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- W1997748072 abstract "The impact is studied of strong gradients of wind and humidity on the ageostrophic circulation developed around a conceptual cold-frontal system. The simulated basic wind and temperature fields are chosen to best represent the frontal observations made during the Fronts 87 field experiment and, in particular, to take account of the presence of strong low-level jets. The numerical solution of the diagnostic Sawyer—Eliassen equation in both its adiabatic and diabatic forms permitted us to test the impact of the wind and humidity structure on the corresponding ageostrophic circulation. In particular, strong negative shear above the low-level jet core enhanced subsiding motions on the warm side of the front, which restricted the horizontal extent of the cloud cover. On the other hand, the presence of well-marked horizontal humidity gradients aloft, at the rear edge of the cloud cover, enhanced the ascending motions ahead of the frontal surface, creating locally a secondary maximum of upward motions. The degree of stability within the prefrontal boundary layer was found to be of major importance with regard to the intensification of the upright convection near the leading edge of the front. Moreover, the incorporation of a parametrization scheme, representing the Ekman pumping at the top of the boundary layer, enhanced the diagnosed circulation ahead of the front. A comparison with observations made during two case-studies of Fronts 87 seems to confirm these results." @default.
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- W1997748072 date "1994-10-01" @default.
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- W1997748072 title "Influence of strong gradients of wind and humidity on frontal ageostrophic circulations" @default.
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