Gargantuan algae bloom fouls beaches of Chinese costal city

BEIJING ? In what has become an annual summer scourge, the coastal Chinese city of Qingdao has been hit by a near-record algae bloom that has left its popular beaches fouled with a green, stringy muck.

The State Oceanic Administration said an area larger than the state of Connecticut had been affected by the mat of ?sea lettuce,? as it is known in Chinese, which is generally harmless to humans but chokes off marine life and invariably chases away tourists as it begins to rot.

Some beachgoers appeared to be amused by the outbreak, at least according to the Chinese media, which in recent days has featured startling images of swimmers lounging on bright green beds of algae, tossing it around with glee or piling it atop of one another as if it were sand.

Local officials, however, are less enthused. Last month, they declared a ?large-scale algae disaster,? dispatching hundreds of boats and bulldozers to clean up the waters off Qingdao, a former German concession in Shandong province that is famous for its beer and beaches. As of Monday, workers and volunteers had cleared about 19,800 tons of the algae, according to the Qingdao government. While valued for its nutrition ? or as an ingredient in fertilizers and biomass energy production ? algae in large quantities can prove dangerous as it decomposes, producing toxic hydrogen sulfide gas. It also smells like rotten eggs.

The green tide, spread over 7,500 square miles, is thought to be twice the size of an outbreak in 2008 that threatened sailing events during the Beijing Olympics, which took place around Qingdao.

An outbreak in 2009 was even bigger, affecting a stretch of the Yellow Sea nearly as large as West Virginia.

Although biologists are at a loss to explain the most recent algae bloom, scientists suspect it is connected to pollution and increased seaweed farming in the province just south of Shandong.

The green tides were first reported in Qingdao in 2007.

A group of researchers believe that the algae that washes up around Qingdao originates farther south in seaweed farms along the coast of Jiangsu province. The farms grow porphyra, known as nori in Japanese cuisine, on large rafts in coastal waters. The rafts attract a kind of algae called ulva prolifera, and when the farmers clean them off each spring they spread the fast-growing algae out into the Yellow Sea, where it finds nutrients and warm temperatures ideal for blooming.

Source: http://news.nationalpost.com/2013/07/05/gargantuan-algae-bloom-fouls-beaches-of-chinese-costal-city/

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