We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Long-term measurements of tropospheric greenhouse gases in the East Asia.
- Authors
Ou-Yang, Chang-Feng; Lin, Neng-Huei; Wang, Jia-Lin; Schnell, Russell
- Abstract
This study demonstrates the observational results of primary greenhouse gases at LulinAtmospheric Background Station (LABS; 23.47˚ N, 120.87˚ E, 2,862 m a.s.l.) as a GAWstation (GAW ID: LLN) located in central Taiwan over the last decade. This high-elevationbaseline station was operated to monitor regional characteristics of atmospheric compositionsincluding trace gases, aerosols, and mercury in the free troposphere of the East Asia. Thegeographical location of the LABS allows the site to investigate the influences ofpolluted outflows from the Indochinese and eastern Asian continent. Measurements ofgreenhouse gases such as CO2, CH4, N2O, and SF6 were started at the LABS and asea-level site at Dongsha Island (DSI; 20.70˚ N, 116.73˚ E; 3 m a.s.l.) as part of theNOAA/ESRL/GMD’s Cooperative Air Sampling Network in August 2006 and March 2010,respectively. The growth rates of CO2 are 2.54 and 2.10 ppm yr−1 at the LABS and DSI, respectively.Springtime vegetation growth dramatically drew down the CO2 mixing ratios at both sites insummer. Annual maxima and minima of CH4 as well as other air pollutants such as CO, O3,and PM were observed in March and July, respectively. It was most likely caused by thelong-range transport of air masses from the Southeast Asia, where biomass-burning emissionwas intense in spring. Although the springtime air masses arriving at the LABS became muchmore originated from the eastern Asian continent in recent years, the influence of thechange on the greenhouse gases was little. The growth rates of N2O are calculatedto be 0.88 and 0.97 ppb yr−1 with no clear seasonal variations at the LABS andDSI, respectively. Similar increasing trend of SF6 was found with a growth rateof 0.31 ppt yr−1 at the LABS and 0.30 ppt yr−1 at DSI. The wintertime seasonalmaximum of SF6 was observed at both sites, but much more distinct at DSI as aresult of receiving Asian continental outflow driven by the northeast monsoon.
- Subjects
EAST Asia; SOUTHEAST Asia; TAIWAN; GREENHOUSE gases; TRACE gases; AIR masses; AIR pollutants; AIR sampling; TROPOSPHERIC ozone; CARBONACEOUS aerosols; ATMOSPHERIC mercury
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article