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| DOI | 10.5194/tc-12-2099-2018 |
| Autonomous ice sheet surface mass balance measurements from cosmic rays | |
| Howat I.M.; De La Peña S.; Desilets D.; Womack G. | |
| 发表日期 | 2018 |
| ISSN | 19940416 |
| 卷号 | 12期号:6 |
| 英文摘要 | Observations of mass accumulation and net balance on glaciers and ice sheets are sparse due to the difficulty of acquiring manual measurements and the lack of a reliable remote-sensing method. The methodology for recording the water-equivalent accumulation of snowfall using the attenuation of fast neutrons generated by cosmic ray impacts was developed in the 1970s and has been employed in large-network snowpack monitoring but has yet to be applied to glaciers and ice sheets. In order to assess this potential method, we installed a cosmic ray neutron-sensing device at Summit Camp, Greenland, in April 2016. Hourly neutron count was recorded for ĝ1/4 ĝ€24 months and converted to water-equivalent thickness after correcting for variability in atmospheric pressure and incoming cosmic radiation. The daily accumulation estimates are analysed for noise level and compared to manual surface core and snow stake network measurements. Based on measurements of up to 56ĝ€cm of water equivalent, we estimate the sensor's precision to be better than 1ĝ€mm for water-equivalent thicknesses less than 14ĝ€cm and better than 1ĝ€cm in up to 140ĝ€cm, or approximately 0.7ĝ€%. Our observations agree with the surface core measurements to within their respective errors, with temporary biases that are explained by snow drifting, as supported by comparison to the snow stake network. Our observations reveal large temporal variability in accumulation on daily to monthly scales, but with similar annual totals. Based on these results, cosmic ray sensing represents a potentially transformative method for acquiring continuous in situ measurements of mass accumulation that may add constraint to glacier and ice sheet mass balance estimates from meteorological models and remote sensing. © Author(s) 2018. |
| 学科领域 | atmospheric pressure; comparative study; cosmic ray; estimation method; glacier mass balance; ice sheet; ice thickness; in situ measurement; measurement method; remote sensing; snow water equivalent; snowpack; Arctic; Greenland; Summit |
| 语种 | 英语 |
| scopus关键词 | atmospheric pressure; comparative study; cosmic ray; estimation method; glacier mass balance; ice sheet; ice thickness; in situ measurement; measurement method; remote sensing; snow water equivalent; snowpack; Arctic; Greenland; Summit |
| 来源期刊 | Cryosphere
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/119124 |
| 作者单位 | Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH, United States; School of Earth Sciences, Ohio State University, Columbus, OH, United States; Hydroinnova LLC, Albuquerque, NM, United States |
| 推荐引用方式 GB/T 7714 | Howat I.M.,De La Peña S.,Desilets D.,et al. Autonomous ice sheet surface mass balance measurements from cosmic rays[J],2018,12(6). |
| APA | Howat I.M.,De La Peña S.,Desilets D.,&Womack G..(2018).Autonomous ice sheet surface mass balance measurements from cosmic rays.Cryosphere,12(6). |
| MLA | Howat I.M.,et al."Autonomous ice sheet surface mass balance measurements from cosmic rays".Cryosphere 12.6(2018). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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