Analysis of the effect of meteorological factors on dewfall

Xiao, Hu; Meißner, Ralph; Seeger, J.; Rupp, Holger; Borg, Heinz; Zhang, Yuqing

doi:10.1016/j.scitotenv.2013.03.007

Cited by 22 publications

(20 citation statements)

References 19 publications

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“…Basic ideas and hypotheses regarding the hydration source model (Fig. 2) (Xiao et al 2013), increasing nocturnal cooling and thus increasing air humidity (e.g. Geiger 1950).…”

Section: Regional Scalesmentioning

confidence: 99%

“…Geiger 1950). A critical wind speed is needed to maximize dewfall rates; if wind is faster, which is often the case in coastal sites, condensation is offset by turbulent warming; if too slow, water for condensation cannot be replenished from humid air above (Oke 1987;Xiao et al 2013). Strong dew formation is thus more common in inland climates (Fig.…”

Section: Regional Scalesmentioning

confidence: 99%

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Rain, dew, and humid air as drivers of morphology, function and spatial distribution in epiphytic lichens

2014

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This review is a first attempt to combine and compare spatial distribution of the three main water sources, rain, dew and humid air, with water-related traits of mainly epiphytic macrolichens in a conceptual and functional model. By comparing climatic and lichenological knowledge, various effects of dewfall, rainfall and humid air on epiphytic lichen morphology and function are analyzed to search for traits and patterns. Although dew, rain and humid air cause lichen hydration and activate photosynthesis, these atmospheric hydration sources influence and shape lichens differently. In order to visualize hydration patterns, dew, rain and humid air are shown as corners in a triangle exhibiting the various combinations of these hydration sources. The sources of hydration vary on temporal scales, and on the spatial scales: regional, landscape, stand and tree. Lichen growth form, photobiont type, water-holding capacity (WHC) and suprasaturation depression show clear patterns within the hydration triangle. For most lichen species, one average pre-dawn dewfall approximately fills their average internal WHC. This suggests that lichens are optimally designed to utilize dew rather than rain, consistent with literature emphasizing dew as a driver for annual C-assimilation in chlorolichens. However, rain is needed to fill their external WHC and to fully hydrate most cyanolichens. Including the sources of hydration and internal lichen variables, such as water-holding capacity, will improve modelling of local and global future scenarios on lichen distribution and biomass production.

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“…Basic ideas and hypotheses regarding the hydration source model (Fig. 2) (Xiao et al 2013), increasing nocturnal cooling and thus increasing air humidity (e.g. Geiger 1950).…”

Section: Regional Scalesmentioning

confidence: 99%

Section: Regional Scalesmentioning

confidence: 99%

Rain, dew, and humid air as drivers of morphology, function and spatial distribution in epiphytic lichens

2014

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“…Dew can originate from three separate sources: air (dewfall), plant (guttation), and soil (dewrise) [3]. Sufficient moisture in the air and intensive radiative cooling of the surface are two basic requirements for the formation of dew [4]. Relative humidity directly affects atmospheric visibility and the formation of clouds, fog, and dew [3,5,6].…”

Section: Introductionmentioning

confidence: 99%

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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“…2b), which makes it more 271 difficult for the air temperature to approach the dew point temperature (Beysens, 272 1995;Jacobs et al, 2006;Mortuza et al, 2014). Warming can also accelerate the dew 273 evaporation process (Xiao et al, 2013). Dew droplets lasted for a shorter period of 274 time under warmer temperatures, which also led to a lower dew duration or amount 275 (Xu et al, 2015).…”

Section: Effects Of Warming On Dew Amount Among Different Functional mentioning

confidence: 99%

“…3). Because under ambient conditions, the upper canopy air 298 temperature is lower at night due to this area receiving less land-surface radiation, 299 dew formation occurs earlier in higher leaves, such as those of grasses (Zhang et al, stored within a dense canopy can be preserved for a longer period of time through the 305 reduction in evaporation (Xiao et al, 2013). 306…”

Section: Effects Of Warming On Dew Amount Among Different Functional mentioning

confidence: 99%

Infrared heater warming system markedly reduces dew formation: An overlooked factor in arid ecosystems

Feng

Zhang

Chen

et al. 2020

Preprint

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23Dew plays a vital role in ecosystem processes in arid and semi-arid regions 24 and is expected to be affected by climate warming. Infrared heater warming 25 systems have been widely used to simulate climate warming effects on 26 ecosystem. However, how this warming system affects dew formation has been 27 long ignored and rarely addressed. In a typical alpine grassland ecosystem on the 28Northeast of the Tibetan Plateau, we measured dew amount and duration by 29 artificial condensing surfaces, leaf wetness sensors and in situ dew formation on 30 plants from 2012 to 2017. We also measured plant traits related to dew 31 conditions. The results showed that (1) warming reduced the dew amount by 32 41.6%-91.1% depending on the measurement method, and reduced dew duration 33 by 32.1 days compared to the ambient condition. (2) Different plant functional 34 groups differed in dew formation. (3) Under the infrared warming treatment, the 35 dew amount decreased with plant height, while under the ambient conditions, the 36 dew amount showed the opposite trend. We concluded that warming with an 37 infrared heater system greatly reduces dew formation, and if ignored, it may lead 38 to overestimation of the effects of climate warming on ecosystem processes in 39 climate change simulation studies. 40 41

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Analysis of the effect of meteorological factors on dewfall

Cited by 22 publications

References 19 publications

Rain, dew, and humid air as drivers of morphology, function and spatial distribution in epiphytic lichens

Rain, dew, and humid air as drivers of morphology, function and spatial distribution in epiphytic lichens

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

Infrared heater warming system markedly reduces dew formation: An overlooked factor in arid ecosystems

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