Use of obliquely rotated principal component analysis to identify coherent structures
| Autor: | George S. Young, Donald K. Rinker |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Convection
Atmospheric Science business.industry Planetary boundary layer Geometry Convective Boundary Layer Physics::Fluid Dynamics Boundary layer Optics Astrophysics::Solar and Stellar Astrophysics Outflow Gravity wave business Physics::Atmospheric and Oceanic Physics Geology Geostrophic wind Large eddy simulation |
| Zdroj: | Boundary-Layer Meteorology. 80:19-47 |
| ISSN: | 1573-1472 0006-8314 |
| DOI: | 10.1007/bf00119010 |
| Popis: | Principal component analysis (PCA) with oblique rotation is applied to Large Eddy Simulation (LES) results to discern and quantify coherent structures within the convective boundary layer (CBL). Sensitivity tests are first conducted on a moderately convective LES run. Once the ability of PCA to generate robust results is verified, the method is applied to LES runs spanning a range of stability regimes. Interregime similarities and differences in the coherent structures are discussed. For the moderately convective LES run, three-dimensional convective cells are arrayed in two-dimensional bands aligned with the geostrophic wind. The resulting gravity waves in the free atmosphere and convective inflow and outflow in the boundary layer are also captured by the PCA. Convective modes are more sensitive to the ratio of w* to u* than are the dynamic modes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink