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Posts tagged Northeast

Fields of Sand Dunes Along Coast of Northeast Brazil

2.8S 40.5W

February 18th, 2013 Category: Deserts

Brazil – January 19th, 2013

The northeast of Brazil (known locally as the Nordeste region) is characterized by semi dessertic weather and characteristics such as hot and dry temperatures, drought, lack of or scant rainfall, eroded soil and high evapotranspiration. Many coastal areas in region are covered by vast fields of active and stabilized coastal sand dunes.

Scientific studies show the vast prevalence of active sand dunes along the coast of NE Brazil in a tropical climate (average yearly rainfall above 1000 mm) results from the high powered trade winds, mostly during the dry season. Many stabilized dunes are found along this coast, side by side with the active dunes. A hysteresis model based on changes in wind power can explain the co-existence of stabilized and active dunes in the same area.

Vegetation on sand dunes in NE Brazil thrives when the rainfall is above 400 mm and the wind power is low. The dunes during the wetter periods were stabilized by vegetation due to low wind power and not because of the increased precipitation (click here for more information).

Vegetation Index of Northeastern Brazil Good Parallel to Coast

7.2S 38W

March 24th, 2012 Category: Vegetation Index

Brazil - January 4th, 2012

This FAPAR image shows the vegetation index of northeastern Brazil. The strip of green false-coloring framing the coastline indicates good photosynthetic activity in that area, with the exception of a small area of northern coastline in the upper right quadrant that appears yellow, indicating low activity. This zone of low activity extends a ways inland, parallel to the east coast, before gradually increasing to patches of high activity (rusty red) near the left edge.

Snow Covering the Northeastern USA

41.8N 72.3W

January 27th, 2011 Category: Snapshots

USA - January 15th, 2011

Snow covers much of the terrain of the northeastern United States of America. Here, it can be seen spreading across the states of New York, Connecticut, Rhode Island, New Hampshire, Vermont and Maine. Notable places dusted in snow include New York’s Long Island (lower left corner) and Cape Cod (hook-shaped peninsula to the right).

Although this image is from mid-January, this week another  storm caught much of the East Coast off guard with its ferocity, tearing through with lightning, thunder and mounds of wet snow, leaving nearly 300,000 customers around the nation’s capital without power Thursday and forcing people to shovel out all over again.

The forecast had called for up to a foot of snow in parts of the region but the storm brought far more in spots. New York got 19 inches, Philadelphia 17. Snow totals in the Washington area ranged from about 3 inches to nearly 7.