| OCR Text |
Show 43 4. The salinity of the surface water 5. The surface area of the Lake at each particular level 6. Wave activity on the Lake which is related to wind speed and the stability of the atmosphere 7. Moisture content of the atmosphere over the Lake ( relative humidity, dew point or vapor pressure) 8. Wind speed and direction as related to: ( a) katabatic winds, ( b) changes in temperature of the air mass with changes in wind direction, ( c) changes in moisture content of the air mass with changes in wind directions, ( d) position or location on or near the Lake, and ( e) topographic influences 9. Effects of solar radiation and cloud cover on evaporation rates 10. Turbulent exchange of moisture as related to the stability of the atmosphere, sensible heat and condensation nuclei It should be recognized that most of these elements are interdependent and changes in one element usually result in modification of others. Unanswered questions relating to the influence of the Lake on the micro- climate are: 1. What are the effects of annual changes in the Lake level on evaporation rates? 2. What effect does the Lake have on moderating the temperature extremes of land areas adjacent to the Lake? Some scientists believe that this effect is limited to a distance of only 5 to 10 miles from the shore and others feel that the Lake's influence can be found over much of the valley. How far from the Lake can its influence be observed? 3. To what extent does the air- water interaction represent a major portion of the heat budget of the area? It appears that during periods with strong inversions there may be an appreciable transfer of moisture from the air to the Lake surface in the form of sublimated moisture. How much of the moisture in the Lake is gained from this source? 4. Brine temperatures of 25 degrees Fahrenheit have been observed at the same time that the air temperatures are well below zero, especially during the winter months. What is the specific heat of the brine versus that of pure water? How much energy can the Lake supply to moderate these cold temperatures? |
