A reconstruction of global hydroclimate and dynamical variables over the Common Era
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TLDR
This database, called the Paleo Hydrodynamics Data Assimilation product (PHYDA), will provide a critical new platform for investigating the causes of past climate variability and extremes, while informing interpretations of future hydroclimate projections.Abstract:
Hydroclimate extremes critically affect human and natural systems, but there remain many unanswered questions about their causes and how to interpret their dynamics in the past and in climate change projections. These uncertainties are due, in part, to the lack of long-term, spatially resolved hydroclimate reconstructions and information on the underlying physical drivers for many regions. Here we present the first global reconstructions of hydroclimate and associated climate dynamical variables over the past two thousand years. We use a data assimilation approach tailored to reconstruct hydroclimate that optimally combines 2,978 paleoclimate proxy-data time series with the physical constraints of an atmosphere—ocean climate model. The global reconstructions are annually or seasonally resolved and include two spatiotemporal drought indices, near-surface air temperature, an index of North Atlantic variability, the location of the intertropical convergence zone, and monthly Nino indices. This database, called the Paleo Hydrodynamics Data Assimilation product (PHYDA), will provide a critical new platform for investigating the causes of past climate variability and extremes, while informing interpretations of future hydroclimate projections. Machine-accessible metadata file describing the reported data (ISA-Tab format)read more
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No evidence for globally coherent warm and cold periods over the preindustrial Common Era
TL;DR: No evidence for preindustrial globally coherent cold and warm epochs is found, indicating that preindustrial forcing was not sufficient to produce globally synchronous extreme temperatures at multidecadal and centennial timescales, and provides strong evidence that anthropogenic global warming is not only unparalleled in terms of absolute temperatures, but also unprecedented in spatial consistency within the context of the past 2,000 years.
Journal ArticleDOI
Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling
Robert Tardif,Gregory J. Hakim,W. A. Perkins,K. A. Horlick,M. P. Erb,Julien Emile-Geay,David M. Anderson,Eric J. Steig,David Noone +8 more
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Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century.
Mariano S. Morales,Edward R. Cook,Jonathan Barichivich,Jonathan Barichivich,Duncan A. Christie,Ricardo Villalba,Carlos LeQuesne,Ana Marina Srur,M. Eugenia Ferrero,Álvaro González-Reyes,Fleur Couvreux,Vladimir Matskovsky,Juan Carlos Aravena,Antonio Lara,Ignacio A. Mundo,Facundo Rojas,María Prieto,Jason E. Smerdon,Lucas Osvaldo Bianchi,Mariano Masiokas,Rocio Urrutia-Jalabert,Milagros Rodríguez-Catón,Ariel A. Muñoz,Moisés Rojas-Badilla,Claudio Alvarez,Lidio López,Brian H. Luckman,David Lister,Ian Harris,Philip Jones,A. Park Williams,Gonzalo Velazquez,Diego Aliste,Isabella Aguilera-Betti,Isabella Aguilera-Betti,Eugenia Marcotti,Felipe Flores,Tomas Muñoz,Emilio Cuq,José A. Boninsegna +39 more
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Journal ArticleDOI
Causes of climate change over the historical record
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References
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