Independent Variables (Grids)

Lead (forecast_period)	grid: /L (months) ordered (0.5 months) to (8.5 months) by 1.0 N= 9 pts :grid
Ensemble Member (realization)	grid: /M (unitless) ordered (1.0) to (12.0) by 1.0 N= 12 pts :grid
Pressure Level (air_pressure)	grid: /P (hPa) ordered [ (200)] :grid
Forecast Start Time (forecast_reference_time)	grid: /S (months since 1960-01-01) ordered (0000 1 Jan 1981) to (0000 1 Jan 2018) by 1.0 N= 445 pts :grid
Longitude (longitude)	grid: /X (degree_east) periodic (0) to (1W) by 1.0 N= 360 pts :grid
Latitude (latitude)	grid: /Y (degree_north) ordered (90S) to (90N) by 1.0 N= 181 pts :grid
Height (height)	grid: /Z (m) ordered [ (2.0)] :grid

Other Info

ACKNOWLEDGEMENTS

In order to document NMME-Phase II data impact and enable continuing support, users of NMME data are expected to acknowledge NMME data and the participating modeling groups. The NMME model output should be referred to as "the NMME System Phase II data [https://www.earthsystemgrid.org/search.html?Project=NMME]." In publications, users should include a table (referred to below as Table XX) listing the models and institutions that provided model output used in the NMME-Phase II system, as well as the digital object identifier of publications documenting the models, where "Table XX" in the paper should list the models and modeling groups that provided the NMME data. In addition, an acknowledgement similar to the following should be included in any publication: "We acknowledge the agencies that support the NMME-Phase II system, and we thank the climate modeling groups (Environment Canada, NASA, NCAR, NOAA/GFDL, NOAA/NCEP, and University of Miami) for producing and making available their model output. NOAA/NCEP, NOAA/CTB, and NOAA/CPO jointly provided coordinating support and led development of the NMME-Phase II system." Besides the above acknowledgement, users should register any journal articles (or other scientific documents) that are based on NMME-Phase II results.

IMPORTANT

As of 2 November 2016 an error has been found and corrected in the IRI Data Library archive of the NMME NASA-GMAO-062012 January hindcast and forecast starts. In the January starts (S grid) for ensemble members (M grid) 1-4 (corresponding to starts associated with dates Dec 12th, Dec 17th, Dec 22nd, and Dec 27th), for all variables, the data in these files were being wrongly associated with the January start of the previoius year. For example, for the January 2014 start, data should be read from files named using the dates 12 Dec 2013 (ensemble member 1), 17 Dec 2013 (ensemble member 2), 22 Dec 2013 (ensemble member 3), 27 Dec 2013 (ensemble member 4), and 01 Jan 2014 (ensemble members 5-11). However, continuing with this example, in the Data Library archive, the data from ensemble members 1-4 (dated Dec 12, 17, 22, and 27 2013) were being assigned to the January 2013 start, not the intended January 2014 start. This means that in forecasts with a January monthly start time, ensemble members 1-4 would have been missing until the following January start, when these ensemble members 1-4 would have been filled with data intended for the next January monthly start, or remained missing in the case of the prec, sst, and tref variables from 2014 to 2016. This error affected only ensemble members 1-4 of the January starts, but affected all variables and all hindcast and forecast years. This error was the result of an archiving error in the Data Library, not any error in the original data files from NASA, and has been corrected as of 2 November 2016. Send any questions to help@iri.columbia.edu .

References

Kirtman, Ben P., and Coauthors, 2014: The North American Multimodel Ensemble: Phase-1 seasonal-to-interannual prediction; Phase-2 toward developing intraseasonal prediction. Bull. Amer. Meteor. Soc., 95, 585–601. doi: http://dx.doi.org/10.1175/BAMS-D-12-00050.1

Last updated: Tue, 08 Dec 2020 21:54:43 GMT