Autumn is definitely here: Nasa's stunning satellite images show fall colours appearing across the northwest


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Even though we are just a few days into fall, the traditional colours of autumn are already visible from space.

Nasa today revealed these stunning images from its Terra satellite capturing fall colors around the Great Lakes and New England. 

The brown and orange shades are most pronounced in the Upper Peninsula of Michigan, northern Wisconsin, upstate New York, New Hampshire, Vermont, Maine, and southern Quebec and Ontario.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA?s Terra satellite captured this view of fall colors around the Great Lakes on Sept. 26, 2014.    The changing of leaf color in temperate forests involves several causes and reactions, but the dominant factors are sunlight and heat.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA?s Terra satellite captured this view of fall colors around the Great Lakes on Sept. 26, 2014. The changing of leaf color in temperate forests involves several causes and reactions, but the dominant factors are sunlight and heat.

THE COLOURS OF FALL

As explained by the U.S. Forest Service, certain species of trees produce certain colors. 

Oaks generally turn red, brown, or russet; hickories become golden bronze; aspen and yellow-poplar turn golden.

Maples differ by species. 

Red maple turns brilliant scarlet; sugar maple, orange-red; and black maple, yellow. 

Leaves of some trees, such as elms, simply become brown.

The changing of leaf color in temperate forests involves several causes and reactions, but the dominant factors are sunlight and heat. 

Since temperatures tend to drop sooner and sunlight fades faster at higher latitudes, the progression of fall color changes tends to move from north to south across North America from mid-September through mid-November.

In late summer and autumn, tree and plant leaves produce less chlorophyll, the green pigment that harvests sunlight for plants to convert water and carbon dioxide into sugars. 

The subsidence of chlorophyll allows other chemical compounds in the leaves—particularly carotenoids and flavonoids—to emerge from the green shadow of summer. 

The brown and orange shades are most pronounced in the Upper Peninsula of Michigan, northern Wisconsin, upstate New York, New Hampshire, Vermont, Maine, and southern Quebec and Ontario. You can also see faint traces of phytoplankton blooms in the lakes and offshore in the North Atlantic. 

The brown and orange shades are most pronounced in the Upper Peninsula of Michigan, northern Wisconsin, upstate New York, New Hampshire, Vermont, Maine, and southern Quebec and Ontario. You can also see faint traces of phytoplankton blooms in the lakes and offshore in the North Atlantic. 

WATCHING THE EARTH

NASA launched the Earth Observing System's flagship satellite 'Terra,' named for Earth, on December 18, 1999. 

Terra has been collecting data about Earth's changing climate. 

Terra carries five state-of-the-art sensors that have been studying the interactions among the Earth's atmosphere, lands, oceans, and radiant energy. 

Each sensor has unique design features that will enable scientists to meet a wide range of science objectives. 

These compounds do not decay as fast as chlorophyll, so they shine through in yellows, oranges, and reds as the green fades. 

Another set of chemicals, anthocyanins, are associated with the storage of sugars and give the leaves of some species deep purple and red hues.

As explained by the U.S. Forest Service, certain species of trees produce certain colors. 

Oaks generally turn red, brown, or russet; hickories become golden bronze; aspen and yellow-poplar turn golden.

Maples differ by species. 

Red maple turns brilliant scarlet; sugar maple, orange-red; and black maple, yellow. 

Leaves of some trees, such as elms, simply become brown.

Weather affects the range and intensity of colors. If the weather stays above freezing, it is easier for anthocyanins to form. 

Dry weather, which increases the sugar concentration in sap, also increases the amount of anthocyanin. 

So the brightest autumn colors occur when dry, sunny days are followed by cool, dry nights.

According to a paper published last month by researchers from Princeton University, climate change could someday delay the onset of fall color changes in some species, but also extend it later into the year. 

Warmer temperatures could lengthen the growing season for some plants, though moreso at middle latitudes than high latitudes.

 



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