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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ying Han Xiuying Zhang Hong Jiang Jiaxin Jin |
| Copyright Year | 2010 |
| Description | Author affiliation: International Institute for Earth System Science, Nanjing University, Nanjing 210093, China (Ying Han; Xiuying Zhang; Hong Jiang; Jiaxin Jin) |
| Abstract | Freshwater environments contribute more than 20% of total CH4 flux to the atmosphere, and the lakes are one of the major natural sources of atmospheric CH4, mainly in boreal lakes. So, we present and analyze the temporal and spatial variations of CH4 VMRs over Lake Baikal, the only freshwater body, the unique large and high latitude lake, based on the retrieved monthly CH4 data from SCIAMACHY spectra. The result showed that monthly CH4 concentrations in atmosphere extended between 1744.780ppb and 1818.495ppb. The value in March was a relative higher value, and then increased from April to August. After this growing, the CH4 concentration decreased to September. But, there was an increased trend in October. Overall, the temporal pattern liked the ocean pattern during the growing season, and was in line with permafrost in other time. Moreover, the spatial distribution of CH4 VMRs showed that the values were higher in North Lake Baikal, followed by South, Center. The crucial controlling factor for the seasonal variation of CH4 concentration and spatial difference was both temperature, the amount of organic matter in the sediment and stability of hydrate. This exerted a direct influence on diatom and CH4 source plus (hydrate). Furthermore, the monthly CH4 concentrations by air transport were few for the size of basin over Lake Baikal and mountain barriers. So the source over Lake Baikal was itself. Based the average annual mean (8 months) atmospheric CH4 concentration and the area of the Lake Baikal $(31494Km^{2}),$ the annual CH4 flux (at all atmospheric altitude levels) was roughly estimated to be 40.03Mg yr (−1) (mean) during the period (March-October, 2003). |
| Starting Page | 1 |
| Ending Page | 6 |
| File Size | 603700 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781424473014 |
| e-ISBN | 9781424473038 |
| DOI | 10.1109/GEOINFORMATICS.2010.5567624 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-06-18 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Satellites Chemistry Hydrate Sediment Lake Baikal Atmosphere Lakes Atmospheric methane Sediments Springs SCIAMACH Meteorology |
| Content Type | Text |
| Resource Type | Article |
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