As part of the Earth System Science Pathfinder small-satellite program, NASA has selected a new space mission proposal led by NASAs Goddard Space Flight Center in Greenbelt, Md., that will yield fresh insight into how oceans affect and respond to climate change -- knowledge that will help better life here on Earth. The mission, named Aquarius, promises to explore the saltiness of the seas in order to understand how the massive natural exchanges of water between the ocean, atmosphere and sea ice influence the ocean circulation, our climate, and our weather.
"Aquarius will provide the first-ever global maps of salt concentration on the ocean surface, a key area of scientific uncertainty in the oceans capacity to store and transport heat, which in turn affects Earths climate and the water cycle," said Dr. Ghassem Asrar, Associate Administrator for Earth Science at NASA Headquarters, Washington.
The Aquarius mission will be led by principal investigator Dr. Chester J. Koblinsky of Goddard. Goddard will build and calibrate the highly accurate radiometers that are crucial for the detection of ocean salinity and will manage the mission after launch and provide the science data center. The project is managed by NASAs Jet Propulsion Laboratory, Pasadena, Calif.
NASA will partner with the Argentine space program on the Aquarius mission, building on a successful long- standing relationship between NASA and Argentina. In all, over 17 universities and corporate and international partners will be involved in the Aquarius mission.
Aquarius is named after the Water Bearer constellation, because of its objective to explore the role of the water cycle in ocean circulation and climate. Aquarius will launch in 2007 and will orbit the Earth for at least three years, repeating its global pattern every 8 days. Within two months, Aquarius will collect as many sea surface salinity measurements as the entire 125-year historical record from ships and buoys, and provide the first measurements over the 25 percent of the ocean where no previous observations have been made.
"About 80 percent of atmosphere-water exchange occurs over the oceans," says Koblinsky. "These exchanges are important to weather and climate prediction, but are poorly understood."
According to Koblinsky, patterns of ocean surface salt concentration result from many factors: fresh water exchange between the ocean and the atmosphere (evaporation or precipitation), input from rivers and ground water, melting and freezing of polar ice, ocean currents and mixing.
"Global salinity measurements will allow us to closely monitor these processes for the first time, he says. "Global observations of sea surface salinity will also advance our understanding of ocean circulation and, perhaps, allow us to minimize the impacts of large-scale natural events in the future."
Because fresh water is light and floats on the surface, while salty water is heavy and sinks, Koblinsky says changes in salt concentration at the ocean surface affect the weight of surface waters. At high latitudes, melting sea ice, increased precipitation, and/or river inputs will make surface waters less salty.
"This density change could diminish the overturning ocean circulation, which brings warm water poleward on the surface to replace the sinking water," he says. "This would restrict the ocean-atmosphere heat pump that normally warms the atmosphere, leading to possible dramatic changes in climate."
In the tropics, increased precipitation can lead to fresh surface layers on the ocean, which heat up, and modify the energy exchange with the atmosphere, affecting El Nino and Monsoon processes.
NASA will fund up to $175 million for each of the two selected missions. The selected missions will have approximately nine months to refine their proposals to mitigate risk before mission development is fully underway.
NASA issued an Announcement of Opportunity and initially received 18 proposals, six of which were selected for detailed assessment, with two now moving on toward final implementation.
NASA conducts Earth science research to better understand and protect our home planet. Through the examination of Earth, we are developing the technologies and scientific knowledge needed to explore the universe while bettering life on our home planet.
Cynthia O’Carroll | EurekAlert
Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie
Modeling magma to find copper
13.01.2017 | Université de Genève
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
18.01.2017 | Power and Electrical Engineering
18.01.2017 | Materials Sciences
18.01.2017 | Life Sciences