Sy, A. et al. (2002): Upper Ocean Climate Ship-of-Opportunity Programme of BSH - A Status Report 
19 
visible by the region of greatest horizontal gradients off the Grand Banks. Estimates of the 
locations of the front for every XBT section show lateral displacements of about +/- 30 nm, 
a zone of variability only half as wide as that found by Horne and Petrie (1988) from SST 
measurements. The corresponding field of standard deviation of heat content shows the 
intensified temporal fluctuations in this frontal zone area and along the path of the NAC (Fig. 11 
bottom). 
50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 
Longitude [°W] 
5 10 15 20 24 26 28 30 32 34 |6 38 40 45 50 
Giga-Joule/ni 
50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 
Longitude [°W] 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 
Giga-Joule/m 
Fiq. 11: Long-term average (top) and standard deviation (bottom) of heat content of 
upper 750 m calculated from XBT data 1988 - 2000.