干旱区生态环境知识资源中心(Arid): The overlooked non-rainfall water input sibling of fog and dew: Daily water vapor adsorption on a !Nara hummock in the Namib Sand Sea

Arid

DOI	10.1016/j.jhydrol.2021.126420
	The overlooked non-rainfall water input sibling of fog and dew: Daily water vapor adsorption on a !Nara hummock in the Namib Sand Sea
	Kool, D.; Agra, E.; Drabkin, A.; Duncan, A.; Fendinat, P. P.; Leduc, S.; Lupovitch, G.; Nambwandja, A. N.; Ndilenga, N. S.; Thi, T. Nguyen; Poodiack, B.; Sagi, L.; Shmuel, Y.; Maggs-Kolling, G.; Marais, E.; Pinshow, B.; Turner, J. S.; Agam, N.
通讯作者	Agam, N (corresponding author), Ben Gurion Univ Negev, French Associates Inst Agr & Biotechnol Drylands, Jacob Blaustein Inst Desert Res, Midreshet Ben Gurion, Israel.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	598
英文摘要	The Namib Sand Sea is a hyper-arid coastal fog desert, with limited vegetation scattered across the extensive sand dunes. Minimal and unpredictable rainfall, along with proximity to the ocean, make non-rainfall water inputs (NRWIs), i.e. fog, dew and water vapor adsorption, an important part of the ecohydrology. We studied water accumulation across an elevated hummock formed around a !Nara (Acanthosicyos horridus) thicket in the Namib dunes during February 2020. Continuous measurements of temperature and relative humidity (RH) gradients between the soil and the air were complemented with three nights of intensive NRWI observations using 14 micro-lysimeters. While the overall objective was to study total NRWI accumulation, micro-lysimeter placement was designed to address additional questions about how NRWI accumulation was affected by hummock microtopography and the position of the !Nara thicket. Water vapor adsorption was the primary form of NRWI, occurring nightly and accounting for at least half of the total water accumulation, even on nights with fog. This was confirmed by the measured water vapor pressure gradients between the air and the soil, which indicated nightly downward vapor fluxes. Actual vapor pressures in the air were similar on nights with and without fog, indicating fog was mostly determined by temperature. Soil RH was used as a proxy for soil water content and was found to be strongly correlated with air RH. Average nighttime air RH was correlated with total nighttime water accumulation with an R-2 of 0.69-0.78. Average nighttime air RH was correlated with total nighttime water accumulation with a coefficient of determination (R-2) of 0.69-0.78. Even though measurements were limited to the soil, comparison between micro-lysimeters placed on the hummock inside and outside the !Nara thicket indicated consistent, but not significant, lower water contents inside the thicket, suggesting interception of water vapor by the spines and stems of the !Nara. We conclude that water vapor adsorption, though not always appreciated as such, is a large contributor to total NRWI. The fact that water vapor adsorption was the primary NRWI in sand, which has a much lower surface area than most other soil types, and in a place where fog occurs regularly, has implications for deserts worldwide.
英文关键词	NRWI Gobabeb Acanthosicyos horridus Water vapor adsorption Absorption
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000661813200153
WOS关键词	ACANTHOSICYOS-HORRIDUS ; BARE SOIL ; DESERT ; EVAPORATION ; DYNAMICS ; MOISTURE
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350911
作者单位	[Kool, D.; Thi, T. Nguyen; Agam, N.] Ben Gurion Univ Negev, French Associates Inst Agr & Biotechnol Drylands, Jacob Blaustein Inst Desert Res, Midreshet Ben Gurion, Israel; [Agra, E.; Leduc, S.; Lupovitch, G.; Pinshow, B.] Ben Gurion Univ Negev, Swiss Inst Dryland Environm & Energy Res, Jacob Blaustein Inst Desert Res, Mitrani Dept Desert Ecol, Midreshet Ben Gurion, Israel; [Drabkin, A.] Tel Aviv Univ, Dept Zool, Tel Aviv, Israel; [Duncan, A.] Univ Cape Town, Dept Biol Sci, Cape Town, South Africa; [Fendinat, P. P.; Nambwandja, A. N.] Namibia Univ Sci & Technol, Dept Agr & Nat Resources Sci, Windhoek, Namibia; [Nambwandja, A. N.; Ndilenga, N. S.; Maggs-Kolling, G.; Marais, E.] Gobabeb Namib Res Inst, Walvis Bay, Namibia; [Poodiack, B.] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Jacob Blaustein Inst Desert Res, Sede Boqer Campus, Midreshet Ben Gurion, Israel; [Sagi, L.] Ben Gurion Univ Negev, Dept Life Sci, Beer Sheva, Israel; [Shmuel, Y.] Ben Gurion Univ Negev, Dept Life Sci, Eilat Campus, Elat, Is...
推荐引用方式 GB/T 7714	Kool, D.,Agra, E.,Drabkin, A.,et al. The overlooked non-rainfall water input sibling of fog and dew: Daily water vapor adsorption on a !Nara hummock in the Namib Sand Sea[J]. Ben-Gurion University of the Negev,2021,598.
APA	Kool, D..,Agra, E..,Drabkin, A..,Duncan, A..,Fendinat, P. P..,...&Agam, N..(2021).The overlooked non-rainfall water input sibling of fog and dew: Daily water vapor adsorption on a !Nara hummock in the Namib Sand Sea.JOURNAL OF HYDROLOGY,598.
MLA	Kool, D.,et al."The overlooked non-rainfall water input sibling of fog and dew: Daily water vapor adsorption on a !Nara hummock in the Namib Sand Sea".JOURNAL OF HYDROLOGY 598(2021).