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Posts tagged Lakes

Dutch Coastal Bodies of Water: Markermeer, IJsselmeer and Wadden Sea – May 31st, 2010

May 31st, 2010 Category: Image of the day, Lakes

Netherlands - April 18th, 2010

Netherlands - April 18th, 2010

Several bodies of water are visible near the coast of the Netherlands: the Markermeer (bright green), the IJsselmeer (dark blue) and the Wadden Sea (green, closest to the open ocean).

The Markermeer is a 700 km² lake in the central Netherlands in between North Holland, Flevoland and its larger sibling, the IJsselmeer. A shallow lake at some 3 to 5 m in depth, it is named after the small former island, now peninsula, of Marken that lies within it.

IJsselmeer (sometimes translated as Lake IJssel, alternative international spelling: Lake Yssel) is a shallow lake of 1100 km² in the central Netherlands bordering the provinces of Flevoland, North Holland and Friesland, with an average depth of 5 to 6 m. It is named after the IJssel river that drains into it via a smaller lake, the Ketelmeer. The IJsselmeer is the largest lake in Western Europe.

The Wadden Sea (Dutch: Waddenzee) is an intertidal zone in the southeastern part of the North Sea. It lies between the coast of northwestern continental Europe and the range of Frisian Islands, forming a shallow body of water with tidal flats and wetlands.

Snow Around the Great Salt Lake, USA

February 27th, 2010 Category: Lakes, Salt Flats

USA - February 23rd, 2010

USA - February 23rd, 2010

While many areas of terrain near the Great Salt Lake (center right) often appear whitish as they are covered in salt flats, the bright white areas in this image are caused by snow over the states of Nevada (bottom left), Utah (bottom right), Idaho (upper right) and Oregon (upper left).

Here, the Great Salt Lake Desert, east of the lake, appears tan in comparison with the white snow. The lower half of the lake itself appears brighter green than its darker northern half due to a concrete causeway, the Lucin Cutoff, which runs horizontally across and restricts the flow of water.

Lakes in Tibet – November 10th, 2008

November 10th, 2008 Category: Image of the day, Lakes

Lakes in Tibet, North of the Himalayas - November 7th, 2008

Lakes in Tibet, North of the Himalayas - November 7th, 2008

Close-up of lakes

Close-up of lakes

In the upper half of this image we can see many lakes in Tibet, just North of the border with Nepal.

The lake on the right surrounded by snow is Lake Namtso (Nam Co), the highest salt lake in the world. It lies at an elevation of 4,718 m, and has a surface area of 1,870 square kilometres.

To the West, the next large body of water is Siling Co, with Lake Gering to the South. Moving westward, other lakes include Lake Ngangze, Tangra Yamco, Zhari Namco, and Xuru Co.

Tibet is a plateau region in Central Asia with an average elevation of 4,900 metres (16,000 ft). It is the highest region on Earth and is commonly referred to as the “Roof of the World.”

The Tibetan climate is severely dry nine months of the year, with an average annual snowfall of only 18 inches due to the rain shadow effect (whereby mountain ranges prevent moisture from the ocean from reaching the plateaus). Western passes receive small amounts of fresh snow each year but remain traversable all year round.

Photograph of Lake Namtso

Photograph of Lake Namtso

Low temperatures are prevalent throughout the western regions. The Indian monsoon exerts some influence on eastern Tibet. Northern Tibet is subject to high temperatures in the summer and intense cold in the winter.

In the middle right portion of the image, in the Himalayas on the Nepalese-Tibetan border, we can see Mount Everest. It is the highest mountain on Earth, with a summit of 8,848m (29,029ft) above sea level.

In the lower, greener section of the image we can see India and the Ganges River. The grey patch on the lower left is due to smoke from fires burning in India at that time.

source Wikipedia

View of Lake Michigan, USA – October 15th, 2008

October 15th, 2008 Category: Image of the day, Lakes

Lake Michigan - October 9th, 2008Lake Michigan

Lake Michigan - October 9th, 2008

Lake Michigan is one of the five Great Lakes of North America. It is the only Great Lake located completely within the borders of the United States; the others are shared with Canada. It is bounded, from west to east, by the U.S. states of Wisconsin, Illinois, Indiana, and Michigan.
The lake is slightly larger than the country of Croatia. It has a surface area of 22,400 square miles (58,016 km²), making it the largest lake entirely within one country by surface area, and the fifth largest lake in the world. It is 307 miles (494 km) long by 118 miles (190 km) wide with a shoreline 1,640 miles (2,633 km) long. The lake’s average depth is 279 feet (85 m), while its greatest depth is 923 feet (281 m).

In the image we can see Lake Michigan (to the left), as well as Lake Huron (to the right) and a section of Lake Erie (far right). Geologically and hydrologically, Michigan and Huron are the same body of water (sometimes called Lake Michigan-Huron), but are geographically distinct. Counted together, it is the largest fresh water body in the world by surface area. The Mackinac Bridge is generally considered the dividing line between them. The city of Chicage is also visible on the western side of the southern shore of Lake Michigan.

The Milwaukee Reef, running under Lake Michigan from Milwaukee to a point between Grand Haven and Muskegon (both cities in the middle of the eastern lake shore), divides the lake into northern and southern pools. Each pool has a counterclockwise flow of water, deriving from rivers, winds, and the Coriolis effect. Prevailing westerly winds tend to move the surface water toward the east, producing a moderating effect on the climate of western Michigan. There is a mean difference in summer temperatures of 5 to 10 degrees between the Wisconsin and Michigan shores.

source Wikipedia

Massive Sand Storm over Iraq – Update

September 16th, 2008 Category: Dust Storms

Sand Storm over Iraq - Earth ViewIraq

Sand Storm over Iraq - Earth View

Composite Image of 2 ASAR passes

Composite Image of 2 ASAR passes

From the false-colored image on the left, generated by two Envisat/ASAR passes on the 12th and 15th of September, the zones that have experienced changes can be seen in red within the grey square.

The sandstorm is not clearly visible since the radar images are not sensitive enough to detect the dust particles; however, we can clearly see the agitated lake surfaces in the zones hit by the storm.

The red lake in the lower portion of the image is Lake Tharthar, one of the largest lakes in Iraq, located 120 kilometers north of Baghdad (which appears in the image as a white area near the lake) between the Tigris and the Euphrates rivers.

In the top right part of the image we can see Lake Urmia, the largest lake in Iran (and the second largest salt lake in the world), near Turkey. From the false-colored image we can tell that between the 12th and the 15th of September there have been changes, probably due to sediments.