Canadian land cover map / study areas
The BOREAS-follow on Project to determine how carbon storage in boreal forests change in response to wildfire was set in the northern edge of the Canadian boreal forest in Manitoba, Canada, the former Northern Study Area (NSA) in Thompson Manitoba from BOREAS. CREDIT: Canadian Model Forest Program
Northern study area
This satellite image of the Northern Study Area, Manitoba, Canada was taken by the Landsat satellite on July 25, 1990. The bodies of water can be seen in blue. The landscape is a mosaic of different aged stands that are in various stages of recovery from wildfire. Each of the colored patches corresponds to a different aged stand. The years corresponding to the areas indicate the last year of forest fire. CREDIT: NASA/USGS
Scientists studying trees ranging from saplings to 130 years old in Canada’s northern forests have discovered that the period since a fire last swept through an area determines how much carbon the forest can store. Twenty to forty year old stands absorb more carbon than those 70 years old and older, despite being smaller and having less biomass or plant material.
Boreal or northern forests account for close to 25 percent of total carbon stored in vegetation and soils in the Earth’s biosphere. Wildfires burn down individual areas every 40 to 250 years and are an important part of this ecosystem. Whether or not these forests are likely to lower or raise levels of carbon dioxide in the atmosphere depends on how these carbon reserves respond to, and recover from, both climate change and disturbances such as wildfires.
NASA funded part of this study under its Earth Science Enterprise (ESE), whose mission is to understand and protect our home planet. Earth Science in NASA seeks to understand trends in land cover and land use, such as forest fires, that drive global climate. Another Earth Science program objective is to understand the Earth system’s response to natural and human-induced changes, and effects on global carbon cycle.
Rob Gutro | NASA / Goddard Space Flight Cent
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15.09.2017 | Justus-Liebig-Universität Gießen
A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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