Influence of the solar radiation on the diurnal and seasonal variability of O3 and H2O in the stratosphere and lower mesosphere based on continuous observations in the tropics and high Arctic

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The goal of this project is to measure changes in O3 and H2O in the stratosphere and mesosphere in the Arctic at Ny-Ålesund/Spitsbergen and the Tropics at Mérida/ Venezuela with special emphasis on the effects due to solar variability. These measurements will allow us to study the following scientific topics:- Measure the influence of the diurnal and seasonal variability of water vapour on the ozone chemistry in the tropics compared to the high Arctic.- Investigate the influence of UV variability compared to the influence of charged particles on ozone by comparisons of measurements at the two sites.- Estimate the vertical transport of mesospheric air downward into the upper and middle stratosphere.- Assess the long-term impact of variations in water vapour concentrations on the stratospheric ozone chemistry in the Arctic and the Tropics.