To what extent is an area

Feasibility study on mangrove reforestation project. Global status of mangrove ecosystems. Commission on Ecology Papers No.

To what extent is an area

Rebecca Lindsey August 15, In the Arctic Ocean, the area covered by sea ice grows and shrinks over the course of the year. Each fall, as less sunlight reaches the Arctic and air temperatures begin to drop, additional sea ice forms.

The total area covered by ice increases through the winter, usually reaching its maximum extent in early March. Once spring arrives with more sunlight and higher temperatures, the ice begins to melt back, shrinking to its minimum extent each September.

Alaska Department of Fish and Game

Summer ice declines have been especially rapid since Explore this interactive graph: Click and drag to display different parts of the graph.

To squeeze or stretch the graph in either direction, hold your Shift key down, then click and drag. This graph shows the average area covered by sea ice during September each year.

To what extent is an area

Just as ponds and lakes in northern states develop a layer of ice on their surfaces during cold winters, the surface of the Arctic Ocean also freezes, forming sea ice.

Ice crystals appear on the sea's surface, and if the air is cold enough, the crystals expand to form a slushy mix, then a solid covering of ice that can thicken over time.

To what extent is an area

Early observations of sea ice coverage in the Arctic come to us both from the oral histories of native populations and from the records of early European mariners who were seeking a "Northwest Passage" to the lucrative markets in Asia.

For as long as humans have been keeping track, large areas of the Arctic Ocean have remained covered by sea ice throughout the year. However, over the past 30 years, the area covered by ice has shown a dramatic decrease. Since satellite-based measurements began in the late s, data show a trend of more ice melting away during summers and less new ice forming during winters.

This was the eighth smallest extent of the satellite record. Monthly sea ice concentration in the Arctic during the summer melt season from April—August, ending with the daily concentration on September 13, the preliminary date of the annual minimum extent. For the first time in recorded human history, the Northwest Passage may become a useful shipping route during Arctic summer.

Ina route through the straits of the Canadian Arctic Archipelago opened for the fifth year in a row.

Area Synonyms, Area Antonyms | benjaminpohle.com

Other routes across the Arctic may also open, providing ships with viable alternatives to traveling through the Panama Canal or around the southern tip of South America. This new reality will have impacts not only on the environment, but also on the world economy and national security, as nations compete to gain rights to shipping lanes and newly accessible resources in the Arctic.

Climate scientists are particularly concerned about the decrease of sea ice because its white surface reflects up to 80 percent of incoming sunlight, deflecting additional energy away from the planet. With less ice present, the dark surface of ocean water absorbs considerably more sunlight energy, leading to further warming of the atmosphere and more melting of ice, which leads to further warming Scientists are actively studying the effects of this positive feedback loop to help them understand and predict how the observed decrease in Arctic sea ice will affect the global climate system.

Foreign Affairs, Scott G. Accessed March 17, new Extent(xmin, ymin, xmax, ymax, spatialReference) Creates a new Extent object. new Extent(json) Creates a new Extent object using a JSON object.

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Properties. Name Type Summary; cache: Object: The cache is used to store values computed from geometries that need to . The Burned Area Essential Climate Variable (BAECV) algorithm aims to fill that gap and was designed to automatically identify burned areas in all ecosystems (e.g.

forest, shrubland, and grassland) visible in Landsat 4, 5, and 7 scenes. But with such a large area affected, it’s difficult to gain a comprehensive understanding of the extent of the flooding and its severity.

Eye-witness reports or photos from certain areas provide a glimpse, but what is needed is a complete overview, rich in detail and scope. Arctic sea ice has been steadily thinning, even in the last few years while the surface ice (eg - sea ice extent) increased slightly.

Consequently, the total amount of Arctic sea ice .

Has Arctic sea ice returned to normal?

The total area covered by ice increases through the winter, usually reaching its maximum extent in early March. Once spring arrives with more sunlight and higher temperatures, the ice begins to melt back, shrinking to its minimum extent each September.

Variable-length — Typically, you use a variable-length extent as an overflow file when all fixed-length extents have been exhausted. For DB and BI extents, you can define one variable-length extent for each area, and it must be the last extent in the area.

Extent | Define Extent at benjaminpohle.com