GPS-based water vapour variability in declining phase of solar cycle 23: A possibility coupling?

Sun-Earth coupling studies can explain some physical mechanisms of how solar activity exerts their influences on weather/climate changes. Using the GPS-derived precipitable water vapour (PWV) measurements as a tool to study water vapour variability, it is fundamental to calculation of a reliable weather forecast for advancement space weather prediction and such methods provide suitable platforms for the studies of solar-climate relationship. This paper presents an analysis of the PWV variability and its responses to solar activity during the declining phase of solar cycle 23.