Statistics – Applications
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........39j&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF WISCONSIN - MADISON, 1987.Source: Dissertation Abstracts International, Volume: 49-03, Sectio
Statistics
Applications
Scientific paper
The understanding and applications in involving flow in the planetary boundary layer (PBL) require better knowledge of mutual large-scale adjustment processes between wind, mass and turbulence fields, called simply "PBL adjustment". These processes for frictionally decaying circulations over the ocean have been analysed for idealized one- and two-layer PBL models on both the midlatitude f- and equatorial beta-planes. For each case, both eigenmode problem and initial value problem approaches have been used in order to reveal the spatial and temporal characteristics of each mode and vertical interactions in the presence of friction. Three mechanisms are found to have varying impacts on the flows: direct decay, energy dispersion, and spin -down mass adjustment. For large horizontal scales in a one-layer model, friction causes intertial-gravity waves to decay rapidly and geostrophic waves slowly on the f -plane, while all types of waves decay fast on the equatorial beta-plane. For a two-layer model subcloud-layer friction causes barotropic waves to decay slowly and baroclinic waves rapidly both on the f- and equatorial beta-planes. The energy of barotropic waves disperses fast and that of baroclinic waves slowly. Energy dispersions are little affected by friction for all types of waves except for long Rossby and Kelvin waves at low latitudes. The lower-layer friction effect in the two-layer system on the f-plane is to create divergent winds for barotropic geostrophic waves in both layers and to create secondary circulations and spin-down processes. Two major effects of friction on eigenfunctions for each mode on the equatorial beta-plane are horizontal phase tiltings and meridional de-trappings. These effects are most dominant for long Rossby waves. The former may be associated with meridional transports of the zonal momentum and energy propagation due to pressure work. Results from the initial value problem approach in the midlatitudes imply that observations of divergent winds in the boundary layer are more important for synoptic and subsynoptic scales than for any other scales. Those in the tropics show that nondivergent wind observations in the upper layer near the equator may be more important than those observations in the lower layer.
No associations
LandOfFree
Dynamical Adjustments in the Planetary Boundary Layer. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamical Adjustments in the Planetary Boundary Layer., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical Adjustments in the Planetary Boundary Layer. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-905936