Source 
Defant 
(Reference No. 6) 
a0 
$1 
Dietrich 
(Reference No. 7) 
Diurnal Variation (°C.) 
0.4 
1.0 
2.0 
0.1 
0.87 
0.25 (Average) 
0.16 to 0.40 (Range) 
.04 (Average) 
*,03 to .09 (Range) 
0.22 (Mean) 
0.30 (Mean 
Maximum) 
(Summer) 
0.14 (Mean) 
0.31 (Mean 
Maximum) 
(Summer) 
0.83 (Mean) 
1.34 (Mean 
Maximum) 
(Summer) 
13 
Comments 
Average surface variationin 
the open sea. 
Value to which variations 
may rise in clear, calm 
weather over the open ocean. 
Diurnal values may exceed 
this value in lakes away 
from the shore at _ the 
surface. 
Diurnal variation at 4-6 
meters in lakes away from 
the shore. 
Surface variation in the Gulf 
of Trieste (enclosed basin 
close to the land) .. MERZ 
(1911). 
Surface diurnal variation 
from Meteor Expedition 
observations between lati- 
tudes 12 1/2°N. and211/2°S. 
Diurnal variation at 50 
meters -—- Meteor Expedition. 
North Sea--deep water, 
North Sea--deep water, 
Gulf of Finland--deep water. 
Gulf of Finland--deep water. 
Shallow water near Newquay 
England, Atlantic Ocean. 
