DOI: 10.1002/jgrd.50755
论文题名: Aircraft and tower measurements of CO<inf>2</inf> concentration in the planetary boundary layer and the lower free troposphere over southern taiga in West Siberia: Long-term records from 2002 to 2011
作者: Sasakawa M. ; Machida T. ; Tsuda N. ; Arshinov M. ; Davydov D. ; Fofonov A. ; Krasnov O.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 9489
结束页码: 9498
语种: 英语
Scopus关键词: Aircraft
; Atmospheric thermodynamics
; Ecosystems
; Troposphere
; Free troposphere
; In-situ measurement
; Local standard time
; Long term records
; Planetary boundary layers
; Seasonal amplitudes
; Vertical distributions
; Vertical variation
; Carbon dioxide
; airborne survey
; boundary layer
; carbon dioxide
; concentration (composition)
; diurnal variation
; growing season
; in situ measurement
; seasonal variation
; source-sink dynamics
; troposphere
; vertical distribution
; vertical profile
; Siberia
英文摘要: In situ measurements of the vertical distribution of carbon dioxide (CO2 ) carried out with a light aircraft over a tower site (Berezorechka; 56°08'45''N, 84°19'49''E) in the taiga region of West Siberia from October 2001 to March 2012 document the detailed seasonal and vertical variation of CO2 concentrations during daytime. The variation appears to be controlled mainly by the CO2 flux from taiga ecosystems and the height of the planetary boundary layer (PBL). We calculated average CO2 concentrations in the PBL and the lower free troposphere (LFT), both of which show clear seasonal cycles and an increasing long-term trend. Seasonal amplitude in the PBL had a larger value (29 ppm) than that in the LFT (14 ppm), demonstrating strong CO2 source-sink forcing by the taiga ecosystems. Mean CO2 concentrations during 13:00-17:00 local standard time observed at the four levels of the tower (5, 20, 40, and 80 m) showed lower CO2 concentrations than that observed in the PBL by aircraft during June-August (growing season). This negative bias decreased with increasing inlet height such that the minimum difference appeared at the 80-m inlet (-2.4 ± 0.8 ppm). No such bias was observed during other months (dormant season). The daytime CO2 flux, based on multiple vertical profiles obtained on a single day, ranged from -36.4 to 3.8 μmolm -2 s-1 during July-September. There was a clear difference in the fluxes between the morning and afternoon, suggesting that these data should be considered examples of fluxes during several daytime hours from the West Siberian taiga. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63421
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan; Global Environmental Forum, Tokyo, Japan; V.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Tomsk, Russian Federation
Recommended Citation:
Sasakawa M.,Machida T.,Tsuda N.,et al. Aircraft and tower measurements of CO<inf>2</inf> concentration in the planetary boundary layer and the lower free troposphere over southern taiga in West Siberia: Long-term records from 2002 to 2011[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)