Brazil’s Negro River Reaches Record Low
acquired December 10, 2010 download large image (6 MB, JPEG, 4200x6800)
acquired December 10, 2010 download GeoTIFF file (66 MB, TIFF, 4200x6800)
Brazil’s Negro River Reaches Record Low
acquired December 9, 2008 download large image (6 MB, JPEG, 4200x6800)
acquired December 9, 2008 download GeoTIFF file (72 MB, TIFF, 4200x6800)
acquired December 9, 2008 - December 10, 2010 download Google Earth file (KMZ)

Widespread, severe drought gripped much of the Amazon Basin in 2010, straining the network of water that makes up the Amazon River. By December 3, one of the Amazon’s largest tributaries, the Negro River, reached a record-low 13.63 meters at the port in Manaus. These images, taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite, illustrate the extent of the change in the river system.

The top image is from December 10, 2010, while the lower image was taken on December 9, 2008. The images include both infrared and visible light in a combination that highlights the presence of water of the ground. Clear water is black, while sediment-laden water, such as the Amazon River, is dark blue. Clouds are pale blue and plant-covered land is green. The city of Manaus is light tan.

The Negro River is significantly smaller in 2010 than in 2008. The most notable difference is in the braided channels northwest of Manaus. Many of the channels disappeared in 2010, and all are shrunken. The main body of the river near Manaus is narrower. Every body of water in the scene, including the Amazon River, also changed. Tan islands dot the Amazon where water had been in 2008.

According to news reports, the drop in the water level stranded villages that rely on the rivers for transportation and caused food and water shortages. The record low at the Negro River comes just 16 months after the river set a record high of 29.77 meters, flooding Manaus.

The 2010 drought occurred on the heels of a similar “once-in-a-century” drought in 2005. In both cases, the dry weather was connected to water temperatures in the tropical Atlantic Ocean, which were much warmer than normal through most of 2010. The warm water altered weather patterns, pulling rain to the north and keeping the Amazon dry. Low humidity and high temperatures accompanied the drought, leading to extensive fires and poor air quality.

  1. References

  2. Australian Broadcasting Corporation News. (2010, September 16). Amazon shrinks as drought grips Brazil. Accessed December 10, 2010.
  3. Centro de Previsão de Tempo e Estudos Climáticos. (2010, November 22). Fenômeno La Niña em fase madura no Pacífico equatorial. (Portuguese). INPE. Accessed December 10, 2010.
  4. Grudgings, S. (2010, November 29). Special report—Weird weather leaves Amazon thirsty. Reuters. Accessed December 10, 2010.
  5. Serviço Geológico do Brasil. (2010, December 3). O Rio Negro atingiu a vazante máxima histórica de 13,63 metros. (Portuguese) Accessed December 10, 2010.
  6. Tollefson, J. (2010, October 29). Drought strikes the Amazon rainforest again. Nature News. Accessed December 10, 2010.

NASA images courtesy the MODIS Rapid Response Team at NASA GSFC. Caption by Holli Riebeek.

Terra - MODIS

Brazil’s Negro River Reaches Record Low

December 11, 2010
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