The Relationships among Wind, Horizontal Pressure Gradient, and Turbulent Momentum Transport during CASES-99 Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/q237hx14n

This is the publisher’s final pdf. The published article is copyrighted by the American Meteorological Society and can be found at:  http://www.ametsoc.org/.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Relationships among the horizontal pressure gradient, the Coriolis force, and the vertical momentum transport by turbulent fluxes are investigated using data collected from the 1999 Cooperative Atmosphere-Surface Exchange Study (CASES-99). Wind toward higher pressure (WTHP) adjacent to the ground occurred about 50% of the time. For wind speed at 5 m above the ground stronger than 5 m s(-1), WTHP occurred about 20% of the time. Focusing on these moderate to strong wind cases only, relationships among horizontal pressure gradients, Coriolis force, and vertical turbulent transport in the momentum balance are investigated. The magnitude of the downward turbulent momentum flux consistently increases with height under moderate to strong winds, which results in the vertical convergence of the momentum flux and thus provides a momentum source and allows WTHP.In the along-wind direction, the horizontal pressure gradient is observed to be well correlated with the quadratic wind speed, which is demonstrated to be an approximate balance between the horizontal pressure gradient and the vertical convergence of the turbulent momentum flux. That is, antitriptic balance occurs in the along-wind direction when the wind is toward higher pressure. In the crosswind direction, the pressure gradient varies approximately linearly with wind speed and opposes the Coriolis force, suggesting the importance of the Coriolis force and approximate geotriptic balance of the airflow. A simple one-dimensional planetary boundary layer eddy diffusivity model demonstrates the possibility of wind directed toward higher pressure for a baroclinic boundary layer and the contribution of the vertical turbulent momentum flux to this phenomenon.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Sun, J., Lenschow, D., Mahrt, L., & Nappo, C. (2013). The relationships among wind, horizontal pressure gradient, and turbulent momentum transport during CASES-99. Journal of the Atmospheric Sciences, 70(11), 3397-3414. doi:10.1175/JAS-D-12-0233.1
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces

Relationships

In Administrative Set:
Last modified: 10/27/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items