Dew measurement by Eddy covariance and wetness sensor in a semiarid ecosystem of SE Spain

Moro, M.J.; Were, A.; Villagarcı́a, L.; Cantón, Yolanda; Domingo, Francisco

doi:10.1016/j.jhydrol.2006.11.019

Cited by 65 publications

(60 citation statements)

References 18 publications

(23 reference statements)

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“…We found that dew occurred on 85% of the nights during our study period, which is higher than other estimates of 33% to 78% [5,17,26,32,52,53]. The monthly mean dew amount was higher in mid-summer than spring or autumn (Figure 2) probably because rainfall was concentrated in mid-summer, increasing RH and decreasing VPD and thus enhancing dew.…”

Section: The Formation Characteristics Of Dewcontrasting

confidence: 58%

“…Over the growing season (196 days), dew occurred on 166 days, whereas rainfall occurred on only 29 days. These findings suggest that although dew amounts are relatively small in our study site, they are a stable and continuous source of water for ET in desert area [26]. Dew combined with rainfall as water input met the ET demand at our study site, thus maintaining the growth of desert woody plants.…”

Section: Contribution Of Dew To the Water Balancementioning

confidence: 54%

“…EC measurements of LE are subject to moderate uncertainty, and the measurement of nighttime flux is particularly challenging [26,50], The EC technique fails during periods of low wind speed at night and routinely under measures of LE at higher wind speeds, with energy-closure fractions of less than one [46]. To compensate for these problems, we have excluded calm nights from the analysis using a very conservative u˚threshold of 0.30 m¨s´1.…”

Section: Measurements Issues and Uncertaintiesmentioning

confidence: 99%

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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: The Formation Characteristics Of Dewcontrasting

confidence: 58%

Section: Contribution Of Dew To the Water Balancementioning

confidence: 54%

Section: Measurements Issues and Uncertaintiesmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2016

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“…Cooling by radiation deficit between the surface and the atmosphere is balanced with heating by conduction (solid surface contact), convection (with surrounding air) and condensation (water latent heat of condensation). Differences appear in the evaluation of the radiation deficit (either calculated from a sky model: Awanou and Hazoume, 1997 or measured with radiometers: Kalthoff et al, 2006;Moro et al, 2007;Maestre-Valero et al, 2012;Uclés et al, 2013) and the convection losses estimated from mass and thermal coupling coefficient (Pedro and Gillepsie, 1982;Jacobs et al, 2008). Measurements of surface temperature can also be performed as in Nikolayev et al, 1996.…”

Section: Introductionmentioning

confidence: 99%

Estimating dew yield worldwide from a few meteo data

Beysens

2016

Atmospheric Research

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“…For example, the frequency and duration of dew in Wageningen, Netherlands were 70% and 16.4 h/night, respectively, even though the amount of dew was quite small compared to the volume of precipitation (De Roode et al, 2010). The frequency and duration of dew events in the Negev Desert, an arid area, were 55% and 7.6 h/night, respectively (Zangvil, 1996); and in a semi-arid area such as Almería in Spain, the frequency and duration were 50% and 6.5 h/night, respectively (Moro et al, 2007).…”

mentioning

confidence: 96%

Characteristics of dew events in an arid artificial oasis cropland and a sub-humid cropland in China

Meng

Wen

2016

J. Arid Land

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Abstract:Dew is an important source of water which significantly influences the physiological status of vegetation and the microclimate environment. For quantifying the characteristics of dew events and analyzing the underlying mechanism of dew formation in different ecosystems, we measured, based on the flux-profile method, the amount, frequency and duration of dew events in two croplands, an arid artificial oasis cropland in Zhangye, Gansu province and a sub-humid cropland in Luancheng, Hebei province in China. The results showed that dew events were observed in a total of 69 days in Zhangye, which accounted for 59% of the growing season (from 28 May to 21 September, 2012), while 128 days in Luancheng, which accounted for 79% of the growing season (from 5 April to 13 September, 2008). The frequencies of dew events were 2.8 and 2.4 times of those of precipitation in Zhangye and Luancheng, respectively. In addition, the dew amount reached up to 9.9 and 20.2 mm in Zhangye and Luancheng, which accounted for 9.5% and 4.1% of precipitation, respectively. The average amount of dew was 0.14 and 0.16 mm/night in Zhangye and Luancheng, respectively and the duration of dew events ranged from 0.5 to 12.0 h in the two study sites. Dew amounts were associated with the gradient of atmospheric water vapor concentration and dew duration (P<0.001) in both the two sites. The result implies that dew events play a more important role in crop growth in arid areas in comparison to sub-humid areas considering the dew occurrence frequency and the amount per night.Keywords: dew amount; frequency of dew; duration of dew; flux-profile Citation: MENG Yao, WEN Xuefa. 2016. Characteristics of dew events in an arid artificial oasis cropland and a sub-humid cropland in

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Dew measurement by Eddy covariance and wetness sensor in a semiarid ecosystem of SE Spain

Cited by 65 publications

References 18 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

Estimating dew yield worldwide from a few meteo data

Characteristics of dew events in an arid artificial oasis cropland and a sub-humid cropland in China

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