Analysis of GPS water vapor variability during the 2011 La Niña event over the western Pacific Ocean

Wayan Suparta, Ahmad Iskandar, Mandeep Singh Jit Singh, Mohd Alauddin Mohd. Ali, Baharudin Yatim, Ahmad Norazhar Mohd Yatim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We analyzed the variability of global positioning system (GPS) water vapor during the 2011 La Niña events over the western Pacific Ocean. The precipitable water vapor (PWV) derived from the UMSK (Malaysia) GPS station was investigated and compared with four other selected GPS stations: NTUS (Singapore), PIMO (Philippines), BAKO (Indonesia) and TOW2 (Australia). Analysis of the correlation between PWV and the sea-surface temperature anomaly (SSTa) on a weekly basis for the three La Niña cases of January-February-March, August-September-October, and October-November-December was used as an indicator of the influence of the El Niño Southern Oscillation. A good relationship between GPS PWV and SSTa for the Niño 4 region, with correlation coefficients between -0.91 and -0.94, was observed for the August-September-October and October-November-December cases. During the 2011 La Niña events, the water vapor was seen to increase to about 8.39 mm for the October- November-December case, with decreases of about 4.20 mm for the remaining months, compared to the mean 2011 value. This implies that during these events, the precipitation in the western Pacific is increased, due to stronger easterly trade winds blowing along the eastern Pacific Ocean than along the western Pacific, and a mass of warm water moving westwards, thereby increasing the evaporation.

Original languageEnglish
JournalAnnals of Geophysics
Volume56
Issue number3
DOIs
Publication statusPublished - 2013

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Pacific Ocean
Global Positioning System
water vapor
GPS
precipitable water
ocean
sea surface temperature
temperature anomaly
stations
anomalies
Malaysia
Singapore
Southern Oscillation
Indonesia
Philippines
trade wind
blowing
warm water
correlation coefficients
evaporation

ASJC Scopus subject areas

  • Geophysics

Cite this

Analysis of GPS water vapor variability during the 2011 La Niña event over the western Pacific Ocean. / Suparta, Wayan; Iskandar, Ahmad; Jit Singh, Mandeep Singh; Mohd. Ali, Mohd Alauddin; Yatim, Baharudin; Mohd Yatim, Ahmad Norazhar.

In: Annals of Geophysics, Vol. 56, No. 3, 2013.

Research output: Contribution to journalArticle

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