Latitude.Basal Temp. (Water Zone).Ice Coeff.Land, West Coeff.Land, East Coeff.
Jan.a.
70 N.298.8- 0.49- 0.43- 0.20
60277.4- 0.07- 0.31- 0.01
50276.8- 0.09- 0.29 0.09
40282.5- 0.17 0.04
30289.6- 0.08 0.03
20294.2- 0.01- 0.01
10298.6- 0.01 0.03
0299.3 0.01 0.00
10 S.298.2 0.04- 0.01
20296.2 0.07 0.00
30293.5 0.06 0.03
40289.3 0.09- 0.03
July.
70 N.279.3- 0.16 0.02 0.02
60280.7- 0.01 0.11
50285.8 0.04 0.06
40291.1 0.05 0.07
30296.8 0.08- 0.01
20297.6 0.07 0.02
10298.8 0.03- 0.01
0298.6 0.02- 0.01
10 S.296.9 0.04- 0.03
20293.1 0.02- 0.02
30288.2- 0.01- 0.01
40284.0 0.00- 0.03

In the case of the calculation of the effect of comparatively slight and irregular changes in land and sea distribution in a limited area, such as those of the Littorina Sea referred to on p. 128, it may be found that a ten-degree circle is too wide an area to employ, the changes from land to sea at one point being nullified by changes from sea to land at another more distant point. In such a case a smaller unit such as a circle of five degrees radius can be employed. As a rough approximation it may be said that the effect of the conversion of a square mile of land into sea, or vice versa, on the temperature of a neighbouring point is inversely proportional to its distance. Since the area of a five-degree circle is one-quarter that of a ten-degree circle, while the average distance of the land composing it is one-half, we have to divide our regression coefficients by two in order to fit the new data.

This method was applied to obtain the probable temperature distribution on the shores of the Littorina Sea at its maximum extension, and gave results which agreed remarkably well with those calculated by geologists from the animal and plant life of the time.

See London Q. F. R. Meteor. Soc., 43, 1917, pp. 169-171.

INDEX


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