globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-851-2019
论文题名:
Linear Optimal Runoff Aggregate (LORA): A global gridded synthesis runoff product
作者: Hobeichi S.; Abramowitz G.; Evans J.; Beck H.E.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:2
起始页码: 851
结束页码: 870
语种: 英语
Scopus关键词: Aggregates ; Stream flow ; Error covariances ; Hydrological models ; Multiple source ; Optimal weighting ; Streamflow records ; Ungauged basins ; Weighted products ; Weighting methods ; Runoff ; global perspective ; optimization ; river basin ; runoff ; seasonality ; streamflow ; uncertainty analysis
英文摘要: No synthesized global gridded runoff product, derived from multiple sources, is available, despite such a product being useful for meeting the needs of many global water initiatives. We apply an optimal weighting approach to merge runoff estimates from hydrological models constrained with observational streamflow records. The weighting method is based on the ability of the models to match observed streamflow data while accounting for error covariance between the participating products. To address the lack of observed streamflow for many regions, a dissimilarity method was applied to transfer the weights of the participating products to the ungauged basins from the closest gauged basins using dissimilarity between basins in physiographic and climatic characteristics as a proxy for distance. We perform out-of-sample tests to examine the success of the dissimilarity approach, and we confirm that the weighted product performs better than its 11 constituent products in a range of metrics. Our resulting synthesized global gridded runoff product is available at monthly timescales, and includes time-variant uncertainty, for the period 1980-2012 on a 0.5ĝ grid. The synthesized global gridded runoff product broadly agrees with published runoff estimates at many river basins, and represents the seasonal runoff cycle for most of the globe well. The new product, called Linear Optimal Runoff Aggregate (LORA), is a valuable synthesis of existing runoff products and will be freely available for download on https://geonetwork.nci.org.au/geonetwork/srv/eng/catalog.search#/metadata/f9617-9854-8096-5291 (last access: 31 January 2019). © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163051
Appears in Collections:气候变化与战略

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作者单位: Hobeichi, S., Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia, ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW 2052, Australia; Abramowitz, G., Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia, ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW 2052, Australia; Evans, J., Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia, ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW 2052, Australia; Beck, H.E., Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, United States

Recommended Citation:
Hobeichi S.,Abramowitz G.,Evans J.,et al. Linear Optimal Runoff Aggregate (LORA): A global gridded synthesis runoff product[J]. Hydrology and Earth System Sciences,2019-01-01,23(2)
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