Use the above graph of insolation at various latitudes and dates of the year to
ID: 298554 • Letter: U
Question
Use the above graph of insolation at various latitudes and dates of the year to answer the following questions. Average solar energy at the surface is indicated as calories/meter^2/day. Alameda is located at about 37 degree N latitude (which is only about 180 nautical miles south of 40 degree N). 40 degree N is clearly marked on the graph, so the data presented at 40 degree N is close enough to represent Alameda for our purposes. Valdivia is a town near the South Pacific coast of Chile, located at about 40 degree S (39 degree 49'S) What is the approximate difference in insolation between Alameda during June Solstice (when the subsolar point is located at 23.5 degree N, about 15 degree from 40 degree N) and Valdivia during December solstice (when the subsolar point is located at 23.5 degree S, about 16 degree from 40 degree S). Approximately how much insolation is received at 40 degree N during each equinox?Explanation / Answer
31. On seeing the graph we can see that on Alameda which is located near 40degree N lattitude, the insolation received in the June solistice will be approximately equal to that of 300 cal/meter2/day. Whereas the insolation recieved at Valdivia during december solistice will be approximately 460 cal/meter2/day. Therefore the difference between these two insolation is about 160 cal/meter2/day.
32. During the march equinox at 40 degree north the insolation received will be 700 cal/meter2/day. During the september equinox at 40 degree north the insolation received will also be equal to 700 cal/meter2/day. So there is no difference between the insolation received during the two equinoxes.
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