 |
| Titel |
HCFC-142b emissions in China: An inventory for 2000 to 2050 basing on bottom-up and top-down methods |
| VerfasserIn |
Jiarui Han, Li Li, Shenshen Su, Jianxin Hu, Jing Wu, Yusheng Wu, Xuekun Fang |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087503
|
| Publikation (Nr.) |
 EGU/EGU2014-1555.pdf |
|
|
|
|
|
| Zusammenfassung |
| 1-Chloro-1,1-difluoroethane (HCFC-142b) is both ozone depleting substance included in the
Montreal Protocol on Substances that Deplete the Ozone Layer (Montreal Protocol) and
potent greenhouse gas with high global warming potential. As one of the major HCFC-142b
consumption and production countries in the world, China’s control action will contribute to
both mitigating climate change and protecting ozone layer. Estimating China’s HCFC-142b
emission is a crucial step for understanding its emission status, drawing up phasing-out plan
and evaluating mitigation effect. Both the bottom-up and top-down method were adopted in
this research to estimate HCFC-142b emissions from China. Results basing on different
methods were compared to test the effectiveness of two methods and validate inventory’s
reliability.
Firstly, a national bottom-up emission inventory of HCFC-142b for China during
2000–2012 was established based on the 2006 IPCC Guidelines for National Greenhouse Gas
Inventories and the Montreal Protocol, showing that in contrast to the downward trend
revealed by existing results, HCFC-142b emissions kept increasing from 0.1 kt/yr in 2000 to
the peak of 14.4 kt/yr in 2012.
Meanwhile a top-down emission estimation was also developed using interspecies
correlation method. By correlating atmospheric mixing ratio data of HCFC-142b and
reference substance HCFC-22 sampled from four representative cities (Beijing, Hangzhou,
Lanzhou and Guangzhou, for northern, eastern, western and southern China, respectively),
China’s HCFC-142b emission in 2012 was calculated. It was 16.24(13.90-18.58) kt,
equivalent to 1.06 kt ODP and 37 Tg CO2-eq, taking up 9.78% (ODP) of total HCFCs
emission in China or 30.5% of global HCFC-142b emission. This result was 12.7%
higher than that in bottom-up inventory. Possible explanations were discussed.
The consistency of two results lend credit to methods effectiveness and results
reliability.
Finally, future HCFC-142b emission was projected to 2050. Emission might experience a
continuous increase from 14.9 kt/yr to 97.2 kt/yr under business-as-usual (BAU) scenario,
while a 90% reduction would be obtained by fulfilling the Montreal Protocol, namely an
accumulative mitigation of 1578 kt from 2013 to 2050, equal to 103 kt ODP, and 3504 Tg
CO2 emissions. Therefore, China will contribute tremendously to the worldwide ozone
protection and global warming mitigation by successfully phasing out HCFC-142b according
to the Montreal Protocol schedule. |
|
|
|
|
|
|