GEOSCHEM v60205
User's Guide
Contact: Bob Yantosca (bmy@io.harvard.edu)
Appendix 2: GEOSCHEM Horizontal Coordinates
The GEOSCHEM model can be run at the following horizontal resolutions:
We are currently precluded by computational limitations from running a global simulation at 1° x 1° resolution. Nevertheless, we have the capability to perform GEOSCHEM simulations for selected sub-regions of the globe at 1 x 1 resolution. At present, we have implemented two such nested-grid regions:
Yuxuan Wang has defined a nested-grid over China and SE Asia which extends from
Qinbin Li and Rynda Hudman have defined North American nested grid which extends from
These sub-regions cover approximately 10% of the entire globe, and is sufficient to allow us to perform detailed NOx-Ox-hydrocarbon chemistry simulations with our current computing hardware.
All 1° x 1° nested-grid simulations must use the GEOS3 meteorology, because GEOS1 and GEOSSTRAT meteorologies have a maximum horizontal resolution of 2° x 2.5°, and because the native resolution of GEOS4 is not 1° x 1° but rather 1° x 1.25°.
A2.1 GEOSCHEM 4 x 5 grid (regridded resolution)
4 x 5 longitude edges:
-182.50 -177.50 -172.50 -167.50 -162.50 -157.50 -152.50 -147.50 -142.50 -137.50 -132.50 -127.50 -122.50 -117.50 -112.50 -107.50 -102.50 -97.50 -92.50 -87.50 -82.50 -77.50 -72.50 -67.50 -62.50 -57.50 -52.50 -47.50 -42.50 -37.50 -32.50 -27.50 -22.50 -17.50 -12.50 -7.50 -2.50 2.50 7.50 12.50 17.50 22.50 27.50 32.50 37.50 42.50 47.50 52.50 57.50 62.50 67.50 72.50 77.50 82.50 87.50 92.50 97.50 102.50 107.50 112.50 117.50 122.50 127.50 132.50 137.50 142.50 147.50 152.50 157.50 162.50 167.50 172.50 177.50
4 x 5 longitude centers:
-180.00 -175.00 -170.00 -165.00 -160.00 -155.00 -150.00 -145.00 -140.00 -135.00 -130.00 -125.00 -120.00 -115.00 -110.00 -105.00 -100.00 -95.00 -90.00 -85.00 -80.00 -75.00 -70.00 -65.00 -60.00 -55.00 -50.00 -45.00 -40.00 -35.00 -30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00 95.00 100.00 105.00 110.00 115.00 120.00 125.00 130.00 135.00 140.00 145.00 150.00 155.00 160.00 165.00 170.00 175.004 x 5 latitude edges:
-90.00 -88.00 -84.00 -80.00 -76.00 -72.00 -68.00 -64.00 -60.00 -56.00 -52.00 -48.00 -44.00 -40.00 -36.00 -32.00 -28.00 -24.00 -20.00 -16.00 -12.00 -8.00 -4.00 0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 44.00 48.00 52.00 56.00 60.00 64.00 68.00 72.00 76.00 80.00 84.00 88.00 90.00
4 x 5 latitude centers:
-89.00 -86.00 -82.00 -78.00 -74.00 -70.00 -66.00 -62.00 -58.00 -54.00 -50.00 -46.00 -42.00 -38.00 -34.00 -30.00 -26.00 -22.00 -18.00 -14.00 -10.00 -6.00 -2.00 2.00 6.00 10.00 14.00 18.00 22.00 26.00 30.00 34.00 38.00 42.00 46.00 50.00 54.00 58.00 62.00 66.00 70.00 74.00 78.00 82.00 86.00 89.00
A2.2 GEOSCHEM 2 x 2.5 grid (GEOS1, GEOSSTRAT native resolution)
2 x 2.5 longitude edges:
