Inertial subrange correlation between temperature and humidity fluctuations in the unstable surface layer above vegetated terrains |
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Authors: | W Kohsiek |
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Institution: | (1) Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands |
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Abstract: | Observations of the temperature-humidity cospectrum and correlation spectrum were made with a cold platinum wire and a Ly- hygrometer at 3.7 and 10 m above vegetated surfaces during unstable atmospheric conditions. It was found theoretically that a separation between the temperature and humidity sensors causes a drop-off of the correlation spectrum at wavenumbers > 0.3 –1. The observed drop-off follows the theoretical one reasonably well. Measurements made with the temperature sensor placed in the center of the Ly- gap reveal a % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaccaGae8NKby% kaaa!37B5!\f\]–5/3 dependence of the temperature-humidity cospectrum in the inertial subrange up to frequencies of 20 Hz. The drop-off at higher frequenties is thought to be caused by limitations inherent to the Ly- humidiometer. |
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