Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD030050 |
Synoptic and Mesoscale Mechanisms Drive Winter Precipitation delta O-18/delta H-2 in South-Central Alaska | |
Bailey, Hannah L.1,2,3; Klein, Eric S.4; Welker, Jeffrey M.1,2,3 | |
2019-04-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:7页码:4252-4266 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland; USA |
英文摘要 | Measurements of oxygen and hydrogen stable isotopes in precipitation (delta O-18(P) and delta H-2(P)) provide a valuable tool for understanding modern hydrological processes and the empirical foundation for interpreting paleoisotope archives. However, long-term data sets of modern delta O-18(P) and delta H-2(P) in southern Alaska are entirely absent, thus limiting our insight and application of regionally defined climate-isotope relationships in this proxy-rich region. We present and utilize a 13-year-long record of event-based delta O-18(P) and delta H-2(P) data from Anchorage, Alaska (2005-2018, n = 332), to determine the mechanisms controlling precipitation isotopes. Local surface air temperature explains similar to 30% of variability in the delta O-18(P) data with a temperature-delta O-18 slope of 0.31 %/degrees C, indicating that delta O-18(P) archives may not be suitable paleo-thermometers in this region. Instead, back-trajectory modeling reveals how winter delta O-18(P)/delta H-2(P) reflects synoptic and mesoscale processes in atmospheric circulation that drive changes in the passage of air masses with different moisture sources, transport, and rainout histories. Specifically, meridional systems-with either northerly flow from the Arctic or southerly flow from the Gulf of Alaska-have relatively low delta O-18(P)/delta H-2(P) due to progressive cooling and removal of precipitation as it condenses with altitude over Alaska's southern mountain ranges. To the contrary, zonally derived moisture from either the North Pacific and/or Bering Sea retains relatively high delta O-18(P)/delta H-2(P) values. These new data contribute a better understanding of the modern Alaska water isotope cycle and provide an empirical basis for interpreting paleoisotope archives in context of regional atmospheric circulation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467147400037 |
WOS关键词 | OXYGEN ISOTOPES ; ATMOSPHERIC CIRCULATION ; STABLE-ISOTOPES ; NORTH PACIFIC ; ICE-CORE ; CLIMATE ; VARIABILITY ; EASTERN ; DELTA-H-2 ; PATTERNS |
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/182437 |
专题 | 气候变化 |
作者单位 | 1.Univ Oulu, Ecol & Genet Res Unit, Oulu, Finland; 2.UArctic, Rovaniemi, Finland; 3.Univ Alaska Anchorage, Dept Biol Sci, Anchorage, AK 99508 USA; 4.Univ Alaska Anchorage, Dept Geol Sci, Anchorage, AK USA |
推荐引用方式 GB/T 7714 | Bailey, Hannah L.,Klein, Eric S.,Welker, Jeffrey M.. Synoptic and Mesoscale Mechanisms Drive Winter Precipitation delta O-18/delta H-2 in South-Central Alaska[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(7):4252-4266. |
APA | Bailey, Hannah L.,Klein, Eric S.,&Welker, Jeffrey M..(2019).Synoptic and Mesoscale Mechanisms Drive Winter Precipitation delta O-18/delta H-2 in South-Central Alaska.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(7),4252-4266. |
MLA | Bailey, Hannah L.,et al."Synoptic and Mesoscale Mechanisms Drive Winter Precipitation delta O-18/delta H-2 in South-Central Alaska".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.7(2019):4252-4266. |
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