Hurricane Boundary Layer Height Relative to Storm Motion from GPS Dropsonde Composites
| Autor: | Jun A. Zhang, Yifang Ren, Stephen R. Guimond, Xiang Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Mixed layer Planetary boundary layer tropical cyclone hurricane Inflow Environmental Science (miscellaneous) lcsh:QC851-999 01 natural sciences Wind speed 010305 fluids & plasmas atmospheric boundary layer 0103 physical sciences storm motion Dropsonde Physics::Atmospheric and Oceanic Physics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Richardson number Geodesy Boundary layer dropsonde lcsh:Meteorology. Climatology aircraft Geology asymmetry Radius of maximum wind |
| Zdroj: | Atmosphere, Vol 10, Iss 6, p 339 (2019) Atmosphere Volume 10 Issue 6 |
| ISSN: | 2073-4433 |
| Popis: | This study investigates the asymmetric distribution of hurricane boundary layer height scales in a storm-motion-relative framework using global positioning system (GPS) dropsonde observations. Data from a total of 1916 dropsondes collected within four times the radius of maximum wind speed of 37 named hurricanes over the Atlantic basin from 1998 to 2015 are analyzed in the composite framework. Motion-relative quadrant mean composite analyses show that both the kinematic and thermodynamic boundary layer height scales tend to increase with increasing radius in all four motion-relative quadrants. It is also found that the thermodynamic mixed layer depth and height of maximum tangential wind speed are within the inflow layer in all motion-relative quadrants. The inflow layer depth and height of the maximum tangential wind are both found to be deeper in the two front quadrants, and they are largest in the right-front quadrant. The difference in the thermodynamic mixed layer depth between the front and back quadrants is smaller than that in the kinematic boundary layer height. The thermodynamic mixed layer is shallowest in the right-rear quadrant, which may be due to the cold wake phenomena. The boundary layer height derived using the critical Richardson number ( R i c ) method shows a similar front-back asymmetry as the kinematic boundary layer height. |
| Databáze: | OpenAIRE |
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