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Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.7.4,hdf5=1.10.6
attribute NC_GLOBAL cdm_data_type String Trajectory
attribute NC_GLOBAL cdm_trajectory_variables String trajectory_id
attribute NC_GLOBAL comment String Concentrations of Al, Si, Ca, Ti, and Fe were determined by thin-film x-ray primary and secondary emission spectrometry [Feely et al., 1991; Feely et al., 1998].  The analysis was conducted by Chester LabNet in Tigard, OR.  Submicron samples were collected on Teflon filters (1.0 um pore size) mounted in a Berner impactor downstream of a D50,aero 1.1 um jet plate (Berner et al., 1979).  Sub 10 micron samples were collected on Teflon filters (1.0 um pore size) mounted in a Berner impactor downstream of a D50,aero 10 um jet plate. This method of sample collection allows for the sharp size cut of the impactor while collecting a thin film of aerosol necessary for the x-ray analysis.  Sampling periods ranged from 12 to 24 hours.  The reported Ca does not include sea salt Ca (as determined from soluble Na\r\n\r\nconcentrations and the ratio of Ca to Na in seawater).  Blank levels were determined by loading an impactor or filter pack with a filter but not drawing any air through it.\r\n\r\n\r\nConcentrations are reported as ug/m3 at STP (25C and 1 atm).\r\n\r\nThe mass concentrations of Al, Si, Ca, Fe, and Ti, the major elements in soil, were combined to calculate the concentration of dust. It was assumed that each element was present in the aerosol in its most common oxide form (Al2O3, SiO2, CaO, K2O, FeO, Fe2O3, TiO2). The measured elemental mass concentration was multiplied by the appropriate molar correction factor as follows:\r\n\r\n[Dust] = 2.2[Al] + 2.49[Si] + 1.63[Ca] + 2.42[Fe]+1.94[Ti]\r\n\r\n[Malm et al., 1994; Perry et al., 1997]. This equation includes a 16% correction factor to account for the presence of oxides of other elements such as K, Na, Mn, Mg, and V that are not included in the linear combination. In addition, the equation omits K from biomass burning by using Fe as a surrogate for soil K and an average K/Fe ratio of 0.6 in soil [Cahill et al., 1986].\r\n\r\nBerner et al., Sci. Total Environ., 13,  245 - 261, 1979.\r\n\r\nCahill, T.A., R.A. Eldred, and P.J. Feeney, Particulate monitoring and data analysis for the National Park Service, 1982 – 1985, University of California, Davis, 1986.\r\n\r\nFeely et al., Geophys. Monogr. Ser., vol. 63, AGU, Washington, DC, 251 - 257, 1991.\r\n\r\nFeely et al., Deep Sea Res., 45, 2637 - 2664, 1998.\r\n\r\nMalm, W.C., J.F. Sisler, D. Huffman, R.A. Eldred, and T.A. Cahill, Spatial and seasonal trends in particle concentration and optical extinction in the United States, J. Geophys. Res., 99, 1347-1370, 1994.\r\n\r\nPerry, K.D., T.A. Cahill, R.A. Eldred, D.D. Dutcher, and T.E. Gill, Long-range transport of North African dust to the eastern United States, J. Geophys. Res., 102, 11225- 11238, 1997.
attribute NC_GLOBAL contributor_name String Coffman, Derek;Johnson, James;Quinn, Patricia;Bates, Tim;Upchurch, Lucia
attribute NC_GLOBAL Conventions String CF-1.6, COARDS, ACDD-1.3
attribute NC_GLOBAL creator_email String james.e.johnson at noaa.gov
attribute NC_GLOBAL creator_name String Johnson, James
attribute NC_GLOBAL creator_url String https://saga.pmel.noaa.gov (external link)
attribute NC_GLOBAL date_created String 2020-11-30T17:21:22Z
attribute NC_GLOBAL Easternmost_Easting double -50.9607
attribute NC_GLOBAL featureType String Trajectory
attribute NC_GLOBAL geospatial_lat_max double 15.748
attribute NC_GLOBAL geospatial_lat_min double 13.1416
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -50.9607
attribute NC_GLOBAL geospatial_lon_min double -59.072
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL history String file created by NOAA/PMEL/ACG
attribute NC_GLOBAL infoUrl String https://saga.pmel.noaa.gov (external link)
attribute NC_GLOBAL institution String NOAA PMEL Atmospheric Chemistry
attribute NC_GLOBAL keywords String 1.1um, 10um, air, atmospheric, atomic, chemistry, collected, concentration, data, earth, environmental, fluorescence, identifier, impactor, laboratory, latitude, longitude, marine, mass, measured, midpoint, noaa, number, ocean, oceans, optical, optical properties, pacific, particles, period, pmel, properties, ray, sample, sample_number, science, sea, seawater, silicate, start, start_time, statistics, stop, stop_time, time, trajectory, trajectory_id, water, x-ray, xrf, XRF_Al_sub1, XRF_Al_sub10, XRF_Ca_sub1, XRF_Ca_sub10, XRF_Fe_sub1, XRF_Fe_sub10, XRF_Si_sub1, XRF_Si_sub10, XRF_Ti_sub1, XRF_Ti_sub10
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute NC_GLOBAL Northernmost_Northing double 15.748
attribute NC_GLOBAL platform String RHBrown
attribute NC_GLOBAL product_version String 1
attribute NC_GLOBAL project String ATOMIC
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 13.1416
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String trajectory_id
attribute NC_GLOBAL summary String ATOMIC (Atlantic Tradewind Ocean Atmosphere Mesoscale Interaction Campaign) 2020 Field campaign: Surface meteorological and ship navigation collected from the RV Ronald H. Brown by the National Oceanic and Atmospheric Administration (NOAA) Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group in the tropical North Atlantic ocean from 2020-01-09 to 2020-02-13
attribute NC_GLOBAL time_coverage_end String 2020-02-09T17:38:00Z
attribute NC_GLOBAL time_coverage_start String 2020-01-08T04:02:00Z
attribute NC_GLOBAL title String PMEL Atmospheric Chemistry ATOMIC Impactor collected XRF Chemistry
attribute NC_GLOBAL Westernmost_Easting double -59.072
attribute NC_GLOBAL Westernnmost_Easting double -59.072
variable time double
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.57845612E9, 1.58126988E9
attribute time axis String T
attribute time calendar String gregorian
attribute time colorBarMaximum double 1.582E9
attribute time colorBarMinimum double 1.578E9
attribute time ioos_category String Time
attribute time long_name String Midpoint Time of Sample Period
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable trajectory_id String
attribute trajectory_id cf_role String trajectory_id
attribute trajectory_id ioos_category String Identifier
attribute trajectory_id long_name String trajectory id
variable latitude double
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double -1.0E34
attribute latitude actual_range double 13.1416, 15.748
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude epic_code String 500
attribute latitude instrument String GPS
attribute latitude ioos_category String Location
attribute latitude long_name String Midpoint Latitude of Sample Period
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
attribute latitude valid_max double 90.0
attribute latitude valid_min double -90.0
variable longitude double
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double -1.0E34
attribute longitude actual_range double -59.072, -50.9607
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude epic_code String 502
attribute longitude instrument String GPS
attribute longitude ioos_category String Location
attribute longitude long_name String Midpoint Longitude of Sample Period
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
attribute longitude valid_max double 180.0
attribute longitude valid_min double -180.0
variable XRF_Al_sub1 double
attribute XRF_Al_sub1 _FillValue double -1.0E34
attribute XRF_Al_sub1 actual_range double 0.0, 1.47
attribute XRF_Al_sub1 epic_code String 1968
attribute XRF_Al_sub1 instrument String Impactor Dp<1.1um (5)
attribute XRF_Al_sub1 ioos_category String Unknown
attribute XRF_Al_sub1 long_name String Al Concentration in Dp < 1.1um  particles in air, measured by x-ray fluorescence
attribute XRF_Al_sub1 missing_value double -999.0
attribute XRF_Al_sub1 source String surface observation
attribute XRF_Al_sub1 uncertainty String +/- 10%
attribute XRF_Al_sub1 units String micrograms m-3
variable XRF_Al_sub10 double
attribute XRF_Al_sub10 _FillValue double -1.0E34
attribute XRF_Al_sub10 actual_range double 7.0E-4, 3.87
attribute XRF_Al_sub10 colorBarMaximum double 4.0
attribute XRF_Al_sub10 colorBarMinimum double 0.0
attribute XRF_Al_sub10 epic_code String 1970
attribute XRF_Al_sub10 instrument String Impactor Dp<10 (8)
attribute XRF_Al_sub10 ioos_category String Unknown
attribute XRF_Al_sub10 long_name String Al Concentration in Dp < 10um  particles in air, measured by x-ray fluorescence
attribute XRF_Al_sub10 missing_value double -999.0
attribute XRF_Al_sub10 source String surface observation
attribute XRF_Al_sub10 uncertainty String +/- 10%
attribute XRF_Al_sub10 units String micrograms m-3
variable XRF_Si_sub1 double
attribute XRF_Si_sub1 _FillValue double -1.0E34
attribute XRF_Si_sub1 actual_range double 0.0, 2.91
attribute XRF_Si_sub1 epic_code String 1974
attribute XRF_Si_sub1 instrument String Impactor Dp<1.1um (5)
attribute XRF_Si_sub1 ioos_category String Unknown
attribute XRF_Si_sub1 long_name String Si Concentration in Dp < 1.1um  particles in air, measured by x-ray fluorescence
attribute XRF_Si_sub1 missing_value double -999.0
attribute XRF_Si_sub1 source String surface observation
attribute XRF_Si_sub1 uncertainty String +/- 10%
attribute XRF_Si_sub1 units String micrograms m-3
variable XRF_Si_sub10 double
attribute XRF_Si_sub10 _FillValue double -1.0E34
attribute XRF_Si_sub10 actual_range double 3.0E-4, 7.54
attribute XRF_Si_sub10 colorBarMaximum double 8.0
attribute XRF_Si_sub10 colorBarMinimum double 0.0
attribute XRF_Si_sub10 epic_code String 1976
attribute XRF_Si_sub10 instrument String Impactor Dp<10 (8)
attribute XRF_Si_sub10 ioos_category String Unknown
attribute XRF_Si_sub10 long_name String Si Concentration in Dp < 10um  particles in air, measured by x-ray fluorescence
attribute XRF_Si_sub10 missing_value double -999.0
attribute XRF_Si_sub10 source String surface observation
attribute XRF_Si_sub10 uncertainty String +/- 10%
attribute XRF_Si_sub10 units String micrograms m-3
variable XRF_Ca_sub1 double
attribute XRF_Ca_sub1 _FillValue double -1.0E34
attribute XRF_Ca_sub1 actual_range double 0.0, 0.2228
attribute XRF_Ca_sub1 epic_code String 1977
attribute XRF_Ca_sub1 instrument String Impactor Dp<1.1um (5)
attribute XRF_Ca_sub1 ioos_category String Unknown
attribute XRF_Ca_sub1 long_name String Ca Concentration in Dp < 1.1um  particles in air, measured by x-ray fluorescence
attribute XRF_Ca_sub1 missing_value double -999.0
attribute XRF_Ca_sub1 source String surface observation
attribute XRF_Ca_sub1 uncertainty String +/- 10%
attribute XRF_Ca_sub1 units String micrograms m-3
variable XRF_Ca_sub10 double
attribute XRF_Ca_sub10 _FillValue double -1.0E34
attribute XRF_Ca_sub10 actual_range double 0.0393, 1.23
attribute XRF_Ca_sub10 colorBarMaximum double 1.5
attribute XRF_Ca_sub10 colorBarMinimum double 0.0
attribute XRF_Ca_sub10 epic_code String 1979
attribute XRF_Ca_sub10 instrument String Impactor Dp<10 (8)
attribute XRF_Ca_sub10 ioos_category String Unkown
attribute XRF_Ca_sub10 long_name String Ca Concentration in Dp < 10um  particles in air, measured by x-ray fluorescence
attribute XRF_Ca_sub10 missing_value double -999.0
attribute XRF_Ca_sub10 source String surface observation
attribute XRF_Ca_sub10 uncertainty String +/- 10%
