| 释义 |
Penman, n.2 Agric. and Meteorol.|ˈpɛnmən|
The name of Howard Latimer Penman, 20th-cent. British agriculturalist, used attrib. and in the possessive to designate a formula proposed by him (1948, in Proc. R. Soc. A. CXCIII. 120) for calculating the rate of evapotranspiration of water from vegetated land under given environmental and meteorological conditions.
1952Austral. Jrnl. Sci. Res. A. V. 328 An objection which holds..against Penman's derivation, is the neglect of the difference between water and air temperature in determining the radiation loss from the pond. 1954R. T. Pearl et al. Calculation of Irrigation Need (Ministry of Agric. Techn. Bull. No. 4) 14 All the weather data required in Penman's formulae are recorded on the actual site.., and the full calculations made and applied at 7–30 day intervals according to Penman's formula. 1960Jrnl. Geophysical Res. LXV. 3393/2 (heading) Penman equations. 1976Physics Bull. Dec. 548/3 The ‘Penman equation’ and its derivatives are now applied routinely throughout the world to estimate the irrigation needed for crops. 1982Barry & Chorley Atmosphere, Weather & Climate (ed. 4) ii. 60 The annual evaporation over Britain, calculated by Penman's formula, ranges from about 38 cm..in Scotland to about 50 cm..in parts of south and south-east England. |