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Three-dimensional view of CONTRAIL's CO2 observations (left in August and right in September). The net CO2 depletion of the Asian summer monsoon high (thick red arrow) and the low level of CO2 extend layers near the surface (blue pillar above Delhi, in India). The colors on the upper panel indicate the average monthly concentrations of CO2 (subtracted atmospheric upward trend) obtained from measurements at cruising altitudes (approximately 10 km). The black arrows indicate the average monthly wind. In addition, measurements during the climb / descent above the airports illustrate vertical profiles (colored pillars). The lower panel shows the CO2 emissions (red) and absorptions (blue) of the terrestrial biosphere.
Source: CONTRAIL team
The National Institute of Environmental Studies (NIES), Japan, and the Institute of Meteorological Research (IRM), Japan is currently conducting an atmospheric measurement project called CONTRAIL (a comprehensive observation network for trace gases developed by Airliner). It is the first program in the world to continuously measure atmospheric CO concentrations 2 on board pbadenger aircraft. Japan Airlines (JAL) aircraft routinely carry a continuous CO 2 that continuously measures atmospheric CO concentrations 2 from take-off along the flight path. flight. Since the beginning of the project in 2005, more than 7 million CO 2 data from over 12,000 flights have been collected worldwide, allowing us to explore the variations detailed spatio-temporal badysis of atmospheric CO 2 on Asia-Pacific, the region that was only poorly monitored for CO concentration 2
The study was published in Chemistry and physics of the atmosphere 17 October 2018.
Atmospheric The concentration of CO 2 is increasing and climate change actions require a precise knowledge of the global carbon cycle. Asia has become increasingly important in the global carbon budget because of the rapid growth of its economy. There are still large uncertainties in the estimates of CO 2 emissions from human activities and the emissions and removals of natural vegetation in Asia. Atmospheric measurements are useful information because the abundance and gradient of CO 2 in air are essentially determined by the spatiotemporal distribution, the intensity of emissions and removals, and atmospheric transport. However, it has been difficult to set up a well-managed surveillance network in Asia. The airliner is a practical solution because it offers regular and long-term flight measurement capabilities in different countries of the world.
This study badyzed ten years of CONTRAIL CO measurement data 2 taken in the Asia-Pacific region. From global ground based atmospheric monitoring networks, it is now well known that atmospheric CO 2 is subject to significant seasonal variations with summer depletion and spring elevation (in the northern hemisphere). because of biospheric activity (photosynthesis and respiration), and thus the northern biosphere is well recognized as a factor in the seasonal cycles of atmospheric CO 2 . CONTRAIL data revealed a marked seasonality of CO 2 in Asia, which varies with latitude, longitude, and altitude. In particular, we observed a net decrease in CO concentration 2 between South Asia and Southeast Asia from August to September. The low-CO zone 2 was confined to the Asian summer monsoon anticyclone anticyclone – persistent anticyclonic circulation in the upper layers of the atmosphere (greater than 10 km altitude ) badociated with the seasonally variable monsoon regime – and to be marked by high CO 2 uptake by vegetation in South Asia. The Asian monsoon summer meteorology effectively transmits signals from South Asia's terrestrial vegetation and spreads into the Pacific after being trapped in the anticyclone. Seasonal evolutions of CO 2 absorption in Southeast Asia and the dynamic development and degradation of the summer monsoon anticyclone in Asia have a remarkable impact on the distribution of atmospheric CO 2 in Asia and the Pacific. [19659008] Measurements made by commercial CONTRAIL airliners provide high frequency 2 CO data over areas under-sampled by the global atmosphere monitoring networks. The CONTRAIL datasets will complement the measurements made on other observing platforms (ground stations and satellites) and will contribute more and more to a better understanding of the carbon cycles and the atmospheric transport of gases. at the trace level important for climate change and air pollution.
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Materials Provided by Institute on the Environment . Note: Content may be modified for style and length.
Journal Reference :
- Taku Umezawa, Hidekazu Matsueda, Yousuke Sawa, Yosuke Niwa, Toshinobu Machida, Lingxi Zhou. Seasonal badessment of tropospheric CO 2 for the Asia-Pacific region observed by the CONTRAIL commercial airliner measurements . Atmospheric chemistry and physics 2018; 18 (20): 14851 DOI: 10.5194 / acp-18-14851-2018
Cite This Page :
Institute of the Environment. "Commercial airliners reveal the three-dimensional distribution of atmospheric CO2 in the Asia-Pacific region: the seasonality of CO2 under the monsoon weather regime." ScienceDaily. ScienceDaily, November 6, 2018.
Institute on the Environment. (November 6, 2018). Commercial airliners reveal the three-dimensional distribution of atmospheric CO2 in the Asia-Pacific region: the seasonality of CO2 under the monsoon weather regime. ScienceDaily . Retrieved November 6, 2018 at www.sciencedaily.com/releases/2018/11/181106104228.htm
Institute on the Environment. "Commercial airliners reveal the three-dimensional distribution of atmospheric CO2 in the Asia-Pacific region: the seasonality of CO2 under the monsoon weather regime." ScienceDaily. www.sciencedaily.com/releases/2018/11/181106104228.htm (accessed November 6, 2018).
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