干旱区生态环境知识资源中心(Arid): Dew Yield and Its Influencing Factors at the Western Edge of Gurbantunggut Desert, China

Arid

DOI	10.3390/w11040733
	Dew Yield and Its Influencing Factors at the Western Edge of Gurbantunggut Desert, China
	Jia, Zhifeng 1,2,3; Zhao, Zhiqiang 2; Zhang, Qianyi 2; Wu, Weichen 2
通讯作者	Jia, Zhifeng
来源期刊	WATER
ISSN	2073-4441
出版年	2019
卷号	11 期号:4
英文摘要	Dew is a significant water resource in arid desert areas. However, information regarding dew is scarce because it is difficult to measure due to the harsh environment of locations such as Gurbantunggut Desert, China. In this study, a non-destructive field experiment was conducted from 2015 to 2018 at a desert test station located in the western edge of the Gurbantunggut Desert, using a calibrated leaf wetness sensor (LWS) to measure dew yield. The results are as follows: (1) Dew formed after sunset with the atmospheric temperature gradually dropping and evaporated after sunrise with the temperature increasing in the second morning. (2) Dew was featured as high frequency and low yield'. The average daily dew yield during dew days was 0.10 mm with a daily maximum of 0.62 mm, while dew days accounted for 44% of the total monitoring days, with a monthly maximum of 25 days. Compared with rainfall, dew days were two times as frequent as rainy days, while the average annual dewfall (12.21 mm) was about 1/11th of the average annual rainfall (134.6 mm), which indicates the dew contribution to regional water balance is about 9%. (3) March-April and October-November are the main periods of dew occurrence in this region because accumulated snow begins to melt slowly in March-April, providing sufficient vapor for dew formation, and the air temperature difference between day and night in October-November is the highest in the year, meaning that the temperature drops rapidly at night, making it easier to reach the dewpoint for vapor condensation. (4) Daily dew yield (D) was positively correlated to relative humidity (RH) and the difference between soil temperature at 10 cm below the ground and surface soil temperature (T-ss), and negatively correlated to wind speed (V), air temperature (T-a), surface soil temperature (T-s), cloud cover (N), dewpoint temperature (T-d) and the difference between air temperature and dewpoint temperature (T-ad). It should be noted that the measured values of all factors above were the average value of the overnight period. The multivariate regression equation, D = -0.705 + 0.011 x RH - 0.006 x N - 0.01 x V, can estimate the daily dew yield with the thresholds of the parameters, i.e., RH > 70%, N < 7 (oktas) and V < 6 m/s.
英文关键词	dew formation dew yield factors desert ecosystem
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000473105700103
WOS关键词	NEGEV DESERT ; RELATIVE-HUMIDITY ; EPHEMERAL PLANTS ; SEMIARID REGION ; GRASSLAND AREA ; SEED DORMANCY ; WATER-BUDGET ; ECOSYSTEM ; VAPOR ; COLLECTION
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219198
作者单位	1.Changan Univ, Inst Water & Dev, Xian 710054, Shaanxi, Peoples R China; 2.Changan Univ, Sch Environm Sci & Engn, Xian 710054, Shaanxi, Peoples R China; 3.Changan Univ, Minist Educ, Key Lab Subsurface Hydrol & Ecol Effects Arid Reg, Xian 710054, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Jia, Zhifeng,Zhao, Zhiqiang,Zhang, Qianyi,et al. Dew Yield and Its Influencing Factors at the Western Edge of Gurbantunggut Desert, China[J],2019,11(4).
APA	Jia, Zhifeng,Zhao, Zhiqiang,Zhang, Qianyi,&Wu, Weichen.(2019).Dew Yield and Its Influencing Factors at the Western Edge of Gurbantunggut Desert, China.WATER,11(4).
MLA	Jia, Zhifeng,et al."Dew Yield and Its Influencing Factors at the Western Edge of Gurbantunggut Desert, China".WATER 11.4(2019).