干旱区生态环境知识资源中心(Arid): Droughts in the desert: Medieval Warm Period associated with coarse sediment layers in the Gulf of Aqaba-Eilat, Red Sea

Arid

DOI	10.1111/sed.12737
	Droughts in the desert: Medieval Warm Period associated with coarse sediment layers in the Gulf of Aqaba-Eilat, Red Sea
	Kalman, Akos 1,2; Katz, Timor 3; Hill, Paul 3; Goodman-Tchernov, Beverly 1
通讯作者	Kalman, Akos
来源期刊	SEDIMENTOLOGY
ISSN	0037-0746
EISSN	1365-3091
出版年	2020
卷号	67 期号:6 页码:3152-3166
英文摘要	Prolonged droughts can cause environmental stress, even in ecosystems that are already adapted to dry conditions. In these areas life greatly depends on rare, sporadic rainfall events that can produce flash floods. Today, urban expansion, population growth and development are occurring worldwide, including along hyperarid coastlines, an ecological zone on the extreme of habitability. In such places, the absence of the already limited precipitation can lead to long-lasting damage, and recognizing drought conditions in the past is useful for planning. Recognizing droughts, however, is challenging because they are not known as depositional events, and therefore may be under-recognized in the sedimentological record. Floods in these hyperarid deserts carry eroded sediments and deposit them in either terrestrial or marine terminal basins. In the hyperarid (ca 30 mm rain per year) desert surrounding the northern Gulf of Aqaba-Eilat some flash floods reach the sea and deposit alluvial sediments (mostly silt and clay) on the shelf. Following a recent 17 year drought period (1995 to 2012) a coarser surface layer was recognized offshore the outlet of an ephemeral river, despite the lack of incoming flood material. This coarsened layer resulted from a prolonged period wherein mixing and winnowing of fine particles at the surface was not interrupted by recurrent flash floods. In the bottom of two sediment cores collected from the same shelf, a similarly coarsened layer was observed. The terminal level of this deep coarse layer was dated to ca 660 yr bp, corresponding with the end of the Medieval Warm Period (ca 1350 ad). These findings suggest that the medieval anomaly resulted in a prolonged drought period in this already arid region. These results present a new interpretation of grain-size distribution records that provides a means to reconstruct drought histories in hyperarid regions globally.
英文关键词	Droughts flash floods Medieval Warm Period Red Sea sedimentology winnowing
类型	Article
语种	英语
国家	Israel ; Canada
收录类别	SCI-E
WOS记录号	WOS:000532693000001
WOS关键词	NEGEV DESERT ; CLIMATE-CHANGE ; HOLOCENE ; FLOODS ; SHELF ; REGION ; DESERTIFICATION ; PRECIPITATION ; BIOTURBATION ; PRESERVATION
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318648
作者单位	1.Univ Haifa, Dept Marine Geosci, Leon Charney Sch Marine Sci, IL-31905 Haifa, Israel; 2.Israel Oceanog & Limnol Res, POB 8030, IL-31080 Haifa, Israel; 3.Dalhousie Univ, Dept Oceanog, 1355 Oxford St,POB 15000, Halifax, NS B3H 4R2, Canada
推荐引用方式 GB/T 7714	Kalman, Akos,Katz, Timor,Hill, Paul,et al. Droughts in the desert: Medieval Warm Period associated with coarse sediment layers in the Gulf of Aqaba-Eilat, Red Sea[J],2020,67(6):3152-3166.
APA	Kalman, Akos,Katz, Timor,Hill, Paul,&Goodman-Tchernov, Beverly.(2020).Droughts in the desert: Medieval Warm Period associated with coarse sediment layers in the Gulf of Aqaba-Eilat, Red Sea.SEDIMENTOLOGY,67(6),3152-3166.
MLA	Kalman, Akos,et al."Droughts in the desert: Medieval Warm Period associated with coarse sediment layers in the Gulf of Aqaba-Eilat, Red Sea".SEDIMENTOLOGY 67.6(2020):3152-3166.