netcdf twpvisstpx04g09v3minnisX30.c1.20051031.002500 {
dimensions:
	time = UNLIMITED ; // (22330 currently)
	index = 21 ;
variables:
	int base_time ;
		base_time:string = "2005-10-31, 00:00:00 GMT" ;
		base_time:long_name = "base time in epoch" ;
		base_time:units = "seconds since 1970-1-1 0:00:00 GMT" ;
	double time_offset(time) ;
		time_offset:long_name = "Time offset from base_time" ;
		time_offset:units = "seconds since 2005-10-31 00:00:00 GMT" ;
	double time(time) ;
		time:long_name = "Time offset from midnight" ;
		time:units = "seconds since 2005-10-31 00:00:00 GMT" ;
	float image_times(index) ;
		image_times:long_name = "Image times offset from base time" ;
		image_times:units = "seconds since 2005-10-31 00:00:00 GMT" ;
	float image_start(index) ;
		image_start:long_name = "Image start index" ;
		image_start:usage = "Images are merged together. Individual images can be extracted using the image index fields as in the following IDL example for given image n:\n",
			"rv = reflectance_vis(image_start(n-1):image_start(n-1)+image_numpix(n-1)-1)" ;
	float image_numpix(index) ;
		image_numpix:long_name = "Number of pixels for each image" ;
	float latitude(time) ;
		latitude:valid_min = -90.f ;
		latitude:valid_max = 90.f ;
		latitude:long_name = "north latitude" ;
		latitude:units = "deg" ;
	float longitude(time) ;
		longitude:valid_min = -180.f ;
		longitude:valid_max = 180.f ;
		longitude:long_name = "east longitude" ;
		longitude:units = "deg" ;
	float reflectance_vis(time) ;
		reflectance_vis:valid_min = 0.f ;
		reflectance_vis:valid_max = 1.6f ;
		reflectance_vis:long_name = "Visible reflectance (0.65 um)" ;
		reflectance_vis:units = "unitless" ;
	float reflectance_nir(time) ;
		reflectance_nir:valid_min = 0.f ;
		reflectance_nir:valid_max = 1.6f ;
		reflectance_nir:long_name = "Near Infrared reflectance (1.6 um)" ;
		reflectance_nir:units = "unitless" ;
	float temperature_sir(time) ;
		temperature_sir:valid_min = 160.f ;
		temperature_sir:valid_max = 340.f ;
		temperature_sir:long_name = "Solar Infrared temperature (3.9 um)" ;
		temperature_sir:units = "K" ;
	float temperature_ir(time) ;
		temperature_ir:valid_min = 160.f ;
		temperature_ir:valid_max = 340.f ;
		temperature_ir:long_name = "Infrared Channel temperature (10.8 um)" ;
		temperature_ir:units = "K" ;
	float temperature_sw(time) ;
		temperature_sw:valid_min = 160.f ;
		temperature_sw:valid_max = 340.f ;
		temperature_sw:long_name = "Split-Window Channel temperature (11.9 um)" ;
		temperature_sw:units = "K" ;
	float broadband_shortwave_albedo(time) ;
		broadband_shortwave_albedo:valid_min = 0.f ;
		broadband_shortwave_albedo:valid_max = 150.f ;
		broadband_shortwave_albedo:long_name = "broadband SW albedo" ;
		broadband_shortwave_albedo:units = "%" ;
	float broadband_longwave_flux(time) ;
		broadband_longwave_flux:valid_min = 0.f ;
		broadband_longwave_flux:valid_max = 400.f ;
		broadband_longwave_flux:long_name = "broadband LW flux" ;
		broadband_longwave_flux:units = "W/m^2" ;
	float ir_cloud_emittance(time) ;
		ir_cloud_emittance:valid_min = 0.f ;
		ir_cloud_emittance:valid_max = 1.5f ;
		ir_cloud_emittance:long_name = "IR cloud emittance" ;
		ir_cloud_emittance:units = "unitless" ;
	int cloud_phase(time) ;
		cloud_phase:valid_min = 0 ;
		cloud_phase:valid_max = 7 ;
		cloud_phase:long_name = "cloud phase" ;
		cloud_phase:units = "unitless" ;
		cloud_phase:value_0 = "clear over snow/ice" ;
		cloud_phase:value_1 = "water" ;
		cloud_phase:value_2 = "ice" ;
		cloud_phase:value_3 = "no retrieval" ;
		cloud_phase:value_4 = "clear" ;
		cloud_phase:value_5 = "bad retrieval" ;
		cloud_phase:value_6 = "suspected water" ;
		cloud_phase:value_7 = "suspected ice" ;
	float visible_optical_depth(time) ;
		visible_optical_depth:valid_min = 0.f ;
		visible_optical_depth:valid_max = 128.f ;
		visible_optical_depth:long_name = "cloud optical depth" ;
		visible_optical_depth:units = "unitless" ;
	float particle_size(time) ;
		particle_size:valid_min = 0.f ;
		particle_size:valid_max = 150.f ;
		particle_size:long_name = "effective particle radius or diameter" ;
		particle_size:units = "microns" ;
		particle_size:value_1 = "If phase=1 (water), this parameter is radius." ;
		particle_size:value_2 = "If phase=2 (ice), this parameter is diameter." ;
	float liquid_water_path(time) ;
		liquid_water_path:valid_min = 0.f ;
		liquid_water_path:valid_max = 6000.f ;
		liquid_water_path:long_name = "Liquid or Ice Water Path" ;
		liquid_water_path:units = "g/m^2" ;
		liquid_water_path:value_1 = "NOTE: If phase is 1 (water), this is Liquid Water Path." ;
		liquid_water_path:value_2 = "NOTE: If phase is 2 (ice), this is Ice Water Path." ;
	float cloud_effective_temperature(time) ;
		cloud_effective_temperature:valid_min = 160.f ;
		cloud_effective_temperature:valid_max = 340.f ;
		cloud_effective_temperature:long_name = "Effective cloud temperature" ;
		cloud_effective_temperature:units = "K" ;
	float cloud_top_pressure(time) ;
		cloud_top_pressure:valid_min = 0.f ;
		cloud_top_pressure:valid_max = 1100.f ;
		cloud_top_pressure:long_name = "cloud top pressure" ;
		cloud_top_pressure:units = "hPa" ;
	float cloud_effective_pressure(time) ;
		cloud_effective_pressure:valid_min = 0.f ;
		cloud_effective_pressure:valid_max = 1100.f ;
		cloud_effective_pressure:long_name = "Effective cloud pressure" ;
		cloud_effective_pressure:units = "hPa" ;
	float cloud_bottom_pressure(time) ;
		cloud_bottom_pressure:valid_min = 0.f ;
		cloud_bottom_pressure:valid_max = 1100.f ;
		cloud_bottom_pressure:long_name = "cloud bottom pressure" ;
		cloud_bottom_pressure:units = "hPa" ;
	float cloud_top_height(time) ;
		cloud_top_height:valid_min = -0.1f ;
		cloud_top_height:valid_max = 20.f ;
		cloud_top_height:long_name = "cloud top height" ;
		cloud_top_height:units = "km" ;
	float cloud_effective_height(time) ;
		cloud_effective_height:valid_min = -0.1f ;
		cloud_effective_height:valid_max = 20.f ;
		cloud_effective_height:long_name = "cloud effective height" ;
		cloud_effective_height:units = "km" ;
	float cloud_bottom_height(time) ;
		cloud_bottom_height:valid_min = -0.1f ;
		cloud_bottom_height:valid_max = 20.f ;
		cloud_bottom_height:long_name = "cloud bottom height" ;
		cloud_bottom_height:units = "km" ;

// global attributes:
		:NetCDF_Version\  = "netCDF 3.5" ;
		:Title\  = "Pixel-level cloud products " ;
		:source = "NASA Langley Research Center" ;
		:version\  = "V3.0" ;
		:date\  = "VISST processed on 04/02/2010 10:10:16" ;
		:facility_id\  = "X1" ;
		:location\  = "dar" ;
		:data_level\  = "c1" ;
		:missing_value\  = "-9999." ;
		:history\  = "created by user mk on machine flux at Thu Apr 22 17:31:59 2010 UTC, using IDL 5.5" ;
		:input_files\  = "GOES-9" ;
		:reflectance_vis_note1 = "effective_wavelength_visst = 0.6383 um" ;
		:reflectance_vis_note2 = "spectral_width_instrument =  0.5230 um - 0.7440 um" ;
		:temperature_sir_note1 = "effective_wavelength_visst = 3.9129 um" ;
		:temperature_sir_note2 = "spectral_width_instrument = 3.7948 um - 4.0383 um" ;
		:temperature_ir_note1 = "effective_wavelength_visst = 10.7020 um" ;
		:temperature_ir_note2 = "spectral_width_instrument = 10.2333 um - 11.2158 um" ;
		:temperature_sw_note1 = "effective_wavelength_visst = 11.9961 um" ;
		:temperature_sw_note2 = "spectral_width_instrument = 11.5727 - 12.4797 um" ;
		:longwave_NB_BB_correlation = "The LW NB-BB correlation is given by Mbb=a+b*Mnb+c*Mnb*Mnb+dMnb*ln(colRH), where Mbb is the BB OLR(Wm-2), Mnb is the NB flux(Wm-2um-1), and colRH is the column weighted relative humidity(%) above the radiating surface.  The coefficients are, for ocean night: a=77.97,b=5.78,c=-0.01315,d=-0.35222,and day a=76.48,b=5.31,c=-0.00812,d=-0.31265; land night a=39.75,b=8.48,c=-0.04683,d=-0.040253; day a=52.27,b=6.67,c=-0.02759,d=-0.29062. The fit was derived from May05-Oct05 G9/CERES-Terra Ed2C fluxes over the Darwin domain. For land, the day RMS is 6.13Wm-2 (2.06%), night is 6.49Wm-2 (2.34%); for ocean, day 7.21 Wm-2 (2.69%), and night 7.58 Wm-2 (2.73%). The CERES limb-darkening function is used to convert NB rad to flux. These fluxes are preliminary. REFERENCE: Doelling,D.R, M.M.Khaiyer, and P.Minnis: 2003, Improved ARM-SGP TOA OLR Fluxes from GOES-8 IR Radiances based on CERES data, Proc. 13th Annual ARM Science Team Meeting, Boulder, CO, Mar31-Apr4, 2003.http://www.arm.gov/publications/proceedings/conf13/" ;
