34 METEOROLOGICAL RESULTS OF LAST CRUISE OF CARNEGIE 
Table 39. Results of Fourier analyses of mean diurnal variation of sea-surface temperature 
for groups, Carnegie, 1928-29 

Coefficients 
eae a a a a a 
Xe) °o ° oo ° 

2c 2) Cc Cc Cc Cc aC 
I -.038 + .033 -.098 +.034 -.098 + .022 + .027 +.014 
Il +.019 -.060 + .065 -.139 -.519 +.031 -.038 + .066 
Ul -.038 +.058 +.014 -.007 -.104 +.025 -.019 -.021 
IV -.169 +.031 -000 -.018 -.185 + .069 -.002 -.009 
V -.135 + .023 +.002 -.004 -.003 + .047 -.003 + .022 
aes -.072 + .027 +.013 +.004 -.005 -.003 +.005 -.013 
(a) -.148 +.014 -.005 +.015 -.048 + .063 -.006 +.009 
b -.052 -.027 + .003 -000 -.015. +.009 -.010 + .009 
VI -.220 + .049 + .033 -.009 -.118 +.011 + .002 -.001 
IX -.179 +.060 -.010 + .008 -.054 +.035 -.038 +.011 
X -.111 -.046 -.027 + .022 -.064 + .049 -.006 -.005 
XI -.087 +.018 +.001 -.009 -.148 +.105 -.017 -.013 
om + .002 +.021 +.008 +.010 -.092 + .040 + .N06 + .008 
} -.052 +.105 +.068 +.090 +.169 + .083 -.079 +.050 
(b +.131 -.076 -.003 -.028 -.194 -.307 -.177 +.066 
XIV + .037 + .008 +.013 + .002 -.045 + .033 -.021 -.009 
XV + .020 -.183 -.016 + .035 -.270 + .098 +.050 -.072 
XVI -.046 -.022 +.048 +.001 + .208 +.090 -.030 -.026 
XVII 
a -.008 -.051 +.037 -.007 -.141 + .086 -.021 -.011 
b -.095 + .050 -.013 -.008 -.029 + .009 -.015 +.013 
c -.039 +.017 +.006 -.015 + .076 + .042 -.035 + .004 
XVIII -.068 +.012 -.002 -.002 -.056 + .074 -.015 -000 
vs Amplitudes Phase angles 
rou 
eee ec ee |e ae 
5C “C 1c a es nC 1G 1G 2G 
I -105 -040 -102 -037 201.2 56.3 285.4 67.6 
Il - 734 -068 .075 .154 135.0 297.3 120.3 295.4 
10 -111 -063 -024 -022 200.1 66.7 143.6 198.4 
IV -251 -076 -002 .020 222.4 24.2 180.0 243.4 
Vv -135 -052 -004 -022 268.7 26.1 146.3 349.7 
va -072 .027 -014 -014 266.0 96.4 69.0 162.9 
iS .156 -065 -008 -017 252.0 12.5 219.8 59.0 
b -054 -029 -010 -009 253.9 288.4 163.3 360.0 
Vill .250 -050 -033 .009 241.8 77.3 86.5 263.7 
Ix -187 .070 -039 .014 253.2 59.7 194.7 36.0 
xX -128 -067 .028 .023 240.0 316.8 257.5 102.8 
XI 172 -107 .017 -016 210.4 Gleu/ 176.6 214.7 
ga .092 -045 .010 -013 178.8 27.7 126.9 51.3 
tR) sillrits .134 -104 -103 342.9 51.7 139.3 60.9 
b) .234 .316 clint .072 146.0 193.9 181.0 337.0 
XIV -058 .034 -025 -009 140.6 13.6 148.2 167.5 
XV .271 .208 -052 .080 175.8 298.2 342.3 154.1 
\ XVI" .213 -093 -057 .026 347.5 346.3 122.0 177.8 
XVII 
a .141 -100 -043 -013 183.2 329.3 119.6 212.5 
b -099 -051 -020 -015 253.0 79.8 220.9 328.4 
c -085 .045 -035 -015 332.8 22.0 170.3 284.9 
XVUlI .088 .075 -015 -002 230.5 9.2 187.6 270.0 
obtained similar results from data compiled during two 
summer months in the North Atlantic [32, p. 9]. He 
found that the mean séa temperature exceeded the mean 
air temperature on 68 per cent of the days of observa- 
tion. Moreover, his mean air temperatures were not 
corrected for overheating of the thermometers during 
daylight hours, and are undoubtedly too high fairly to 
represent air temperatures at similar heights above the 
sea surface. 
Sea- and Air-Temperature Differences 
A comparison of the daily means of sea and air tem- 
peratures, as obtained on the Carnegie, attests to the 
well-known fact that the sea surface is generally warm- 
er than the air during summer months. From the daily 
means of the entire cruise it was found that the mean 
sea-surface temperatures exceeded the mean air tem- 
peratures on 61.5 per cent of all days. Helland-Hansen 
