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Asian Journal of Earth Sciences
  Year: 2012 | Volume: 5 | Issue: 3 | Page No.: 88-95
DOI: 10.3923/ajes.2012.88.95
 
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Monitoring of GPS Water Vapor Variability During ENSO Events over the Borneo Region

Wayan Suparta and Ahmad Iskandar

Abstract:
The cycle of El Niño-Southern Oscillation (ENSO) is very crucial to affect the natural climate variability in a particular region. Direct measurement of ENSO cycle and to understand their comprehensive physical mechanism are still difficult for sustainable development. For that purpose, a Precipitable Water Vapor (PWV) derived from a ground-based Global Positioning System (GPS) receiver is proposed. The PWV for the year 2011 gathered from Universiti Malaysia Sabah located in Kota Kinabalu, Malaysia (UMSK) together with two other selected GPS stations centered the Borneo region in pathways of Niño 4 region, named Nanyang Technological University (NTUS) in the Singapore and Manila Observatory (PIMO) in Philippines were analyzed. The GPS PWV was also compared with PWV taken from Radiosonde (RS). The results found a good agreement between GPS PWV and RS PWV with correlation coefficients ranging from 0.6 to 0.8, significantly at the 99% confidence level. PWV at Philippine's station demonstrated a drop about 7.8 mm before the first monsoon and PWV in the whole station look like a bimodal pattern throughout the year. An investigation of ENSO episode in September with weak-to-moderate intensity between PWV and the sea-surface temperature anomaly demonstrated an inverse correlation due to La Niña events. This promising result indicates that during the La Niña event, the PWV is increased when the sea-surface temperatures getting cold and thereby slow down the GPS signals.
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How to cite this article:

Wayan Suparta and Ahmad Iskandar, 2012. Monitoring of GPS Water Vapor Variability During ENSO Events over the Borneo Region. Asian Journal of Earth Sciences, 5: 88-95.

DOI: 10.3923/ajes.2012.88.95

URL: https://scialert.net/abstract/?doi=ajes.2012.88.95

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