Image Credit: NASA Earth Observatory image by Jesse Allen, using data from NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team.
March 5, 2016
Eruption at Momotombo– The Advanced Spaceborne Thermal Emission and Reflection Radiometer on NASA’s Terra Satellite aquired this false color image of Momotombo volcano in Nicaragua erupting on March 2, 2016.
March 16, 2016
Flooding in the U.S. South– The Moderate Imaging Spectroradiometer on NASA’s Terra Satellite captured images of the flooding waters on the Mississippi River and White River in the southern United States.
March 18, 2016
Sand Mining at Poyang Lake– As part of an effort to assess the scale of the sand mining and its environmental impacts, a group of researchers analyzed data collected by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor on NASA’s Terra satellite. Using infrared data collected by ASTER in 2005, the researchers found that the lake was producing up to 236 million cubic meters of sand per year—about 9 percent of the total produced by China. The researchers estimated that the volume of sand removed was probably enough to make Poyang Lake the largest sand mining operation in the world.
March 19, 2016
Northern California Floodway Fills– The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured images of the river and floodway in northern California. Storms in March 2016 brought water levels in this drought stricken region back to it’s historic average.
Image credit: NASA/GSFC/METI/ERSDAC/JAROS, and the U.S./Japan ASTER Science Team.
Terra and its sensors are back on line and collecting data. The ASTER team released this first light image. The area is in Queensland, Australia where the Elliott River meets the Pacific Ocean. To the south of the river is the Burrum Coast National Park, appearing deep red. The brighter red areas to the east of the National Park is farmland. North of the River is the small town of Elliott Heads with a population of less than 900 people.
The Terra Satellite is currently back in operation. MODIS, MISR and CERES are all collecting data. Terra’s international sensors, MOPITT and ASTER, will begin collecting data soon.
Global contribution of three climate variables to the vegetation sensitivity index from 2000–2013. Temperature is in red, water availability in blue and cloudiness in green. Areas with dominant barren land and permanent ice are grey. Image credit: Sensitivity of global terrestrial ecosystems to climate variability. Alistair W. R. Seddon, Marc Macias-Fauria, Peter R. Long, David Benz & Kathy J. Willis. Nature. (2016) doi:10.1038/nature16986
MODIS data from the past 14 years is being used to generate a model that assesses how different ecosystems respond to climate variability, making it possible to compare regional sensitivity and resilience. The new index is called the vegetation sensitivity index, which makes it possible to compare vulnerability of different regions, looking at why some areas are more vulnerable than others.
The new index is unique. Most studies about ecosystem resilience typically monitor productivity or biodiversity trends over an average climate, such as the normalized difference vegetation index (NDVI) or the enhanced vegetation index (EVI), which also uses MODIS data. This new index instead looks at response to climate variation.
Read the news article from Nature.
Read the journal article from Nature.