PARCIM: Proxy Assimilation for Reconstructing Climate and Improving Model

SKD-PARCIM is a strategic project at the Bjerknes Center for Climate Research (2022-2025) that combines novel model devellopements, improved paleoproxy observations, and understanding of multidecadal climate variability. Paleo-proxy observations will be used to produced an online climate reanalysis of the past milenium. They will also be used to mitigate long lasting model bias in climate models.


The main objective of PARCIM is to create the first millennium-long paleo-climate reanalysis, using modern data assimilation, model, and wealth of paleo-proxy archives. The secondary objectives are to study past climate variability and mitigate long-standing model biases.

Project Summary

 The project will be organised in 3 work packages 

WP1  bring expertise on marine-based multi-proxy reconstructions (sediment core data and sclerochronological data). We will focus on improving the age models for the last 150 years in selected North Atlantic sediment cores, which will propagate down-core and improve the overall accuracy and precision of the sediment-based age models for the past millennium. 

WP2 develop capability of assimilating the different proxies within NorCPM. We will train key model parameters. A reanalysis with the optimized system will be produced for the last millennium with 30 members and using perturbed forcings (solar and volcanic).

WP3 verify millennium reanalysis against independent ice core data, and demonstrate its great potential through addressing two hot scientific questions: what is the relative importance of external forcing versus internal climate dynamics for Atlantic multi-decadal variability, and what mechanisms govern interdecadal modulation of tropical basin interactions (Cai et al. 2019CLIVAR TBI research foci

Project Details
Funding Agency: 
Centre for Climate Dynamics - Research Council of Norway
NERSC Principal Investigator: 
François Counillon
Coordinating Institute: 
Nansen Environmental and Remote Sensing Center
Project Status: