干旱区生态环境知识资源中心(Arid): Unique stable isotope signatures of large cyclonic events as a tracer of soil moisture dynamics in the semiarid subtropics

Arid

DOI	10.1016/j.jhydrol.2019.124124
	Unique stable isotope signatures of large cyclonic events as a tracer of soil moisture dynamics in the semiarid subtropics
	Skrzypek, Grzegorz 1,2; Dogramaci, Shawan 1,2,3; Page, Gerald F. M.1,2,4; Rouillard, Alexandra 1,2,5; Grierson, Pauline F.1,2
通讯作者	Skrzypek, Grzegorz
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2019
卷号	578
英文摘要	Evaporative flux from soils in arid and semi-arid climates can be very high and may substantially reduce soil moisture retained between infrequent rainfall events. Direct measurement of the evaporative losses from soils is technically challenging. However, environmental tracers such as water stable hydrogen and oxygen isotope composition can be used to calculate evaporation rates if the initial signature of the infiltrating rainwater is distinct from the signature of residual soil moisture. Jorge tropical cyclones typically result in rainfall events of large volume and very negative delta O-18 signatures that are significantly lower than the signatures of more frequent and smaller rainfall events. These very negative stable isotope signatures are retained in the soil and can be used to understand the depth of water infiltration, retention and subsequent rate of evaporation from the soil. At our study site in dry subtropical northwest Australia, we repeatedly sampled rainwater and soil moisture prior to, during and after tropical Cyclones Heidi and Lua in 2012. Site inundation from Cyclone Heidi (rainfall 213 mm, delta O-18-17.6460) replenished soil moisture in the unsaturated zone for several months, completely replacing soil moisture down to depths of similar to 3.5 m and contributing to groundwater recharge. The transient momentary evaporative losses from wet soil at the time of sampling varied between 0.21 and 0.60 mm x day(-1) (equivalent to 76 to 220 mm x yr(-1) recalculated as an annual rate). During the prolonged dry period between cyclones, evaporative losses decreased to between 8 and 30 mm x yr(-1). Mean long-term groundwater recharge for the study site was low (< 6 mm x yr(-1)). Recharge is primarily driven by infrequent but high-volume cyclones that are an important source of soil moisture and an essential water source for vegetation in this semi-arid environment. However, variation in lithology, position in the landscape and time since the last inundation contribute to highly heterogeneous patterns of delta O-18 in the vadose zone, which complicates upscaling observations from a local to a regional scale model of evaporative demand.
英文关键词	Soil Stable isotope Moisture Semiarid Evaporation Cyclone
类型	Article
语种	英语
国家	Australia ; USA ; Norway
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000497250200102
WOS关键词	GROUND-WATER RECHARGE ; TROPICAL CYCLONES ; MESOPOROUS SILICA ; HAMERSLEY BASIN ; PORE-WATER ; RAINFALL ; EVAPORATION ; FRACTIONATION ; VARIABILITY ; VEGETATION
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
EI主题词	2019-11-01
来源机构	University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310719
作者单位	1.Univ Western Australia, Ecosyst Res Grp, Sch Biol Sci, Perth, WA 6009, Australia; 2.Univ Western Australia, West Australian Biogeochem Ctr, Sch Biol Sci, Perth, WA 6009, Australia; 3.Rio Tinto Iron Ore, Perth, WA 6000, Australia; 4.Oregon State Univ, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA; 5.UiT Arctic Univ Norway, Dept Geosci, N-9037 Tromso, Norway
推荐引用方式 GB/T 7714	Skrzypek, Grzegorz,Dogramaci, Shawan,Page, Gerald F. M.,et al. Unique stable isotope signatures of large cyclonic events as a tracer of soil moisture dynamics in the semiarid subtropics[J]. University of Western Australia,2019,578.
APA	Skrzypek, Grzegorz,Dogramaci, Shawan,Page, Gerald F. M.,Rouillard, Alexandra,&Grierson, Pauline F..(2019).Unique stable isotope signatures of large cyclonic events as a tracer of soil moisture dynamics in the semiarid subtropics.JOURNAL OF HYDROLOGY,578.
MLA	Skrzypek, Grzegorz,et al."Unique stable isotope signatures of large cyclonic events as a tracer of soil moisture dynamics in the semiarid subtropics".JOURNAL OF HYDROLOGY 578(2019).