Monday, 10 February 2003: 12:00 PM
Revisiting the effects of surface fluxes on rapid marine cyclogenesis
Wendell A. Nuss, NPS, Monterey, CA; and D. K. Miller
Poster PDF
(246.6 kB)
The role of surface sensible and latent heat fluxes in
rapid oceanic cyclone development was a common topic in
the late 1980s and early 1990s. The debate centered on
the importance of these fluxes in overall storm
development. Upward fluxes of water vapor and heat
contribute to decreased low-level static stability
(Reed and Albright 1986) and can pre-condition the storm
environment for subsequent development (Kuo and
Low-Nam 1990, and Kuo, Reed, and Low-Nam 1990). Depending
on the phasing of the low-level fluxes relative to the
baroclinic zone, the fluxes could either damp or amplify
overall cyclogenesis during the period of storm development
(Nuss and Anthes 1987, and Kuo, Reed, and Low-Nam 1990).
The purpose of this study is to revisit the role of surface
sensible and latent heat fluxes for a case of rapid oceanic
storm development in order to better quantify and categorize,
in both space and time relative to the developing surface
cyclone, instances when surface sensible and latent heat
fluxes amplify or dampen its development.
In order to accomplish the stated purpose, this study will
examine the sensitivity of mesoscale model forecast solutions
to varied sea surface temperature (SST) configurations for a
case study observed during the PACJET Field Experiment which
took place on 13 February 2001 in the vicinity of the
California Bight region. In this particular case, Touchton
(2002) noted that the air-sea fluxes in the early stages of
cyclone development may have helped [1] to enhance its
associated low-level baroclinic zone and [2] destabilize
the lower atmosphere making the environment potentially
unstable. Observations from PACJET, in addition to satellite
imagery and standard observations, will be used to confirm
structures generated by the mesoscale model.
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