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Confluence of Tapajós and Amazon Rivers, Brazil

2.4S 54.6W

November 11th, 2012 Category: Rivers

Brazil – November 10th, 2012

This image shows the Tapajós River (visible as a thick, blue band) joining the  Amazon River (brown with sediments, meandering horizontally across the image center). The Tapajós runs through a humid, hot valley and pours into the Amazon River 500 miles above Pará.  It is about 1200 miles long. For its last 100 miles it is from 4 to 9 miles wide and much of it very deep. The valley of the Tapajós is bordered on both sides by bluffs. They are from 300 to 400 feet high along the lower river; but a few miles above Santarém, they retire from the eastern side and do not approach the Amazon flood-plain until some miles below Santarém. Upon opening the full image, the mouth of the Amazon can be seen to the northeast.

Vegetation Index and Deforestation Near Manáus and Santarém, Brazil – December 2nd, 2009

3.1S 60W

December 2nd, 2009 Category: Climate Change, Image of the day, Rivers

Brazil - November 19th, 2009

Brazil - November 19th, 2009

This FAPAR image shows an area of Amazon rainforest in Brazil, between Santarém in the state of Pará, where the Tapajós joins the Amazon River (right edge), and Manáus at the convergence of the Negro and Solimões (Upper Amazon) Rivers (left). FAPAR stands for Fraction of Absorbed Photosynthetically Active Radiation, which corresponds to the  area’s vegetation index.

In FAPAR images, the color spectrum over land runs from red (1.0), to green, to yellow and white (0.0), while bodies of water, such as the Amazon River running through the image center, generally appear blue.

High photosynthetic activity is present in dark red regions, such as those concentrated on the left side of the image. The photosynthetic activity decreases as one moves to the right side of the image, although green areas are also productive. Yellow to white zones, with the exception of clouds, indicate a low degree of photosynthetic activity; however, few such areas are present here.

Upon opening the full image, the distinctive herringbone pattern of some deforested areas is visible. Near the Amazon River, these areas appear as yellow lines amidst the surrounding green, while in the upper left quadrant the lines are green in contrast to the surrounding dark red.

The Amazon Basin in the Brazilian States of Amazonas and Pará

3.1S 60W

October 11th, 2009 Category: Rivers

Brazil - September 29th, 2009

Brazil - September 29th, 2009

The Amazon Basin, the largest drainage basin in the world, covers about 40 percent of South America, an area of approximately 6,915,000 square kilometres (2,670,000 sq mi).

In this image, part of the basin in Brazil is visible, from the confluence of the Negro and Solimões (Upper Amazon) Rivers near Manaus in the state of Amazonas (left), to the confluence of the Tapajós and Amazon Rivers near Santarém in the state of Pará (right). The full image shows more of the Negro River northwest of Manaus as well.

The area covered by the water of the Amazon River and its tributaries more than triples over the course of a year. In an average dry season 110,000 square kilometres (42,000 sq mi) of land are water-covered, while in the wet season the flooded area of the Amazon Basin rises to 350,000 square kilometres (135,000 sq mi) .