Abstract

Abstract Rainfall, soil moisture, and soil and air temperatures were measured over five years on north and south aspects (about 25°slope) of a grazed pasture and on the exposed intervening ridge crest at Coopers Creek, North Canterbury (43° 15‘S) at about 380 m a.s.l. Solar radiation and wind were measured only on the ridge, and radiation received on north and south slopes was derived from ridge measurements. Potential evapotranspiration on all aspects was calculated from solar radiation and air temperature according to the Priestley and Taylor formula. Daily mean solar radiation on the ridge averaged 332 langleys per day with a maximum of 591 langleys per day in December and a minimum of 118 langleys per day in June. Over a year the north aspect received 80% more radiation than the south. North-west winds prevailed; windrun at 2.1 m above ground was usually over 200 km.d–1and occasionally was over 2000 km.d–1. Total potential evapotranspiration on the ridge averaged 1093 mm.a–1 with a maximum of 5...

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