January 1972 resulted in a more complete version of the Plan. Future 

 revisions will be handled on an ad hoc basis. 



^u>c!EL^^^^->^^ -iixa&akit^ t 



Activity 



1971 1972 1973 

 J \ I 



1974 1975 



I 



1976 1977 



Develop Technical Plan 

 Prepare for Field Program 

 Field Year Operations 

 Engineering, Tests & Data 



System Comparisons 

 Data Management— Archive 

 Analysis 



Fig. 1 U.S. IFYGL Schedule 



Table 3.— IFYGL technical plan 



Contents 



projects, objectives, products, approach 



systems, elements, characteristics, 



deployment 

 detailed observational procedures, 



schedules 

 policies, procedures, facilities, data 



products, schedules 



Experimental field projects have been given major emphasis in 

 IFYGL. These projects w^ere undertaken to ascertain the important 

 large-scale spatial and temporal processes in Lake Ontario and the 

 Ontario basin and are referred to as budget or balance projects. They 

 include materials balance, heat balance, terrestrial water balance, 

 and atmospheric water balance. The objective of the materials 

 balance project is to determine the amounts and forms of materials 

 entering, leaving, and residing in Lake Ontario, with emphasis on 

 basic plant nutrients and, to a lesser extent, on heavy metals. The 

 Lake heat balance project will determine the form, amount, and 

 seasonal variation of water entering, leaving, and stored in Lake 

 Ontario and the Ontario basin. The atmospheric water balance 

 project will determine the magnitude of the terms in the atmospheric 

 water balance equation and their contribution to the hydrologic 

 cycle of Lake Ontario. 



Experimental projects also address the small-scale natural 

 distribution and variability of budget terms, parameters related to 



141 



