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Haze Over Shanghai and Yangtze River Mouth, China

31.2N 121.4E

February 11th, 2013 Category: Climate Change, Clouds, Rivers, Sediments

China – January 25th, 2013

Haze hangs in the air over Shanghai (bottom right), the mouth of the Yangtze River and the surrounding area. Haze refers to weather with air humidity of 80 percent or below, and is different from fog, which occurs when humidity in the air is more than 90 percent. It forms when concentrations of dust and smog in the air are high.

Shanghai, like Beijing, classifies haze as light, moderate or heavy. Light haze means that outdoor visibility is between five and ten kilometers; with moderate haze, visibility is between two and five kilometers; heavy haze means visibility is less than two kilometers.

Experts said that haze contains substances harmful to the respiratory tract and lungs so people should stay indoors during moderate and heavy haze days. Long exposure to haze can lead to coryza, bronchitis and even lung cancer.

Haze Over Yangtze River Delta and van Kármán Vortex Streets by Jeju Island, China and Korea – February 18th, 2013

33.4N 126.5E

February 18th, 2013 Category: Clouds, Image of the day, Sediments

China – January 28th, 2013

Haze hangs over northeastern China, particularly over the plains by the Yangtze River Delta. The delta comprises the triangular-shaped territory of Wu-speaking Shanghai, southern Jiangsu province and northern Zhejiang province of China, by where the Yangtze River drains into the East China Sea.

The urban build-up in the area has given rise what may be the largest concentration of adjacent metropolitan areas in the world. It covers an area of 99600 km2 and is home to over 105 million people as of 2010, of which an estimated 80 million is urban.

Visible to the east, offshore, is the island and Korean province of Jeju, south of the Korean Peninsula (upper right quadrant). Streaming off the island to the south are Van Kármán vortex streets, a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies (in this case, the island of Jeju).

Haze Over Northeastern China, From Shanghai to Beijing

39.9N 116.4E

January 28th, 2013 Category: Climate Change, Clouds, Rivers

China – January 26th, 2013

A thick haze hangs over the plains northeastern China, thinning near the coast. It veils cities including Shanghai (bottom center) and Beijing (upper left quadrant), as well as the mouth of the Yangtze River (by Shanghai), and reaches the shores of the Bohai Sea (above center).

Haze forms when concentrations of dust, smoke and/or pollutants in the air are high. Since it contains substances harmful to the respiratory tract and lungs, last year Chinese authorities set tougher rules to combat air pollution by ordering all big cities to monitor tiny particles that do serious damage to health. Stricter air pollution monitoring standards were ordered for Beijing, Shanghai, Chongqing, Tianjin, 27 provincial capitals and three industrial belts: the Yangtze and Pearl river deltas and Beijing’s hinterland. Another 113 cities must adopt new standards next year and all but the smallest cities by 2015.


Sediments in Bohai Sea and from Yangtze River, China – October 25th, 2012

31.2N 121.4E

October 25th, 2012 Category: Image of the day, Rivers, Sediments

China – October 23rd, 2012

Sediments fill the Bohai Sea (upper left quadrant) and line the coast of northeastern China from the Shandong (or Jiaodong) Peninsula (the eastern limite of the Bohai Sea) to near Shanghai and the mouth of the Yangtze River (below). Sediments can also be observed on the right side of the image, framing the west coast of the Korean Peninsula.

Sediments Pouring Forth from Yangtze River, China

31.2N 121.4E

September 17th, 2012 Category: Rivers, Sediments

China – August 31st, 2012

Sediments pour forth from the mouth of the Yangtze River (bottom edge), the longest river in Asia, and the third longest in the world. It flows for 6,418 kilometres (3,988 mi) from the glaciers on the Qinghai-Tibet Plateau in Qinghai eastward across southwest, central and eastern China before emptying into the East China Sea at Shanghai. It is also one of the biggest rivers by discharge volume in the world. In recent years, the river has suffered from industrial pollution, agricultural run-off, siltation, and loss of wetland and lakes, which exacerbates seasonal flooding.

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