-181.25 -178.75 -176.25 -173.75 -171.25 -168.75 -166.25 -163.75 -161.25 -158.75 -156.25 -153.75 -151.25 -148.75 -146.25 -143.75 -141.25 -138.75 -136.25 -133.75 -131.25 -128.75 -126.25 -123.75 -121.25 -118.75 -116.25 -113.75 -111.25 -108.75 -106.25 -103.75 -101.25 -98.75 -96.25 -93.75 -91.25 -88.75 -86.25 -83.75 -81.25 -78.75 -76.25 -73.75 -71.25 -68.75 -66.25 -63.75 -61.25 -58.75 -56.25 -53.75 -51.25 -48.75 -46.25 -43.75 -41.25 -38.75 -36.25 -33.75 -31.25 -28.75 -26.25 -23.75 -21.25 -18.75 -16.25 -13.75 -11.25 -8.75 -6.25 -3.75 -1.25 1.25 3.75 6.25 8.75 11.25 13.75 16.25 18.75 21.25 23.75 26.25 28.75 31.25 33.75 36.25 38.75 41.25 43.75 46.25 48.75 51.25 53.75 56.25 58.75 61.25 63.75 66.25 68.75 71.25 73.75 76.25 78.75 81.25 83.75 86.25 88.75 91.25 93.75 96.25 98.75 101.25 103.75 106.25 108.75 111.25 113.75 116.25 118.75 121.25 123.75 126.25 128.75 131.25 133.75 136.25 138.75 141.25 143.75 146.25 148.75 151.25 153.75 156.25 158.75 161.25 163.75 166.25 168.75 171.25 173.75 176.25 178.75
2 x 2.5 longitude centers:
-180.00 -177.50 -175.00 -172.50 -170.00 -167.50 -165.00 -162.50 -160.00 -157.50 -155.00 -152.50 -150.00 -147.50 -145.00 -142.50 -140.00 -137.50 -135.00 -132.50 -130.00 -127.50 -125.00 -122.50 -120.00 -117.50 -115.00 -112.50 -110.00 -107.50 -105.00 -102.50 -100.00 -97.50 -95.00 -92.50 -90.00 -87.50 -85.00 -82.50 -80.00 -77.50 -75.00 -72.50 -70.00 -67.50 -65.00 -62.50 -60.00 -57.50 -55.00 -52.50 -50.00 -47.50 -45.00 -42.50 -40.00 -37.50 -35.00 -32.50 -30.00 -27.50 -25.00 -22.50 -20.00 -17.50 -15.00 -12.50 -10.00 -7.50 -5.00 -2.50 0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00 22.50 25.00 27.50 30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00 52.50 55.00 57.50 60.00 62.50 65.00 67.50 70.00 72.50 75.00 77.50 80.00 82.50 85.00 87.50 90.00 92.50 95.00 97.50 100.00 102.50 105.00 107.50 110.00 112.50 115.00 117.50 120.00 122.50 125.00 127.50 130.00 132.50 135.00 137.50 140.00 142.50 145.00 147.50 150.00 152.50 155.00 157.50 160.00 162.50 165.00 167.50 170.00 172.50 175.00 177.50
2 x 2.5 latitude edges:
-90.00 -89.00 -87.00 -85.00 -83.00 -81.00 -79.00 -77.00 -75.00 -73.00 -71.00 -69.00 -67.00 -65.00 -63.00 -61.00 -59.00 -57.00 -55.00 -53.00 -51.00 -49.00 -47.00 -45.00 -43.00 -41.00 -39.00 -37.00 -35.00 -33.00 -31.00 -29.00 -27.00 -25.00 -23.00 -21.00 -19.00 -17.00 -15.00 -13.00 -11.00 -9.00 -7.00 -5.00 -3.00 -1.00 1.00 3.00 5.00 7.00 9.00 11.00 13.00 15.00 17.00 19.00 21.00 23.00 25.00 27.00 29.00 31.00 33.00 35.00 37.00 39.00 41.00 43.00 45.00 47.00 49.00 51.00 53.00 55.00 57.00 59.00 61.00 63.00 65.00 67.00 69.00 71.00 73.00 75.00 77.00 79.00 81.00 83.00 85.00 87.00 89.00 90.00
2 x 2.5 latitude centers:
-89.50 -88.00 -86.00 -84.00 -82.00 -80.00 -78.00 -76.00 -74.00 -72.00 -70.00 -68.00 -66.00 -64.00 -62.00 -60.00 -58.00 -56.00 -54.00 -52.00 -50.00 -48.00 -46.00 -44.00 -42.00 -40.00 -38.00 -36.00 -34.00 -32.00 -30.00 -28.00 -26.00 -24.00 -22.00 -20.00 -18.00 -16.00 -14.00 -12.00 -10.00 -8.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 82.00 84.00 86.00 88.00 89.50
NOTE: At present, GEOSCHEM
cannot run on the GEOS4 1 x 1.25 grid in global mode. Current procedure
is to regrid the meteorological fields to both 2 x 2.5 and 4 x 5 and then to
run GEOSCHEM at these resolutions.
