Part 6 of the chart section shows the normal values 

 of sensible heat transfer between ocean and atmo- 

 sphere, ^.s. A regular yearly cycle is also found in the 



monthly total heat exchange, Qi, was plotted for each 

 5° quadrangle and the annual average computed from 



series 



with maximum values occurring in (|^g equation Or 



November and December and rmnimum values in 

 May and June. Positive values of Qs (heat gained by 

 sea surface) occur in high latitudes from April through 

 September, reflecting the fact that air temperatures in 

 this region of the eastern North Pacific are warmer 

 than sea temperatures during these months. 



The yearly cycles in Qe and ^v reflect the fact that 

 sea-air temperature and vapor pressure differences 

 and observed wind speeds also have regular yearly 

 cycles with maxima and minima that occur at the same 

 times as those of the heat flux terms. 



Seasonal Variation of the Normal Total Heat 

 Exchange 



The seasonal variation of the 1961-71 normal 



_L 

 12 



2 Q,i, 



where / represents the month. Except in the near 

 coastal region of North America, the character of the 

 normal seasonal variation changes less with latitude 

 than with longitude. Therefore, for the oceanic region 

 lat. 20° to 50°N and long. 130°W to 180°. the seasonal 

 curves and the average annual values are shown here 

 for only three selected meridional strips. Plate 1 shows 

 the seasonal variation for each 5° quadrangle 

 in the longitudinal strip between long. 175°W and 

 180° at the western boundary of the area. Similarly, 

 Plate 2 represents the area between long. 150° and 

 155°W northward from Hawaii toward Kodiak, and 

 Plate 3 represents the area between long. 130° and 



400 



200- 



< 

 o 



CVJ 



I 



o 



CO 

 LlJ 



cr 

 o 



_j 

 <t 

 o 



-200- 



-400 



1 — I — I — I — I — I — I — I — I — I — r 

 40-45N I50-I55WJ 



Qt = 7 



J I I i I I I I I I L 



1 I I I I I I I I I n 

 _35-40N I50-I55W 



Qt =-9 



I I I I I 1 I I I I I 



JFMAMJJASOND 



JFMAMJJASOND 



JFMAMJJASOND 



400 



1 — I — I — I — I — I — I — I — I — I — r 

 L 30-35 N I50-I55W J 



200- 



-200 



-400 



Qt =15 



J — i_J i_i I I I I I I 



1 — I — I — I — I — I — I — I — \ — I — r 

 L 25-30N I50-I55W 



Qt =29 



J \ I I I I I I I I I 



JFMAMJJASOND JFMAMJJASOND JFMAMJJASOND 



MONTH 



Plate 2. — Seasonal variation of average monthly total heat exchange. Q,. by 5° quadrangles from lat. 20° to 50°N in the meridional strip long. 



150' to 155°W. Qj is the average annual total heat exchange. 



