干旱区生态环境知识资源中心(Arid): Stable isotopic composition of fog and rainfall in a Macaronesian cloud forest

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DOI	10.1016/j.jhydrol.2023.129763
	Stable isotopic composition of fog and rainfall in a Macaronesian cloud forest
	Guerra, Juan C.; Regalado, Carlos M.; Ritter, Axel; Leon-Gonzalez, Maria
通讯作者	Guerra, JC
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	622
英文摘要	Stable isotopes of water are commonly used to investigate the role of fog in cloud forests. This first requires the characterization of the isotopic signatures of both fog and local rainfall. The isotopic composition of rain and fog water and their variability were analysed for a Macaronesian cloud forest in Tenerife, Canary Islands, from samples collected over 5 years within the Global Network of Isotopes in Precipitation (GNIP) project. The results showed little differences in the isotopic signature of fog and rain with the former being slightly higher with respect to the latter (differences in absolute value of 1%o in & delta;18O, 7%o in & delta;2H and 0.7%o in d-excess, on average) and with a similar statistical variability. Their meteoric lines, LMWL (local meteoric water line for precipitation): & delta;2H = 6.56 & delta;18O + 11.56 and FWL (fog water line): & delta;2H = 5.57 & delta;18O + 9.98, which are very close to each other and above the GMWL (Global Meteoric Water Line), reveals that rain and fog may originate from water evaporated from the same water sources and under moisture conditions typical of semi-arid regions. Different slopes and interception in LMWL and FWL point to seasonal processes affect fog and rain differently, i.e. summer evaporation of small fog droplets and autumn-winter rainfalls isotopically depleted from frontal or low-pressure systems that are decoupled from fog formation processes. Both isotopic signatures showed low correlation with temperature and total rainfall (R2 <0.3 in all cases). However, the high anticorrelation observed (R2 values >0.6) between the isotopic composition of rain and fog with rainfall totals with values between 100 and 150 mm for both fog and rain, associated with a well-defined synoptic rainfall pattern affecting the Canary Islands, supports the hypothesis that the amount effect is related to the moisture source region and transport patterns. Annual variability of the isotopic signatures showed a marked pattern, typical of these latitudes, with enriched values in summer and more depleted in winter for both rainfall and fog. The high amplitude observed in the seasonal pattern of d-excess for both rain and fog, point to the Mediterranean Sea as a potential source of moisture in the winter months or to a mixing process when the moist air mass trajectories pass over North Africa. Despite the similarities observed in these seasonal patterns, some anomalies were found in the summer d-excess, indicating the participation of some local processes to which d-excess is sensitive, such as sub-cloud evaporation or moisture recycling.
英文关键词	Anaga Biosphere Reserve Canary Islands Ecohydrology Fog water Rainfall Stable isotopes
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001013549500001
WOS关键词	POINT-REYES PENINSULA ; METEORIC WATER LINE ; GROUNDWATER RECHARGE ; DEUTERIUM EXCESS ; CANARY-ISLANDS ; REGIONAL HYDROLOGY ; WEATHER PATTERNS ; VOLCANIC ISLAND ; MOISTURE SOURCE ; WINTER-WHEAT
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397405
推荐引用方式 GB/T 7714	Guerra, Juan C.,Regalado, Carlos M.,Ritter, Axel,et al. Stable isotopic composition of fog and rainfall in a Macaronesian cloud forest[J],2023,622.
APA	Guerra, Juan C.,Regalado, Carlos M.,Ritter, Axel,&Leon-Gonzalez, Maria.(2023).Stable isotopic composition of fog and rainfall in a Macaronesian cloud forest.JOURNAL OF HYDROLOGY,622.
MLA	Guerra, Juan C.,et al."Stable isotopic composition of fog and rainfall in a Macaronesian cloud forest".JOURNAL OF HYDROLOGY 622(2023).