GEOS4/fvDAS 1 x 1.25 Grid
1 x 1.25 longitude edges:
-180.62 -179.38 -178.12 -176.88 -175.62 -174.38 -173.12 -171.88 -170.62 -169.38 -168.12 -166.88 -165.62 -164.38 -163.12 -161.88 -160.62 -159.38 -158.12 -156.88 -155.62 -154.38 -153.12 -151.88 -150.62 -149.38 -148.12 -146.88 -145.62 -144.38 -143.12 -141.88 -140.62 -139.38 -138.12 -136.88 -135.62 -134.38 -133.12 -131.88 -130.62 -129.38 -128.12 -126.88 -125.62 -124.38 -123.12 -121.88 -120.62 -119.38 -118.12 -116.88 -115.62 -114.38 -113.12 -111.88 -110.62 -109.38 -108.12 -106.88 -105.62 -104.38 -103.12 -101.88 -100.62 -99.38 -98.12 -96.88 -95.62 -94.38 -93.12 -91.88 -90.62 -89.38 -88.12 -86.88 -85.62 -84.38 -83.12 -81.88 -80.62 -79.38 -78.12 -76.88 -75.62 -74.38 -73.12 -71.88 -70.62 -69.38 -68.12 -66.88 -65.62 -64.38 -63.12 -61.88 -60.62 -59.38 -58.12 -56.88 -55.62 -54.38 -53.12 -51.88 -50.62 -49.38 -48.12 -46.88 -45.62 -44.38 -43.12 -41.88 -40.62 -39.38 -38.12 -36.88 -35.62 -34.38 -33.12 -31.88 -30.62 -29.38 -28.12 -26.88 -25.62 -24.38 -23.12 -21.88 -20.62 -19.38 -18.12 -16.88 -15.62 -14.38 -13.12 -11.88 -10.62 -9.38 -8.12 -6.88 -5.62 -4.38 -3.12 -1.88 -0.62 0.62 1.88 3.12 4.38 5.62 6.88 8.12 9.38 10.62 11.88 13.12 14.38 15.62 16.88 18.12 19.38 20.62 21.88 23.12 24.38 25.62 26.88 28.12 29.38 30.62 31.88 33.12 34.38 35.62 36.88 38.12 39.38 40.62 41.88 43.12 44.38 45.62 46.88 48.12 49.38 50.62 51.88 53.12 54.38 55.62 56.88 58.12 59.38 60.62 61.88 63.12 64.38 65.62 66.88 68.12 69.38 70.62 71.88 73.12 74.38 75.62 76.88 78.12 79.38 80.62 81.88 83.12 84.38 85.62 86.88 88.12 89.38 90.62 91.88 93.12 94.38 95.62 96.88 98.12 99.38 100.62 101.88 103.12 104.38 105.62 106.88 108.12 109.38 110.62 111.88 113.12 114.38 115.62 116.88 118.12 119.38 120.62 121.88 123.12 124.38 125.62 126.88 128.12 129.38 130.62 131.88 133.12 134.38 135.62 136.88 138.12 139.38 140.62 141.88 143.12 144.38 145.62 146.88 148.12 149.38 150.62 151.88 153.12 154.38 155.62 156.88 158.12 159.38 160.62 161.88 163.12 164.38 165.62 166.88 168.12 169.38 170.62 171.88 173.12 174.38 175.62 176.88 178.12 179.38
1 x 1.25 longitude centers:
-180.00 -178.75 -177.50 -176.25 -175.00 -173.75 -172.50 -171.25 -170.00 -168.75 -167.50 -166.25 -165.00 -163.75 -162.50 -161.25 -160.00 -158.75 -157.50 -156.25 -155.00 -153.75 -152.50 -151.25 -150.00 -148.75 -147.50 -146.25 -145.00 -143.75 -142.50 -141.25 -140.00 -138.75 -137.50 -136.25 -135.00 -133.75 -132.50 -131.25 -130.00 -128.75 -127.50 -126.25 -125.00 -123.75 -122.50 -121.25 -120.00 -118.75 -117.50 -116.25 -115.00 -113.75 -112.50 -111.25 -110.00 -108.75 -107.50 -106.25 -105.00 -103.75 -102.50 -101.25 -100.00 -98.75 -97.50 -96.25 -95.00 -93.75 -92.50 -91.25 -90.00 -88.75 -87.50 -86.25 -85.00 -83.75 -82.50 -81.25 -80.00 -78.75 -77.50 -76.25 -75.00 -73.75 -72.50 -71.25 -70.00 -68.75 -67.50 -66.25 -65.00 -63.75 -62.50 -61.25 -60.00 -58.75 -57.50 -56.25 -55.00 -53.75 -52.50 -51.25 -50.00 -48.75 -47.50 -46.25 -45.00 -43.75 -42.50 -41.25 -40.00 -38.75 -37.50 -36.25 -35.00 -33.75 -32.50 -31.25 -30.00 -28.75 -27.50 -26.25 -25.00 -23.75 -22.50 -21.25 -20.00 -18.75 -17.50 -16.25 -15.00 -13.75 -12.50 -11.25 -10.00 -8.75 -7.50 -6.25 -5.00 -3.75 -2.50 -1.25 0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.00 11.25 12.50 13.75 15.00 