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Archive for November 19th, 2009

Dust in the Sahara Desert Near the Tibesti Mountains in Chad

November 19th, 2009 Category: Dust Storms

Sahara Desert - November 16th, 2009

Sahara Desert - November 16th, 2009

The Sahara is the world’s largest hot desert. At over 9,000,000 square kilometres (3,500,000 sq mi), it covers most of Northern Africa, including huge parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. The area visible here includes southern Libya (upper left), northern Chad (lower left), southern Egypt (top right) and northern Sudan (bottom right).

The desert landforms of the Sahara are shaped by wind or by occasional rains, and include sand dunes and dune fields or sand seas, stone plateaus, gravel plains, dry valleys and salt flats. Several deeply dissected mountains and mountain ranges rise from the desert, many of which are volcanic, including the Tibesti Mountains, identifiable here as a brown area along the left edge.

The Tibesti Mountains are a group of dormant volcanoes forming a mountain range in the central Sahara desert in the Bourkou-Ennedi-Tibesti Region of northern Chad. The northern slopes extend a short distance into southern Libya. Here, some whitish colored dust can be seen blowing to the southwest, below the mountain range.

Deforestation Near Lake Abitibi, Canada

48.6N 79.8W

November 19th, 2009 Category: Climate Change, Lakes, Rivers

Canada - November 8th, 2009

Canada - November 8th, 2009

The waters of Lake Abitibi appear tan from sediments in this image of northeastern Ontario, Canada. The 931 km² lake is separated in two distinct portions by a short narrows, making it actually two lakes. The lake is shallow and studded with islands. Its shores and vicinity are covered with small timber.

Its outlet is the Abitibi River, seen here exiting the lake on the left and flowing westward. Portions of Lake Abitibi’s western shores and a section of the Abitibi River are part of the Abitibi-de-Troyes Provincial Park.

By contrast, the eastern shores of the lake and the land farther to the east show signs of deforestation, with tan herringbone patterns cutting through the dark green forest. Pulp and paper is an important industry in this heavily forested region.

The beginning of this deforested area corresponds with the border between the provinces of Ontario (left) and Quebec (right). A white dusting of snow covers some areas in Quebec to the northeast of the lake.

Peary Land: the Mountainous Polar Desert of Northern Greenland

82.6N 31.9W

November 19th, 2009 Category: Snapshots

Greenland - November 10th, 2009

Greenland - November 10th, 2009

Peary Land is a peninsula in northern Greenland, extending into the Arctic Ocean. It is only a bit more than 700 km south of the North Pole. It is bounded by Lincoln Sea (west of Cape Morris Jesup) and Wandel Sea of the Arctic Ocean in the north.

Inland, it reaches from Victoria Fjord in the west to Independence Fjord in the south and southeast, and to the Arctic Ocean in the north, with Cape Morris Jesup, the northernmost point of Greenland’s mainland, and Cape Bridgman in the northeast.

Peary Land is not part of any municipality, but is part of the Northeast Greenland National Park. The size of the region is about 375 km east-west and 200 km north-south, with an estimated area of 57 000 km²

The area is mountainous with elevations to 1 950 m in the heavily glaciated Roosevelt Range and to comparable heights in the little-explored H.H. Benedict Range. The area is free of Greenland’s inland ice cap.

Being mostly north of the 82°N parallel, it contains the most northerly ice-free region of the world, mostly in Southern Peary Land. Precipitation levels are so low (only about 25 to 200 mm per year, all as snow) that it is called a polar desert.

Ise Bay and Chukyo Metropolitan Area, Japan – November 19th, 2009

35.1N 136.9E

November 19th, 2009 Category: Image of the day, Rivers

Japan - September 24th, 2009

Japan - September 24th, 2009

Ise Bay, in Japan, is surrounded by large grey urban areas that creep up the mountains of Honshu Island. The bay is located at the mouth of the Kiso River, between the Mie and Aichi Prefectures.

Ise Bay has an average depth of 19.5 metres, and a maximum depth of 30 metres toward the centre of the Bay. The mouth of the bay is 9 kilometres wide and is connected to the smaller Mikawa Bay by two channels, the Nakayama Channel and the Morosaki Channel. Mikawa Bay is subsequently joined to the Pacific Ocean by the Irako Channel which ranges from 50 to 100 metres in depth.

Much of the surrounding urban area visible here is known as Chūkyō, a major metropolitan area that is centered on the city of Nagoya in Aichi Prefecture. The area makes up the most urban part of the Tōkai Region.

The population (as of 2000) of 8,739,000 over an area of 6,380 square kilometers. It is among the 50 most populous metropolitan areas in the world and is Japan’s third most populous metropolitan area, containing roughly 7% of Japan’s population.