ACCOMPLISHMENTS— U.S. AND CANADA 



The principal accomplishments to date have been: the completion 

 of the IFYGL planning documented in the 4-volume Technical Plan, 

 the completion of the data collection as planned from April 1972 

 through March 1973, and the publication of a quarterly IFYGL 

 Bulletin and three IFYGL Technical Manuals. Analysis of the data 

 has also began. 



The scope of the data collection is shown in Table 4. 



Table 4.— Magnitude of IFYGL data collection 



Observation systems and types of data No. of observations 



Buoys and towers; water currents, water temperature, 



air temperature, dew point, wind, pressure, 



radiation, precipitation 50 x 10^ 



Automatic meteorological stations: wind, temperature, 



dew point, radiation, pressure, precipitation . 8 x 10^ 



Radar and precipitation networks 30 x 10^ 



Rawinsonde soundings ' 2,000 



Ships; BT, O^ soundings 5,000 



surface meteorological data, water temperatures 3 x 10^ 



water samples (nutrients, heavy metals, 



chemicals) 4 x 10* 



biological (chlorophyll, zooplankton, biomass, 



phytoplankton, particle count, fish) 10* 



Aircraft: wind, air temperature, pressure, dew point, 



humidity, vertical fluxes, solar radiation, 



lake surface temperature, gamma radiation, 



multispectral radiation 1.3 x 10*^ 



Basin hydroJogic stations; stream gages, wells, soil 



moisture probes, snow courses, etc 2.6 x 10* 



Lake hydrologic stations; water levels, water temper- 

 ature, precipitation 1.1 x 10^ 



FUTURE ACTIONS 



The U.S. analysis activity will continue some 4 years beyond the 

 termination of Field Year operations (Figure 1). The IFYGL data 

 collection will be used to calculate the large scale budgets and to 

 define the natural distribution and variability that takes place in the 

 Lake and basin. To the extent feasible, this data collection will also 

 be used to explain natural distributions and variability and to 

 develop models of interactive processes. 



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