{ "count": 9, "next": null, "previous": null, "results": [ { "id": 4835, "url": "https://svs.gsfc.nasa.gov/4835/", "result_type": "Visualization", "release_date": "2020-06-18T00:00:00-04:00", "title": "NO2 Decline Related to Restrictions Due to COVID-19 in South America", "description": "On June 1, the World Health Organization noted that Central and South American countries have become “the intense zones” for COVID-19 transmission. The Ozone Monitoring Instrument (OMI) on board NASA’s Aura satellite provides data that indicate that restrictions on human activity have led to about a 36% decrease in NO2 levels in Rio de Janeiro, Brazil, relative to previous years. Other large cities in South America show similar decreases in NO2: 36% in Santiago, Chile; 35% in São Paolo, Brazil; and 40% in Buenos Aires, Argentina. One notable exception is in Lima, Peru, showing a 69% decrease. The large decrease may partly be associated with natural variations in weather that can, for instance, disperse air pollution more quickly. Additional analysis is required to determine the amount of the decrease of NO2 in Lima that is associated with a decrease in human activity. A notable increase in NO2 occurred in northern South America, which is likely associated with increased agricultural burning in 2020 relative to previous years. || ", "hits": 48 }, { "id": 31142, "url": "https://svs.gsfc.nasa.gov/31142/", "result_type": "Hyperwall Visual", "release_date": "2020-05-18T00:00:00-04:00", "title": "COVID-19: NASA Satellite Data Show Drop in Air Pollution Over U.S.", "description": "Tropospheric NO2 Column, March 15-April 15 2015-2019 average vs. 2020, USA regions || 3-regions_1080p.00001_print.jpg (1024x576) [141.7 KB] || 3-regions_1080p.00001_searchweb.png (320x180) [62.9 KB] || 3-regions_1080p.00001_thm.png (80x40) [5.2 KB] || 3-regions_1080p.mp4 (1920x1080) [1.9 MB] || 3-regions_720p.mp4 (1280x720) [1.0 MB] || 3-regions_1080p.webm (1920x1080) [2.3 MB] || 3-regions_2160p.mp4 (3840x2160) [5.6 MB] || ", "hits": 113 }, { "id": 4810, "url": "https://svs.gsfc.nasa.gov/4810/", "result_type": "Visualization", "release_date": "2020-04-24T00:00:00-04:00", "title": "Reductions in Pollution Associated with Decreased Fossil Fuel Use Resulting from COVID-19 Mitigation", "description": "Over the past several weeks, the United States has seen significant reductions in air pollution over its major metropolitan areas. Similar reductions in air pollution have been observed in other regions of the world. || Tropospheric NO2 Column, Animated GIF || cropped_NO2_2019_2020.gif (848x862) [54.4 MB] || cropped_NO2_2019_2020_print.jpg (1024x1040) [318.2 KB] || cropped_NO2_2019_2020_searchweb.png (320x180) [102.2 KB] || ", "hits": 133 }, { "id": 11512, "url": "https://svs.gsfc.nasa.gov/11512/", "result_type": "Produced Video", "release_date": "2014-04-01T12:45:00-04:00", "title": "Satellite Shows High Productivity From U.S. Corn Belt", "description": "Data from satellite sensors show that during the Northern Hemisphere's growing season, the Midwest region of the United States boasts more photosynthetic activity than any other spot on Earth, according to NASA and university scientists. || ", "hits": 27 }, { "id": 11420, "url": "https://svs.gsfc.nasa.gov/11420/", "result_type": "Produced Video", "release_date": "2014-01-09T00:00:00-05:00", "title": "Seasonal Glow", "description": "Scientists are now able to view the vitality of Earth’s terrestrial plant life with satellites orbiting hundreds of miles above the planet. The key lies in distinguishing the faint glow, or fluorescence, emitted by healthy plants when they convert sunlight to energy via photosynthesis. NASA researchers have detected the glow, invisible to the naked eye, with an instrument on a European meteorological satellite. Using data collected by the satellite from 2007 to 2011, they created a global map of the phenomenon that reveals how plant productivity changes through the seasons. Watch the video to see how different parts of the world brighten and dim over the course of an average year. || ", "hits": 50 }, { "id": 4100, "url": "https://svs.gsfc.nasa.gov/4100/", "result_type": "Visualization", "release_date": "2013-11-08T11:00:00-05:00", "title": "Fluorescence Visualizations in High-Resolution (Comparison to NDVI)", "description": "During photosynthesis, plants fluoresce. This faint glow is in the infrared part of the spectrum, not visible to the naked eye but detectable by satellites orbiting hundreds of miles above Earth. NASA scientists established a method to turn this satellite data into global maps of the