File OMAERUV_VXXX_GLOBAL_MONTHLY_2005_TO_2013.sav contains gridded (0.50 lat X 0.50 lon) monthly average values of aerosol parameters reported by the OMAERUV algorithm (Aerosol Optical Depth, Aerosol Single Scattering Albedo, Aerosol Absorption Optical Depth, and UV Aerosol Index) at three wavelengths (354, 388, and 500 nm). File OMAERUV_VXXX_GLOBAL_NDAY_2005_TO_2013.sav contains the number of data points per-grid box used in the calculation of the monthly averages of AOD, SSA, and AAOD. Except for the UV_AI, the number of days per month when retrievals are reported is reduced by cloud contamination. XXX indicates data version: 142 is the currently publicly available data set 147 is a research version to be released in the near future. Because Land and Ocean algorithms are slightly different, discontinuities in land-ocean boundaries are possible when plotting the data on the same map. A water-land mask file at 0.5 deg resolution is made available (OMAERUV_GLOBAL_LNDWAT.sav) to facilitate the separate visualization of the land and ocean data products. Files can easily be read in IDL using the 'restore' command IDL> RESTORE, 'OMAERUV_V147_GLOBAL_MONTHLY_2005_TO_2013.sav' IDL> HELP OMAERUV FLOAT = Array[XDIM, YDIM, NWV, NVAR, NMONTHS] Variable name: OMAERUV XDIM = 720 -- number of grid points in longitude direction YDIM = 360 -- number of grid points in latitude direction NWV = 3 -- number of wavelengths in the order 354, 388, 500 nm NVAR = 4 -- number of variable in the order AOD, SSA, AAOD, UV-AI NMONTHS = 108 -- number of months starting January 2005 through December 2013 (9years x 12months) IDL> RESTORE, 'OMAERUV_V147_GLOBAL_NDAY_2005_TO_2013.sav' IDL> HELP % At $MAIN$ NDAY FLOAT = Array[720, 360, 108] Compiled Procedures: $MAIN$ Compiled Functions: IDL> Variable name: NDAY XDIM = 720 -- number of grid points in longitude direction YDIM = 360 -- number of grid points in latitude direction NMONTHS = 108 -- number of months starting January 2005 through December 2013 (9years x 12months) ******************************************************************************************** The center coordinates for each grid can be generated through following IDL commands: The longtudes grid go from WEST to EAST and latitude grids go from SOUTH to NORTH. IDL> lon_g=FINDGEN(720)*0.5-180.+0.25 IDL> lat_g=FINDGEN(360)*0.5-90.+0.25 IDL> PRINT, lon_g -179.750 -179.250 -178.750 -178.250 -177.750 -177.250 -176.750 -176.250 -175.750 -175.250 -174.750 -174.250 -173.750 -173.250 -172.750 -172.250 -171.750 -171.250 -170.750 -170.250 -169.750 -169.250 -168.750 -168.250 -167.750 -167.250 -166.750 -166.250 -165.750 -165.250 -164.750 -164.250 -163.750 -163.250 -162.750 -162.250 -161.750 -161.250 -160.750 -160.250 -159.750 -159.250 -158.750 -158.250 -157.750 -157.250 -156.750 -156.250 -155.750 -155.250 -154.750 -154.250 -153.750 -153.250 -152.750 -152.250 -151.750 -151.250 -150.750 -150.250 -149.750 -149.250 -148.750 -148.250 -147.750 -147.250 -146.750 -146.250 -145.750 -145.250 -144.750 -144.250 -143.750 -143.250 -142.750 -142.250 -141.750 -141.250 -140.750 -140.250 -139.750 -139.250 -138.750 -138.250 -137.750 -137.250 -136.750 -136.250 -135.750 -135.250 -134.750 -134.250 -133.750 -133.250 -132.750 -132.250 -131.750 -131.250 -130.750 -130.250 -129.750 -129.250 -128.750 -128.250 -127.750 -127.250 -126.750 -126.250 -125.750 -125.250 -124.750 -124.250 -123.750 -123.250 -122.750 -122.250 -121.750 -121.250 -120.750 -120.250 -119.750 -119.250 -118.750 -118.250 -117.750 -117.250 -116.750 -116.250 -115.750 -115.250 -114.750 -114.250 -113.750 -113.250 -112.750 -112.250 -111.750 -111.250 -110.750 -110.250 -109.750 -109.250 -108.750 -108.250 -107.750 -107.250 -106.750 -106.250 -105.750 -105.250 -104.750 -104.250 -103.750 -103.250 -102.750 -102.250 -101.750 -101.250 -100.750 -100.250 -99.7500 -99.2500 -98.7500 -98.2500 -97.7500 -97.2500 -96.7500 -96.2500 -95.7500 -95.2500 -94.7500 -94.2500 -93.7500 -93.2500 -92.7500 -92.2500 -91.7500 -91.2500 -90.7500 -90.2500 -89.7500 -89.2500 -88.7500 -88.2500 -87.7500 -87.2500 -86.7500 -86.2500 -85.7500 -85.2500 -84.7500 -84.2500 -83.7500 -83.2500 -82.7500 -82.2500 -81.7500 -81.2500 -80.7500 -80.2500 -79.7500 -79.2500 -78.7500 -78.2500 -77.7500 -77.2500 -76.7500 -76.2500 -75.7500 -75.2500 -74.7500 -74.2500 -73.7500 -73.2500 -72.7500 -72.2500 -71.7500 -71.2500 -70.7500 -70.2500 -69.7500 -69.2500 -68.7500 -68.2500 -67.7500 -67.2500 -66.7500 -66.2500 -65.7500 -65.2500 -64.7500 -64.2500 -63.7500 -63.2500 -62.7500 -62.2500 -61.7500 -61.2500 -60.7500 -60.2500 -59.7500 -59.2500 -58.7500 -58.2500 -57.7500 -57.2500 -56.7500 -56.2500 -55.7500 -55.2500 -54.7500 -54.2500 -53.7500 -53.2500 -52.7500 -52.2500 -51.7500 -51.2500 -50.7500 -50.2500 -49.7500 -49.2500 -48.7500 -48.2500 -47.7500 -47.2500 -46.7500 -46.2500 -45.7500 -45.2500 -44.7500 -44.2500 -43.7500 -43.2500 -42.7500 -42.2500 -41.7500 -41.2500 -40.7500 -40.2500 -39.7500 -39.2500 -38.7500 -38.2500 -37.7500 -37.2500 -36.7500 -36.2500 -35.7500 -35.2500 -34.7500 -34.2500 -33.7500 -33.2500 -32.7500 -32.2500 -31.7500 -31.2500 -30.7500 -30.2500 -29.7500 -29.2500 -28.7500 -28.2500 -27.7500 -27.2500 -26.7500 -26.2500 -25.7500 -25.2500 -24.7500 -24.2500 -23.7500 -23.2500 -22.7500 -22.2500 -21.7500 -21.2500 -20.7500 -20.2500 -19.7500 -19.2500 -18.7500 -18.2500 -17.7500 -17.2500 -16.7500 -16.2500 -15.7500 -15.2500 -14.7500 -14.2500 -13.7500 -13.2500 -12.7500 -12.2500 -11.7500 -11.2500 -10.7500 -10.2500 -9.75000 -9.25000 -8.75000 -8.25000 -7.75000 -7.25000 -6.75000 -6.25000 -5.75000 -5.25000 -4.75000 -4.25000 -3.75000 -3.25000 -2.75000 -2.25000 -1.75000 -1.25000 -0.750000 -0.250000 0.250000 0.750000 1.25000 1.75000 2.25000 2.75000 3.25000 3.75000 4.25000 4.75000 5.25000 5.75000 6.25000 6.75000 7.25000 7.75000 8.25000 8.75000 9.25000 9.75000 10.2500 10.7500 11.2500 11.7500 12.2500 12.7500 13.2500 13.7500 14.2500 14.7500 15.2500 15.7500 16.2500 16.7500 17.2500 17.7500 18.2500 18.7500 19.2500 19.7500 20.2500 20.7500 21.2500 21.7500 22.2500 22.7500 23.2500 23.7500 24.2500 24.7500 25.2500 25.7500 26.2500 26.7500 27.2500 27.7500 28.2500 28.7500 29.2500 29.7500 30.2500 30.7500 31.2500 31.7500 32.2500 