DOI: 10.5281/zenodo.16970402
title: RAQDPS023 Predicted 2013-2016 and 2021/22 Seasonal and Annual Dry, Wet, and Total Acidic Deposition Fields and Related Concentration Fields for North America

description: Description

This data set contains model-predicted, gridded seasonal and annual dry, wet, and total acidic deposition fields and related concentration fields for North America for five years: 2013-2016 and June 2021‒May 2022.  As described by Moran et al. (2025b) these fields were generated by Environment and Climate Change Canada’s Regional Air Quality Deterministic Prediction System version 023 (RAQDPS023) using a regional configuration of the Global Environmental Multiscale‒Modelling Atmospheric CHemistry (GEM-MACH) online chemical weather forecast model. 

The regional domain considered covers most of North America, stretching from northern Mexico in the south to the Canadian Arctic archipelago and Alaska in the north.  The map projection used is a rotated latitude-longitude projection (see below for details about the coordinate reference system).  The domain is a subset of the Yin global grid (Moran et al., 2025a).  The horizontal grid size was 728 (W-E direction) by 598 (S-N direction) and the horizontal grid spacing employed was 0.09⁰ (~10 km).  For the vertical grid 84 vertical levels from the Earth’s surface to 0.1 hPa were considered on a hybrid coordinate system. 

Year-specific anthropogenic emissions were input by GEM-MACH for each of the five annual simulations, where continental anthropogenic SO2 and NOx emissions declined over this near-decadal period by 60% and 36%, respectively.  Note that wildfire and lightning emissions were not considered in these simulations.

Two closely related versions of the GEM-MACH model were used to generate these fields.  Version 3.1.0.0 of GEM-MACH (https://zenodo.org/records/15330612), which has been described in detail by Moran et al. (2025a), was used for the 2021/22 simulation while version 3.1.1.2 (https://zenodo.org/records/13952893), whose code and configuration were algorithmically identical, was used for the 2013-2016 simulations (Moran et al., 2025b).

There are 51 files in this data set: a documentation file called "README.pdf" and 50 NetCDF data files, 25 for seasonal and annual mean concentration fields and 25 for seasonal and annual accumulated deposition fields.  Plots of some of these fields can be found in Moran et al. (2025b): see Figures 1, 5, 13, 14, 18, S10, S11, S14‒S17, S22‒S24, and S31‒S36.   Monthly, seasonal, and annual evaluation scores for the predicted wet concentration and wet deposition fields for 2013-2016 can also be found in Moran et al. (2025b).

 

References

Moran, M. D., Savic-Jovcic, V., Stroud, C. A., Ménard, S., Gong, W., Zhang, J., Zheng, Q., Chen, J., Akingunola, A., Lupu, A., Menelaou, K., and Munoz-Alpizar, R.: Operational chemical weather forecasting with the ECCC online Regional Air Quality Deterministic Prediction System version 023 (RAQDPS023) – Part 1: System description, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-4323, 2025a.

Moran, M. D., Lupu, A., Savic-Jovcic, V., Zhang, J., Zheng, Q., Boutzis, E. I., Mashayekhi, R., Stroud, C. A., Ménard, S., Chen, J., Menelaou, K., Munoz-Alpizar, R., Kornic, D., and Manseau, P. M.: Operational chemical weather forecasting with the ECCC online Regional Air Quality Deterministic Prediction System version 023 (RAQDPS023) – Part 2: Multi-year prospective and retrospective performance evaluation, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-4324, 2025b.

 

Coordinate Reference System Descriptions

WKTGEOGCRS["Rotated_pole",    BASEGEOGCRS["unknown",        DATUM["unnamed",            ELLIPSOID["Sphere",6370997,0,                LENGTHUNIT["metre",1,                    ID["EPSG",9001]]]],        PRIMEM["Greenwich",0,            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]]],    DERIVINGCONVERSION["Pole rotation (netCDF CF convention)",        METHOD["Pole rotation (netCDF CF convention)"],        PARAMETER["Grid north pole latitude (netCDF CF convention)",31.7583124544932,            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]],        PARAMETER["Grid north pole longitude (netCDF CF convention)",87.597031302933,            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]],        PARAMETER["North pole grid longitude (netCDF CF convention)",0,            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]]],    CS[ellipsoidal,2],        AXIS["latitude",north,            ORDER[1],            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]],        AXIS["longitude",east,            ORDER[2],            ANGLEUNIT["degree",0.0174532925199433,                ID["EPSG",9122]]]]

Proj4+proj=ob_tran +o_proj=longlat +o_lon_p=0 +o_lat_p=31.7583124544932 +lon_0=267.597031302933 +ellps=sphere +no_defs +type=crs

NetCDFdimensions:rlat = 598 ;rlon = 728 ;string1 = 1 ;variables:float lon(rlat, rlon) ;lon:_FillValue = NaNf ;lon:standard_name = "longitude" ;lon:long_name = "longitude" ;lon:units = "degrees_east" ;lon:_CoordinateAxisType = "Lon" ;lon:axis = "X" ;float lat(rlat, rlon) ;lat:_FillValue = NaNf ;lat:standard_name = "latitude" ;lat:long_name = "latitude" ;lat:units = "degrees_north" ;lat:_CoordinateAxisType = "Lat" ;lat:axis = "Y" ;float rlon(rlon) ;rlon:_FillValue = NaNf ;rlon:standard_name = "projection_x_coordinate" ;rlon:long_name = "longitude in rotated pole grid" ;rlon:units = "degrees" ;rlon:axis = "X" ;rlon:descriptive_name = "grid_longitude" ;float rlat(rlat) ;rlat:_FillValue = NaNf ;rlat:standard_name = "projection_y_coordinate" ;rlat:long_name = "latitude in rotated pole grid" ;rlat:units = "degrees" ;rlat:axis = "Y" ;rlat:descriptive_name = "grid_latitude" ;char rotated_pole(string1) ;rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ;rotated_pole:earth_radius = 6370997. ;rotated_pole:grid_north_pole_latitude = 31.7583124544932 ;rotated_pole:grid_north_pole_longitude = 87.597031302933 ;rotated_pole:_Encoding = "utf-8" ;