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

Meng, Yao; Wen, Xuefa

doi:10.1007/s40333-016-0006-y

Cited by 21 publications

(5 citation statements)

References 38 publications

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“…Fog and dew could occur at the same night in the study area occasionally. However, the probability of dew occurrences during the observed fog events was very low because of the higher air temperature than dew point temperature calculated following Lawrence (2005) (Table S2 in Supporting Information ) and the higher wind speed than the suitable wind velocity (1–1.8 m/s) for the dew formation in the desert ecosystems (Meng & Wen, 2016; Zhuang et al., 2021). Therefore, the dew‐related misinterpretation in backscatter signals is negligible in this study.…”

Section: Discussionmentioning

confidence: 99%

Fog Detection and Estimation Using CALIPSO Lidar Observations

Qiao

Wang

Marais

et al. 2022

Geophysical Research Letters

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It has been reported that fog showed positive impacts on vegetation from various ecosystems in many parts of the world such as the Namib Desert (Eckardt et al., 2013;Mitchell et al., 2020), the coastal California redwood forest (Burgess & Dawson, 2004), and the Atacama Desert (Aravena et al., 1989). Fog can maintain vegetation photosynthetic function and sustain biogeochemical dynamics during rainless periods (Scholl et al., 2011;Wang et al., 2017). Previous studies have demonstrated the mechanisms of plant fog water uptake in drylands either through foliar water uptake or through shallow roots (

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Section: Discussionmentioning

confidence: 99%

Fog Detection and Estimation Using CALIPSO Lidar Observations

Qiao

Wang

Marais

et al. 2022

Geophysical Research Letters

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“…Both the downward path through the condensation of ambient vapour and the upward path through the distilled water vapour from the soil to the leaves are all the path of dew input (Li et al, 2021). Some researchers investigated dew characteristics (Meng & Wen, 2016) and response to environmental factors such as wind speed, air or surface temperature, and relative humidity (Aguirre‐Gutiérrez et al, 2019; Fang, 2020; Zhuang & Zhao, 2014). However, less studies consider the impacts of total radiation (Aguirre‐Gutiérrez et al, 2019) and evapotranspiration (Tian et al, 2021) on dew formation.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations and sources of the dew from stable isotopes in alpine meadows

Li,

Zhang,

et al. 2023

Hydrological Processes

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The dew is closely related to the micro‐use water of plants and the large‐scale hydrological processes, its formation on grassland plays a vital role especially in maintaining the eco‐hydrological cycle. We used structural equation modelling to investigate how environmental factors would affect dew formation on alpine graminoid‐Kobresia meadow in northern Qinghai‐Tibet Plateau. The stable isotope information of dew, ambient vapour, soil water, plant water, creek water and precipitation were tracked to explore the source of dew, the dew transport route of the six dominant species by Mix SIAR model. Our results showed that the frequency of dew on the graminoid‐Kobresia meadow in 2020 and 2021 was 42.86% and 45.83%, respectively. Both atmospheric pressure (r = 0.4) and temperature (r = 0.382) showed significant positive effects dew formation while wind speed (r = −0.309) had a negative effect. The contribution rates of soil water, plant water and ambient water vapour to dew were 48.20 ± 5.46%, 38.30 ± 5.07%, and 13.50 ± 1.82%, respectively. The proportion of dew utilization in the dominant species had no significant species differences. Our results provided an improved understanding of dew formation based on isotope technology on alpine meadow in northern Qinghai‐Tibet Plateau.

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“…NRW inputs contribute to the water budget across many ecosystems including croplands (Atzema et al, 1990;Wen et al, 2012;He and Richards, 2015;Meng and Wen, 2016;Tomaszkiewicz et al, 2017), grasslands (Jacobs et al, 2006;Wen et al, 2012;He and Richards, 2015), and forests (Fritschen and Doraiswamy, 1973;Dawson, 1998;Lai and Ehleringer, 2011;Hiatt et al, 2012;Berkelhammer et al, 2013). As compared to forests, grasslands present favorable conditions for dew and radiation fog formation: (1) a cooler surface due to a higher albedo and thus lower net solar radiation input (Moore, 1976), as well as higher evapotranspiration (Kelliher et al, 1993;Williams et al, 2012);…”

Section: Introductionmentioning

confidence: 99%

The role of dew and radiation fog inputs in the local water cycling of a temperate grassland during dry spells in central Europe

Li¹,

Aemisegger

Riedl³

et al. 2022

Preprint

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During dry spells, non-rainfall water (hereafter NRW) mostly formed from dew and fog potentially plays an increasingly important role in temperate grassland ecosystems with ongoing global warming. Dew and radiation fog occur in combination during clear and calm nights, and both use ambient water vapor as a source. Research on the combined mechanisms involved in NRW inputs to ecosystems is rare, and distillation of water vapor from the soil as a NRW input pathway for dew formation has hardly been studied. Furthermore, eddy covariance (EC) measurements are associated with large uncertainties on clear, calm nights when dew and radiation fog occur. The aim of this paper is thus to use stable isotopes as tracers to investigate the different NRW input pathways into a temperate Swiss grassland at Chamau during dry spells in summer 2018. Stable isotopes provide additional information on the pathways from water vapor to liquid water (dew and fog) that cannot be measured otherwise. We measured the isotopic composition (&#948;18O, &#948;2H, and d = &#948;2H &#8722; 8&#8901;&#948;18O) of ambient water vapor, NRW droplets on leaf surfaces, and soil moisture and combined them with EC and meteorological observations during one dew-only and two combined dew and radiation fog events. The ambient water vapor d was found to be strongly linked with local surface relative humidity (r = &#8722;0.94), highlighting the dominant role of local moisture as a source for ambient water vapor in the synoptic context of the studied dry spells. Detailed observations of the temporal evolution of the ambient water vapor and foliage NRW isotopic signals suggest two different NRW input pathways: (1) the downward pathway through the condensation of ambient water vapor and (2) the upward pathway through the distillation of water vapor from soil onto foliage. We employed a simple two-end-member mixing model using &#948;18O and &#948;2H to quantify the NRW inputs from these two different sources. With this approach, we found that distillation contributed 9&#8211;42% to the total foliage NRW, which compares well with estimates derived from a near-surface vertical temperature gradient method proposed by Monteith in 1957. The dew and radiation fog potentially produced 0.17&#8211;0.54&#8201;mm&#8201;d-1 NRW gain on foliage, thereby constituting a non-negligible water flux to the canopy, as compared to the evapotranspiration of 2.7&#8201;mm&#8201;d-1. Our results thus underline the importance of NRW inputs to temperate grasslands during dry spells and reveal the complexity of the local water cycle in such conditions, including different pathways of dew and radiation fog water inputs.

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

Cited by 21 publications

References 38 publications

Fog Detection and Estimation Using CALIPSO Lidar Observations

Fog Detection and Estimation Using CALIPSO Lidar Observations

Seasonal variations and sources of the dew from stable isotopes in alpine meadows

The role of dew and radiation fog inputs in the local water cycling of a temperate grassland during dry spells in central Europe

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