โ Scribed by R.P Hosker Jr.; C.J Nappo Jr.; S.R Hanna
No coin nor oath required. For personal study only.
Initial observations of the diurnal variation of the vertical thermal structure of a loblolly pine planation are presented. Results obtained in other forests are qualitatively confirmed. On a clear day a very unstable temperature gradient occurs above the trees, while a strong inversion (~8ยฐC) develops below the crowns. At night the sub-crown region becomes weakly unstable, but the atmospheric layer above the trees is then stable. On a rainy day, the strength of the temperature inversion beneath the tree crowns is less than 1ยฐC. The position of the daytime temperature maximum in the tree-tops responds to the solar elevation, eventually descending about 2 m to the region of maximum foliage density as the sun's rays penetrate deeper into the tree crowns. * WeatherMeasure custom-built air temperature profile measuring system. ** WeatherMeasure model W1034, WeatherMeasure Corp., Sacramento, Calif. 95841.
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