Net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming
Melillo, Jerry M.
MetadataShow full item record
China's terrestrial ecosystems have been recognized as an atmospheric CO2 sink; however, it is uncertain whether this sink can alleviate global warming given the fluxes of CH4 and N2O. In this study, we used a process-based ecosystem model driven by multiple environmental factors to examine the net warming potential resulting from net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere during 1961–2005. In the past 45 years, China's terrestrial ecosystems were found to sequestrate CO2 at a rate of 179.3 Tg C yr−1 with a 95% confidence range of (62.0 Tg C yr−1, 264.9 Tg C yr−1) while emitting CH4 and N2O at rates of 8.3 Tg C yr−1 with a 95% confidence range of (3.3 Tg C yr−1, 12.4 Tg C yr−1) and 0.6 Tg N yr−1 with a 95% confidence range of (0.2 Tg N yr−1, 1.1 Tg N yr−1), respectively. When translated into global warming potential, it is highly possible that China's terrestrial ecosystems mitigated global climate warming at a rate of 96.9 Tg CO2eq yr−1 (1 Tg = 1012 g), substantially varying from a source of 766.8 Tg CO2eq yr−1 in 1997 to a sink of 705.2 Tg CO2eq yr−1 in 2002. The southeast and northeast of China slightly contributed to global climate warming; while the northwest, north, and southwest of China imposed cooling effects on the climate system. Paddy land, followed by natural wetland and dry cropland, was the largest contributor to national warming potential; forest, followed by woodland and grassland, played the most significant role in alleviating climate warming. Our simulated results indicate that CH4 and N2O emissions offset approximately 84.8% of terrestrial CO2 sink in China during 1961–2005. This study suggests that the relieving effects of China's terrestrial ecosystems on climate warming through sequestering CO2 might be gradually offset by increasing N2O emission, in combination with CH4 emission.
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): G02011, doi:10.1029/2010JG001393.
Suggested CitationArticle: Tian, Hanqin, Xu, Xiaofeng, Lu, Chaoqun, Liu, Mingliang, Ren, Wei, Chen, Guangsheng, Melillo, Jerry M., Liu, Jiyuan, "Net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming", Journal of Geophysical Research 116 (2011): G02011, DOI:10.1029/2010JG001393, https://hdl.handle.net/1912/4633
Showing items related by title, author, creator and subject.
Tian, Hanqin; Melillo, Jerry M.; Lu, Chaoqun; Kicklighter, David W.; Liu, Mingliang; Ren, Wei; Xu, Xiaofeng; Chen, Guangsheng; Zhang, Chi; Pan, Shufen; Liu, Jiyuan; Running, Steven W. (American Geophysical Union, 2011-03-31)The magnitude, spatial, and temporal patterns of the terrestrial carbon sink and the underlying mechanisms remain uncertain and need to be investigated. China is important in determining the global carbon balance in terms ...
Cai, Wenju; Avery, Susan K.; Leinen, Margaret S.; Lee, Kenneth; Lin, Xiaopei; Visbeck, Martin (2014-11)A sustainable global ocean observation system requires timely implementation of a global ocean observation framework. The recent Qingdao Global Ocean Summit offers an effective mechanism for a coherent institutional response ...
Salinification in the South China Sea since late 2012 : a reversal of the freshening since the 1990s Zeng, Lili; Chassignet, Eric P.; Schmitt, Raymond W.; Xu, Xiaobiao; Wang, Dongxiao (John Wiley & Sons, 2018-03-05)Salinification has occurred in the South China Sea from late 2012 to the present, as shown by satellite Aquarius/Soil Moisture Active Passive data and Argo float data. This salinification follows a 20 year freshening trend ...