National Geographic : 1913 Feb
Photo by R. R . Rivera. By courtesy of The University of Chicago Press and the Journal of Geology MOUNT COLIMA IN ACTION, MARCH 7, 1903 The column of ashes seems to reach to a height of 17 miles, or 89,760 feet. It is pre sumed that this notable eruption was largely responsible for the decrease in solar radiation noticeable in 1903 (see page 195). influenced the march of temperature in the United States. When we take the march of temperature for the whole world the apparent effect is not so strik ing, but in this case there are so many conflicting influences at work that it is perhaps too much to expect so good an agreement. In view of this slight preliminary study of temperatures, it seems to me that the question of the effect of vol canic haze on terrestrial temperature is well worth serious consideration. Although a large group of stations may, by their contrary local influences, mask the influence of the haze, I believe it will be found eventually that tempera tures are influenced perhaps as much as several degrees by great periods of hazi ness, such as those produced by the vol canoes of 1883, 1888, and r192. Certainly an agency capable of send ing vast clouds of dust to a height of 20 miles in the air, there to be distributed by the winds all over the world, and to remain in suspension for months or years, causing the decrease of the direct radiation of the sun by as much as 20 per cent, is a climatic influence not to be ignored.