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Climate Change and Fluctuating Water Levels in Lake Victoria, East Africa – April 5th, 2013

1.2S 32.7E

April 5th, 2013 Category: Climate Change, Image of the day, Lakes

Uganda – April 3rd, 2013

Lake Victoria (below) is the second largest fresh water lake in the world and is shared by three East African States: Kenya (6%), Tanzania (52%) and Uganda (42%). The lake has a total length of 3,440 kms and 240 kms wide from East to West and is 1,134 meters above sea level with maximum depth of 82m. Its surface area is 68,870 km2, with a catchment area of 180,950 km2. The lake is generally shallow with maximum depth of 84 meters and mean depth of 40 meters.

Lake Victoria has historically had abundant fish catches; however, these have a positive correlation with the lake’s water level, which has been fluctuating due to climate change and human activities in the region. Catches reduced to between 60% and 70% during the current reduction of water level in Nyanza Gulf. There is increased pressure on land for agricultural use due to population pressure in the country, and increased demand for water related usage for socioeconomic development across the region (click here for more information).

Changes in Oxygen Levels in Lake Victoria

1.2S 32.7E

August 14th, 2012 Category: Lakes

Tanzania and Uganda – August 14th, 2012

This thumbnail image focuses on the jagged shoreline of the southern half of Lake Victoria, although the entire body of water can be observed upon opening the full image. The lake occupies a shallow depression in Africa and has a maximum depth of 84 metres (276 ft) and an average depth of 40 metres (130 ft). Its catchment area covers 184,000 square kilometers (71,040 sq mi). The lake has a shoreline of 4,828 kilometres (3,000 mi).

Lake Victoria receives almost all (80%) of its water from direct precipitation. Average evaporation on the lake is between 2–2.2 metres (6 ft 7 in–7 ft 3 in) per annum, almost double the precipitation of riparian areas.

The lake exhibits eutrophic conditions. In 1990–1991, oxygen concentrations in the mixed layer were higher than in 1960–1961, with nearly continuous oxygen supersaturation in surface waters. Oxygen concentrations in hypolimnetic waters (i.e. the layer of water that lies below the thermocline, is noncirculating, and remains perpetually cold) were lower in 1990–1991 for a longer period than in 1960–1961. The changes in oxygenation are considered consistent with measurements of higher algal biomass and productivity.

These changes have arisen for multiple reasons: successive burning within its basin, soot and ash from which has been deposited over the lake’s wide area; from increased nutrient inflows via rivers, and from increased pollution associated with settlement along its shores.

Kampala Near Lake Victoria, Uganda – February 15th, 2012

0.3N 32.5E

February 15th, 2012 Category: Image of the day, Lakes

Uganda- February 3rd, 2012

This orthorectified wide-swath ASAR image focuses on Lake Victoria, an African Great Lake and the continent’s largest lake by surface area, at 68,800 square kilometres (26,600 sq mi). It is the second largest freshwater lake by surface area in the world. In terms of its volume, Lake Victoria is the world’s eighth largest continental lake, and it contains about 2,750 cubic kilometers (2.2 billion acre-feet) of water.

Visible as a white area near the northern shores is Kampala, the largest city and capital of Uganda. Kampala features a tropical wet and dry climate, however due to city’s higher altitudes, average temperatures are noticeably cooler than what is typically seen in other cities with this type of climate. Another facet of Kampala’s weather is that it features two distinct wet seasons. There is a lengthy rainy season from August through December and another shorter rainy season that begins in February and lasts through June.

Sun Glint Highlighting Contours of Lake Victoria, Uganda, Tanzania and Kenya

1.2S 32.7E

February 12th, 2012 Category: Lakes

Uganda, Kenya and Tanzania - February 5th, 2012

Sun glint causes the waters of Lake Victoria, on of the African Great Lakes, to appear silvery in color, and makes the ragged contours of the shoreline easily visible against the surrounding brown terrain. The lake has a shoreline of 4,828 kilometres (3,000 mi), with islands constituting 3.7% of this length, and is divided among three countries: Kenya (6% or 4,100 km2/1,600 sq mi), Uganda (45% or 31,000 km2/12,000 sq mi) and Tanzania (49% or 33,700 km2/13,000 sq mi).

With a surface area of 68,800 square kilometres (26,600 sq mi), Lake Victoria is Africa’s largest lake by area, and it is the largest tropical lake in the world. Lake Victoria is the world’s second largest freshwater lake by surface area (only Lake Superior in North America is larger). In terms of its volume, Lake Victoria is the world’s eighth largest continental lake, and it contains about 2,750 cubic kilometers (2.2 billion acre-feet) of water.

Jagged Shoreline of Lake Victoria in Tanzania

1.2S 32.7E

August 4th, 2011 Category: Lakes

Tanzania - August 1st, 2011

With a surface area of 68,800 square kilometres (26,600 sq mi), Lake Victoria is Africa’s largest lake by area, and it is the largest tropical lake in the world.  It is divided among three countries: Kenya (6% or 4,100 km2/1,600 sq mi), Uganda (45% or 31,000 km2/12,000 sq mi) and Tanzania (49% or 33,700 km2/13,000 sq mi).

This image focuses on the southern part of the lake, in Tanzania. The western portion of the country between Lakes Victoria, Tanganyika and Malawi consists of flat land that has been categorised as part of the Central Zambezian Miombo woodlands ecoregion. The centre of Tanzania is a large plateau.

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