干旱区生态环境知识资源中心(Arid): Are the phosphate oxygen isotopes of Saharan dust a robust tracer of atmospheric P source?

Arid

DOI	10.1016/j.atmosenv.2020.117561
	Are the phosphate oxygen isotopes of Saharan dust a robust tracer of atmospheric P source?
	Bigio, Laura; Mayol-Bracero, Olga L.; Santos, Gilmarie; Fishman, Asi; Angert, Alon
通讯作者	Bigio, L
来源期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
EISSN	1873-2844
出版年	2020
卷号	235
英文摘要	( )Aeolian dust is a significant source of phosphorus (P) in various ecosystems. The Saharan desert is the major dust source on earth and it contributes atmospheric P to terrestrial ecosystems which often depend on these inputs. Since estimations on the contribution of dust to the atmospheric P cycle vary between studies, accurate estimations on the aerosol-P inputs to ecosystems can be enhanced by an identification method for dust from the other atmospheric P sources. In the current study, we explored the use of the oxygen stable isotopes in phosphate, delta(18)Op, as a marker for desert dust P. To characterize the delta(18)Op in Saharan dust, we analyzed atmospheric particles sampled in Puerto Rico, which has good exposure in summer to African dust with little exposure to wildfires, local, or anthropogenic influence on atmospheric inputs. Additionally, to evaluate possible isotopic fractionations in desert dust sources, which could affect the soil delta(18)Op before transport, we analyzed the delta(18)Op in Israeli desert soils that served as an analog. Saharan dust storms sampled at Puerto Rico were found to have delta(18)Op values of 22.5 + 0.3 parts per thousand in the resin fraction (which represents labile inorganic P), similar to previously reported values of Saharan dust sampled in Israel. The data from Israel desert soils demonstrated that biological activity in desert crusts can have a small effect (with a maximum difference of 3.3 parts per thousand. between the topsoil and the subsoil) on the delta(18)Op of desert soils, mainly when developed soil crust is present, as a result of intracellular isotopic equilibration between oxygen in phosphate and soil water. However, biological crusts are not considered a major dust source. Additionally, Saharan dust sampled in Israel and in Puerto Rico had a delta(18)Op similar to apatite minerals derived from sedimentary phosphorites. Thus, we suggest the dust source had little or no biological activity. Furthermore, the delta(18)Op in Saharan dust was distinctive from other atmospheric P sources, such as pollen and wildfire ash, and as a result, the delta(18)Op can be used to distinguish between these atmospheric P main sources.
英文关键词	Dust Sahara Phosphate Phosphorus Isotopic signature delta 180P isotopes Aerosols
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000542175900002
WOS关键词	BIOLOGICAL SOIL CRUSTS ; BIOAVAILABLE PHOSPHORUS ; INORGANIC-PHOSPHATE ; BIOGENIC APATITES ; AFRICAN DUST ; DEPOSITION ; TRANSPORT ; GEOCHEMISTRY ; VARIABILITY ; EMISSIONS
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构	Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324811
作者单位	[Bigio, Laura; Fishman, Asi; Angert, Alon] Hebrew Univ Jerusalem, Inst Earth Sci, Edmond J Safra Campus, IL-91904 Jerusalem, Israel; [Mayol-Bracero, Olga L.; Santos, Gilmarie] Univ Puerto Rico, Inst Trop Ecosyst Studies, Rio Piedras, PR USA
推荐引用方式 GB/T 7714	Bigio, Laura,Mayol-Bracero, Olga L.,Santos, Gilmarie,et al. Are the phosphate oxygen isotopes of Saharan dust a robust tracer of atmospheric P source?[J]. Hebrew University of Jerusalem,2020,235.
APA	Bigio, Laura,Mayol-Bracero, Olga L.,Santos, Gilmarie,Fishman, Asi,&Angert, Alon.(2020).Are the phosphate oxygen isotopes of Saharan dust a robust tracer of atmospheric P source?.ATMOSPHERIC ENVIRONMENT,235.
MLA	Bigio, Laura,et al."Are the phosphate oxygen isotopes of Saharan dust a robust tracer of atmospheric P source?".ATMOSPHERIC ENVIRONMENT 235(2020).