Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027085 |
The Impact of Nonequilibrium and Equilibrium Fractionation on Two Different Deuterium Excess Definitions | |
Dutsch, Marina1; Pfahl, Stephan1; Sodemann, Harald2,3 | |
2017-12-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:23 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Norway |
英文摘要 | The deuterium excess (d) is a useful measure for nonequilibrium effects of isotopic fractionation and can therefore provide information about the meteorological conditions in evaporation regions or during ice cloud formation. In addition to nonequilibrium fractionation, two other effects can change d during phase transitions. The first is the dependence of the equilibrium fractionation factors on temperature, and the second is the nonlinearity of the scale on which d is defined. The second effect can be avoided by using an alternative definition that is based on the logarithmic scale. However, in this case d is not conserved when air parcels mix, which can lead to changes without phase transitions. Here we provide a systematic analysis of the benefits and limitations of both deuterium excess definitions by separately quantifying the impact of the nonequilibrium effect, the temperature effect, the -scale effect, and the mixing effect in a simple Rayleigh model simulating the isotopic composition of air parcels during moist adiabatic ascent. The -scale effect is important in depleted air parcels, for which it can change the sign of the traditional deuterium excess in the remaining vapor from negative to positive. The alternative definition mainly reflects the nonequilibrium and temperature effect, while the mixing effect is about 2 orders of magnitude smaller. Thus, the alternative deuterium excess definition appears to be a more accurate measure for nonequilibrium effects in situations where moisture is depleted and the -scale effect is large, for instance, at high latitudes or altitudes. |
英文关键词 | deuterium excess isotopes precipitation mixing fractionation water cycle |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419396500016 |
WOS关键词 | WATER-VAPOR ; ICE-CORE ; ISOTOPIC COMPOSITION ; SURFACE SNOW ; STABLE-ISOTOPES ; CLOUD PROCESSES ; PRECIPITATION ; ANTARCTICA ; CLIMATE ; RECORD |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34107 |
专题 | 气候变化 |
作者单位 | 1.Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, Zurich, Switzerland; 2.Univ Bergen, Inst Geophys, Bergen, Norway; 3.Bjerknes Ctr Climate Res, Bergen, Norway |
推荐引用方式 GB/T 7714 | Dutsch, Marina,Pfahl, Stephan,Sodemann, Harald. The Impact of Nonequilibrium and Equilibrium Fractionation on Two Different Deuterium Excess Definitions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(23). |
APA | Dutsch, Marina,Pfahl, Stephan,&Sodemann, Harald.(2017).The Impact of Nonequilibrium and Equilibrium Fractionation on Two Different Deuterium Excess Definitions.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(23). |
MLA | Dutsch, Marina,et al."The Impact of Nonequilibrium and Equilibrium Fractionation on Two Different Deuterium Excess Definitions".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.23(2017). |
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