Last Millennium Reanalysis (LMR) Project Data Page - version 2

version 1
version 2
updated 09/19/2019

LMR version 2 is complete and available for download.
Data is available here, and from NOAA/NCEI.

LMR references: 

Version 2

Tardif, R., G. J. Hakim, W. A. Perkins, K. A. Horlick, M. P. Erb, J. Emile-Geay, D. M. Anderson, E. J. Steig, and D. Noone, 2019: Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling. Clim. Past, 15, 1251-1273, doi:10.5194/cp-15-1251-2019.

Anderson, D. M.,
R. Tardif, K. Horlick, M. P. Erb, G. J. Hakim, D. Noone, W. A. Perkins, E. J. Steig, 2019: Additions to the Last Millennium Reanalysis multi-proxy database. Data Science Journal, 18(1), doi:10.5334/dsj-2019-002.

Version 1

Hakim, G. J., J. Emile-Geay, E. J. Steig, D. Noone, D. M. Anderson, R. Tardif, N. J. Steiger, and W. A. Perkins, 2016: The Last Millennium Climate Reanalysis Project: Framework and first results. J. Geophys. Res. Atmos.121, doi:10.1002/2016JD024751


The source code for the LMR is open on Github. Web-based documentation describing the code also provides a page with access to data to perform basic reconstructions.

- Brief description -

The data provided in the following links (see table below) are for the LMR version 2 reconstructions in netcdf format. Data from two versions are provided, both described in Tardif et al. (2019). Common aspects are: 

Differences are related to the set of assimilated proxies: 

LMR v2.1: Proxies from the PAGES2k (2017) data set*. Corresponds to results presented in Tardif et al. (2019), section 3, figures 2-5. 

LMR v2.0: Proxies from PAGES2k (2017) + Anderson et al. (2019) [see figure 8 from Tardif et al. (2019)]. Reconstruction results are discussed in Tardif et al. (2019), section 4.3, and shown in figures 9-10, (e) and (f), and in figure 11. 

with the exception of the Palmyra coral record: we used the more recent version from Emile-Geay et al (2013), instead of the version from Cobb et al. (2003) as in PAGES2k (2017); and the Kiritimati coral record: the longer record from the Anderson et al (2019) dataset, taken from Cobb et al (2013), replaces a slightly shorter record included in PAGES2k (2017).

- Data -

File and variable naming conventions follow as closely as possible those for the NOAA 20th Century Reanalysis

Gridded fields have the format: (time, MCrun, lat, lon) where time is the year, lat is the latitude index, lon is the longitude index, and MCrun indicate the Monte Carlo iteration index. There are in fact 20 LMR reconstructions contained in these arrays. They differ in the climate model ensemble prior to assimilation (random draws from the CCSM4 Last Millennium simulation) and the proxies that were drawn randomly for the reconstruction (75% of all available proxies). You probably want to start with the "grand mean," which is an average over the MCrun dimension. NOTE: the variance on the MCrun index does NOT represent the uncertainty (error) in the reconstructions! It only represents the piece from the prior and proxies. The major portion of the error is in the full ensemble, which is summarized by the spread field for each iteration.

All fields are anomalies from the 1951--1980 time-mean. 

LMR v2.0 LMR v2.1

Global and hemispheric-mean two-meter air temperature 
[format: (time, MCrun, members); this has all ensemble members]:

Global and hemispheric-mean two-meter air temperature 
[format: (time, MCrun, members); this has all ensemble members]:

Two-meter air temperature:

Two-meter air temperature:

Sea-surface temperature:

Sea-surface temperature:

500 hPa geopotential height:

500 hPa geopotential height:

Mean-sea-level pressure:

Mean-sea-level pressure:

Precipitation:

Precipitation:

Precipitable water:

Precipitable water:

Palmer drought severity index (PDSI):

Palmer drought severity index (PDSI):

Climate indices (Nino3.4, PDO, AMO etc.)
[format: (time, MCrun, members); this has all ensemble members]:

Climate indices (Nino3.4, PDO, AMO etc.)
[format: (time, MCrun, members); this has all ensemble members]: