‘CLAMP Online’: a new web-based palaeoclimate tool and its application to the terrestrial Paleogene and Neogene of North America

Yang, Jian; Spicer, Robert A.; Spicer, Teresa E. V. and Li, Cheng-sen (2011). ‘CLAMP Online’: a new web-based palaeoclimate tool and its application to the terrestrial Paleogene and Neogene of North America. Palaeobiodiversity and Palaeoenvironments, 91(3) pp. 163–183.

DOI: https://doi.org/10.1007/s12549-011-0056-2

Abstract

CLAMP Online is a new form-driven web facility enabling Climate Leaf Analysis Multivariate Program (CLAMP) palaeoclimate determinations to be conducted in their entirety without the need for additional software. This facility is demonstrated using physiognomic data from 82 Eocene to Pliocene fossil sites in North America, the Physg3brc CLAMP calibration file, and both locally derived climate data (Met3br) and 0.5° × 0.5° gridded climate data (GRIDMet3br). All the fossil sites fall within the physiog- nomic space defined by the Physg3brc dataset showing the versatility of this calibration for Paleogene to Present sites in North America. The fossil sites also plot in the mesic part of physiognomic space confirming that the source of the fossil material was vegetation growing under conditions where water was not growth-limiting to any significant degree. Regression equations are derived relating the local to the gridded climate predictions showing the relative predictive capabilities of each dataset, as well as offering ways to convert previously published data between the two calibrations. Palaeoclimate data (mean annual, warm month mean and cold month mean temperatures, growing season length, growing season and mean monthly growing season precipitation, precipitation during the three consecutive wettest and three consecutive driest months, and annual averages for relative and specific humidities and enthalpy) are given for all 82 sites.

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