attribute XRF_Ca_sub10 units String micrograms m-3
variable XRF_Ti_sub1 double
attribute XRF_Ti_sub1 _FillValue double -1.0E34
attribute XRF_Ti_sub1 actual_range double 0.0, 0.097
attribute XRF_Ti_sub1 epic_code String 1980
attribute XRF_Ti_sub1 instrument String Impactor Dp<1.1um (5)
attribute XRF_Ti_sub1 ioos_category String Unknown
attribute XRF_Ti_sub1 long_name String Ti Concentration in Dp < 1.1um  particles in air, measured by x-ray fluorescence
attribute XRF_Ti_sub1 missing_value double -999.0
attribute XRF_Ti_sub1 source String surface observation
attribute XRF_Ti_sub1 uncertainty String +/- 10%
attribute XRF_Ti_sub1 units String micrograms m-3
variable XRF_Ti_sub10 double
attribute XRF_Ti_sub10 _FillValue double -1.0E34
attribute XRF_Ti_sub10 actual_range double 0.0, 0.3001
attribute XRF_Ti_sub10 epic_code String 1982
attribute XRF_Ti_sub10 instrument String Impactor Dp<10 (8)
attribute XRF_Ti_sub10 ioos_category String Unknown
attribute XRF_Ti_sub10 long_name String Ti Concentration in Dp < 10um  particles in air, measured by x-ray fluorescence
attribute XRF_Ti_sub10 missing_value double -999.0
attribute XRF_Ti_sub10 source String surface observation
attribute XRF_Ti_sub10 uncertainty String +/- 10%
attribute XRF_Ti_sub10 units String micrograms m-3
variable XRF_Fe_sub1 double
attribute XRF_Fe_sub1 _FillValue double -1.0E34
attribute XRF_Fe_sub1 actual_range double 0.0, 0.8315
attribute XRF_Fe_sub1 epic_code String 1971
attribute XRF_Fe_sub1 instrument String Impactor Dp<1.1um (5)
attribute XRF_Fe_sub1 ioos_category String Unknown
attribute XRF_Fe_sub1 long_name String Fe Concentration in Dp < 1.1um  particles in air, measured by x-ray fluorescence
attribute XRF_Fe_sub1 missing_value double -999.0
attribute XRF_Fe_sub1 source String surface observation
attribute XRF_Fe_sub1 uncertainty String +/- 10%
attribute XRF_Fe_sub1 units String micrograms m-3
variable XRF_Fe_sub10 double
attribute XRF_Fe_sub10 _FillValue double -1.0E34
attribute XRF_Fe_sub10 actual_range double 0.002, 2.77
attribute XRF_Fe_sub10 colorBarMaximum double 3.0
attribute XRF_Fe_sub10 colorBarMinimum double 0.0
attribute XRF_Fe_sub10 epic_code String 1973
attribute XRF_Fe_sub10 instrument String Impactor Dp<10 (8)
attribute XRF_Fe_sub10 ioos_category String Unknown
attribute XRF_Fe_sub10 long_name String Fe Concentration in Dp < 10um  particles in air, measured by x-ray fluorescence
attribute XRF_Fe_sub10 missing_value double -999.0
attribute XRF_Fe_sub10 source String surface observation
attribute XRF_Fe_sub10 uncertainty String +/- 10%
attribute XRF_Fe_sub10 units String micrograms m-3
variable start_time double
attribute start_time actual_range double 1.57843452E9, 1.581204E9
attribute start_time calendar String gregorian
attribute start_time colorBarMaximum double 1.582E9
attribute start_time colorBarMinimum double 1.578E9
attribute start_time ioos_category String Time
attribute start_time long_name String Start Time of Sample Period
attribute start_time standard_name String time
attribute start_time time_origin String 01-JAN-1970 00:00:00
attribute start_time units String seconds since 1970-01-01T00:00:00Z
variable stop_time double
attribute stop_time actual_range double 1.57847772E9, 1.58133576E9
attribute stop_time calendar String gregorian
attribute stop_time colorBarMaximum double 1.582E9
attribute stop_time colorBarMinimum double 1.578E9
attribute stop_time ioos_category String Time
attribute stop_time long_name String Stop Time of Sample Period
attribute stop_time standard_name String time
attribute stop_time time_origin String 01-JAN-1970 00:00:00
attribute stop_time units String seconds since 1970-01-01T00:00:00Z
variable sample_number double
attribute sample_number _FillValue double -1.0E34
attribute sample_number actual_range double 1.0, 27.0
attribute sample_number colorBarMaximum double 100.0
attribute sample_number colorBarMinimum double 0.0
attribute sample_number ioos_category String Statistics
attribute sample_number long_name String Sample Number
attribute sample_number missing_value double -999.0
attribute sample_number units String 1

 
ERDDAP, Version 2.18
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