摘要: The tropospheric energy balance is examined in an effort to ascertain the diurnal variation of its components. The mean local diurnal temperature change in the 850-300mb layer was observationally determined using upper air data co... 展开 The tropospheric energy balance is examined in an effort to ascertain the diurnal variation of its components. The mean local diurnal temperature change in the 850-300mb layer was observationally determined using upper air data collected at 142Northern Hemisphere radiosonde stations. Temperature data from GATE, ATEX, BOMEX and LIE Experiments,and Operations Redwing and Hardtack in the Tropical West Pacific were also analyzed. Diurnal radiative cooling values are computed for specific geographical regions and the magnitude of the required diurnal warming for each region is determined. A large morning maximum and late afternoon-early evening minimum of tropospheric required warming is found in all the data sets. This is hypothesized to result from enhanced morning subsidence produced by larger nocturnal radiational cooling. 收起