http://www.cnr.it/ontology/cnr/individuo/prodotto/ID205112

Improving the performance of infrared reflective night curtains for warming field plots (Articolo in rivista)

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Improving the performance of infrared reflective night curtains for warming field plots (Articolo in rivista) (literal)

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Dan Bruhn, Klaus S. Larsen, Giovanbattista D. de Dato, Pierpaolo Duce, Pierpaolo Zara, Claus Beier, Inger Kappel Schmidt, Sønnik Clausen, Teis N. Mikkelsen (2013)
Improving the performance of infrared reflective night curtains for warming field plots
in Agricultural and forest meteorology (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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Dan Bruhn, Klaus S. Larsen, Giovanbattista D. de Dato, Pierpaolo Duce, Pierpaolo Zara, Claus Beier, Inger Kappel Schmidt, Sønnik Clausen, Teis N. Mikkelsen (literal)

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Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), DK-2800 Kgs. Lyngby, Denmark; DIBAF - Department for Innovation in Biological, Agro-food and Forest systems, University of Tuscia, Via San Camillo de Lellis, snc, 01100 Viterbo, Italy; Consiglio Nazionale delle Ricerche, Istituto di Biometeorologia - CNR-IBIMET, Traversa La Crucca 3, 07100 Sassari, Italy; University of Copenhagen, Forest & Landscape, Rolighedsvej 23, DK-1958 Frederiksberg, Denmark; Dept of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Walton Hall, Milton Keynes MK76AA, UK (literal)

Titolo

Improving the performance of infrared reflective night curtains for warming field plots (literal)

Abstract

Infrared reflective (IR) curtains have been widely used to obtain passive nighttime warming in field ecosystem experiments in order to simulate and study climate warming effects on ecosystems. For any field installation with IR-reflective curtains in an ecosystem the achieved heating effect depends on the heat gain determined by the stored energy during daytime (incoming radiation can be used as a proxy) the heat conservation determined by the IR-reflective effect of the curtains (cloudiness can be used as a proxy) and the heat loss determined by convectional heat loss (wind speed can be used as a proxy). In this study, we demonstrate some feasible avenues for improving the achieved temperature increase (?T) when using IR-reflective curtains at field scale by attacking the three main factors determining the efficiency of the curtains: (i) improving the long wave IR reflection by the curtains, (ii) insulating the curtains and (iii) reducing the lateral wind speed. We provide experimentally based replies to the major concerns raised in the literature about the passive nighttime warming method. We show (a) that using IR-reflective curtains during night does in fact not result in nighttime warming only as there is a small carryover (<0.5 °C) into the following daytime, and (b) although the employment of IR-reflective curtains at nighttime may alter the RH, it is a small change and not always in the same direction. (literal)

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