Improved estimates of net ecosystem exchanges in mega-countries using GOSAT and OCO-2 observations

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Lingyu Zhang, Fei Jiang, Wei He, Mousong Wu, Jun Wang, Weimin Ju, Hengmao Wang, Yongguang Zhang, Stephen Sitch, Jing M. Chen
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Abstract

Accurate national terrestrial net ecosystem exchange estimates are crucial for the global stocktake. Net ecosystem exchange estimates from different inversion models vary greatly at national scale, and the relative impacts of prior fluxes and observations on these inversions remain unclear. Here we estimate the net ecosystem exchange of 51 land regions for the 2017-2019 period, focusing on the 10 largest countries, using prior fluxes from 12 terrestrial biosphere models and XCO2 retrievals from GOSAT and OCO-2 satellites as constraints. The average uncertainty reduction for the 10 countries increases from 37% with GOSAT and 45% with OCO-2 to 50% with combined observations, indicating a trend towards robust estimates. At finer spatial scales, even with combined observations, the uncertainty reduction is only 33%, i.e., the prior flux dominates the estimates. This finding underscores the critical importance of integrating multi-source observations and refining prior fluxes to improve the accuracy of carbon flux estimates. Choice of ecosystem model and input satellite data has a significant impact on modelled carbon dioxide flux and its associated uncertainty for large countries, according to atmospheric inversions using GOSAT and OCO-2 data.

Abstract Image

利用 GOSAT 和 OCO-2 观测数据改进对特大国家生态系统净交换的估算
准确的国家陆地净生态系统交换估算值对全球清查至关重要。在国家尺度上,不同反演模型得出的净生态系统交换估算值差异很大,而先前通量和观测数据对这些反演值的相对影响仍不清楚。在此,我们以 10 个最大的国家为重点,利用 12 个陆地生物圈模型的先验通量以及 GOSAT 和 OCO-2 卫星的 XCO2 检索结果作为约束条件,估算了 2017-2019 年期间 51 个陆地区域的净生态系统交换量。这 10 个国家的平均不确定性降低率从 GOSAT 卫星的 37% 和 OCO-2 卫星的 45% 增加到综合观测数据的 50%,表明了稳健估算的趋势。在更细的空间尺度上,即使采用综合观测,不确定性降低率也只有 33%,即先验通量在估算中占主导地位。这一发现强调了整合多源观测数据和完善先验通量对提高碳通量估算精度的重要性。利用 GOSAT 和 OCO-2 数据进行的大气反演表明,生态系统模型和输入卫星数据的选择对模拟的大国二氧化碳通量及其相关不确定性有重大影响。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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