16.25 17.50 18.75 20.00 21.25 22.50 23.75 25.00 26.25 27.50 28.75 30.00 31.25 32.50 33.75 35.00 36.25 37.50 38.75 40.00 41.25 42.50 43.75 45.00 46.25 47.50 48.75 50.00 51.25 52.50 53.75 55.00 56.25 57.50 58.75 60.00 61.25 62.50 63.75 65.00 66.25 67.50 68.75 70.00 71.25 72.50 73.75 75.00 76.25 77.50 78.75 80.00 81.25 82.50 83.75 85.00 86.25 87.50 88.75 90.00 91.25 92.50 93.75 95.00 96.25 97.50 98.75 100.00 101.25 102.50 103.75 105.00 106.25 107.50 108.75 110.00 111.25 112.50 113.75 115.00 116.25 117.50 118.75 120.00 121.25 122.50 123.75 125.00 126.25 127.50 128.75 130.00 131.25 132.50 133.75 135.00 136.25 137.50 138.75 140.00 141.25 142.50 143.75 145.00 146.25 147.50 148.75 150.00 151.25 152.50 153.75 155.00 156.25 157.50 158.75 160.00 161.25 162.50 163.75 165.00 166.25 167.50 168.75 170.00 171.25 172.50 173.75 175.00 176.25 177.50 178.75
1 x 1.25 latitude edges:
-90.00 -89.50 -88.50 -87.50 -86.50 -85.50 -84.50 -83.50 -82.50 -81.50 -80.50 -79.50 -78.50 -77.50 -76.50 -75.50 -74.50 -73.50 -72.50 -71.50 -70.50 -69.50 -68.50 -67.50 -66.50 -65.50 -64.50 -63.50 -62.50 -61.50 -60.50 -59.50 -58.50 -57.50 -56.50 -55.50 -54.50 -53.50 -52.50 -51.50 -50.50 -49.50 -48.50 -47.50 -46.50 -45.50 -44.50 -43.50 -42.50 -41.50 -40.50 -39.50 -38.50 -37.50 -36.50 -35.50 -34.50 -33.50 -32.50 -31.50 -30.50 -29.50 -28.50 -27.50 -26.50 -25.50 -24.50 -23.50 -22.50 -21.50 -20.50 -19.50 -18.50 -17.50 -16.50 -15.50 -14.50 -13.50 -12.50 -11.50 -10.50 -9.50 -8.50 -7.50 -6.50 -5.50 -4.50 -3.50 -2.50 -1.50 -0.50 0.50 1.50 2.50 3.50 4.50 5.50 6.50 7.50 8.50 9.50 10.50 11.50 12.50 13.50 14.50 15.50 16.50 17.50 18.50 19.50 20.50 21.50 22.50 23.50 24.50 25.50 26.50 27.50 28.50 29.50 30.50 31.50 32.50 33.50 34.50 35.50 36.50 37.50 38.50 39.50 40.50 41.50 42.50 43.50 44.50 45.50 46.50 47.50 48.50 49.50 50.50 51.50 52.50 53.50 54.50 55.50 56.50 57.50 58.50 59.50 60.50 61.50 62.50 63.50 64.50 65.50 66.50 67.50 68.50 69.50 70.50 71.50 72.50 73.50 74.50 75.50 76.50 77.50 78.50 79.50 80.50 81.50 82.50 83.50 84.50 85.50 86.50 87.50 88.50 89.50 90.00
1 x 1.25 latitude centers:
-89.75 -89.00 -88.00 -87.00 -86.00 -85.00 -84.00 -83.00 -82.00 -81.00 -80.00 -79.00 -78.00 -77.00 -76.00 -75.00 -74.00 -73.00 -72.00 -71.00 -70.00 -69.00 -68.00 -67.00 -66.00 -65.00 -64.00 -63.00 -62.00 -61.00 -60.00 -59.00 -58.00 -57.00 -56.00 -55.00 -54.00 -53.00 -52.00 -51.00 -50.00 -49.00 -48.00 -47.00 -46.00 -45.00 -44.00 -43.00 -42.00 -41.00 -40.00 -39.00 -38.00 -37.00 -36.00 -35.00 -34.00 -33.00 -32.00 -31.00 -30.00 -29.00 -28.00 -27.00 -26.00 -25.00 -24.00 -23.00 -22.00 -21.00 -20.00 -19.00 -18.00 -17.00 -16.00 -15.00 -14.00 -13.00 -12.00 -11.00 -10.00 -9.00 -8.00 -7.00 -6.00 -5.00 -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 73.00 74.00 75.00 76.00 77.00 78.00 79.00 80.00 81.00 82.00 83.00 84.00 85.00 86.00 87.00 88.00 89.00 89.75
NOTE: At present, GEOSCHEM
cannot perform a global simulation at 1 x 1 resolution due to computational
limits. However, GEOSCHEM can run at 1 x 1 resolution for a "nested"
window region. See description at the top of this page for details.
1 x 1 longitude edges:
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1 x 1 longitude centers:
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