Title Improved methods for PCA-based reconstructions; case study using the Steig et al. (2009) Antarctic temperature reconstruction
Author O'Donnell, R.; Lewis, N.; McIntyre, S.; Condon, J.
Source Journal of Climate, 24(8), p.2099- 2115, . Publisher: American Meteorological Society, Boston, MA, United States. ISSN: 0894-8755
Publication Date Apr. 2011
Notes In English Ant. Acc. No: 91660. GeoRef Acc. No: 310690
Index Terms climatic change; meteorology; remote sensing; temperature; weather observations; Antarctica--Antarctic Peninsula; Antarctica-- Marie Byrd Land; Antarctica--West Antarctica; Antarctic Peninsula; Antarctica; climate change; ground truth; Marie Byrd Land; reconstruction; satellite methods; seasonal variations; West Antarctica
Abstract A detailed analysis is presented of a recently published Antarctic temperature reconstruction that combines satellite and ground information using a regularized expectation-maximization algorithm. Though the general reconstruction concept has merit, it is susceptible to spurious results for both temperature trends and patterns. The deficiencies include the following: (i) improper calibration of satellite data; (ii) improper determination of spatial structure during infilling; and (iii) suboptimal determination of regularization parameters, particularly with respect to satellite principal component retention. This study proposes two methods to resolve these issues. One utilizes temporal relationships between the satellite and ground data; the other combines ground data with only the spatial component of the satellite data. (mod. journ. abst.)
URL http://hdl.handle.net/10.1175/2010JCLI3656.1
Publication Type journal article
Record ID 65004226