NASA : NASA's Carbon-Counting Spacecraft Arrives at Launch Site

A truck convoy carrying NASA’s Orbiting Carbon Observatory-2 spacecraft arrives at California’s Vandenberg Air Force Base on April 30. The observatory will undergo final tests in preparation for a planned July 1 launch.

Image Credit:

NASA/JPL-Caltech

A NASA spacecraft designed to make precise measurements of carbon dioxide in Earth’s atmosphere is at Vandenberg Air Force Base, Calif., to begin final preparations for launch.
The Orbiting Carbon Observatory-2 arrived Wednesday at its launch site on California's central coast after travelling from Orbital Sciences Corp.'s Satellite Manufacturing Facility in Gilbert, Ariz. The spacecraft now will undergo final tests and then be integrated on top of a United Launch Alliance Delta II rocket in preparation for a planned July 1 launch.
The observatory is NASA's first satellite mission dedicated to studying carbon dioxide, a critical component of Earth’s carbon cycle that is the leading human-produced greenhouse gas driving changes in Earth's climate. It replaces a nearly identical spacecraft lost due to a rocket launch mishap in February 2009.
OCO-2 will provide a new tool for understanding both the sources of carbon dioxide emissions and the natural processes that remove carbon dioxide from the atmosphere and how they are changing over time. Since the start of the Industrial Revolution more than 200 years ago, the burning of fossil fuels, as well as other human activities, have led to an unprecedented buildup in this greenhouse gas, which is now at its highest level in at least 800,000 years. Human activities have increased the level of carbon dioxide by more than 25 percent in just the past half century.
Greenhouse gases, such as carbon dioxide, trap the sun's heat within Earth's atmosphere, warming it and keeping it at habitable temperatures. However, scientists have concluded that increases in carbon dioxide resulting from human activities have thrown Earth's natural carbon cycle off balance, increasing global temperatures and changing the planet's climate.
While scientists understand carbon dioxide emissions resulting from burning fossil fuels and can estimate their quantity quite accurately, their understanding of carbon dioxide from other human-produced and natural sources is relatively less quantified. Atmospheric measurements collected at ground stations indicate less than half of the carbon dioxide humans emit into the atmosphere stays there. The rest is believed to be absorbed by the ocean and plants on land.
But the locations and identity of the natural "sinks" absorbing this carbon dioxide currently are not well understood. OCO-2 will help solve this critical scientific puzzle. Quantifying how the natural processes are helping remove carbon from the atmosphere will help scientists construct better models to predict how much carbon dioxide these sinks will be able to absorb in the future.
The mission’s innovative technologies will enable space-based measurements of atmospheric carbon dioxide with the sensitivity, resolution and coverage needed to characterize the sources of carbon dioxide emissions and the natural sinks that moderate their buildup, at regional scales, everywhere on Earth. The mission's data will help scientists reduce uncertainties in forecasts of how much carbon dioxide is in the atmosphere and improve the accuracy of global climate change predictions.
In addition to measuring carbon dioxide, OCO-2 will monitor the "glow" of the chlorophyll contained within plants, a phenomenon known as solar-induced chlorophyll fluorescence, opening up potential new applications for studying vegetation on land. NASA researchers, in collaboration with Japanese and other international colleagues, have discovered that data from Japan's GOSAT (Greenhouse gases observing SATellite, also known as Ibuki in Japan), along with other satellites, including OCO-2, can help monitor this “signature” of photosynthesis on a global scale.
The observatory will fly in a 438-mile (705-kilometer) altitude, near-polar orbit in formation with the five other satellites that are part of the Afternoon, or "A-Train" Constellation. This international constellation of Earth-observing satellites circles Earth once every 98 minutes in a sun-synchronous orbit that crosses the equator near 1:30 p.m. local time and repeats the same ground track every 16 days. OCO-2 will be inserted at the head of the A-Train. Once in this orbit, OCO-2 is designed to operate for at least two years. This coordinated flight formation will enable researchers to correlate OCO-2 data with data from other NASA and partner spacecraft.
OCO-2 is a NASA Earth System Science Pathfinder Program mission managed by NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif., for NASA's Science Mission Directorate in Washington. Orbital built the spacecraft and provides mission operations under JPL’s leadership. The science instrument was built by JPL, based on the instrument design co-developed for the original OCO mission by Hamilton Sundstrand in Pomona, Calif. NASA's Launch Services Program at NASA's Kennedy Space Center in Florida is responsible for launch management. JPL is managed for NASA by the California Institute of Technology in Pasadena.
For more information about the Orbiting Carbon Observatory-2, visit:

http://oco.jpl.nasa.gov

and

http://www.nasa.gov/oco-2

NASA monitors Earth’s vital signs from land, air and space with a fleet of satellites and ambitious airborne and ground-based observation campaigns. NASA develops new ways to observe and study Earth’s interconnected natural systems with long-term data records and computer analysis tools to better see how our planet is changing. The agency shares this unique knowledge with the global community and works with institutions in the United States and around the world that contribute to understanding and protecting our home planet. OCO-2 is the second of five NASA Earth science missions launched into space this year, the most new Earth-observing mission launches in the same year in more than a decade.
For more information about NASA's Earth science activities in 2014, visit:

http://www.nasa.gov/earthrightnow

NASA
Guillermo Gonzalo Sánchez Achutegui
ayabaca@gmail.com
ayabaca@hotmail.com
ayabaca@yahoo.com
Inscríbete en el Foro del blog y participa : A Vuelo De Un Quinde - El Foro!

