Arid
DOI10.1016/S0169-555X(03)00076-X
Geomorphic indicators of holocene winds in Egypt’s Western Desert
Brookes, IA
通讯作者Brookes, IA
来源期刊GEOMORPHOLOGY
ISSN0169-555X
出版年2003
卷号56期号:1-2页码:155-166
英文摘要

Geomorphic mapping of Egypt’s Western Desert from LANDSAT-MSS images reveals oriented aeolian landforms that record, in part, Holocene winds. Wind directions reconstructed from these landforms indicate the dominance of N-S airflow from 30degreesN to 20degreesN, turning clockwise southward to NE-SW, conformable with modern circulation. A second direction appears over western Egypt, W between 30degreesN and 26degreesN, NW between 26degreesN and 20degreesN. Cross-cutting aeolian landforms show that W/ NW winds are older than the N/NE winds. Geomorphic evidence, abundant south to 26degreesN and less abundant to 20degreesN, also indicates that W and NW winds were early Holocene `palaeowesterlies’. Some evidence also indicates that they extended eastward to at least 30degreesE, perhaps to the Red Sea. These winds steered moist Atlantic/Mediterranean air masses to Egypt, sustaining early Holocene lakes and playas north of the limit of tropical monsoonal rainfall at 20degreesN. Upon aridification, beginning after 5 kyr BP, yardangs oriented west to east were eroded in early Holocene basinal sediments in western Egypt, indicating that these winds continued there for 1-2 kyr, until 3-4 kyr BP. Optically stimulated luminescence (OSL) ages of surface sand sheet in southern Egypt indicate that the present north-south winds were established ca. 3-4 kyr BP, at the same time as the northern savanna boundary was stabilized at its present position. (C) 2003 Elsevier Science B.V. All rights reserved.


英文关键词Egypt Sahara holocene aeolian geomorphology palaeoclimate palaeowinds
类型Article
语种英语
国家Canada
收录类别SCI-E
WOS记录号WOS:000187968100010
WOS关键词LAST GLACIAL MAXIMUM ; EASTERN SAHARA ; LANDSCAPE EVOLUTION ; MODEL SIMULATIONS ; MIDDLE HOLOCENE ; AFRICAN MONSOON ; NORTHERN AFRICA ; HUMID PERIOD ; OASIS ; MIDHOLOCENE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/144685
作者单位(1)Univ York, Dept Geog, Toronto, ON M3J 1P3, Canada
推荐引用方式
GB/T 7714
Brookes, IA. Geomorphic indicators of holocene winds in Egypt’s Western Desert[J],2003,56(1-2):155-166.
APA Brookes, IA.(2003).Geomorphic indicators of holocene winds in Egypt’s Western Desert.GEOMORPHOLOGY,56(1-2),155-166.
MLA Brookes, IA."Geomorphic indicators of holocene winds in Egypt’s Western Desert".GEOMORPHOLOGY 56.1-2(2003):155-166.
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