Evaluating Proxy Influence in Assimilated Paleoclimate Reconstructions—Testing the Exchangeability of Two Ensembles of Spatial Processes
Evaluating Proxy Influence in Assimilated Paleoclimate Reconstructions—Testing the Exchangeability of Two Ensembles of Spatial Processes
复制标题
评估同化古气候重建中的代理影响——测试两个空间过程系综的可交换性
DOI:
10.1080/01621459.2020.1799810
复制
发表时间:
2020
影响因子:
3.7
通讯作者:
Harris, T.
中科院分区:
文献类型:
--
作者:
Harris, T.
Climate field reconstructions (CFRs) attempt to estimate spatiotemporal fields of climate variables in the past using climate proxies such as tree rings, ice cores, and corals. Data assimilation (DA) methods are a recent and promising new means of deriving CFRs that optimally fuse climate proxies with climate model output. Despite the growing application of DA-based CFRs, little is understood about how much the assimilated proxies change the statistical properties of the climate model data. To address this question, we propose a robust and computationally efficient method, based on functional data depth, to evaluate differences in the distributions of two spatiotemporal processes. We apply our test to study global and regional proxy influence in DA-based CFRs by comparing the background and analysis states, which are treated as two samples of spatiotemporal fields. We find that the analysis states are significantly altered from the climate-model-based background states due to the assimilation of proxies. Moreover, the difference between the analysis and background states increases with the number of proxies, even in regions far beyond proxy collection sites. Our approach allows us to characterize the added value of proxies, indicating where and when the analysis states are distinct from the background states. Supplementary materials for this article are available online.
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DOI:
10.1017/cbo9781107415324.013
发表时间:
2013-02
期刊:
--
影响因子:
--
作者:
V. Masson‐Delmotte;M. Schulz;A. Abe‐Ouchi;J. Beer;A. Ganopolski;J. F. G. Rouco;E. Jansen;K. Lamb
通讯作者:
V. Masson‐Delmotte;M. Schulz;A. Abe‐Ouchi;J. Beer;A. Ganopolski;J. F. G. Rouco;E. Jansen;K. Lamb
影响因子:
4.3
作者:
R. Tardif;G. Hakim;W. Perkins;K. Horlick;M. Erb;J. Emile‐Geay;D. Anderson;E. Steig;D. Noone
通讯作者:
R. Tardif;G. Hakim;W. Perkins;K. Horlick;M. Erb;J. Emile‐Geay;D. Anderson;E. Steig;D. Noone
影响因子:
4.3
作者:
J. Franke;J. Werner;R. Donner
通讯作者:
R. Donner
影响因子:
1.7
作者:
Bo Li;Xianyang Zhang;J. Smerdon
通讯作者:
J. Smerdon
影响因子:
4.5
作者:
Zu, Yijun;He, Xuming
通讯作者:
He, Xuming