Dewfall measurements on Lanzarote, Canary Islands

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Abstract:

At Lanzarote, Canary Islands, condensation is considered to play a significant role in the water budget of fields mulched with porous volcanic products ("Picón"). Here, 68 nights of gravimetric condensation measurements with mulched and bare surfaces, along with meteorological measurements were carried out. Results presented here indicate two major findings of interest with respect to general assumption: Firstly, nocturnal condensation on the mulch surface is lower than on a dry bare (loam) soil surface. A slightly higher nocturnal cooling of the mulched surface, and resulting higher dewfall in the strict sense, is overcompensated by the stronger hygroscopic properties of the soil. Secondly, dewfall, though otherwise consistent in magnitude and meteorological dependency with empirical and theoretical knowledge in literature, can still be observed at high wind speeds (ū ≈ 10 m sat 10 m a. g. l.) in northern to north-eastern trade winds that carry moist air from the sea. Dewfall to the mulched surface was observed in 39 of the measurement nights with a mean nocturnal sum of 0.07 mm.

German
Eine auf der Kanarischen Insel Lanzarote weitverbreitete Feldbaumethode nutzt poröoses vulkanisches Auswurfmaterial ("Picón") als Mulchdecke; dabei wird unter anderem eine bedeutende Rolle der nächtlichen Kondensation für den Wasserhaushalt angenommen. Erste Ergebnisse gravimetrischer vergleichender Kondensationsmessungen an unbedecktem und gemulchtem Boden während 68 Nächten zeigen: Zum einen bleibt die Kondensation in der vulkanischen Mulchdecke hinter derjenigen an unbedecktem Boden (Lehm) zurück, obwohl sich erstere nachts geringfügig stärker abkühlt, woraus ein höherer Tauabsatz folgen müsste. Die stärkere Hygroskopizität der trockenen unbedeckten Bodenoberfläche u¨berkompensiert jedoch diesen Einfluss. Zum anderen konnte der ansonsten in Höhe und Wetterabhängigkeit dem allgemeinen theoretischen und empirischen Kenntnisstand entsprechende Tauabsatz auch in windstarken Nächten (ū ≈ 10 m s–1at 10 m Messhöhe) nachgewiesen werden. Insgesamt wurde in 39 Nächten Tauabsatz auf der picónbedeckten Oberfläche festgestellt, in denen sich eine mittlere Nachtsumme von 0,07 mm ergab.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2004/0013-0405

Publication date: October 1, 2004

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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