I n the present study, an airborne infrared radiometer was used for measuring the surface temperature of the sea. We have here some problems to
consider. Emissivity of the sea surface and attenuation of infrared radiation
during passage through the air will affect the readings of the radiometer. For
instance. the infrared imagery of the sea surface polluted with pulp sewage
from a factory is quite different from one not polluted, even though the
temperature is not so different between them (see Ochiai, 1973). In the
present experiment, therefore, the sea-surface temperature was directly
measured at several points. In addition, attention was paid so that reflection
of the sunshine would not spoil the readings.
The diffusion of thermal pollution is more or less affected by air temperature, wind velocity, depth of the sea, current velocity, exhaust velocity of the
pollution, and other factors. However, since these were measured at only a
few points in the present study, the data are not enough for analysis. This is a
problem to be solved in the future.
Lastly, it should be pointed out that the plume of thermal pollution here
studied is “instantaneous,” and the diffusion coefficient obtained from it
may be different from that averaged for some time (e.g., Ito, 1972).
REFERENCES
lio, S. (1972). The atmospheric diflusian in the hori7,ontal direction in relation to finite sampling
period. J . Afereorol. SOC. Jup. 50. 5Y- 64.
Ochi~i. M. (1973). On aerial measurement of infrared imagery of sea surface with infrared line
scanner. J . Ocrunogr. Sot,. Jap. 29. 8 . 15. (In Jap. with Engl. ahstr.).
Okuho. (2. (1970). Oceanic turbulence and diffusion. In “Oceanic Physia“ (J. Masuzawa, 4.)
pp. 265 -381. Tokai Univ. Press, Tokyo. (In lap.).
Onnidov. R. V. (1968). *’ Horizontal Turbulence and Turbulent Exchange in the Ocecin.” 199
pp. Nauka, Moscow. (In Russ.).
Richardson. L. t;. (1926). Atmospheric diffusion shown on a distance-neighbour graph. Pro(,.
H ~ J ~ s .
Soc. Scr. A 110. 709 - 737.
Stewiiri, K. W.. and Grant, 14. L. (1961). Delerniination of the rate of dissipation of turbulent
cncrgy near the sen surfuce in the preseiw of waves. J . Cuophys. Rcs. 67, 3177-3180.
’raylor, G . I. (1921). DitTusion by continuous movcmenls. Proc. London Murh. Sot.. 20, 196 212.
consider. Emissivity of the sea surface and attenuation of infrared radiation
during passage through the air will affect the readings of the radiometer. For
instance. the infrared imagery of the sea surface polluted with pulp sewage
from a factory is quite different from one not polluted, even though the
temperature is not so different between them (see Ochiai, 1973). In the
present experiment, therefore, the sea-surface temperature was directly
measured at several points. In addition, attention was paid so that reflection
of the sunshine would not spoil the readings.
The diffusion of thermal pollution is more or less affected by air temperature, wind velocity, depth of the sea, current velocity, exhaust velocity of the
pollution, and other factors. However, since these were measured at only a
few points in the present study, the data are not enough for analysis. This is a
problem to be solved in the future.
Lastly, it should be pointed out that the plume of thermal pollution here
studied is “instantaneous,” and the diffusion coefficient obtained from it
may be different from that averaged for some time (e.g., Ito, 1972).
REFERENCES
lio, S. (1972). The atmospheric diflusian in the hori7,ontal direction in relation to finite sampling
period. J . Afereorol. SOC. Jup. 50. 5Y- 64.
Ochi~i. M. (1973). On aerial measurement of infrared imagery of sea surface with infrared line
scanner. J . Ocrunogr. Sot,. Jap. 29. 8 . 15. (In Jap. with Engl. ahstr.).
Okuho. (2. (1970). Oceanic turbulence and diffusion. In “Oceanic Physia“ (J. Masuzawa, 4.)
pp. 265 -381. Tokai Univ. Press, Tokyo. (In lap.).
Onnidov. R. V. (1968). *’ Horizontal Turbulence and Turbulent Exchange in the Ocecin.” 199
pp. Nauka, Moscow. (In Russ.).
Richardson. L. t;. (1926). Atmospheric diffusion shown on a distance-neighbour graph. Pro(,.
H ~ J ~ s .
Soc. Scr. A 110. 709 - 737.
Stewiiri, K. W.. and Grant, 14. L. (1961). Delerniination of the rate of dissipation of turbulent
cncrgy near the sen surfuce in the preseiw of waves. J . Cuophys. Rcs. 67, 3177-3180.
’raylor, G . I. (1921). DitTusion by continuous movcmenls. Proc. London Murh. Sot.. 20, 196 212.