The vegetation of a desert mountain range as conditioned by climatic factors . less sharp, and that from 5,000to 6,000 still less sharp and exactly equal to the angle of rise from 6,000to 7,000 feet. The stations at 8,000 and 9,000 feet are located at thewest end of the main ridge and are consequently not in line with thelower stations. The sharp rise in elevation between the 3,000 and 4,000foot stations is doubtless partially accountable for the rapid increaseof rainfall between them. The steep rise of the rainfall graphs between6,000 and 7,000 feet may indicate an influence due to the positi
The vegetation of a desert mountain range as conditioned by climatic factors . less sharp, and that from 5,000to 6,000 still less sharp and exactly equal to the angle of rise from 6,000to 7,000 feet. The stations at 8,000 and 9,000 feet are located at thewest end of the main ridge and are consequently not in line with thelower stations. The sharp rise in elevation between the 3,000 and 4,000foot stations is doubtless partially accountable for the rapid increaseof rainfall between them. The steep rise of the rainfall graphs between6,000 and 7,000 feet may indicate an influence due to the position ofthe 7,000-foot station on the north rim of Bear Canon, with a veryabrupt wall immediately below it. There is no topographic cause,however, to which it is possible to attribute the dip in the rainfallcurves for 6,000 feet in 1911 and 5,000 feet in 1912. In order to institute a comparison between the mountain gradientsof rainfall and those of the valley stations of the Weather Bureau thedata have been collated which are expressed in the curves of figures 7 SHREVE Plate A. SANT>\ Cfi-O^ vAiL ^>^/ n,.stBti< r%. 2lL 110° 40 IS , s ,r«, TOPOGRAPHIC MAP or THE SANTA GAEATilNA MOUNT.\m S 3ir mtervTil 1,000 feet CLIMATE OF THE SANTA CATALINA MOUNTAINS. 57 and 8. These figures compare the summer rainfall curves of the SantaCatalinas and those of selected stations for the same summers. Infigure 7 the rainfall of July, August, and September 1911 has been used,for 13 stations located in southeastern Arizona, east of Phoenix andsouth of Fort Apache. The rain has been averaged for each group ofstations lying within the same thousand-foot interval of 8 shows the curve for the Santa Catalinas for 1912 and the curvefor 21 stations in the same area. A single record above 5,000 feet hasbeen available for this curve, that at Chlarsons Mill, in the PinalenoMountains. The significance of the comparison of these rainfall records for asingle season is entirely d
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
