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Global CO2 emissions from dry inland waters share common drivers across ecosystems.

ABSTRACT: Many inland waters exhibit complete or partial desiccation, or have vanished due to global change, exposing sediments to the atmosphere. Yet, data on carbon dioxide (CO2) emissions from these sediments are too scarce to upscale emissions for global estimates or to understand their fundamental drivers. Here, we present the results of a global survey covering 196 dry inland waters across diverse ecosystem types and climate zones. We show that their CO2 emissions share fundamental drivers and constitute a substantial fraction of the carbon cycled by inland waters. CO2 emissions were consistent across ecosystem types and climate zones, with local characteristics explaining much of the variability. Accounting for such emissions increases global estimates of carbon emissions from inland waters by 6% (~0.12 Pg C y-1). Our results indicate that emissions from dry inland waters represent a significant and likely increasing component of the inland waters carbon cycle.

SUBMITTER: Keller PS

PROVIDER: S-EPMC7195363 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Global CO2 emissions from dry inland waters share common drivers across ecosystems.

Keller P S PS Catalán N N von Schiller D D Grossart H-P HP Koschorreck M M Obrador B B Frassl M A MA Karakaya N N Barros N N Howitt J A JA Mendoza-Lera C C Pastor A A Flaim G G Aben R R Riis T T Arce M I MI Onandia G G Paranaíba J R JR Linkhorst A A Del Campo R R Amado A M AM Cauvy-Fraunié S S Brothers S S Condon J J Mendonça R F RF Reverey F F Rõõm E-I EI Datry T T Roland F F Laas A A Obertegger U U Park J-H JH Wang H H Kosten S S Gómez R R Feijoó C C Elosegi A A Sánchez-Montoya M M MM Finlayson C M CM Melita M M Oliveira Junior E S ES Muniz C C CC Gómez-Gener L L Leigh C C Zhang Q Q Marcé R R

Nature communications 20200501 1

Many inland waters exhibit complete or partial desiccation, or have vanished due to global change, exposing sediments to the atmosphere. Yet, data on carbon dioxide (CO2) emissions from these sediments are too scarce to upscale emissions for global estimates or to understand their fundamental drivers. Here, we present the results of a global survey covering 196 dry inland waters across diverse ecosystem types and climate zones. We show that their CO2 emissions share fundame ...[more]

PMID: 32358532

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Project description:China is the largest CO2 emitter in the world and announced that carbon peak and neutral targets will be achieved before 2030 and 2060, respectively. A retrospective analysis of past CO2 emissions and their drivers is important for the actions of peaking CO2 emissions before 2030 in China. CO2 emissions from energy use (coal, oil, and natural gas) and cement production from 2000 to 2020 were calculated first, and their drivers were decomposed into economic and population growth, energy intensity, and emission coefficient by logarithmic mean Divisa index (LMDI) analysis in this study. China’s CO2 emissions increased nearly threefold from 3385 in 2000 to 10,788 million tonnes (Mt) in 2020, with a decline from 2013 to 2016. Coal was the major emission sector contributing more than 70% in most years, while natural gas emissions increased nearly 13 times from 53 to 723 Mt in the two decades, although its contribution only accounted for 6.7% in 2020. Economic growth was the major positive driver, while energy intensity reduction was the major negative driver of the emission increments by year and by the Five Year Plan (FYP). Emission coefficient reduction gradually became important due to its negative effect, especially in the 13th FYP, which offset ~ 30% of the emissions induced by economic growth. The projections of CO2 emissions in 2025, 2030, and 2035 could be 11,596 ± 582, 11,774 ± 621, and 11,401 ± 672 Mt, respectively, suggesting that China’s carbon emissions could peak around 2030 with an increment of ~ 1000 Mt on the 2020 levels. Under the sustainable growth of the economy and population, it is possible to reduce the carbon peak value or achieve peak time earlier through the additional reduction of energy intensity and emission coefficient by technological progress and energy alternatives such as non-fossil fuels. Graphical Abstract Supplementary Information The online version contains supplementary material available at 10.1007/s10668-022-02811-8.

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Global CO2 emissions from dry inland waters share common drivers across ecosystems.

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Global CO<sub>2</sub> emissions from dry inland waters share common drivers across ecosystems.

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