PAGES2k: Advances in climate field reconstructions
نویسندگان
چکیده
منابع مشابه
Globality and Optimality in Climate Field Reconstructions from Proxy Data
A primary objective of paleoclimate research is the characterization of natural climate variability on time scales of years to millennia. We develop here a systematic methodology for the objective and verifiable reconstruction of climate fields from sparse observational networks of proxy data, using reduced space objective analysis. In this approach we seek to reconstruct only the leading modes...
متن کاملClustering climate reconstructions
A systematic coherence analysis is presented for the set of the most prominent millennial reconstructions of Northern hemispheric temperature. The large number of mutual coherences underwent a clustering analysis that revealed five significant, mutually incoherent (“inconsistent”) clusters. The use of multiple proxies seems to be causing the 5 clustering, at least in part, but not in an easily ...
متن کاملAre multiproxy climate reconstructions robust?
[1] 64 climate reconstructions, based on regression of temperature fields on multi-proxies and mutually distinguished by at least one of six standard criteria, cover an entire spread of millennial histories. No single criterion is accountable for the spread, which appears to depend on a complicated interplay of the criteria. The uncertainty is traced back to the fact that regression is applied ...
متن کاملOn the origin of the standardization sensitivity in RegEM climate field reconstructions
The regularized expectation maximization (RegEM) method has been used in recent studies to derive climate field reconstructions of Northern Hemisphere temperatures during the last millennium. Original pseudoproxy experiments that tested RegEM [with ridge regression regularization (RegEM-Ridge)] standardized the input data in a way that improved the performance of the reconstruction method, but ...
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ژورنال
عنوان ژورنال: Past Global Changes Magazine
سال: 2014
ISSN: 2411-605X,2411-9180
DOI: 10.22498/pages.22.2.98