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...config/metadata/layers/multi-mission/merged/MEaSUREs_Ice_Velocity_Antarctica.md
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The MEaSUREs Ice Velocity (Antarctica) layer provides a high-resolution digital mosaic composite of ice motion in Antarctica assembled from multiple satellite interferometric synthetic-aperture radar systems: RADARSAT-1, ERS-1 and 2, ALOS PALSAR, ENVISAT ASAR, RADARSAT-2, TerraSAR-X, TanDEM-X, Sentinel-1, and Landsat-8. | ||
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An ice sheet is a mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles) and forms in areas where snow that falls in winter does not melt entirely over the summer. Over thousands of years, the layers of snow pile up into thick masses of ice, growing thicker and denser as the weight of new snow and ice layers compresses the older layers. Ice sheets are constantly in motion, slowly flowing downhill under their own weight. Near the coast, most of the ice moves through relatively fast-moving outlets called ice streams, glaciers, and ice shelves. Within the image, the various colors, ranging from dark blue (0 m/y) to dark red (5600 m/y), indicate the velocity of the various ice outlets. | ||
An ice sheet is a mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles) and forms in areas where snow that falls in winter does not melt entirely over the summer. Over thousands of years, the layers of snow pile up into thick masses of ice, growing thicker and denser as the weight of new snow and ice layers compresses the older layers. Ice sheets are constantly in motion, slowly flowing downhill under their own weight. Near the coast, most of the ice moves through relatively fast-moving outlets called ice streams, glaciers, and ice shelves. Within the image, the various colors, ranging from dark blue (0 m/yr) to dark red (5600 m/yr), indicate the velocity of the various ice outlets. | ||
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The MEaSUREs Ice Velocity (Antarctica) layer’s sensor and imagery resolution is 450 m, and the temporal resolution is 15 years. | ||
The MEaSUREs Ice Velocity (Antarctica) layer’s sensor and imagery resolution is 450 m, and the temporal coverage is 15 years. | ||
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References: NSIDC-0484 [doi:10.5067/MEASURES/CRYOSPHERE/nsidc-0484.001](https://doi.org/10.5067/MEASURES/CRYOSPHERE/nsidc-0484.001); [NSIDC Quick Facts on Ice Sheets](https://nsidc.org/cryosphere/quickfacts/icesheets.html) | ||
References: NSIDC-0484 [doi:10.5067/D7GK8F5J8M8R](https://doi.org/10.5067/D7GK8F5J8M8R); [NSIDC - Ice Sheets](https://nsidc.org/learn/parts-cryosphere/ice-sheets) |
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.../config/metadata/layers/multi-mission/merged/MEaSUREs_Ice_Velocity_Greenland.md
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The MEaSUREs Ice Velocity (Greenland) layer reports seasonal (winter) ice-sheet-wide velocity maps for Greenland derived from Interferometric Synthetic Aperture Radar (InSAR) data obtained by RADARSAT-1, the Advanced Land Observation Satellite (ALOS), and the TerraSAR-X satellite. | ||
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An ice sheet is a mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles) and forms in areas where snow that falls in winter does not melt entirely over the summer. Over thousands of years, the layers of snow pile up into thick masses of ice, growing thicker and denser as the weight of new snow and ice layers compresses the older layers. Ice sheets are constantly in motion, slowly flowing downhill under their own weight. Near the coast, most of the ice moves through relatively fast-moving outlets called ice streams, glaciers, and ice shelves. Within the image, the various colors, ranging from dark blue (0 m/y) to dark red (1600 m/y), indicate the velocity of the various ice outlets. | ||
An ice sheet is a mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles) and forms in areas where snow that falls in winter does not melt entirely over the summer. Over thousands of years, the layers of snow pile up into thick masses of ice, growing thicker and denser as the weight of new snow and ice layers compresses the older layers. Ice sheets are constantly in motion, slowly flowing downhill under their own weight. Near the coast, most of the ice moves through relatively fast-moving outlets called ice streams, glaciers, and ice shelves. Within the image, the various colors, ranging from dark blue (0 m/yr) to dark red (16000 m/yr), indicate the velocity of the various ice outlets. | ||
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The MEaSUREs Ice Velocity (Greenland) layer's sensor and imagery resolution is 500 m, and the temporal resolution is 5-6 months. | ||
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References: NSIDC-0478 [doi:10.5067/OC7B04ZM9G6Q](https://doi.org/10.5067/OC7B04ZM9G6Q); [NSIDC Quick Facts on Ice Sheets](https://nsidc.org/cryosphere/quickfacts/icesheets.html) | ||
References: NSIDC-0478 [doi:10.5067/OC7B04ZM9G6Q](https://doi.org/10.5067/OC7B04ZM9G6Q); [NSIDC - Ice Sheets](https://nsidc.org/learn/parts-cryosphere/ice-sheets) |
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config/default/common/config/metadata/layers/viirs/Chlorophyll_a.md
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### About Chlorophyll *a* | ||
Chlorophyll is a light harvesting pigment found in most photosynthetic organisms. In the ocean, phytoplankton all contain the chlorophyll pigment, which has a greenish color. Derived from the Greek words _phyto_ (plant) and _plankton_ (made to wander or drift), _phytoplankton_ are microscopic organisms that live in watery environments, both salty and fresh. Some phytoplankton are bacteria, some are protists, and most are single-celled plants. The concentration of chlorophyll *a* is used as an index of phytoplankton biomass. Phytoplankton fix carbon through photosynthesis, taking in dissolved carbon dioxide in the sea water and producing oxygen, enabling phytoplankton to grow. Changes in the amount of phytoplankton indicate the change in productivity of the ocean and as marine phytoplankton capture almost an equal amount of carbon as does photosynthesis by land vegetation, it provides an ocean link to global climate change modeling. The Chlorophyll *a* product is therefore a useful product for assessing the “health” of the ocean. The presence of phytoplankton indicates sufficient nutrient conditions for phytoplankton to flourish, but harmful algal blooms (HABs) can result when high concentrations of phytoplankton produced toxins build up. Known as red tides, blue-green algae or cyanobacteria, harmful algal blooms have severe impacts on human health, aquatic ecosystems and the economy. Chlorophyll features can also be used to trace oceanographic currents, atmospheric jets/streams and upwelling/downwelling/river plumes. Chlorophyll concentration is also useful for studying the Earth’s climate system as it is plays an integral role in the Global Carbon Cycle. More phytoplankton in the ocean may result in a higher capture rate of carbon dioxide into the ocean and help cool the planet. | ||
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References: [OceanColor Web - Level 1&2 Browsers](https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am); [Earthdata Algorithm Publication Tool - Chlorophyll a](https://www.earthdata.nasa.gov/apt/documents/chlor-a/v1.0); [NASA Earth Observations - Chlorophyll Concentration](https://neo.gsfc.nasa.gov/view.php?datasetId=MY1DMM_CHLORA) | ||
References: [OceanColor Web - Level 1&2 Browsers](https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am); [Earthdata - Chlorophyll a](https://www.earthdata.nasa.gov/apt/documents/chlor-a/v1.0); [NASA Earth Observations - Chlorophyll Concentration](https://neo.gsfc.nasa.gov/view.php?datasetId=MY1DMM_CHLORA) |
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