Total berg mass= total berg volumeXberg density 

 These calculations were perfonned for the study 

 berg and the tabulated results are shown below 



28 April 



Volume Mass 



707,300m' 636,570X10' kg. 



6 May 



Volume Mass 



624,200m3 561, 780 X 10' kg. 



The above calculations detennine that a change 

 of 12 percent took place over an S-day period. 

 The accuracy of these calculations is based on the 

 accuracy of measurement and the precision of 

 construction of the topographic map of the berg. 

 Because a good deal of artwork is involved, the 

 precision of construction probably contributes 

 most of the error. For this reason, tlie work done 

 on size measurements performed this year are 

 believed to have a probable error of 5 percent and 

 could be as high as 10 percent. Because of this, 

 and the small mass change, more frequent topo- 

 graphic maps were not prepared. 



Referring to the statistical approacli, this study 

 berg is difficult to categorize. The air tempera- 

 tures are cold showing a mean of about 1.1° C. 

 with a general rise to a maximum of 5° C. to- 

 wards the end of the survey. This air temperature 

 rise is reflected in the sea water temperature at 

 the surface. In order to determine the deteriora- 

 tion constants S or G, the melting of the berg 

 above the water and below the water must be 



quantitatively tagged. As pointed out in the 

 previous sections, this can only be done by elimi- 

 nating one of the melting environments, i.e., 

 obtain a berg in a cold water, w.rm air or warm 

 water, cold air environment. Unfortunately, 

 this study berg falls into a cold water, cold air 

 category where little deterioration can occur. 

 The water is as cold as can be expected any time 

 of the year and the air is only slightly above 

 freezing, but the berg did change its mass 12 

 percent in 8 days. As the berg deteriorates its 

 overall surface area will be reduced. If environ- 

 mental conditions are held constant and similar 

 to the first 8 days, the observed volume loss of 

 1.04X10* m'/day would diminish due to a di- 

 minished surface area for heat transfer. However, 

 if it is assumed that in the extreme case this rate 

 will remain constant, a minimum of 70 days woidd 

 be required for this berg to deteriorate. The 

 true situation is that because of the reduced sur- 

 face area and therefore reduced heat transfer 

 much longer would be required to melt the berg. 

 This berg would be considered as nondeteriorating 

 in terms of significant changes over a 1- or 2-week 

 period. It is therefore impossible to tag the 

 cause of the observed limited deterioration or to 

 calculate either of the deterioration constants 

 relating to the air or water environment. 



The study conducted did demonstrate that 

 more severe difl^erences must exist in the bergs 

 environment to allow computation of the desired 

 constants. It also provided for the development 

 and improvement of the mapping technique 

 employed. 



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