Shorelines in the Sahara: geomorphological evidence for an enhanced monsoon from palaeolake Megachad

@article{Drake2006ShorelinesIT,
  title={Shorelines in the Sahara: geomorphological evidence for an enhanced monsoon from palaeolake Megachad},
  author={Nicholas Drake and Charlie S. Bristow},
  journal={The Holocene},
  year={2006},
  volume={16},
  pages={901 - 911}
}
The Sahara Desert is the most extensive desert on Earth but during the Holocene it was home to some of the largest freshwater lakes on Earth; of these, palaeolake Megachad was the biggest. Landsat TM images and Shuttle Radar Topography Mission (SRTM) digital topographic data reveal numerous shorelines around palaeolake Megachad. At its peak sometime before 7000 years ago the lake was over 173 m deep with an area of at least 400 000 km2, bigger than the Caspian Sea, the biggest lake on Earth… Expand
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References

SHOWING 1-10 OF 25 REFERENCES
Holocene Lake Mega-Chad palaeoshorelines from space
During the Holocene a giant lake, known as Lake Mega-Chad (LMC), extended over more than 350,000 km2 in southern Sahara. Morphodynamic features of sedimentary systems outlining the LMC… Expand
The Holocene giant Lake Chad revealed by digital elevation models
Abstract The Chad Basin is a closed basin in the Central part of North Africa. A southern sub-basin, which is supplied by the humid tropics, includes the present-day Lake Chad. The northern sub-basin… Expand
The Geological and Paleogeomorphological Evolution of a Spit System and Its Associated Coastal Environments: Cape Henlopen Spit, Delaware
ABSTRACT Cape Healopen is a simple spit located at the confluence of the large estuary, Delaware Bay, and the Atlantic Ocean on the northeast coast of the United States of America. Examination of… Expand
Hydrological changes in the African tropics since the Last Glacial Maximum
Abstract Paleohydrological data from the African tropics and subtropics, including lake, groundwater and speleothem records, are reviewed to show how environments and climates from both hemispheres… Expand
Simulation of an abrupt change in Saharan vegetation in the mid-Holocene
Climate variability during the present inter- glacial, the Holocene, has been rather smooth in compar- ison with the last glacial. Nevertheless, there were some rather abrupt climate changes. One of… Expand
Multiple phases of North African humidity recorded in lacustrine sediments from the Fazzan Basin, Libyan Sahara
Abstract The Fazzan Basin of south-west Libya is at present arid with less than 20 mm of rainfall per annum. However, regionally extensive limestones, lacustrine sands and coquina (fossiliferous… Expand
New research on the Holocene settlement and environment of the Chad Basin in Nigeria
Recent investigations of three archaeological sites in the Nigerian part of the Chad Basin during the Holocene reveal key stages in the cultural development and environmental history of that region.… Expand
Paleowind (11,000 BP) directions derived from lake spits in Northern Michigan
We report on the characteristics of several, previously unstudied, late Pleistocene spits in northern lower Michigan. Each spit developed as strong waves eroded a headland or island within the Main… Expand
The appearance of Cardium fauna and foraminifers in the great lakes of the early quaternary period in the Algerian central Sahara desert
Remains of large ancient lakes (30 to 35 m of deposits) can be found downstream from two endoreic basins in the Algerian Sahara. Hydrographic networks drain water from the Atlas mountains (north-west… Expand
Feedbacks between climate and surface water in northern Africa during the middle Holocene
Observations indicate that the area of lakes and wetlands in northern Africa was considerably greater during the middle Holocene than at present. Simulations are designed to examine whether expanded… Expand
...
1
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