老版博贝棋牌

  • LINE

    Text:AAAPrint
    Sci-tech

    NASA detects millions of Arctic methane hotspots

    1
    2020-02-14 19:15:52Xinhua Editor : Mo Hong'e ECNS App Download

    A new study by NASA scientists has found two million methane emission hotspots in the North American Arctic, according to a statement released by NASA's Jet Propulsion Laboratory (JPL) on Thursday.

    "We consider hotspots to be areas showing an excess of 3,000 parts per million of methane between the airborne sensor and the ground," said lead author Clayton Elder of JPL. "And we detected two million of these hotspots over the land that we covered."

    The paper, titled "Airborne Mapping Reveals Emergent Power Law of Arctic Methane Emissions," was published on Feb. 10 in the journal Geophysical Research Letters.

    Within the dataset, the team also discovered a pattern: On average, the methane hotspots were mostly concentrated within about 40 meters of standing bodies of water, such as lakes and streams. After the 40-meter mark, the presence of hotspots gradually became sparser, and at about 300 meters from the water source, they dropped off almost completely.

    The Arctic is one of the fastest warming places on the planet. As temperatures rise, the perpetually frozen layer of soil begins to thaw, releasing methane and other greenhouse gases into the atmosphere.

    These methane emissions can accelerate future warming, but to understand to what extent, scientists need to know how much methane may be emitted, as well as when and what environmental factors may influence its release, said JPL.

    "After two years of ground field studies that began in 2018 at an Alaskan lake site with a methane hotspot, we found abrupt thawing of the permafrost right underneath the hotspot," said Elder.

    Being able to identify the likely causes of the distribution of methane hotspots will help scientists more accurately calculate this greenhouse gas' emissions across unobserved areas, according to JPL.

    Related news

    MorePhoto

    Most popular in 24h

    MoreTop news

    MoreVideo

    LINE
    Back to top Links | About Us | Jobs | Contact Us | Privacy Policy
    Copyright ©1999-2020 Chinanews.com. All rights reserved.
    Reproduction in whole or in part without permission is prohibited.
  • oo8的彩

    球探比分足球即时比分007

    mg游戏平台官网

    网投网官网

    百姓彩票快三直接登

    澳门银河官网地址

    信发的彩的网登录

    鑫源彩票登录

    bg大游馆