Estimating dew yield worldwide from a few meteo data

Beysens, Daniel

doi:10.1016/j.atmosres.2015.07.018

Cited by 87 publications

(115 citation statements)

References 29 publications

(41 reference statements)

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“…High correlation of dew with RH (R 2 = 0.89) and path analysis result indicate that RH was an important factor in controlling dew. This result is similar to previous reports [5,32,34,54]. We found that dew was low and approximately constant at RH below 75%, and increased sharply when RH exceeded 75%.…”

Section: Control Of Dewsupporting

confidence: 82%

Dynamics of Dew in a Cold Desert-Shrub Ecosystem and Its Abiotic Controls

et al. 2016

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Abstract:The temporal dynamics of dew formation in cold desert-shrub ecosystems are still poorly understood. We examined dew and its abiotic controls in a shrubland in northwestern China with continuous eddy-covariance measurements of latent heat fluxes gathered over the growing-season of 2012. The dew amount was larger in mid-summer than in spring and autumn, but the dew duration was shorter in summer (from~10:00 p.m. to~6:30 a.m.) than in spring and autumn (from~8:30 p.m. to~7:30 a.m.). Dew occurred on 85% (166 days) of growing-season days, with monthly means ranging from 0.09 to 0.16 mm day´1. Dew was dominantly and positively controlled by Relative Humidity (RH), which explained 89% of its variation. Soil heat flux (G), air temperature (T a ), wind speed (W s ), Soil Water Content (SWC) and Vapor Pressure Deficit (VPD) also influenced dew formation. The most favorable conditions for dew formation were at T a < 17˝C and RH > 75%. The Penman-Monteith equation predicted actual dew reasonably well. The predicted growing-season dew amount (21.3 mm) was equivalent to 7.2% and 8.9% of corresponding rainfall and evapotranspiration, respectively. It is suggested that dew could be a stable and continuous source of water that helps desert plants survive during warm summers.

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Section: Control Of Dewsupporting

confidence: 82%

Dynamics of Dew in a Cold Desert-Shrub Ecosystem and Its Abiotic Controls

et al. 2016

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“…Theoretical calculation regarding the upper limit of the dew amount points to an upper limit, which depends on the condensation rate and duration. According to , the upper theoretical value under natural condition is 0.5 mm, whereas average maximum dew yield, as analysed for many locations throughout the world, is 0.37 mm (Beysens, 2016). According to Monteith (1957), it may reach up to 0.45 mm on natural substrates.…”

Section: Non-rainfall Water: Definition and Measurement Techniquesmentioning

confidence: 99%

Measurements and ecological implications of non‐rainfall water in desert ecosystems—A review

Kidron

Starinsky

2019

Ecohydrology

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The current review focuses on the contribution of non-rainfall water (NRW) to arid and semiarid regions (with a focus on the Negev), where NRW may provide a constant source of water that may facilitate the survival of different organisms, especially microorganisms. Factors that determine the amounts of NRW and the contribution of NRW to plants and organisms are discussed. Nevertheless, although important, significant variation exists regarding the amounts of NRW, which may stem from improper use or inherent drawbacks of some of the measurement devices. This may lead to erroneous conclusions regarding the possible role played by NRW. For instance, with prokaryotes (bacteria and cyanobacteria) requiring liquid water (≥0.1 mm) for growth, small inaccuracies in NRW around this threshold may either lead to the conclusion that NRW is sufficiently high to facilitate their growth, or rather, is too low to facilitate their growth. Arguing that some of the devices used to measure NRW may greatly overestimate the amounts, the possible contribution of NRW to soil bacteria and cyanobacterial biocrusts is analysed. We suggest that although NRW may assist the growth and survival of mosses and some types of lichens (mostly non-crustose), no conclusive findings were thus far reported regarding the use of dew for cyanobacteria growth. The use of dew by cyanobacterial crust for growth should be critically examined, and the possibility that NRW may even result in a negative carbon balance for cyanobacterial crusts should be considered.

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“…The nocturnal yield h of a condenser of 1m 2 (or similar), inclined at 30° and thermally insulated from below can be written as follows (Beysens, 2016). In its simplest form where the measurement is made once perday, just before sunrise, one gets…”

Section: Relation Dew Yield -Observation Scalementioning

confidence: 99%

“…(see e.g. Agam and Berliner, 2006;Tomaszkiewicz et al, 2015;Beysens, 2016). Then, although the environment (tropical, dry, temperate, continental) and sky view will be the same for any condensers at the same location, the precise shape and materials of the condenser do matter, in particular its infra-red emissivity, shape and thermal characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dew observed on cars as a proxy for quantitative measurements

Beysens

Pruvost²,

Pruvost³

2016

Journal of Arid Environments

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We describe a simple method to obtain absolute dew determination in any environment, based on observing dew formed at sunrise on cars. Cars are used as dew condensers where dew yield varies on three different parts that nearly all car exhibits: roof top, windshield and window side. The presence or absence of dew at the sunrise at these particular positions provides an observation scale index n with 4 levels, which is used to quantify dew yield. We show that the index n is proportional to the condensed dew volume h (mm) as measured on a standard planar condenser, inclined 30 ° from horizontal, following h=Kn. The validation of this scale and the determination of K (= 0.067 mm within 20-30% uncertainty) is performed with long term experiments in different areas where dew is observed on several cars, either directly weighted on rooftops or calculated from meteo data. This method can thus be of great help to determine without sophisticated measurements or trained observers the dew potential in many places in the world, in particular in arid and semi-arid environment, where dew can help to answer water demand and means to evaluate the dew potential are often limited or lacking.

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Estimating dew yield worldwide from a few meteo data

Cited by 87 publications

References 29 publications

Dynamics of Dew in a Cold Desert-Shrub Ecosystem and Its Abiotic Controls

Dynamics of Dew in a Cold Desert-Shrub Ecosystem and Its Abiotic Controls

Measurements and ecological implications of non‐rainfall water in desert ecosystems—A review

Dew observed on cars as a proxy for quantitative measurements

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