32.7500 33.2500 33.7500 34.2500 34.7500 35.2500 35.7500 36.2500 36.7500 37.2500 37.7500 38.2500 38.7500 39.2500 39.7500 40.2500 40.7500 41.2500 41.7500 42.2500 42.7500 43.2500 43.7500 44.2500 44.7500 45.2500 45.7500 46.2500 46.7500 47.2500 47.7500 48.2500 48.7500 49.2500 49.7500 50.2500 50.7500 51.2500 51.7500 52.2500 52.7500 53.2500 53.7500 54.2500 54.7500 55.2500 55.7500 56.2500 56.7500 57.2500 57.7500 58.2500 58.7500 59.2500 59.7500 60.2500 60.7500 61.2500 61.7500 62.2500 62.7500 63.2500 63.7500 64.2500 64.7500 65.2500 65.7500 66.2500 66.7500 67.2500 67.7500 68.2500 68.7500 69.2500 69.7500 70.2500 70.7500 71.2500 71.7500 72.2500 72.7500 73.2500 73.7500 74.2500 74.7500 75.2500 75.7500 76.2500 76.7500 77.2500 77.7500 78.2500 78.7500 79.2500 79.7500 80.2500 80.7500 81.2500 81.7500 82.2500 82.7500 83.2500 83.7500 84.2500 84.7500 85.2500 85.7500 86.2500 86.7500 87.2500 87.7500 88.2500 88.7500 89.2500 89.7500 90.2500 90.7500 91.2500 91.7500 92.2500 92.7500 93.2500 93.7500 94.2500 94.7500 95.2500 95.7500 96.2500 96.7500 97.2500 97.7500 98.2500 98.7500 99.2500 99.7500 100.250 100.750 101.250 101.750 102.250 102.750 103.250 103.750 104.250 104.750 105.250 105.750 106.250 106.750 107.250 107.750 108.250 108.750 109.250 109.750 110.250 110.750 111.250 111.750 112.250 112.750 113.250 113.750 114.250 114.750 115.250 115.750 116.250 116.750 117.250 117.750 118.250 118.750 119.250 119.750 120.250 120.750 121.250 121.750 122.250 122.750 123.250 123.750 124.250 124.750 125.250 125.750 126.250 126.750 127.250 127.750 128.250 128.750 129.250 129.750 130.250 130.750 131.250 131.750 132.250 132.750 133.250 133.750 134.250 134.750 135.250 135.750 136.250 136.750 137.250 137.750 138.250 138.750 139.250 139.750 140.250 140.750 141.250 141.750 142.250 142.750 143.250 143.750 144.250 144.750 145.250 145.750 146.250 146.750 147.250 147.750 148.250 148.750 149.250 149.750 150.250 150.750 151.250 151.750 152.250 152.750 153.250 153.750 154.250 154.750 155.250 155.750 156.250 156.750 157.250 157.750 158.250 158.750 159.250 159.750 160.250 160.750 161.250 161.750 162.250 162.750 163.250 163.750 164.250 164.750 165.250 165.750 166.250 166.750 167.250 167.750 168.250 168.750 169.250 169.750 170.250 170.750 171.250 171.750 172.250 172.750 173.250 173.750 174.250 174.750 175.250 175.750 176.250 176.750 177.250 177.750 178.250 178.750 179.250 179.750 IDL> PRINT, lat_g -89.7500 -89.2500 -88.7500 -88.2500 -87.7500 -87.2500 -86.7500 -86.2500 -85.7500 -85.2500 -84.7500 -84.2500 -83.7500 -83.2500 -82.7500 -82.2500 -81.7500 -81.2500 -80.7500 -80.2500 -79.7500 -79.2500 -78.7500 -78.2500 -77.7500 -77.2500 -76.7500 -76.2500 -75.7500 -75.2500 -74.7500 -74.2500 -73.7500 -73.2500 -72.7500 -72.2500 -71.7500 -71.2500 -70.7500 -70.2500 -69.7500 -69.2500 -68.7500 -68.2500 -67.7500 -67.2500 -66.7500 -66.2500 -65.7500 -65.2500 -64.7500 -64.2500 -63.7500 -63.2500 -62.7500 -62.2500 -61.7500 -61.2500 -60.7500 -60.2500 -59.7500 -59.2500 -58.7500 -58.2500 -57.7500 -57.2500 -56.7500 -56.2500 -55.7500 -55.2500 -54.7500 -54.2500 -53.7500 -53.2500 -52.7500 -52.2500 -51.7500 -51.2500 -50.7500 -50.2500 -49.7500 -49.2500 -48.7500 -48.2500 -47.7500 -47.2500 -46.7500 -46.2500 -45.7500 -45.2500 -44.7500 -44.2500 -43.7500 -43.2500 -42.7500 -42.2500 -41.7500 -41.2500 -40.7500 -40.2500 -39.7500 -39.2500 -38.7500 -38.2500 -37.7500 -37.2500 -36.7500 -36.2500 -35.7500 -35.2500 -34.7500 -34.2500 -33.7500 -33.2500 -32.7500 -32.2500 -31.7500 -31.2500 -30.7500 -30.2500 -29.7500 -29.2500 -28.7500 -28.2500 -27.7500 -27.2500 -26.7500 -26.2500 -25.7500 -25.2500 -24.7500 -24.2500 -23.7500 -23.2500 -22.7500 -22.2500 -21.7500 -21.2500 -20.7500 -20.2500 -19.7500 -19.2500 -18.7500 -18.2500 -17.7500 -17.2500 -16.7500 -16.2500 -15.7500 -15.2500 -14.7500 -14.2500 -13.7500 -13.2500 -12.7500 -12.2500 -11.7500 -11.2500 -10.7500 -10.2500 -9.75000 -9.25000 -8.75000 -8.25000 -7.75000 -7.25000 -6.75000 -6.25000 -5.75000 -5.25000 -4.75000 -4.25000 -3.75000 -3.25000 -2.75000 -2.25000 -1.75000 -1.25000 -0.750000 -0.250000 0.250000 0.750000 1.25000 1.75000 2.25000 2.75000 3.25000 3.75000 4.25000 4.75000 5.25000 5.75000 6.25000 6.75000 7.25000 7.75000 8.25000 8.75000 9.25000 9.75000 10.2500 10.7500 11.2500 11.7500 12.2500 12.7500 13.2500 13.7500 14.2500 14.7500 15.2500 15.7500 16.2500 16.7500 17.2500 17.7500 18.2500 18.7500 19.2500 19.7500 20.2500 20.7500 21.2500 21.7500 22.2500 22.7500 23.2500 23.7500 24.2500 24.7500 25.2500 25.7500 26.2500 26.7500 27.2500 27.7500 28.2500 28.7500 29.2500 29.7500 30.2500 30.7500 31.2500 31.7500 32.2500 32.7500 33.2500 33.7500 34.2500 34.7500 35.2500 35.7500 36.2500 36.7500 37.2500 37.7500 38.2500 38.7500 39.2500 39.7500 40.2500 40.7500 41.2500 41.7500 42.2500 42.7500 43.2500 43.7500 44.2500 44.7500 45.2500 45.7500 46.2500 46.7500 47.2500 47.7500 48.2500 48.7500 49.2500 49.7500 50.2500 50.7500 51.2500 51.7500 52.2500 52.7500 53.2500 53.7500 54.2500 54.7500 55.2500 55.7500 56.2500 56.7500 57.2500 57.7500 58.2500 58.7500 59.2500 59.7500 60.2500 60.7500 61.2500 61.7500 62.2500 62.7500 63.2500 63.7500 64.2500 64.7500 65.2500 65.7500 66.2500 66.7500 67.2500 67.7500 68.2500 68.7500 69.2500 69.7500 70.2500 70.7500 71.2500 71.7500 72.2500 72.7500 73.2500 73.7500 74.2500 74.7500 75.2500 75.7500 76.2500 76.7500 77.2500 77.7500 78.2500 78.7500 79.2500 79.7500 80.2500 80.7500 81.2500 81.7500 82.2500 82.7500 83.2500 83.7500 84.2500 84.7500 85.2500 85.7500 86.2500 86.7500 87.2500 87.7500 88.2500 88.7500 89.2500 89.7500 ********************************** The 'OMAERUV_GLOBAL_LNDWAT.sav' file contains the OMAERUV 'Land' and 'Water' mask flags. This database was derived using the two months (January and July 2007) of OMI 'GroundPixelQualityFlags' identifier associated with each pixel aggregated to 0.5 deg grid box. The spatial resolution of the land/water mask is 0.5 deg x 0.5 deg-same as the spatial dimensions of the OMAERUV monthly mean described above. Two values stored in each 0.5 deg box identifies whether the grid is ocean (value '0') or land (value '1'). IDL> RESTORE, 'OMAERUV_GLOBAL_LNDWAT.sav' IDL> HELP % At $MAIN$ OMAERUV_LNDWAT FLOAT = Array[720, 360] Compiled Procedures: $MAIN$ Compiled Functions: IDL>