PHYDA: Global Hydroclimate and Climate Dynamics Over 2000 Years

2,978 paleoclimate proxy-data time series are combined with an atmosphere-ocean climate model to produce the first truly global reconstructions of hydroclimate and dynamical variables from 1 to 2000 CE. Three separate reconstructions target annual means, boreal summer (JJA), and austral summer (DJF), each containing gridded surface temperature, PDSI, and SPEI at about 2-degree resolution. The dataset also includes dynamical variables like the Atlantic Multidecadal Oscillation, Nino SST indices, and the location of the Intertropical Convergence Zone.

Use Cases

• Analyzing long-term drought trends based on the Palmer Drought Severity Index (PDSI) and Standardized Precipitation Evapotranspiration Index (SPEI) reconstructions.
• Studying the relationship between global mean temperature and regional hydroclimate over two millennia.
• Investigating the influence of ocean-atmosphere dynamics, such as the Atlantic Multidecadal Oscillation and El Nino indices, on past climate.
• Validating and benchmarking climate model simulations of the past 2000 years against a spatially explicit reconstruction.

Strengths

• Integrates a large collection of 2,978 proxy time series with physical model constraints via data assimilation.
• Provides a 100-member ensemble for uncertainty quantification, available externally.
• Offers a long and consistent temporal coverage from year 1 to 2000 CE.

Limitations

• Key metadata such as row count, file size, and specific last update date are not provided across sources.
• The full 100-member ensemble is hosted externally, which may complicate data access and integration.
• Spatial resolution is limited to about 2 degrees, which may not capture local-scale climate features.

Provenance

Source

Nathan Steiger, Columbia University

Collection Method

Data assimilation reconstruction combining paleoclimate proxy records with an atmosphere-ocean climate model.

Time Range

1 CE to 2000 CE

Geography

Global