This approach may not be useful for quantitative reconstructions of past spatial patterns of climate fields, e.g. surface temperature, sea level pressure, drought, etc.. (realclimate.org)
We assess reconstructions and modeling studies analyzing a number of different climate fields, including atmospheric circulation diagnostics, precipitation, and drought. (uscentrist.org)
«Robustness of Proxy - Based Climate Field Reconstruction Methods.» (history.aip.org)