Objective analysis of humidity by the optimum interpolation method
Open Access
- 1 April 1981
- journal article
- Published by Stockholm University Press in Tellus
- Vol. 33 (2) , 113-122
- https://doi.org/10.1111/j.2153-3490.1981.tb01737.x
Abstract
Covariances and correlations of the humidity mixing ratio are calculated which are necessary for the construction of an objective humidity analysis scheme with the optimum interpolation method. The statistics are derived for winter and summer and for three levels, 850, 700 and 500 mbar. It appears that the best description of the humidity correlation function is a function of the form ?0 exp (–bs), s being the distance between two locations. The constants ?0 and b are dependent on the season, level, and guess field used in the analysis. A representative value for b-1 is 400 km. From the determination of ?0, which varies between about 0.5 and 0.9, one obtains a quantitative impression of the observation error. The results obtained are used in a humidity analysis system and examples of analyses of the absolute humidity are given. DOI: 10.1111/j.2153-3490.1981.tb01737.xKeywords
This publication has 5 references indexed in Scilit:
- Testing a Global Multivariate Statistical Objective Analysis Scheme with Observed DataMonthly Weather Review, 1976
- Some Experiments with a Multivariate Statistical Objective Analysis SchemeMonthly Weather Review, 1975
- Ein Verfahren zur numerischen Analyse der relativen FeuchteArchiv für Meteorologie, Geophysik und Bioklimatologie Serie A, 1974
- The objective analysis of relative humidityTellus A: Dynamic Meteorology and Oceanography, 1974
- Data Assimilation by Statistical Interpolation of Forecast Error FieldsJournal of the Atmospheric Sciences, 1972