Acid Rain Research: Do We Have Enough Answers? by J.W. Erisman, G.J. Heij

By J.W. Erisman, G.J. Heij

Representing the complaints of the foreign Speciality convention ''Acid Rain study; can we have sufficient answers?'', this publication offers a helpful end to the coordinated study on acidification within the Netherlands from 1985 to 1994. The ebook specializes in atmospheric deposition, results of acid deposition on wooded area ecosystems within the Netherlands, and destiny acidification study. particular realization is given to: trace gases; ammonia; and particle deposition; and the final evaluation of deposition lots to ecosystems and soils is usually discussed.

This quantity may be important to environmental scientists, ecologists, and people considering atmospheric science/pollution

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The m e a n daytime deposition velocity of O3 was around 4 m m s -1 in both periods and the m e a n nighttime deposition velocity was 1 mm s -1 in April and 2 m m s -~ in May. A m a x i m u m of around 7 mm s -1 was found in both periods. The surface resistance to 03 show a diurnal pattern in both periods, although it is more pronounced in the second period (figure 4 and table 1). The daytime m i n i m u m lies around 200 s m -~. The effect of the beech leaves is seen most clearly in the fluxes of CO2, whereas the effects on the fluxes of 03 and NO2 are much less than expected.

These functions were derived from measurements carried out at the site [4]. A height dependent correction factor a was used to correct the flux-profile functions @ for heat given by Dyer and Hicks [ 5 ] : 23 Since then the forest has grown by a few metres. As a consequence the values for the zero plane displacement height d will have changed. a and 3. 1. Descriptionof the site The measurements were carried out in a roughly 30 year old Douglas fir stand [2]. 5 ha. It is surrounded by oak and larch.

Temperature dependence When sampled air enters the monitors, its temperature quickly takes the temperature inside the box housing the monitors. This implies, that significant errors might be expected, when the temperature inside the box suddenly increases or decreases, which happens sometimes as a result of rapid change in sun radiation at sunset or sunrise. When the temperature dependence of both the scanning and the reference monitor is exactly the same, the error in Ac is 0. 12% K 1 in the range of 5 to 40~ The error in Ac per K temperature change can be estimated from errAc = C (St,S--~ r,r) (I-~-~) (5) where 5r~ and 5r~ are the temperature dependence of the scanning and the reference monitor, respectively.

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