Slashdot Mirror


NASA's Greenhouse Gas Observatory Captures 'First Light'

mdsolar (1045926) writes with news that NASA's second attempt to launch a satellite to map carbon dioxide levels across the globe succeeded, and its instruments are operating properly. From the article: NASA's first spacecraft dedicated to studying Earth's atmospheric climate changing carbon dioxide levels and its carbon cycle has reached its final observing orbit and taken its first science measurements as the leader of the world's first constellation of Earth science satellites known as the International 'A-Train. The Orbiting Carbon Observatory-2 (OCO-2) is a research satellite tasked with collecting the first global measurements of atmospheric carbon dioxide (CO2) — the leading human-produced greenhouse gas and the principal human-produced driver of climate change. The 'first light' measurements were conducted on Aug. 6 as the observatory flew over central Papua New Guinea and confirmed the health of the science instrument.

6 of 143 comments (clear)

  1. Re:fast forward 5 years.... by bunratty · · Score: 4, Informative

    I don't think it's climatologists who are the ones dismissing results they don't want. Actually, everyone would love to see that carbon dioxide emissions cause very little warming, but that's just not what the bulk of the data shows.

    --
    What a fool believes, he sees, no wise man has the power to reason away.
  2. Re:How is CO2 leading cause of warming? by gstoddart · · Score: 4, Informative

    If CO2 were a leading cause of warming, why would the temperatures not be spiking along with CO2 levels?

    You seem to be assuming it's linear and immediate, as opposed to being a complex system with built in lag and other factors -- which would boil down to "if I release X amount of CO2, tomorrow the temperature will go up by Y".

    It doesn't work that way, and is much more complex.

    Much like if you turn up your thermostat, your house isn't instantly warmer, because, thermodynamics.

    --
    Lost at C:>. Found at C.
  3. Re:How is CO2 leading cause of warming? by bunratty · · Score: 4, Interesting

    Most of the heat is going into the oceans and causing the sea level to rise due to thermal expansion. Much of the rest of the heat is continuing to melt the ice caps in the Arctic and Antarctic.

    --
    What a fool believes, he sees, no wise man has the power to reason away.
  4. Re:fast forward 5 years.... by bunratty · · Score: 3, Insightful

    This is exactly what I referred to above. When "skeptics" can't argue the issue, they dismiss the evidence they don't want by labeling it "propaganda". You can also take a look at my signature.

    --
    What a fool believes, he sees, no wise man has the power to reason away.
  5. Re:fast forward 5 years.... by mellon · · Score: 3, Insightful

    Yes, and really, really huge (many orders of magnitude bigger) amounts of profit would be lost by oil companies' shareholders if we decided to believe the absolutely overwhelming evidence that carbon dioxide causes global warming. Being a global warming scientist is a lot less lucrative than using those same skills to do just about anything else, so it's really hard to believe that job security is the motivational basis for roughly 99% of scientists who study climate change saying that we have a problem. Chances are that they just want to try to prevent their children seeing the last days of civilization and then dying painfully.

    The double irony is that a lot of climate change deniers are the same people who stockpile weapons in case of the collapse of civilization. It's almost as if you bloody well want to spend your last days futilely defending the dwindling supplies in your bunker.

  6. commissioning & Phase E by oneiros27 · · Score: 3, Informative

    The launch of the spacecraft is effectively the start of 'Phase E' (operations) for the instruments ... but there's a lot of things that still have to happen:

    • They have to deploy any solar panels (unless it's got an RTG), and align with the sun
    • They have to check out the spacecraft health, to make sure that nothing shook loose during launch, and they can talk to it.
    • The spacecraft has to get to the right place. (which takes *years* for missions to the outer planets)
    • They test the instruments against a known source (calibration lamp or similar)
    • They deploy antenna or instrument booms, remove covers, etc.
    • They take real measurements (aka. "first light")
    • They may perform maneuvers (eg, take an image, roll the spacecraft over, take an image again ... or take an exposure whole rolling) for flat fielding (aka. "calibration")
    • They compare the results from the new sensor against other measurements to determine how (aka. "validation")

    They refer to this whole period as "commissioning". They're not always run in order (eg, for the missions to the outer planets, which might take *years* to get to, they try to check on the health of the instruments before they get to the planet). For some instruments, it might take years to validate the data.

    There's also typically a press conference with the "first release" of the data, after the first calibration is done, but that's more to do with scientists on the ground than the spacecraft itself.

    disclaimer : I work for a NASA center, but I don't deal with spacecraft directly; I just manage the data after it's downlinked & processed.

    --
    Build it, and they will come^Hplain.