摘要:

AbstractThe empirical determinations of the similarity functions of geostrophic drag and heat transfer relations by Zilitinkevich and Chalikov (1968) and by Clarke (1970a, b) indicate large disparities between their results, raising serious doubts on the universality of these relations. Some reasons for these large differences are investigated by reanalysing the available data from the two sites (O'Neill in Nebraska, U.S.A., and Hay in New South Wales, Australia) in the same format, using the best available flux‐profile relations and reasonable criteria for the selection of suitable runs. Although there is still considerable (but, much less than in previous studies) scatter of data points, when plotted in the similarity framework, we find no significant differences in the results of two sites. Thus a large part of the above noted disparities must have been spurious, probably caused by different ways of determining surface fluxes and of defining external variables by the previous investigators.Our empirical results are compared with those obtained from recent theoretical models for both stable and unstable boundary layers. Having fitted some third degree polynomials through the same, nomograms are obtained for geostrophic drag and heat transfer coefficients and also for the surface cross‐isobaric angle as functions of dimensionless parameters defined in terms of easily measured ‘external’ variables. These show expected trends with st

ISSN:0035-9009    

DOI:10.1002/qj.49710142712

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

摘要:

AbstractExperimental evidence of air mass cooling in the laboratory by infrared radiative exchanges is given.The experiments were carried out in a 50m3chamber, with relative humidities less than 70%, in the absence of turbulent motions and haze. The measured values of the air temperature as a function of the height and time with decreasing floor temperature are compared with calculated values for which the radiative contribution is determined by the emissivity method.The difference, less than 10%, between experimental and theoretical coolings, gives evidence that the method of computing radiation flux divergence is sufficiently accurate for many meteorological purposes.

ISSN:0035-9009    

DOI:10.1002/qj.49710142713

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142714

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142715

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142716

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142717

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142718

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142720

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142722

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49710142723

出版商:John Wiley&Sons, Ltd    

年代:1975

数据来源: WILEY