		:shortwave_NB_BB_correlation = "The shortwave narrowband to broadband correlation is given by Abb = a + b*Anb + c*Anb*Anb + d*ln(1/cos (SZA)), where Abb is the broadband albedo (fraction), Anb is the narrowband albedo (fraction) and SZA is the solar zenith angle (deg). The coefficients are land a=0.0437, b=0.8167, c=-0.05959, d=0.03145, and ocean a=0.0283, b=0.8079, c=-0.02425, d=0.02022. The relationship was derived from GOES-9 and CERES-Terra Ed2C fluxes May05-Oct05 over the Darwin domain and has a 0.0213 (14.95%) ocean albedo rms, and a .0123 (6.45%) land albedo rms. These fluxes are preliminary. REFERENCE: V. Chakrapani, D.R.Doelling, M.M. Khaiyer, and P.Minnis: 2003, New Visible to Broadband Shortwave Conversions for Deriving Albedos from GOES-8 Over the ARM SGP, Proc. of 13th Annual ARM Science Team Meeting, Boulder, CO, Mar31-Apr4, 2003. http://www.arm.gov/publications/proceedings/conf13/" ;
		:visible_calibration = "The GOES-9 visible calibration equation is Rad(0.65um) = (g0 + g1*d + g2*d*d)*(C-C0), where g0=0.419, g1=0.979e-4,g2=0,C= visible channel count, C0=is the visible channel offset, d is the number of days since reference. REFERENCE: Nguyen, L, D.R . Doelling, P. Minnis, J.K. Ayers, 2004, Rapid Technique to cross calibrate satellite imager with visible channels, Proc. of 49th SPIE Meeting, Denver, CO, Aug. 2-6, 2004.  http://www-pm.larc.nasa.gov/arm_refs.html#CPR" ;
		:IR_calibration = "The GOES-9 IR calibration was based on the nominal equations used in Mcidas and found at http://www.oso.noaa.gov/goes/goes-calibration/gvar-conversion.htm" ;
		:VISST = "NASA-Langley cloud and radiation products are produced using the VISST (Visible Infrared Solar-infrared Split-Window Technique), SIST (Solar-infrared Infrared Split-Window Technique) and SINT (Solar-infrared Infrared Near-Infrared Technique). The techniques use GOES-9 channels to detect clouds and retrieve cloud microphysics.  Atmospheric profiles are obtained from RUC. REFERENCE: Minnis, P., et al., 2001: A near-real time method for deriving cloud and radiation properties from satellites for weather and climate studies. Proc. AMS 11th Conf. Satellite Meteorology and Oceanography,Madison, WI, Oct.  15-18, 477-480. http://www-pm.larc.nasa.gov/arm_refs.html" ;
		:zeb_platform = "twpvisstdarpx04g09v3minnisX1.c1" ;
		:site_id = "twp" ;
		:DATA_VERSION_NOTE = "This version was processed historically and is an intermediate version.  The data will be reprocessed in the future and replaced. NOTE: GOES-9 data is known to have noise in the visible channel, which will affect the VISST results and SW fluxes. In order to address the noise issue in this version of the dataset, the median of each pixel and its 8 neighboring pixels was taken in the visible channel, prior to processing via VISST." ;
		:USERS_NOTE = "Users of the data for research leading to conference-level or peer-reviewed publications should contact Dr. Patrick Minnis (p.minnis@nasa.gov) before publishing any papers that include this data. The source of the data should be properly acknowledged and/or co-authorship should be offered depending on the level of documentation and contribution of the particular dataset. For any derived cloud, icing, and radiation products, it is in the best interest of individual researchers who use these datasets to ensure that they are using the latest and highest quality products available. Either Dr. Minnis or other group members can provide the proper references, caveats, or level of participation needed for any given request." ;
}