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- W2393078765 abstract "Hilbert-Huang transform (HHT) method was used to study the monthly average CH4 measurement data during May, 1991 and December, 2010 from Mt. Waliguan station. The results show that in Waliguan, CH4 volume concentration has increased gradually since 1991 and the monthly average is generally higher from 60 g/L to 110 g/L than the global monthly average. The trend of CH4 instantaneous growth rate is the same as the global average instantaneous growth rate in Waliguan, but it has a wide fluctuation range, and its value fluctuates between -8 g/(L·a) and 23 g/(L·a), with contrast to global average between -5 g/(L·a) and 15 g/(L·a). CH4 volume concentration variation of Waliguan exists six intrinsic cycles and they are as follows: 4 months, 7 months, about 1 a, about 2 a, about 5 a and about 11 a. The about 1 a cycle is closely related to the temperature 1 a cycle and rainfall 11 months cycle of Xining, where is the closest city from Waliguan station, and about 11 a cycle is related to sunspot variability 11 a cycle, and all these facts explain that they are important factors which would cause the CH4 volume concentration fluctuate." @default.
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- W2393078765 date "2013-01-01" @default.
- W2393078765 modified "2023-09-24" @default.
- W2393078765 title "Volume concentration variation and law of greenhouse gas methane" @default.
- W2393078765 hasPublicationYear "2013" @default.
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