Fig. 3From: Cold surge event observed by radiosonde observation from the research vessel “Hakuho-maru” over the Philippine Sea in December 2012The result of the radiosonde observation of the Hakuho-maru cruise. (Upper) Latitude-height section of water-vapor mixing ratio (gray shading) and potential temperature (black contours) from the moving observations from 29°N to 22°N. (Lower) The same as the upper panel, except for the time-height cross-section during the fixed-point observation during December 24–26, 2012Back to article page