. JULY 1 AUG I SEPT | OCT | NOV | DEC | JAN | FEB | MAR \ APR ] MAY | JUNE | Fig. 5. Representative annual surface-temperature cycles for the plain of the shelf, after Klaehn (1911). For consideration of the bottom temperatures, which are more significant in relation to our trawled samples of fishes, we have only our own scattered observations to go upon, ^he actual %^^^^^^^^ eiven in Appendix I. It is obviously impossible to show typical seasonal curves, like those derived from Klaehn's monthly charts of surface temperatures, owing to the small proportion of these obser- vatLs that fall withi
. JULY 1 AUG I SEPT | OCT | NOV | DEC | JAN | FEB | MAR \ APR ] MAY | JUNE | Fig. 5. Representative annual surface-temperature cycles for the plain of the shelf, after Klaehn (1911). For consideration of the bottom temperatures, which are more significant in relation to our trawled samples of fishes, we have only our own scattered observations to go upon, ^he actual %^^^^^^^^ eiven in Appendix I. It is obviously impossible to show typical seasonal curves, like those derived from Klaehn's monthly charts of surface temperatures, owing to the small proportion of these obser- vatLs that fall within any one depth range over a reasonably restricted area. A single, partly hypo- Ih Ucal, curve for the intermediate region is shown m Tig. 6. With this as a rough guide it is possibl to perc ive some important features by simple inspection of the figures quoted in the Appendix. The seasonal cycle appears to be centred later in the year m the bottom water, with maximum tempera- Tre^i: Mich. I autumn and the first half of the winter there is much less dif^^^^^^^^^ between surface and bottom water than at other seasons; it is rarely more than 2 C. whereas in summer it usually amounts to some 4° C. This is due to intense mixing over the shelf m winter, aradrdescribed'by Deacon (.937, P- SD- ^ spring and early summer even in the -rthern -^^^^^^ some temperatures below 5° C. were recorded (lower than the winter values), but most of these were in fairly deep water well ofTshore.
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