Sciences et technologies

NASA-WeeklyArcticSeaIceAge-1984-2019

Sciences et technologies — Thu, 03 Sep 2026 21:24:39 GMT

NASA video "Weekly Arctic Sea Ice Age with Graph of Ice Age By Area: 1984 - 2019" Public domain video (2:05) NASA Scientific Visualization Studio https://www.youtube.com/watch?v=QjFfcPC_4JE https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4750&button=recent This visualization shows the age of the Arctic sea ice between 1984 and 2019. Younger sea ice, or first-year ice, is shown in a dark shade of blue while the ice that is four years old or older is shown as white. The animation shows the seasonal variability of the ice, growing in the Arctic winter and melting in the summer. In addition, this also shows the changes from year to year. One significant change in the Arctic region in recent years has been the rapid decline in perennial sea ice. Perennial sea ice, also known as multi-year ice, is the portion of the sea ice that survives the summer melt season. Perennial ice may have a life-span of nine years or more and represents the thickest component of the sea ice; perennial ice can grow up to four meters thick. By contrast, first year ice that grows during a single winter is generally at most two meters thick. Note that data for the sea ice age is not available along the coastlines. The region where data is not available is shown in a dark lavender color. Another version of this visualization includes a graph that quantifies the area covered by sea ice 4 or more years old in millions of square kilometers. See https://svs.gsfc.nasa.gov/4750 . Visualizers: Cindy Starr (lead), Horace Mitchell For more information or to download this public domain video, go to https://svs.gsfc.nasa.gov/4750#27895

Source : https://commons.wikimedia.org/wiki/File:NASA-WeeklyArcticSeaIceAge-1984-2019.webm — NASA Scientific Visualization Studio — licence domaine public.

Secretary Perdue and Senator Cornyn at Houston Food Bank (20200716-OSEC-LSC-0002)

Sciences et technologies — Thu, 03 Sep 2026 15:27:40 GMT

U.S. Department of Agriculture (USDA) Secretary Sonny Perdue (blue/green gingham shirt and tan mask) and Senator John Cornyn blue gingham shirt and blue bandana mask) tour the Houston Food Bank, one of USDA’s partners in the Houston area helping feed Americans in need through various nutrition programs administered by the USDA Food, including USDA Food and Nutrition Service (FNS); additionally the USDA Agricultural Marketing Service (AMS) Farmers to Families Food Box Program has distributed nearly 40 million food boxes in support of American farmers and families affected by the COVID-19 pandemic, on July 16, 2020, in Houston, TX. Houston Food Bank CEO Brian Green (black shirt and cap) and Chief Impact Officer Nicole Lander (red dress) lead them on a tour of the warehouse operations that include kitting (boxing and bagging) of food commodities by volunteers and servicemen of the Texas National Guard, and meal service preparation for after school food programs in the Keegan Kitchen. USDA FNS Southwest Regional Administrator Bill Ludwig (black coat and jeans) provided food program information. For more information about Food and Nutrition Service (FNS) Programs, please see fns.usda.gov/programs. For more information about the Agricultural Marketing Service (AMS) Farmers to Families Food Box Program, please see ams.usda.gov/selling-food-to-usda/farmers-to-families-food-box For additional information and photos please see the album and its description: https://www.flickr.com/short_urls.gne?photoset=aHsmPrMeRs https://www.flickr.com/short_urls.gne?photoset=aHsm5Pqo6f USDA Photo by Lance Cheung.

Source : https://commons.wikimedia.org/wiki/File:Secretary_Perdue_and_Senator_Cornyn_at_Houston_Food_Bank_(20200716-OSEC-LSC-0002).webm — USDAgov — licence domaine public.

Draining the Oceans video by NASA

Sciences et technologies — Thu, 03 Sep 2026 14:32:54 GMT

Remake of an animation NASA made back in 2008, but at high resolution and with edited timing ( https://svs.gsfc.nasa.gov/3487 ), the previous version was 1024x512 while this one is 3840x2160 (4K). From https://svs.gsfc.nasa.gov/3487 : Three fifths of the Earth's surface is under the ocean, and the ocean floor is as rich in detail as the land surface with which we are familiar. This animation simulates a drop in sea level that gradually reveals this detail. As the sea level drops, the continental shelves appear immediately. They are mostly visible by a depth of 140 meters, except for the Arctic and Antarctic regions, where the shelves are deeper. The mid-ocean ridges start to appear at a depth of 2000 to 3000 meters. By 6000 meters, most of the ocean is drained except for the deep ocean trenches, the deepest of which is the Marianas Trench at a depth of 10,911 meters. Credit for files used: Lead animator: Horace Mitchell (NASA) NASA/Goddard Space Flight Center Scientific Visualization Studio U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geophysical Data Center, 2006, 2-minute Gridded Global Relief Data (ETOPO2v2) - https://www.ngdc.noaa.gov/mgg/fliers/06mgg01.html . The Blue Marble Next Generation data is courtesy of Reto Stockli (NASA/GSFC) and NASA's Earth Observatory.

Source : https://commons.wikimedia.org/wiki/File:Draining_the_Oceans_video_by_NASA.webm — NASA/GFSC/Horace Mitchell & James O'Donoghue — licence CC BY.