The Arctic System Reanalysis (ASR)

Funded by:

- Office of Naval Research (ONR) (April 2018 - April 2021) to bring ASRv2.1 up to date.

- NASA (June 2015 - June 2017) to complete ASRv2 2000-2012

- The National Science Foundation as an International Polar Year (IPY) project

Latest News on ASR (2018/04/11):

ASRv2 15-km has been completed for 2000-2012 and is available at NCAR CISL RDA. Expedited completion was facilitated by the Ohio Supercomputer Center providing enhanced access to their new Owens cluster. A full description of ASRv2 is in the Bulletin of the American Meteorological Society (PDF).

ASRv2 2013-2016 is now complete and will be available shortly from NCAR. 2017 and 2018 are in production.

Because of local computer issues, we need to rerun ASRv2. We will take advantage of this requirement to update ASRv2 using the latest version 3.9.1 of WRF and WRFDA, change the microphysics scheme to Morrison with specified variable aerosol concentrations, and output the surface variables at hourly intervals. Horizontal and vertical resolution will remain the same as ASRv2. We call this new version ASRv2.1. We expect to complete 2000-2018 by early 2019, and then to keep ASRv2.1 up to date with a delay of roughly 3 months. This will be continued at least through the end of the MOSAiC drift campaign in the Arctic, i.e., end of 2020. ASRv2.1 will be available through NCAR.

ASRv1 30-km (formerly ASR final version) is complete for January 1, 2000 - December 31, 2012 and will not be extended. ASRv1 30-km is available at the NCAR CISL RDA. A write-up on ASRv1 is available in Bromwich et al. (2016) see below.

Some results for ASRv2 15-km for 2007

Known issues with ASRv1 30-km


The Arctic System Reanalysis (ASR), which can be viewed as a blend of modeling and observations, provides a high resolution description in space (15 km) and time (3 h) of the atmosphere-sea ice-land surface system of the Arctic. The ASR ingests historical data streams of the physical components of the Arctic. Gridded fields from the ASR, such as temperature, radiation and winds, also serve as drivers for coupled ice-ocean, land surface and other models. The ASR permits reconstructions of the Arctic system's state, thereby serving as a state-of-the-art synthesis tool for assessing Arctic climate variability and monitoring Arctic change.

Recent publications based in part or entirely on ASR