基于飞机观测资料的石家庄秋季对流层CH4垂直分布特征

doi:10.3969/j.issn.1673-503X.2022.02.009

Abstract

Abstract:

To study the vertical distribution characteristics of CH₄ within the troposphere in autumn in Shijiazhuang, the King Air 350 aircraft with Picarro greenhouse gas online observer and meteorological observation equipment were used to detect CH₄ concentrations over Shijiazhuang (600-5500 m) in September, 2018.A total of seven flights were made during the survey period, and seven CH₄ concentration profiles were obtained.The results show that the average concentration of CH₄ near the surface layer (below 1000 m) over Shijiazhuang is positively correlated with that at Shangdianzi station during the same period (r=0.81, P < 0.03).During the detection period, the minimum CH₄ concentration of the seven profiles is 1898×10^-9, the maximum is 2219×10^-9, and the average concentration is 1981×10^-9.The seven profiles obtained by observations are all consistent.The concentration above 2000 m increases first and then decreases with height.The backward trajectory mode-HYSPLIT model is used to analyze the main air transport paths at different altitudes over Shijiazhuang during the detection period.The transport pathways at 600 m are shorter, and the concentration of CH₄ is greatly influenced by local emissions.At 3000 m, the air mass with higher CH₄ concentration may be transported over Shijiazhuang by the west-southwest path.The air mass transport at 5000 m has little influence on CH₄ concentration.The CH₄ concentration at this level is relatively stable and insensitive to the change of transport path.

Key words: CH₄ concentration, Vertical distribution, Aircraft observation, Backward trajectory

CLC Number:

X511

Rong MAI, Yang YANG, Gen-chang FAN, Feng LV, Xiao-bo DONG, Miao LIANG, Bo YAO. Characteristics of the vertical distribution of CH₄ in the troposphere in autumn in Shijiazhuang based on aircraft observations[J]. Journal of Meteorology and Environment, 2022, 38(2): 70-77.

Figures/Tables 6

Table 1

Fig.1

Fig.2

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Fig.4

Table 2

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编号	飞行架次	时间段	高度/m	平均浓度/(10^-9)	浓度最大值/(10^-9)	最大值高度/m
1	0908f1	19:40—20:30	2100—5500	1924±36	1960	2150
2	0909f1	16:30—18:40	600—5100	2014±157	2171	3350
3	0909f2	21:20—22:40	600—5000	2014±176	2190	2750
4	0910f1	13:20—14:10	1800—4600	1967±86	2053	3550
5	0910f2	19:40—21:00	600—2700	1976±86	2062	750
6	0914f1	11:30—13:52	600—5200	1979±240	2219	600
7	0914f2	19:12—22:00	600—5000	1994±107	2101	3150

廓线	600 m		3000 m		5000 m
廓线	轨迹类型	途经区域	轨迹类型	途经区域	轨迹类型	途经区域
1	东北	冀中南	西北	晋北、冀中	西北	蒙中、晋北、冀中
2	东南	冀南	偏西^*	晋中、冀中^*	西北	蒙中、陕北、晋中、冀中
3	东南	冀南	偏西^*	晋中、冀中^*	西北	陕北、晋中、冀中
4	西南	冀南	西南^*	晋南、晋中、冀中^*	西南	晋中、冀中
5	东南	豫北、冀南	西南	晋南、晋中、冀中	偏西	晋中、冀中
6	东南	冀中南	西南^*	晋南、晋中、冀中^*	偏西	蒙中南、陕北、晋中、冀中
7	东南	冀中南	偏西^*	晋中、冀中^*	偏西	陕北、晋中、冀中

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Characteristics of the vertical distribution of CH₄ in the troposphere in autumn in Shijiazhuang based on aircraft observations

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Characteristics of the vertical distribution of CH4 in the troposphere in autumn in Shijiazhuang based on aircraft observations

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Characteristics of the vertical distribution of CH₄ in the troposphere in autumn in Shijiazhuang based on aircraft observations