GNU social JP
  • FAQ
  • Login
GNU social JPは日本のGNU socialサーバーです。
Usage/ToS/admin/test/Pleroma FE
  • Public

    • Public
    • Network
    • Groups
    • Featured
    • Popular
    • People

Conversation

Notices

  1. Embed this notice
    Keith D Johnson (keithdjohnson@sfba.social)'s status on Saturday, 20-Jul-2024 07:18:54 JST Keith D Johnson Keith D Johnson

    "A paper from Cornell by #climate scientists that showed that in 2023 the ability of plants and #soils to absorb #carbon basically dropped to almost nothing. The Tropics were so hot & so dry that they are net emitters & the northern latitudes capacity dropped by *50%*.
    The implications are three fold.
    1. IPCC models did not predict this until much, much later which means they are assuming that the soil and trees will be absorbing carbon that won't be absorbed. Yet again, the IPCC models are wildly understating the impacts of climate change.
    2. In 2022, the oceans absorbed MORE carbon than usual, which may (this is speculative) explain why they are warming so fast - & it is possibly because they also are hitting absorption limits.
    3. Unless something changes there is no reason to believe we are not going to experience runaway global warming, & probably are already experiencing it."
    https://arxiv.org/abs/2407.12447?

    In conversation about 11 months ago from sfba.social permalink

    Attachments

    1. Domain not in remote thumbnail source whitelist: arxiv.org
      Low latency carbon budget analysis reveals a large decline of the land carbon sink in 2023
      In 2023, the CO2 growth rate was 3.37 +/- 0.11 ppm at Mauna Loa, 86% above the previous year, and hitting a record high since observations began in 1958, while global fossil fuel CO2 emissions only increased by 0.6 +/- 0.5%. This implies an unprecedented weakening of land and ocean sinks, and raises the question of where and why this reduction happened. Here we show a global net land CO2 sink of 0.44 +/- 0.21 GtC yr-1, the weakest since 2003. We used dynamic global vegetation models, satellites fire emissions, an atmospheric inversion based on OCO-2 measurements, and emulators of ocean biogeochemical and data driven models to deliver a fast-track carbon budget in 2023. Those models ensured consistency with previous carbon budgets. Regional flux anomalies from 2015-2022 are consistent between top-down and bottom-up approaches, with the largest abnormal carbon loss in the Amazon during the drought in the second half of 2023 (0.31 +/- 0.19 GtC yr-1), extreme fire emissions of 0.58 +/- 0.10 GtC yr-1 in Canada and a loss in South-East Asia (0.13 +/- 0.12 GtC yr-1). Since 2015, land CO2 uptake north of 20 degree N declined by half to 1.13 +/- 0.24 GtC yr-1 in 2023. Meanwhile, the tropics recovered from the 2015-16 El Nino carbon loss, gained carbon during the La Nina years (2020-2023), then switched to a carbon loss during the 2023 El Nino (0.56 +/- 0.23 GtC yr-1). The ocean sink was stronger than normal in the equatorial eastern Pacific due to reduced upwelling from La Nina's retreat in early 2023 and the development of El Nino later. Land regions exposed to extreme heat in 2023 contributed a gross carbon loss of 1.73 GtC yr-1, indicating that record warming in 2023 had a strong negative impact on the capacity of terrestrial ecosystems to mitigate climate change.

    Feeds

    • Activity Streams
    • RSS 2.0
    • Atom
    • Help
    • About
    • FAQ
    • TOS
    • Privacy
    • Source
    • Version
    • Contact

    GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.

    Creative Commons Attribution 3.0 All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.