. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 396 Bl'LLETlX: MUSEUM OF COMPARATIVE ZOOLOGY. raised as surface temperature is lowered by the upwelling of cold saline waters consequent on the several northwest gales already men- tioned, or by the mixing of the upper few fathoms by wave action. An excellent example of the effect of the latter is afforded by two successive stations, April 26 and 29, a few miles outside the Isles of Shoals. On the former day the surface salinity was , when a northeast gale and heavy sea mixed the water sufficiently to
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 396 Bl'LLETlX: MUSEUM OF COMPARATIVE ZOOLOGY. raised as surface temperature is lowered by the upwelling of cold saline waters consequent on the several northwest gales already men- tioned, or by the mixing of the upper few fathoms by wave action. An excellent example of the effect of the latter is afforded by two successive stations, April 26 and 29, a few miles outside the Isles of Shoals. On the former day the surface salinity was , when a northeast gale and heavy sea mixed the water sufficiently to raise the surface to , and to lower the 15 fathom salinity from to , the bottom salinity remaining the same (fig. 5), the fact that the average salinity of the entire column of water had FATH. n '"30 ! . 1 . 1 31*. 1 1 . 6 . I 32*.. 2 i . 5 8 33%. 2d \ 5V\ r I W r 5 B W. w. 48 W. \ \ \ in \ 1 — \ \ \ K N\ \ 1 \N \ ?{| \ \ \\ 01 \ \ 25 v \ \\ V \\ 1j \\ \ v , I A \ 35 \\ 1 4(1 Fig. 5.— Salinity sections near Boon Island March 29 (Station 5 W. W. Welsh); April 5 (Station 8 W. W. Welsh); and April 25 (Station 18 W. W. Welsh); and east of the Isles of Shoals, April 26 (Station 19 W. W. Welsh) and April 29 (Station 20 W. W. Welsh). risen only from 32%0 on the 26th to on the 29th showing that there had been very little influx of salt water from off shore. The effect of a northwest wind, with consequent upwelling of bot- tom water, is illustrated by the sections for April 16 and 22 (Stations 13 and 16 Welsh, fig. 6), which show how the salinity of the entire column of water was raised by this process (mean salinity, Station 13 Welsh, : Station 16 Welsh, ), though most markedly near the surface. And the fact that the rise is evident at the bottom (25 fathoms) shows that the influence of the wind causes an inshore movement of bottom water from greater depths further to the east, while the next salinity section (Station 17 Welsh, fig. 6) s
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