On The Temperature-Humidity Correlation And Similarity |
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| Authors: | H A R De Bruin B J J M Van Den Hurk L J M Kroon |
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| Institution: | (1) Meteorology and Air Quality Group, Wageningen University, Duivendaal 2, 6701 AP Wageningen, The Netherlands;(2) Royal Netherlands Meteorological Institute, De Bilt, The Netherlands |
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| Abstract: | The correlation coefficient between temperature and specific humidity (rTq) is considered. A brief literature review as well as experimental data reveals that there is evidence that the eddy diffusivities for heat and water vapour are not equal if |rTq|  1. Several conditions under which this can occur are discussed. It is concluded that if non-local effects are of the same order as local effects T and q will behave in a non-similar fashion. Moreover, it is shown that if |rTq| = 1, temperature and specific humidity both will obey Monin–Obukhov similarity. In addition, based on that derivation, a new method is presented to determine the Bowen ratio from the T - q correlation. A first test of this new Bowen ratio regression method is presented. It is recommended to use rTq as a diagnostic tool to judge whether T-q similarity holds. |
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| Keywords: | Temperature-humidity similarity Bowen ratio regression method Non-local effects Violation of Monin– Obukhov similarity |
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