Lake Puma Yumco

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Lake Puma Yumco
普莫雍錯
PumaYumco winter mosaic.jpg
Puma Yumco in winter. The north-south white line is a possible ice ridge, formed by east-west winds subsequently highlighted by snow.
Location Tibetan Plateau
Coordinates 28°34′N 90°25′E / 28.567°N 90.417°E / 28.567; 90.417Coordinates: 28°34′N 90°25′E / 28.567°N 90.417°E / 28.567; 90.417
Type ultraoligotrophic
Max. length 32 km (20 mi)
Max. width 14 km (8.7 mi)
Surface area 880 km2 (340 sq mi)
Surface elevation 5,030 m (16,500 ft)
Lake Puma Yumco (centre) and Lake Yamzho Yumco from space, November 1997

Lake Puma Yumco (Chinese: 普莫雍錯) is a lake located at 5,030 metres (16,503 ft) above mean sea level on the southern Tibetan Plateau. It is 32 km (20 mi) long, 14 km (8.7 mi) wide, and covers an area of 880 km2 (340 sq mi).[1] Streams of water from the snow-capped surrounding mountains feed the lake, but the lake has no outlet. Some sediment can be seen entering the lake at its western end.

Puma Yumco literally means The Blue Jewel which is floating in the sky. The lake freezes in winter and is crossed by shepherds with their sheep. Since the climate is warming, the ice is becoming thinner and thus creates a problem for the 120 people living off and around the lake.[citation needed]

The lake is considered ultraoligotrophic, meaning that nutrient concentrations in both the water column and lake sediments are extremely low. Water in such lakes tends to be blue to blue-green and to have high clarity due to low levels of photosynthesizing organisms such as phytoplankton.

During the winter, the lake develops intricate ice block patterns on the surface, ranging from less than ten to hundreds of metres in diameter. The ice pattern is caused by repeated cycles of freezing, fracturing, and refreezing of the ice due to variations in temperature and wind-induced ice motion.

References[edit]

  1. ^ Herdendorf, Charles E. (1982). "Large Lakes of the World". Journal of Great Lakes Research. 8 (3): 379–412. doi:10.1016/S0380-1330(82)71982-3.