An empirical method for estimating long-wave radiation exchanges in the British Isles

摘要: From radiation measurements at Kew Observatory (tabulated by Lonnqvist), the effective emissivity of atmosphere e, defined as ratio incoming long-wave to black-body screen temperature, can be related optical path m (cm) With standard deviation ± 0·018. The relation between and surface vapour pressure e (mb) found from Belasco's (1952) air mass analysis is giving almost same Brunt's equation Benson data. Net L over short grass calculated where c fractional cloudiness; σTA temperature; ΔL1 a correction for difference TA cloud-base ΔL2 radiative temperature. Roach's data, = – 18 cal cm−2 day−1 varies with season 12 (December) + 20 (June). Throughout British Isles, annual mean 0 close 200 day−1, real values c Estimated net (total) 29 k little variation Isles.