Measurements of the fluctuations of humidity, temperature
and velocity were made in the marine boundary layer. The humidity
fluctuations were measured with a Lyman-alpha humidiometer.
Temperature fluctuations were measured with a dry thermocouple
and a platinum resistance thermometer. Velocity fluctuations were
measured with a three component sonic anemometer. These measurements
were made from the Floating Instrument Platform (FLIP)
operated by the Scripps Institution of Oceanography near San Diego
in February, 1969 and during the Barbados Oceanographic and Meteorological
Expedition (BOMEX) in May 1969.
The data were processed by digital techniques and the various
spectra, cospectra and quadspectra between the velocities, humidity
and temperature were obtained. Integrals of the cospectra were
produced which allowed estimates of the fluxes of latent and sensible
heat to be made.
The normalized spectra of humidity fluctuations in San Diego
and BOMEX have similar shapes. The normalized cospectra between
vertical velocity and humidity in San Diego and BOMEX have similar
shapes. Universal forms for the normalized humidity spectrum and
the normalized cospectrum between vertical velocity and humidity
may exist.
The normalized spectra of the temperature fluctuations in San
Diego and BOMEX have different shapes. The differences in shapes
may be related to stronger radiation effects during BOMEX than in
San Diego. The normalized cospectra between vertical velocity and
temperature in San Diego and BOMEX also have different shapes. It
is probable that a universal form does not exist for the normalized
temperature spectrum or for the normalized cospectrum between
vertical velocity and temperature.
Directly measured values of the latent and sensible heat fluxes
were used to test the validity of the bulk aerodynamic method of predicting
the latent and sensible heat fluxes from the mean wind speed
and mean air-sea humidity or temperature differences. The limited
results from San Diego indicate that the sensible heat flux may probably
be predicted from the mean wind speed and the mean air-sea
temperature difference in temperate regions. The bulk aerodynamic
method was not useful for predicting the sensible heat flux in BOMEX.
The observed values for the sensible heat flux were much larger than
would be predicted. The latent heat flux could be predicted from the
mean wind speed and the mean air-sea absolute humidity difference
with a probable error of less than 20%.
The validity of the formula developed by Bowen (1926) for predicting
the Bowen ratio (sensible heat flux/latent heat flux) was tested
with directly measured values of the Bowen ratio. It was found that
in San Diego the Bowen ratio could be predicted with a probable error
of 15%. The Bowen ratio predicted for BOMEX was too low by a factor
of two or more.
The ability to predict the Bowen ratio from the ratio of the
temperature fluctuations to the humidity fluctuations in the 0.05-0.1
Hz range was investigated. The method predicted the Bowen ratio
with a probable error of 15% in San Diego and 20% in BOMEX. / Graduation date: 1971
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29058 |
| Date | 24 November 1970 |
| Creators | Phelps, George Thomas |
| Contributors | Pond, G. Stephen |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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