Browsing by Author "Mabres, A."

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    Dendrochronological studies in the Peruvian north coast relate to ENSO
    (Instituto Geofísico del Perú, 2000) Rodríguez, R.; Mabres, A.; Flores, L.A.; Woodman Pollitt, Ronald Francisco
    Dendrochronological studies in the peruvian nort coast to find records of past El Niño - Southern Oscillation (ENSO) events began an the ale 80's. The peruvian north coast is the west-most area of South America, close to equator (05o S 80o W) and to the Sechura desert, is a very sensitive area to the climatic changes due to ENSO. An initial selection of several regional trees have been done for study. The study includes phenological observations and tree ring characteristics analysis as well as racial growth control of tree trunks and branches. The species more intensively studied and suitable to fina records due to the ENSO are Palo Santo, Hualtaco and Sapote.
    Palabras clave:El NiñoClimate changeAtmospheric precipitation
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    Determination of maximum age from the probability distribution function of a growth parameter
    (Instituto Geofísico del Perú, 1990-04-17) Woodman Pollitt, Ronald Francisco; Balsley, B.B.; Mabres, A.
    The present notes are motivated by the problem of trying to determine the maximum age of trees which we have under study in the northern part of Perú. The final objective of the project is to decipher the occurrence of El Niños in the past, witch should have been registered in its growth rings.
    Palabras clave:El Niño currentRadiocarbon datingMulti-purpose trees
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    Formación de un cordón litoral en Máncora, Perú, a raíz de El Niño de 1983
    (Institut Français d'Etudes Andines (IFEA), 1993) Woodman Pollitt, Ronald Francisco; Mabres, A.
    Se ha postulado que los cordones litorales fósiles de Colán, en el norte del Perú, podrían haber sido formados durante eyentos muy intensos del fenómeno El Niño (Mega-Niños). El presente trabajo documenta la formación en Máncora, Perú, de un nuevo cordón como consecuencia del evento extraordinario de El Niño de 1983, probablemente el más fuerte registrado en los últimos siglos desde la conquista" española. Se presenta esta formación como evidencia de lo postulado para los cordones de Colán.
    Palabras clave:Corriente El NiñoCambio climáticoPaleoclimatología
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    Report from the International Workshop on Remote Sensing in Geophysics Using Doppler Techniques
    (American Meteorological Society, 1998) Brandolini, A.; Balsley, B. B.; Mabres, A.; Woodman Pollitt, Ronald Francisco; Capsoni, C.; D'Amico, M.; Ecklund, W. L.; Hagfors, T.; Harper, R.; Heron, M. L.; Hocking, W. K.; Lehtinen, M. S.; Rottger, J.; Sarango, M. F.; Sato, T.; Stauch, R. J.; Vaughn, J. M.; Wyatt, L. R.; Zrnic, D. S.
    Presents a summary of a meeting staged by the International Workshop on Remote Sensing in Geophysics Using Doppler Techniques, which was held on March 5, 1996 in Bellagio, Italy at the Rockefeller Study and Conference Center.
    Palabras clave:Signal processingRemote sensingDoppler effect
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    The ST radar under construction at Piura, Peru (6°S, 81°W)
    (Instituto Geofísico del Perú, 1989) Balsley, B.B.; Ecklund, W.L.; Carter, D.A.; Gage, K.S.; Mugica, R.; Mabres, A.; Rodriguez, R.; Avery, S.K.; Violette, J.; Woodman Pollitt, Ronald Francisco
    The Piura ST radar currently under construction at the Universite de Piura in Piura, Peru will be a 50 MHz VHF system. This radar will form the easternmost facility in the proposed trans-Pacific network of ST radars that will eventually span the equatorial Pacific. Support for the construction of the Piura radar is being furnished by the U.S. National Science Foundation. The ST radar at Piura is part of a cooperative research program involving NOAA's Aeronomy Laboratory and the University of Colorado in the United States and the Universite de Piura and the Instituto Geofísica del Peru in Peru. The radar is being constructed on the campus of the Universite de Piura. A container filled with antenna cables and radar hardware was shipped from Alaska during the past few months. Site preparations are now underway and the antenna construction will begin about the first of the year. A building will be constructed next to the antenna site to house the radar equipment. A diesel generator has been purchased to provide a continuous source of power to the radar. The first phase of construction will be com­pleted by mid-1989 and the radar will be operated for the first year in a vertical-only mode. During 1990 the radar will be modified so that horizon­tal as well as vertical velocities can be measured.
    Palabras clave:RadarDesign and constructionAeronomy