World Video | Defence | Foreign Affairs | Natural Events | Trade | NZ in World News | NZ National News Video | NZ Regional News | Search

 


NASA Carbon Counter Reaches Final Orbit, Returns Data

NASA Carbon Counter Reaches Final Orbit, Returns Data

August 11, 2014

Just over a month after launch, the Orbiting Carbon Observatory-2 (OCO-2) -- NASA's first spacecraft dedicated to studying atmospheric carbon dioxide -- has maneuvered into its final operating orbit and produced its first science data, confirming the health of its science instrument.

Atmospheric carbon dioxide is the leading human-produced greenhouse gas responsible for warming our world. It is a critical natural component of Earth's carbon cycle. OCO-2 will produce the most detailed picture to date of sources of carbon dioxide, as well as their natural "sinks" -- places on Earth's surface where carbon dioxide is removed from the atmosphere. The observatory will study how these sources and sinks are distributed around the globe and how they change over time.

Following launch from California's Vandenberg Air Force Base on July 2, OCO-2 underwent a series of steps to configure the observatory for in-flight operations. Mission controllers established two-way communications with the observatory, stabilized its orientation in space and deployed its solar arrays to provide electrical power. The OCO-2 team then performed a checkout of OCO-2's systems to ensure they were functioning properly.

Through the month of July, a series of propulsive burns was executed to maneuver the observatory into its final 438-mile (705-kilometer), near-polar orbit at the head of the international Afternoon Constellation, or "A-Train," of Earth-observing satellites. It arrived there on Aug. 3. Operations are now being conducted with the observatory in an orbit that crosses the equator at 1:36 p.m. local time.

The A-Train, the first multi-satellite, formation-flying "super observatory" to record the health of Earth's atmosphere and surface environment, collects an unprecedented quantity of nearly simultaneous climate and weather measurements. OCO-2 is now followed by the Japanese GCOM-W1 satellite, and then by NASA's Aqua, CALIPSO, CloudSat and Aura spacecraft, respectively -- all of which fly over the same point on Earth within 16 minutes of each other.

With OCO-2 in its final orbit, mission controllers began cooling the observatory's three-spectrometer instrument to its operating temperatures. The spectrometer's optical components must be cooled to near 21 degrees Fahrenheit (minus 6 degrees Celsius) to bring them into focus and limit the amount of heat they radiate. The instrument's detectors must be even cooler, near minus 243 degrees Fahrenheit (minus 153 degrees Celsius), to maximize their sensitivity.

With the instrument's optical system and detectors near their stable operating temperatures, the OCO-2 team collected "first light" test data on Aug. 6 as the observatory flew over central Papua New Guinea. The data were transmitted from OCO-2 to a ground station in Alaska, then to NASA's Goddard Space Flight Center in Greenbelt, Maryland, for initial decoding, and then to NASA's Jet Propulsion Laboratory in Pasadena, California, for further processing. The test provided the OCO-2 team with its first opportunity to see whether the instrument had reached orbit with the same performance it had demonstrated before launch.

As OCO-2 flies over Earth's sunlit hemisphere, each spectrometer collects a "frame" three times each second, for a total of about 9,000 frames from each orbit. Each frame is divided into eight spectra, or chemical signatures, that record the amount of molecular oxygen or carbon dioxide over adjacent ground footprints. Each footprint is about 1.3 miles (2.25 kilometers) long and a few hundred yards (meters) wide. When displayed as an image, the eight spectra appear like bar codes -- bright bands of light broken by sharp dark lines. The dark lines indicate absorption by molecular oxygen or carbon dioxide.

"The initial data from OCO-2 appear exactly as expected -- the spectral lines are well resolved, sharp and deep," said OCO-2 chief architect and calibration lead Randy Pollock of JPL. "We still have a lot of work to do to go from having a working instrument to having a well-calibrated and scientifically useful instrument, but this was an important milestone on this journey."

Over the next several weeks, the OCO-2 team will conduct a series of calibration activities to characterize fully the performance of the instrument and observatory. In parallel, OCO-2 will routinely record and return up to 1 million science observations each day. These data will be used initially to test the ground processing system and verify its products. The team will begin delivering calibrated OCO-2 spectra data to NASA's Goddard Earth Sciences Data and Information Services Center for distribution to the global science community and other interested parties before the end of the year. The team will also deliver estimates of carbon dioxide to that same center for distribution in early 2015.

OCO-2 is a NASA Earth System Science Pathfinder Program mission managed by JPL for NASA's Science Mission Directorate in Washington. Orbital Sciences Corporation in Dulles, Virginia, built the spacecraft bus 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, California. NASA's Launch Services Program at NASA's Kennedy Space Center in Florida was responsible for launch management.

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.

ENDS

© Scoop Media

 
 
 
 
 
World Headlines

 

Amnesty: Campaign Mass Hangings And Extermination At Syrian Prison

A chilling new report by Amnesty International exposes the Syrian government’s calculated campaign of extrajudicial executions by mass hangings at Saydnaya Prison. Between 2011 and 2015, every week and often twice a week, groups of up to 50 people ... More>>

Russian Hack Job?: White House - Actions In Response To Russian Malicious Cyber Activity & Harassment

President Obama authorized a number of actions in response to the Russian government’s aggressive harassment of U.S. officials and cyber operations aimed at the U.S. election in 2016. More>>


Israel/Palestine: Michael Field - Background To How Israel Nearly Went To War With New Zealand

New Zealand and Senegal managed to get the United Nations Security Council to pass resolution 2334 which said Israel’s settlements in Palestinian territory violate international law and undermine a two-state solution in Israel's conflict with Palestine. More>>

ALSO:

US Indigenous Affairs: How President Obama Has Protected Our Sacred Land

I am very proud to be both Navajo and American. As the President of the Navajo Nation, I’ve dedicated my life to ensuring that, as a Navajo, my story -- and our stories -- are part of our collective American history. Today, I want to share one of those stories with you. More>>


Binoy Kampmark: The Berlin Truck Attack And The Refugee Question

The hard-nosed neo-cons were certainly showing little interest in linking arguments, examining evidence, or even considering elementary logic in the aftermath of the Berlin truck attack near the Gedächtniskirche. With the bodies fresh in the morgue, former US ambassador to the United Nations, John Bolton, peered into the mind of the everyday German, and found teeth chattering fear. More>>

Demonetisation: Gordon Campbell On India’s Huge Socio-Economic Experiment

Without much coverage at all in the West, India has just been engaged for the past few weeks in one of the world’s biggest socio-economic experiments since the Cultural Revolution in China. More>>

Gordon Campbell: On The Death Of Fidel Castro

New Zealand likes to think we played our part – via the 1981 Springbok tour – in bringing the apartheid regime in South Africa to an end… Jacob Zuma treated the death of Fidel Castro at the weekend as an occasion to pay a heartfelt tribute to the thousands of Cuban soldiers who travelled across the world to inflict the first significant military defeat on the forces of white supremacy. More>>

ALSO:

Get More From Scoop

 
 
 
 
World
Search Scoop  
 
 
Powered by Vodafone
NZ independent news