Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0169-555X |
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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