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Implications for CO2 emissions and sinks changes in western China during 1995-2008 from atmospheric CO2 at Waliguan.
- Source :
- Tellus: Series B; 2013, Vol. 65, p1-N.PAG, 14p
- Publication Year :
- 2013
-
Abstract
- Carbon dioxide (CO<subscript>2</subscript>) emissions and sinks in western China are estimated and implied from atmospheric CO<subscript>2</subscript> measured at Waliguan during the period of 1995-2008. The observed CO<subscript>2</subscript> data are first classified as background, elevated, and sequestration, using a modified background identification method. Comparing it with two other methods tests the applicability of the method. By using this method, approximately 17.2%±1.2% and 10.1%±0.8% of all observed data are identified as elevated and sequestered CO<subscript>2</subscript>, respectively, the percentages (occurrence rates) for both of which increased during 1995-2008. CO<subscript>2</subscript> emissions in western China have enhanced significantly in all seasons during the past 14 yr. Annual mean growth rates of CO<subscript>2</subscript> emissions in the region increased by ~8.4 Tg C yr<superscript>-1</superscript> (3.9% yr<superscript>-1</superscript>) during 1995-2008 but accelerated after 2000 to ~12.6 TgC yr<superscript>-1</superscript> (6.2% yr<superscript>-1</superscript>). The growth rates of CO<subscript>2</subscript> emission in western China are lower than the rest of the country. The annual mean emissions in the country during 1995-1999 and 2000-2006 are thought to be approximately 5.5 and 6.5 times higher than in western China, respectively. However, the growth rates of CO<subscript>2</subscript> emissions in western China are higher than global increase rates as reported by other studies. CO<subscript>2</subscript> sinks in western China varied from 86.0 Tg C yr<superscript>-1</superscript> in early 1995-1999 to 106.2 Tg C yr<superscript>-1</superscript> in 2005-2008. The most prominent change occurs in summer, indicating enhanced sequestration of photosynthetic CO<subscript>2</subscript> taken up by vegetation. The growth rates in sequestered CO<subscript>2</subscript> cannot keep up with the increase of CO<subscript>2</subscript> emissions in the region. If this continues, it could potentially impact on the global carbon budget. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02806509
- Volume :
- 65
- Database :
- Complementary Index
- Journal :
- Tellus: Series B
- Publication Type :
- Academic Journal
- Accession number :
- 102585948
- Full Text :
- https://doi.org/10.3402/tellusb.v65i0.19576