. The phase angle distribution suggests that most oscillations in the area of study propagate westward near the equator, then northwestward to north northwestward in the higher latitudes. Some disturbances that originate from the west travel northeastward to northward. One possible application of the results of this study is the determination of the probable preferred seasonal tracks of tropical cyclones in the Philippines.

The Atmospheric Pollutants And Selected Weather Elements In Manila And Quezon City: Inputs To Teaching Air Pollution

Maribel G. Enriquez
1993

The concentrations of carbon monoxide, hydrocarbon, nitric oxide, nitrogen dioxide, sulfur dioxide, oxidant and dust at Manila and Quezon City were studied in relation to the volume of rainfall (mm) and temperature readings (degree celsius). The concentrations of these pollutants were quite high during the months when rainfall profiles were at minimum from October to June in Manila and from October to April in Quezon City and temperature profiles at its maximum (March to June). Moreover, the study showed promising relationship between the weather elements and atmospheric pollutants profiles based on correlation coefficient which demonstrated a five-percent (5%) level of significance and regression equations. Also, a lesson guide for this study was prepared that may be useful as a tool for science teaching particularly in air pollution.