Dew contribution to the annual water balances in semi-arid desert valleys

Malek, Esmaiel; McCurdy, Greg; Giles, B.

doi:10.1006/jare.1999.0506

Cited by 116 publications

(91 citation statements)

References 16 publications

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“…Its determination is of importance in different areas. In agriculture, dew can either bring moisture to plants (Duvdevani, 1957(Duvdevani, , 1964Zangvil, 1996;Malek, 1999;Ninari & Berliner 2002;Kidron et al 2002;Agam and Berliner, 2006;Berliner et al, 2006;del Campo et al, 2006;del Prado & Sancho 2007;Rao et al 2009;Limm and Dawson, 2010;Kidron et al, 2011;Zhuang et al, 2012;Kidron and Temina, 2013;Ucles et al, 2013) or favor the development of pathogenic germs (Goheen, 1988;Pitblado et al, 1988;Sriva et al, 1993;Franci et al, 1999;Luo et al, 2000). Dew can have a corrosive action on external structures and even on car paints (Schulz and Trubiroha, 1995).…”

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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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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“…Many studies (Abraham 1996;Zangvil 1996;Jacobs et al 2000;Wang and Zhang 2011) have reported that considerable dewfall exists in arid and semi-arid areas; the mean daily dewfall can exceed 0.1 mm. Thus, dewfall is a major water source for vegetation survival (Zhang et al 2007), and in several cases, the amount of dewfall can exceed that of rainfall during the same time period (Malek et al 1999). Furthermore, Zhang et al (2003) suggested that the phenomenon of "water respiration" from surface soil may occur in extremely arid regions, with condensation during the night and evaporation during the day.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Dew Formation and Distribution, and Its Contribution to the Surface Water Budget in a Semi-arid Region in China

Qiang

Wang²,

Yang³

et al. 2014

Boundary-Layer Meteorol

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Observations in the semi-arid Loess Plateau area of north-west China are utilized to reveal the characteristics and variations in the seasonal distribution of dewfall (frost) and the influence of micrometeorology, precipitation, and other weather conditions. Precipitation is the dominant water source in the Loess Plateau; however, non-rainfall water accounts for 13 % of the total land-surface water source. Dew is the second largest non-rainfall component next only to soil adsorption water. Observations show that dew (frost) occurrence is likely to occur when an inversion occurs between the heights of 1 and 4 m with a temperature difference of 0.25 K, surface wind speed of 1.5 m s −1 , and surface relative humidity greater than 80 %.

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“…The exchange process of water between the soil surface and the atmosphere plays an important role in arid regions (Malek et al 1999), especially during lengthy rainless seasons. In this period dew (and sometimes fog, depending on the location) is the only source of water.…”

Section: Introductionmentioning

confidence: 99%

An Automated Microlysimeter to Study Dew Formation and Evaporation in Arid and Semiarid Regions

Heusinkveld

Berkowicz

Jacobs

et al. 2006

Journal of Hydrometeorology

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The development of a simple and low-cost portable weighing microlysimeter that makes use of a load cell for automated recording and for studying daily dew formation, rate of accumulation, and subsequent evaporation in arid or semiarid regions during rainless seasons is presented. The sampling cup is 3.5 cm deep, with the load cell itself situated at 20-cm depth to minimize temperature effects. The device was tested in a sand dune experimental station situated near Nizzana, northwest Negev Desert, Israel, during which extensive micrometeorological measurements were collected. One microlysimeter was placed in a playa and a second was installed on the stabilized midslope of an adjacent linear sand dune. To assess the performance of the load cell microlysimeters (LCM), one pair of manual microlysimeters was installed next to each LCM. A third pair was installed at a point between the LCMs and a fourth pair above the midslope LCM. Sixteen overnight measurements were carried out within a 6-week period. The LCM could measure dew with an error of Ϯ0.02 mm. The daily dew variation in the samples during the 16 overnight measurements ranged up to 0.2 mm on stable dune slopes but up to 0.4 mm on the playa. This difference is attributed to the playa's high silt and clay content and salinity. Dew formation and accumulation were found to occur long before the soil-surface temperature reached the dewpoint temperature of the air. The cost of building this microlysimeter, excluding labor, is about $175 (U.S.).

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Dew contribution to the annual water balances in semi-arid desert valleys

Cited by 116 publications

References 16 publications

Dew observed on cars as a proxy for quantitative measurements

Dew observed on cars as a proxy for quantitative measurements

Characteristics of Dew Formation and Distribution, and Its Contribution to the Surface Water Budget in a Semi-arid Region in China

An Automated Microlysimeter to Study Dew Formation and Evaporation in Arid and Semiarid Regions

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