gov.noaa.ncdc:C00030 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Unknown tabular digital data http://www.ncdc.noaa.gov Turbidity Data File is historical digital data set DSI-9789, archived at the National Climatic Data Center (NCDC). Atmospheric turbidity is a measurement of solar extinction by aerosols (suspension of insoluble particles in a gas) in the atmosphere. It gives an indication of the amount of particles in a certain size range in the column of air between the observer and the top of the atmosphere. This data set contains discrete observations of turbidity data taken at various times during the day at selected global stations during the years 1965-1994. Major parameters in the data set are sunphotometer wavelength (nanometers), calibration factors corresponding to the wavelengths of the sunphotometer, Tau values, diopter (air mass measurement), and meter value in nanometers. Other parameters are aerosol optical depths, corrected factor of mean sun-earth distance, visibility, obstructions to vision, dry bulb and dew point temperatures (Deg. C), wind direction (56 points) and speed (knots), sky cover (coded), temperature of recording device (Deg. C), station pressure (mb), calculated aerosol-optical depth (natural LO), true air mass values (calculated from the date, time, and location of the observation), and wavelength exponents. To make a wide range of climatic data available to researchers and the public. data set C00030 AIRBORNE TRACKING SUNPHOTOMETER ALTIMETERS ANEMOMETERS BAROMETERS PSYCHROMETERS SUN PHOTOMETERS TEMPERATURE SENSORS VISUAL OBSERVATIONS WIND VANES WEATHER STATIONS National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce 19650101 19941231 Ground Condition Complete As Needed -180.0 180.0 90.0 -90.0 ISO 19115 Topic Category climatologyMeteorologyAtmosphere 004 elevation 006 DIF Discipline Keyword Thesaurus Earth Sciences > Atmosphere > Meteorology Earth Sciences > Atmosphere > Climatology Earth Sciences > Atmosphere > Weather GCMD Sciences Keyword Valids EARTH SCIENCE > ATMOSPHERE > AEROSOLS > AEROSOL EXTINCTION EARTH SCIENCE > ATMOSPHERE > AEROSOLS > AEROSOL OPTICAL DEPTH/THICKNESS EARTH SCIENCE > ATMOSPHERE > AIR QUALITY > TURBIDITY EARTH SCIENCE > ATMOSPHERE > AIR QUALITY > VISIBILITY EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > SURFACE PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > TRANSMITTANCE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > DEW POINT EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD AMOUNT/FREQUENCY EARTH SCIENCE > SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS > THERMAL PROPERTIES EARTH SCIENCE > SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > SENSOR COUNTS EARTH SCIENCE > SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE FLUX GCMD Location Valids GLOBAL GCMD Location Valids TROPOSPHERE STRATOSPHERE WEATHER STATIONS SUN PHOTOMETERS WEATHER STATIONS AIRBORNE TRACKING SUNPHOTOMETER WEATHER STATIONS ANEMOMETERS WEATHER STATIONS WIND VANES WEATHER STATIONS PSYCHROMETERS WEATHER STATIONS ALTIMETERS WEATHER STATIONS BAROMETERS WEATHER STATIONS VISUAL OBSERVATIONS WEATHER STATIONS TEMPERATURE SENSORS 1 None None Not provided Unknown Completeness information not available. Not derived from another source. Unknown Element: Station number Positions: 1-5 Description: A unique 5-digit number assigned by NCDC to identify the station. Element: WMO Positions: 6-10 Description: A 5-digit WMO number identifying those stations that are WMO stations. Element: Station name Positions: 11-41 Description: A 31-character field giving the station name and country Element: Measurement units indicator Position: 42 Description: A code that identifies temperature and wind speed units: M - Centigrade, meters/sec. E - Fahrenheit, knots B - Centigrade, knots Element: Latitude (degrees, minutes) Positions: 43-46 Description: Degrees and minutes followed by N or S Element: N or S Position: 47 Element: Longitude (degrees, minutes) Positions: 48-52 Description: Degrees and minutes followed by E or W Element: E or W Position: 53 Element: Elevation (meters) Positions: 54-58 Element: Time zone (tenths) Positions: 59-62 Description: As politically determined and expressed in tenths (Example: India is time zone 5.5) Element: Meter number Positions: 63-67 Description: A 5-digit ID of the sunphotometer in use Element: Wavelength 1 Positions: 68-71 Description: Wavelengths measured by the sunphotometer Element: Wavelength 2 Positions: 72-75 Description: Wavelengths measured by the sunphotometer Element: Wavelength 3 Positions: 76-79 Description: Wavelengths measured by the sunphotometer Element: Wavelength 4 Positions: 80-83 Description: Wavelengths measured by the sunphotometer Element: Calibration 1 Positions: 84-89 Description: Calibration factors corresponding to the wavelengths of the instrument expressed in hundredths. The calibration factor is the energy the sunphotometer would measure if there were no atmosphere. Element: Calibration 2 Positions: 90-95 Description: Calibration factors corresponding to the wavelengths of the instrument expressed in hundredths. The calibration factor is the energy the sunphotometer would measure if there were no atmosphere. Element: Calibration 3 Positions: 96-101 Description: Calibration factors corresponding to the wavelengths of the instrument expressed in hundredths. The calibration factor is the energy the sunphotometer would measure if there were no atmosphere. Element: Calibration 4 Positions: 102-107 Description: Calibration factors corresponding to the wavelengths of the instrument expressed in hundredths. The calibration factor is the energy the sunphotometer would measure if there were no atmosphere. Element: Tau 1 Positions: 108-111 Description: The sum of the Rayleigh Scattering and Ozone Absorption Coefficients for the wavelength of the station. The values are derived from Elterman's Tables and are expressed in natural logs. Element: Tau 2 Positions: 112-115 Description: The sum of the Rayleigh Scattering and Ozone