91 Linear Analysis of Moisture Transport due to Baroclinic Waves

Monday, 8 January 2018
Exhibit Hall 3 (ACC) (Austin, Texas)
Alfredo N Wetzel, Univ. of Wisconsin, Madison, WI; and L. M. Smith and S. N. Stechmann

In this presentation, the effects of rainfall speed and meridional/vertical moisture gradients on the meridional moisture transport of mid-latitude baroclinic waves are examined. These effects are investigated using an idealized quasi-geostrophic model with simplified microphysics. Specifically, a single-phase Eady problem is considered for three fundamental moisture regimes: unsaturated, saturated with no rainfall speed, and saturated with rainfall speed. It is shown that the meridional moisture transport, as a function of height, has a mid-tropospheric maximum in the case of no rainfall speed and a maximum in the lower or surface troposphere for sufficiently large values of rainfall speed. These results for different rainfall speed values are then discussed in the context of meridional moisture transport in observational data.
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