NASA : NASA’s OCO-2 Brings Sharp New Focus on Global Carbon

Animated GIF Override:

This animation shows the Orbiting Carbon Observatory-2, the first NASA spacecraft dedicated to studying carbon dioxide in Earth’s atmosphere.

Image Credit:

NASA/JPL-Caltech

Five new NASA Earth science missions will join Landsat 8 in space this year to expand our understanding of Earth’s changing climate and environment.

Feature Link:

"Earth Right Now" website

Simply by breathing, humans have played a small part in the planet-wide balancing act called the carbon cycle throughout our existence. However, in the last few hundred years, we have taken a larger role. Our activities, such as fossil fuel burning and deforestation, are pushing the cycle out of its natural balance, adding more and more carbon dioxide to the atmosphere.

Natural processes are working hard to keep the carbon cycle in balance by absorbing about half of our carbon emissions, limiting the extent of climate change. There's a lot we don't know about these processes, including where they are occurring and how they might change as the climate warms. To understand and prepare for the carbon cycle of the future, we have an urgent need to find out.

In July 2014, NASA will launch the Orbiting Carbon Observatory-2 (OCO-2) to study the fate of carbon dioxide worldwide. "Right now, the land and the ocean are taking up almost half of the carbon dioxide we add to the atmosphere by burning fossil fuels, but the future is fundamentally unknown," said Paul Wennberg, a professor of atmospheric chemistry at the California Institute of Technology in Pasadena. "OCO-2 is a key to getting answers." The mission has been developed and is managed by NASA's Jet Propulsion Laboratory in Pasadena, Calif.

Carbon dioxide is both one of the best measured greenhouse gases and one of the least measured. The emissions that remain in the atmosphere become evenly distributed around the globe in a matter of months. As a result, the average atmospheric concentration can be monitored well by existing ground stations (about 160 worldwide). The other half of our emissions -- the half that is being absorbed through natural processes into the land or the ocean -- is not evenly distributed. To understand where that carbon dioxide is going, we need precise, comprehensive, ongoing data about carbon dioxide absorption and emission by forests, the ocean and many other regions. For some of these regions, we have far too few observations.

"A research ship moves about the speed of a 10-speed bicycle," said Scott Doney, director of the Ocean and Climate Change Institute at the Woods Hole Oceanographic Institution, Woods Hole, Mass. "Think about the size of the ocean. There's only so much research you can do at the speed of a bicycle." Oceanographers have made up some of the observational deficit by contracting with shipping lines to gather data along commercial routes. But there's little shipping in the Southern Ocean, and Doney said that's a region of high concern. "With warming, we expect big changes. The winds are changing there, and carbon dioxide uptake may change too."

On land, Earth's great forests might be the least understood areas. In northern Siberia, a region with no permanent settlements and few roads, there are only six year-round monitoring sites across seven time zones. Forests remove carbon from the air during photosynthesis and store it in wood and roots, making these forests what scientists call carbon sinks. But droughts and wildfires can turn forests into carbon sources, releasing the stored carbon back into the atmosphere. We don't know when and how often forests cross the line from sink to source.

OCO-2 will not be the first satellite to measure carbon dioxide, but it's the first with the observational strategy, precision, resolution and coverage needed to answer these questions about these little-monitored regions, according to Ralph Basilio, OCO-2 project manager at JPL.

OCO-2's scientific instrument uses spectrometers, which split sunlight into a spectrum of component colors, or wavelengths. Like all other molecules, carbon dioxide molecules absorb only certain colors of light, producing a unique pattern of dark features in the spectrum. The intensity of the dark features increases as the number of carbon dioxide molecules increases in the air that the spectrometer is looking through.

Carbon dioxide concentrations in the atmosphere are measured in parts per million, the number of molecules of carbon dioxide there are in every million molecules of air. That number is currently around 400. OCO-2's spectrometers can detect changes of one or two carbon dioxide molecules out of the 400 -- an unprecedented level of precision, and one that scientists think will be adequate to detect changes in natural sources and sinks, once enough measurements have been collected.

OCO-2 will collect 24 measurements a second over Earth’s sunlit hemisphere, totaling more than a million measurements each day. Fewer than 20 percent of these measurements will be sufficiently cloud-free to allow an accurate estimate of carbon dioxide, but that number will still yield 100 to 200 times as many measurements as the currently observing Japanese Greenhouse gases Observing SATellite (GOSAT) mission. The measurements will be used as input for global atmospheric models. Combined with data on winds and other conditions, the OCO-2 data will allow modelers to better locate carbon sources and sinks at regional scales -- areas the size of France or Texas.

"With atmospheric carbon dioxide at unprecedented levels, our sense of urgency has only increased,” said Basilio. “What will happen if we keep emitting carbon dioxide at the same rate? The ultimate goal for OCO-2 is to provide data so that organizations and individuals throughout the world can make better-informed decisions about carbon."

For more information about OCO-2, visit:

https://oco.jpl.nasa.gov

OCO-2 is one of five new NASA missions launching in 2014. NASA monitors Earth's vital signs from land, air and space with a fleet of satellites and ambitious airborne and ground-based observation campaigns. NASA develops new ways to observe and study Earth's interconnected natural systems with long-term data records and computer analysis tools to see better how our planet is changing. The agency shares this unique knowledge with the global community and works with institutions in the United States and around the world that contribute to understanding and protecting our home planet.

For more information about NASA's Earth science activities in 2014, visit:

http://www.nasa.gov/earthrightnow

NASA

Guillermo Gonzalo Sánchez Achutegui

ayabaca@gmail.com

ayabaca@hotmail.com

ayabaca@yahoo.com

Inscríbete en el Foro del blog y participa : A Vuelo De Un Quinde - El Foro!