Absorption Coefficients for the wavelength of the station. The values are derived from Elterman's Tables and are expressed in natural logs. Element: Tau 3 Positions: 116-119 Description: The sum of the Rayleigh Scattering and Ozone Absorption Coefficients for the wavelength of the station. The values are derived from Elterman's Tables and are expressed in natural logs. Element: Tau 4 Positions: 120-123 Description: The sum of the Rayleigh Scattering and Ozone Absorption Coefficients for the wavelength of the station. The values are derived from Elterman's Tables and are expressed in natural logs. Element: Year Positions: 124-126 Description: Expressed in 3 digits; 1978 is stored as 978 Element: Month Positions: 127-128 Description: The 2-digit month number Element: Day Positions: 129-130 Description: The 2-digit calendar date of the month Element: Hour Positions: 131-132 Description: The 2-digit military hour Element: Minute Positions: 133-134 Description: The 2-digit military minute of the observation Element: Diopter (hundredths) Positions: 135-138 Description: The air mass for the time of observation as read from the instrument, in hundredths Element: Meter value 1 (tenths) Positions: 139-142 Description: The meter value from the instrument for the wavelength being measured, in tenths Element: Meter value 2 Positions: 143-146 Description: The meter value from the instrument for the wavelength being measured, in tenths Element: Meter value 3 Positions: 147-150 Description: The meter value from the instrument for the wavelength being measured, in tenths Element: Meter value 4 Positions: 151-154 Description: The meter value from the instrument for the wavelength being measured, in tenths Element: Observed Aerosol Optical Depth in Natural Logs 1 (thousandths) Positions: 155-158 Description: The turbidity value determined at the station by graph (nomogram), expressed in thousandths, of the natural log Element: Observed Aerosol Optical Depth in Natural Logs 2 (thousandths) Positions: 159-162 Description: The turbidity value determined at the station by graph (nomogram), expressed in thousandths, of the natural log Element: Observed Aerosol Optical Depth in Natural Logs 3 (thousandths) Positions: 163-166 Description: The turbidity value determined at the station by graph (nomogram), expressed in thousandths, of the natural log Element: Observed Aerosol Optical Depth in Natural Logs 4 (thousandths) Positions: 167-170 Description: The turbidity value determined at the station by graph (nomogram), expressed in thousandths, of the natural log Element: Sun-Earth distance (thousandths) Positions: 171-174 Description: The correction factor for the mean sun-earth distance, in thousandths Element: Visibility Positions: 175-176 Description: A 2-digit code specified by WMO code 4377 Element: Haze Position: 177 Description: A 1 indicates the presence of these obstructions to vision. A blank field indicated an obstruction is not present. Element: Smoke Position: 178 Description: A 1 indicates the presence of these obstructions to vision. A blank field indicated an obstruction is not present. Element: Fog Position: 179 Description: A 1 indicates the presence of these obstructions to vision. A blank field indicated an obstruction is not present. Element: Dry bulb temperature Positions: 180-182 Description: Whole degrees centigrade or Fahrenheit determined by the code in field 4 Element: Dew point temperature Positions: 183-185 Description: Same as dry-bulb temperature Element: Wind direction (tens of degrees) Positions: 186-187 Description: 2 digits expressed as tens of degrees. Element: Wind speed Positions: 188-189 Description: Whole knots or meters/sec. determined by the code in field 4 Element: Sky cover (tenths) Position: 190 Description: Tenths of total sky Element: Instrument temperature (whole Deg. C) Positions: 191-193 Description: Whole degrees centigrade Element: Station pressure (tenths of mbs) Positions: 194-198 Description: Tenths of millibars Element: Calculated Aerosol Optical Depth in Natural Logs 1 (thousandths) Positions: 199-203 Description: The turbidity value calculated from the time of observation and the meter value, expressed in ten thousandth, of natural logs for each wavelength measured. Element: Calculated Aerosol Optical Depth in Natural Logs 2 (thousandths) Positions: 204-208 Description: The turbidity value calculated from the time of observation and the meter value, expressed in ten thousandth, of natural logs for each wavelength measured. Element: Calculated Aerosol Optical Depth in Natural Logs 3 (thousandths) Positions: 209-213 Description: The turbidity value calculated from the time of observation and the meter value, expressed in ten thousandth, of natural logs for each wavelength measured. Element: Calculated Aerosol Optical Depth in Natural Logs 4 (thousandths) Positions: 214-218 Description: The turbidity value calculated from the time of observation and the meter value, expressed in ten thousandth, of natural logs for each wavelength measured. Element: Wavelength exponent (thousandths) Positions: 219-223 Description: None Element: Air mass (hundredths) Positions: 224-228 Description: The true air mass value calculated from the date, time, and location of the observation, in hundredths. Element: Blank field Positions: 229-232 Description: None Element: Flag - Air mass disagrees with Diopter Position: 233 Element: Flag - Aerosol Optical Depth out of range Position: 234 Element: Flag - Alpha out of range Position: 235 Element: Flag - Sun below horizon Position: 236 Element: Flag - Observed vs. Calculated Aerosol optical Depth Position: 237 Element: Flag - Observed vs. Calculated Mean Solar Distance Position: 238 Element: Flag - Dew point greater than Dry bulb Position: 239 Element: Blank Field Position: 240 None National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov DSI-9789 Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. 20060627 20060627 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata FGDC-STD-012-2002