A meta-analysis of water vapor deuterium-excess in the midlatitude atmospheric surface layer
文献类型：SCI/SSCI论文
| 作者 | Welp L. R. ; Lee X. H. ; Griffis T. J. ; Wen X. F. ; Xiao W. ; Li S. G. ; Sun X. M. ; Hu Z. M. ; Martin M. V. ; Huang J. P. |
| 发表日期 | 2012 |
| 关键词 | isotopic composition ice core nonsteady state climate-change leaf water precipitation evaporation moisture delta-o-18 o-18/o-16 |
| 英文摘要 | Deuterium-excess (d) in water is a combination of the oxygen (delta O-18) and hydrogen (delta D) isotope ratios, and its variability is thought to indicate the location and environmental conditions of the marine moisture source. In this study, we analyze d of water vapor (d(v)) from six sites, all between 37 and 44 degrees N to examine patterns in the atmospheric surface layer and identify the main drivers of variability. Two sites are in urban settings (New Haven, CT, USA and Beijing, China), two sites are in agricultural settings (Rosemount, MN, USA and Luancheng, China), and two sites are in natural ecosystems, a forest (Borden Forest, Ontario, Canada) and a grassland (Duolun, China). We found a robust diurnal cycle in d(v) at all sites with maximum values during mid-day. Isotopic land surface model simulations suggest that plant transpiration is one mechanism underlying the diurnal pattern. An isotopic large-eddy simulation model shows that entrainment of the free atmosphere into the boundary layer can also produce high d(v) values in mid-day. Daily mid-day means of d(v) were negatively correlated with local mid-day relative humidity and positively correlated with planetary boundary layer height at the North American sites, but not the Chinese sites. The mechanism for these differences is still undetermined. These results demonstrate that within the diurnal time scale, d(v) of the surface air at continental locations can be significantly altered by local processes, and is therefore not a conserved tracer of humidity from the marine moisture source region as has previously been assumed. |
| 出处 | Global Biogeochemical Cycles |
| 卷 | 26 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0886-6236 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30726]  |
| 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 | Welp L. R.,Lee X. H.,Griffis T. J.,et al. A meta-analysis of water vapor deuterium-excess in the midlatitude atmospheric surface layer. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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