Spatial scale-dependent land-atmospheric methane exchanges in the northern high latitudes from 1993 to 2004
文献类型：SCI/SSCI论文
| 作者 | Zhu X. ; Zhuang Q. ; Lu X. ; Song L. |
| 发表日期 | 2014 |
| 关键词 | carbon balance global rivers water-table model emissions wetland fluxes moisture climate ch4 |
| 英文摘要 | Effects of various spatial scales of water table dynamics on land-atmospheric methane (CH4) exchanges have not yet been assessed for large regions. Here we used a coupled hydrology-biogeochemistry model to quantify daily CH4 exchanges over the pan-Arctic from 1993 to 2004 at two spatial scales of 100 km and 5 km. The effects of sub-grid spatial variability of the water table depth (WTD) on CH4 emissions were examined with a TOPMODEL-based parameterization scheme for the northern high latitudes. We found that both WTD and CH4 emissions are better simulated at a 5 km spatial resolution. By considering the spatial heterogeneity of WTD, net regional CH4 emissions at a 5 km resolution are 38.1-55.4 TgCH(4) yr(-1) from 1993 to 2004, which are on average 42% larger than those simulated at a 100 km resolution using a grid-cell-mean WTD scheme. The difference in annual CH4 emissions is attributed to the increased emitting area and enhanced flux density with finer resolution for WTD. Further, the inclusion of sub-grid WTD spatial heterogeneity also influences the inter-annual variability of CH4 emissions. Soil temperature plays an important role in the 100 km estimates, while the 5 km estimates are mainly influenced by WTD. This study suggests that previous macro-scale biogeochemical models using a grid-cell-mean WTD scheme might have underestimated the regional CH4 emissions. The spatial scale-dependent effects of WTD should be considered in future quantification of regional CH4 emissions. |
| 出处 | Biogeosciences |
| 卷 | 11 |
| 期 | 7 |
| 页 | 1693-1704 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1726-4170 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/29342]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhu X.,Zhuang Q.,Lu X.,et al. Spatial scale-dependent land-atmospheric methane exchanges in the northern high latitudes from 1993 to 2004. 2014. |
入库方式： OAI收割
来源：地理科学与资源研究所
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