globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025131
论文题名:
Estimation of volcanic ash emissions through assimilating satellite data and ground-based observations
作者: Lu S.; Lin H.X.; Heemink A.; Segers A.; Fu G.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2016
卷: 121, 期:18
起始页码: 10971
结束页码: 10994
语种: 英语
英文关键词: data assimilation ; emission estimation ; satellite data ; volcanic ash
Scopus关键词: accuracy assessment ; data assimilation ; emission ; estimation method ; experimental study ; ground-based measurement ; mantle plume ; performance assessment ; satellite data ; trajectory ; vertical profile ; volcanic ash ; volcanic cloud
英文摘要: In this paper, we reconstruct the vertical profile of volcanic ash emissions by assimilating satellite data and ground-based observations using a modified trajectory-based 4D-Var (Trj4DVar) approach. In our previous work, we found that the lack of vertical resolution in satellite ash column data can result in a poor estimation of the injection layer where the ash is emitted into the atmosphere. The injection layer is crucial for the forecast of volcanic ash clouds. To improve estimation, Trj4DVar was implemented, and it has shown increased performance in twin experiments using synthetic observations. However, there are some cases with real satellite data where Trj4DVar has difficulty in obtaining an accurate estimation of the injection layer. To remedy this, we propose a modification of Trj4DVar, test it with synthetic twin experiments, and evaluate real data performance. The results show that the modified Trj4DVar is able to accurately estimate the injection height (location of the maximal emission rate) by incorporating the plume height (top of the ash plume) and mass eruption rate data obtained from ground-based observations near the source into the assimilation system. This will produce more accurate emission estimations and more reliable forecasts of volcanic ash clouds. Also provided are two strategies on the preprocessing and proper use of satellite data. ©2016. The Authors.
资助项目: "We thank Prata (Nicarnica Aviation AS, Gunnar Randers vei 24, NO-2007 Kjeller, Norway) for providing SEVIRI data and his suggestions on the use of the data. The data used in this study are available from the European Space Agency (ESA) project—Volcanic Ash Strategic initiative Team (VAST) and can be downloaded from http://vast.nilu.no/test-database/volcano/Eyjafjallajokull/eruption/2010-04-14/main_data_type/Satellite/specific_data_type/seviri/. (Registration required). We are very grateful to the Editor and reviewers for their reviews and insightful comments and suggestions. The first and the last author thank China Scholarship Council for the financial support.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62836
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Delft Institute of Applied Mathematics, Delft University of Technology, Delft, Netherlands; Department of Climate, Air and Sustainability, TNO, Utrecht, Netherlands

Recommended Citation:
Lu S.,Lin H.X.,Heemink A.,et al. Estimation of volcanic ash emissions through assimilating satellite data and ground-based observations[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)
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