Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Network observation at the GAW stations and atmospheric CO2 mixing ratios over China

09.12.2009
Carbon dioxide (CO2) is the most important greenhouse gas regulated by the Kyoto Protocol. Human activities, such as fossil fuel burning and land use change, are major emitters of CO2, which is widely recognized as drivers of global warming and climate change.

In the past decades, the field campaign and research program were only conducted at a few sites in China by different agencies. However, none of those measurements could effectively document spatial and temporal distributions of atmospheric CO2 and provide essential information for our understanding of regional differences and distributions over China.

Thus, it is essential to establish a long-term observational network at multiple sites and carefully calibrate on internationally agreed reference scales with better quality controls.

Chinese Academy of Meteorological Sciences in Beijing initiated network observation at the four Global Atmosphere Watch (GAW) stations in China: Waliguan (36.29ºN, 100.90ºE, 3816m asl) in remote western China, Shangdianzi (40.39ºN, 117.07ºE, 293.9m asl) in northeast Beijing, Lin'an (30.3ºN, 119.73ºE, 138m asl) in Yangtze Delta, and Longfengshan (44.73ºN, 127.6ºE, 310m asl) in northeastern China. It shows for the first time the atmospheric CO2 mixing ratios and regional differences based on internationally recognized weekly air sampling data from September 2006 to August 2007. The study is reported in Issue 52 (November, 2009) of Science in China Series D: Earth Sciences.

World Meteorological Organization (WMO) through its Global Atmosphere Watch (GAW) Program, coordinates the observations of greenhouse gases in the atmosphere through a network of stations located in more than 50 countries. According to its 5th Greenhouse Gases Bulletin announced on 23 November 2009, the globally averaged mixing ratio of atmospheric CO2 in 2008 was 385.2ppm (number of molecules of the gas per million molecules of dry air), with an increase of 2.0ppm from the previous year, continuing the trend of exponential increase. Since 1750, atmospheric CO2 has increased by 38% primarily because of emissions from combustion of fossil fuels, deforestation, and land use change, contributing 63.5% to the increase in overall radiative forcing. The Bulletins provide critical information on the global state of the atmosphere in a concise manner and highlight recent accomplishments of research and technology application. The 2008 Bulletin precedes the 15th session of the United Nations Framework Convention on Climate Change (Copenhagen, 7-18 December 2009).

Long-term observation since 1990 at Waliguan GAW global station in western China validated comparable atmospheric CO2 mixing ratios to that of other global background stations in the world. The data were widely used by the WMO Greenhouse Gases Bulletins and series of scientific reports such as IPCC assessments. Results from this study further shows that atmospheric CO2 mixing ratios at Waliguan, Shangdianzi, Lin'an, and Longfengshan were 383.5, 385.9, 387.8, and 384.3 ppm, respectively, during the research period from September 2006 to August 2007. The atmospheric CO2 mixing ratio at the Waliguan station changed slightly. However, it changed sharply at the Shangdianzi and the Lin'an stations due to great influence of human activities in the Jingjinji and the Changjiang Delta economic zones, and changed regularly with seasons at Longfengshan station under dual influences of human activities and plant photosynthesis. The results from this study could lay the foundation for more profound studies in different areas of China, and could be used to improve the understanding of carbon source and sink distribution.

The authors are affiliated with the Chinese Academy of Meteorological Sciences in Beijing, the main research body of the China Meteorological Administration (CMA). In order to establish a unified Chinese atmospheric greenhouse gases observing system and well integrate it into the global network, they are keen on working with international colleagues through intensive collaborations, especially under the GAW framework. The system will link to international standard scales and improve geographical coverage of the network, which is necessary for the integrated database and for proper use. This work aims at the highest quality and accuracy possible to identify trends, seasonal variability, spatial and temporal distribution, source, and sink strengths of greenhouse gases to improve our understanding of the carbon cycle and predict how the atmosphere and climate will evolve in the future as a result of human's activities.

Funding for this research is from the National Natural Science Foundation of China (Grant No. 40775078), the National Non-profit Research Project to Serve the Public Interest (Grant No. GYHY200806026), and the International S & T Cooperation Program of the MOST (Grant No. 2007DFA20650).

Reference:

1. IPCC, 2007. Climate Change 2007: The Physical Science Basis. Cambridge University Press, Cambridge.

2. Zhou X J. The Summary Report of China Atmosphere Watch Baseline Observatory. Beijing: China Meteorological Press, 2005.

3. Zhou L X, Zhou X J, Zhang X C, et al. Progress in the study of background greenhouse gases at Waliguan observatory. Acta Meteorol Sinica, 2007, 65(3): 458-468.

4. Zhou L X, James W, White C, et al. Long-term record of atmospheric CO2 and stable isotopic ratios at Waliguan Observatory: Seasonally averaged 1991� source/sink signals, and a comparison of 1998� record to the 11 selected sites in the Northern Hemisphere. Global biogeochem Cycles, VOL 20, GB2001, doi: 10.1029/2004GB002431, 2006.

5. http://www.ipcc.cma.gov.cn/cn/

6. http://www.scichina.com:8080/sciDe/EN/volumn/current.shtml

7. http://www.bgc.mpg.de/service/iso_gas_lab/IAEA-WMO2009/index.shtml

8. http://www.wmo.int/pages/resources/multimedia/greenhousegases.html

Lingxi Zhou | EurekAlert!
Further information:
http://www.cams.cma.gov.cn

More articles from Earth Sciences:

nachricht New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland
19.01.2017 | University of Gothenburg

nachricht Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>