National CO2 budgets (2015–2020) inferred from atmospheric CO2 observations in support of the Global Stocktake

• DOI: 10.5194/essd-2022-213
• Publication Date: 2022-07-12T06:15:10Z
• Authors: Brendan Byrne; David F. Baker; Sourish Basu; Michael Bertolacci; Kevin W. Bowman; Dustin Carroll; Abhishek Chatterjee; Frédéric Chevallier; Philippe Ciais; Noel Cressie; David Crisp; Sean Crowell; Feng Deng; Zhu Deng; Nicholas M. Deuts...; Manvendra Dubey; Sha Feng; Omaira García; David W. T. Griffith; Benedikt Herkommer; Lei Hu; Andrew R. Jacobson; Rajesh Janardanan; Sujong Jeong; Matthew S. Johnson; Dylan B. A. Jones; Rigel Kivi; Junjie Liu; Zhiqiang Liu; Shamil Maksyutov; John B. Miller; Scot M. Miller; Isamu Morino; Justus Notholt; Tomohiro Oda; Christopher W. O’...; Young-Suk Oh; Hirofumi Ohyama; Prabir K. Patra; Hélène Peiro; Christof Petri; Sajeev Philip; David F. Pollard; Benjamin Poulter; Marine Remaud; Andrew Schuh; Mahesh K. Sha; Kei Shiomi; Kimberly Strong; Colm Sweeney; Yao Té; Hanqin Tian; Voltaire A. Velazco; Mihalis Vrekoussis; Thorsten Warneke; John R. Worden; Debra Wunch; Yuanzhi Yao; Jeongmin Yun; Andrew Zammit-Man...; Ning Zeng
• Keywords: Terrestrial ecosystem; Stock (firearms)

Abstract. Accurate accounting of emissions and removals CO2 is critical for the planning verification emission reduction targets in support Paris Agreement. Here, we present a pilot dataset country-specific net carbon exchange (NCE; fossil plus terrestrial ecosystem fluxes) stock changes aimed at informing countries’ budgets. These estimates are based on "top-down" NCE outputs from v10 Orbiting Carbon Observatory (OCO-2) modeling intercomparison project (MIP), wherein an ensemble inverse groups conducted standardized experiments assimilating OCO-2 column-averaged dry-air mole fraction (XCO2) retrievals (ACOS v10), situ measurements, or combinations these data. The MIP combined with "bottom-up" fuel lateral fluxes to estimate stocks, which impacted by anthropogenic natural drivers. flux change reported annually (2015–2020) as both global 1° × gridded country-level dataset. Across experiments, obtain increases median stocks 3.29–4.58 PgCO2 yr-1 (0.90–1.25 PgC yr-1). This result broad across northern extratropics, while tropics generally have losses but considerable regional variability differences between experiments. We discuss state science tracking using top-down methods, including current limitations future developments towards monitoring systems.