SEMINAR: reminder of amp student seminar today at noon

[areniers@rsmas.miami.edu]

HI All,

this is a reminder for the upcoming AMP student seminar today at noon in
the AMP conference room. We have two speakers:

Enthalpy Transfer across the Air-Water Interface in High Winds Including
Spray by Dahai Jeong

and

Wave data from ASIS-buoy during the Southern Ocean Gas Exchange Experiment
by Jaeyon Lee


abstracts are given below

Ad Reniers






Enthalpy Transfer across the Air-Water Interface in High Winds Including
Spray

Dahai Jeong


Abstract
Controlled experiments were conducted in the Air-Sea Interaction Saltwater
Tank (ASIST) at the University of Miami to investigate the processes of
air-sea enthalpy (sensible and latent heat) transfer under various wind
speeds (range of 0.6 to 39 m s−1 at 10 m height) and water-air
temperature differences (range of 1.3 to 9.2 °C). An indirect calorimetric
method or heat content budget technique yielded accurate determinations of
enthalpy fluxes under laboratory conditions of high winds with spray. A
detailed dependence of interfacial enthalpy exchange coefficients with
wind speed was revealed. Interfacial enthalpy fluxes normalized to a 10 m
height decreased with increasing wind speed for smooth flows (U10N < 3 m
s&#8722;1), increased with wind for rough flows (U10N > 5 m s&#8722;1),
and were virtually independent of wind for fully rough flows with spray
(U10N > 13 m s&#8722;1). In addition, spray mediated heat flux was
assessed from the sensible heat exchange in the air boundary layer. The
results suggest that spray mediated fluxes play a role in the balance of
sensible heat and humidity over the water, but have a negligible
contribution to the total enthalpy flux for winds up to 30 m s&#8722;1
referred to 10 m height.  The validity of the results is assessed using
data from two available field measurements. Further research is needed to
clarify the effect of spray on the exchange of heat and moisture above the
sea in very strong winds.


Title:
Wave data from ASIS-buoy during the Southern Ocean Gas Exchange Experiment

Abstract:
Turbulence-enhanced gas exchange affected by many factors (wind stress,
wave-age, wave and current interactions, surface films) is related to the
surface roughness. The air&#8211;sea exchange of carbon dioxide varies by
a factor of 2 depending on the formulation of the exchange process. This
considerable uncertainty is due in part to the difficulty in
parameterizing the gas transfer velocity, k660, usually given as a
function of wind speed. Recent field data showed that Correlation between
gas transfer velocity and mean square slope stronger than correlation
between gas transfer velocity and wind speed (Frew et al. 2004). The talk
introduces the experiment and instrumentation, and the preliminary results
from the experiment are presented.



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