The size of the land carbon sink in China

Abstract

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Forest expansion dominates China’s land carbon sink since 1980

“…A recent atmospheric inversion-based study reported that China’s land ecosystems were a large CO 2 sink of −1.11 ± 0.38 Pg C per year 27 , which seems to be ecologically implausible and critically sensitive to the assimilation of the CO 2 record from one station 28 . The compilation of previous studies from inventory- and satellite-based estimation, atmospheric inversion, and process-based models suggested that the Chinese C sink was much smaller (−0.18– −0.45 Pg C per year; Table 1 ).…”

“…Earlier assessments of the LUCC impact differed among regions, time periods, and biomes [12][13][14] . For example, LUCC-induced cumulative C emission in China may differ by a factor of three to five according to different studies (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33) Pg C vs 6.18 Pg C from 1700 to 2000) based on similar bookkeeping models 12,14 . Such discrepancies mainly stem from the use of different LUCC data 14 .…”

Biophysical and economic constraints on China’s natural climate solutions

“…1a), counterbalancing 8% of the mean annual fossil CO 2 emissions in the same period (7.5 PgCO 2 yr −1 ), in which the increased carbon sequestration from ecosystems (0.5 PgCO 2 yr −1 , excluding CH 4 and N 2 O) is about 54% (28-80%) of the overall land carbon sink in China (0.18-0.51 PgC yr −1 ) (ref. 10 ). During 2020-2030, the maximum potential of NCS (MAMP) of the 16 pathways is projected at 0.6 (0.3-1.0) PgCO 2 e yr −1 (Fig.…”

“…Climate and Atmosphere Research Center (CARE-C), The Cyprus Institute, Nicosia, Cyprus. 10 Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK. ✉ e-mail: bfu@rcees.ac.cn N atural climate solutions (NCS), a suite of land-management options including protecting, restoring and sustainably managing ecosystems 1 , provide readily implementable approaches to sequester carbon in terrestrial pools and/or reduce GHG emissions 2 .…”

Anthropogenic CO2 emission reduction during the COVID-19 pandemic in Nanchang City, China

“…As mentioned above, most atmospheric inversion studies use midday CO 2 observations to constrain local anthropogenic CO 2 emissions because the midday PBL is typically well-mixed compared to at night. Further, the aggregation (or representation) error is also minimum at midday than at night with stable nocturnal conditions ( Wang et al, 2022 ). Because the transport uncertainty is relatively small compared to that at night we have used the midday observations to constrain CO 2 emissions (see highlighted bold lines in Fig.…”