subtle phenomenon in more detail than ever before.The new maps, released in 2013, provide a 16-fold increase in spatial resolution and a 3-fold increase in temporal resolution over the first proof-of-concept maps released in 2011. This lets scientists use fluorescence to observe, for example, variation in the length of the growing season.These visualizations of the phenomenon shows global land plant fluorescence data collected from 2007 to 2011, combined to depict a single average year. Darker greens indicates regions with little or no fluorescence; lighter greens and white indicate regions of high fluorescence.Fluorescence and Normalized Difference Vegetation Index (NDVI) are compared. A visualization is provided comparing the northern hemisphere of both data sets. Individual visualizations are also provided in a standard cylindrical equidistant projection for wrapping to a globe. The same color bars are used for both data sets for easier comparison. || ", "hits": 67 }, { "id": 11322, "url": "https://svs.gsfc.nasa.gov/11322/", "result_type": "Produced Video", "release_date": "2013-08-13T00:00:00-04:00", "title": "Blushing Botanicals", "description": "A healthy plant is a glowing plant. That's because healthy plants that engage in photosynthesis—convert sunlight to energy—also emit fluorescent light. It's the same physical process that makes everyday objects glow in the dark. While human eyes are unable to detect the faint glow from plants, satellites hundreds of miles above Earth are up to the task. A team of researchers led by NASA scientists identified the fluorescence fingerprint in data collected by an instrument on a European meteorological satellite. A visualization of the data, released in 2013, allows scientists for the first time to see global changes in terrestrial plant fluorescence over the course of a month. That means a front-row seat to track the northward migration of plant blooming during the Northern Hemisphere springtime, as well as the shut down in fall—even before changing leaf colors indicate a seasonal shift is amiss. Watch the visualization for a tour of plant fluorescence around the world. || ", "hits": 78 }, { "id": 11317, "url": "https://svs.gsfc.nasa.gov/11317/", "result_type": "Produced Video", "release_date": "2013-07-24T14:00:00-04:00", "title": "Seeing Photosynthesis From Space", "description": "NASA scientists have discovered a new way to use satellites to measure what's occurring inside Earth's land plants at a cellular level.During photosynthesis, plants emit what is called fluorescence – a form of light invisible to the naked eye but detectable by satellites orbiting hundreds of miles above Earth. NASA scientists established a method to turn this satellite data into global maps of the subtle phenomenon in more detail than ever before.The new maps – produced by Joanna Joiner of NASA's Goddard Space Flight Center in Greenbelt, Md., and colleagues – provide a 16-fold increase in spatial resolution and a 3-fold increase in temporal resolution over the first proof-of-concept maps released in 2011. Improved global measurements could have implications for farmers interested in early indications of crop stress, and ecologists looking to better understand global vegetation and carbon cycle processes.\"For the first time, we are able to globally map changes in fluorescence over the course of a single month,\" Joiner said. \"This lets us use fluorescence to observe, for example, variation in the length of the growing season.\" || ", "hits": 292 }, { "id": 4086, "url": "https://svs.gsfc.nasa.gov/4086/", "result_type": "Visualization", "release_date": "2013-07-24T13:00:00-04:00", "title": "Fluorescence Visualizations in High-Resolution", "description": "During photosynthesis, plants emit fluorescence – a form of light invisible to the naked eye but detectable by satellites orbiting hundreds of miles above Earth. NASA scientists established a method to turn this satellite data into global maps of the subtle phenomenon in more detail than ever before. The new maps, released in 2013, provide a 16-fold increase in spatial resolution and a 3-fold increase in temporal resolution over the first proof-of-concept maps released in 2011. This lets scientists use fluorescence to observe, for example, variation in the length of the growing season.A visualization of the phenomenon shows global land plant fluorescence data collected from 2007 to 2011, combined to depict a single average year. Gray indicates regions with little or no fluorescence; red, pink and white indicate regions of high fluorescence. || ", "hits": 91 } ] }