Title: INDOEX: Maldives KCO Aerosol Optical Properties Contact: John A. Ogren NOAA Climate Monitoring and Diagnostics Laboratory (CMDL) 325 Broadway R/E/CG1 Boulder, CO 80303, USA Phone: (303)497-6210 Fax: (303)497-5590 Email: jogren@cmdl.noaa.gov Web: http://www.cmdl.noaa.gov/aerosol/ Data Set Description: CMDL aerosol data file Format Specifications [v2.51] * This document describes the file formats used to store aerosol data at CMDL. There are three basic types of files: ambient aerosol, ambient meteorology, and sampling system state. * All data files are plain ASCII text, in comma-separated, fixed-length fields. The end of a record is denoted by a linefeed character (ASCII hex 10), which optionally may be preceded by a carriage return. * Basic aerosol data file record format: (stations with minimal instrumentation may truncate the records at the point where no additional data are available). Leading plus signs are replaced with a blank. This is the common format for the basic measurements obtained at a high time resolution. Missing value codes are always positive. For stations where a particular instrument is not present, the corresponding data field may be either empty or contain the missing value code for that parameter. * Separate data and header files are used for each type of data. The data fields for ambient data are identical for all stations (although truncated records may be used for stations with limited instrumentation), while different data fields may be used in the sampling system state files from the various stations. There may even be several different types of sampling system state files for some sites. * The first line in the header file identifies the parameter in each data field. Subsequent lines in the header files contain instrument and sampling system specifications (model/serial number, wavelengths, particle size ranges), along with a time-stamp indicating when the specifications became effective. * A flags field is used in ambient aerosol data files to indicate sampling conditions and data processing status. * Aerosol light scattering and light absorption coefficients are reported relative to a particular temperature and pressure, either ambient or standard temperature (273.15K) and pressure. An STP correction bit in the flags field is used to denote which reference case is used. Naming Convention ----------------- File names consist of content, status, time codes, and station identifiers. The general format is: . is a two character (with the exception of "volumes") File Code that indicates the general content. File-Code General content --------------------------- a_ aerosol data ad aerosol digital data af aerosol filter data am aerosol monitor data b_ UPS data bm UPS monitor records ft Filter sample time records h_ humidograph data lm CLAP monitor records m_ general monitor info me ambient meteorological data nc neph calibration results ne neph state errors nm neph monitor data nk neph span check data ns neph state data oc wet neph calibration results om wet neph monitor data ss seconds and samples per sample period volumes Weekly cumulative filter volume records is a one character Status Code indicating the processing state of the file Status-Code Data form ----------------------------------------- _ as high-resolution (usually minute) data e high resolution, edited data h, H as hourly averages d, D as daily averages m, M as monthly averages A "generic" average-formatted file t as 2-hour averages w as weekly averages is a string indicating time interval of contents Timecode Data Time Interval --------------------------------------------------------- X the most recently processed data (usually one day) cum "cumulative", variable interval Head no time interval - this is a header file w one week of year beginning with week Q one quarter of year beginning with quarter year d one day of year beginning with DOY m one month of year beginning with month is the three character station identifier (source of the data). Station ID Station location ----------------------------- bnd Bondville, Illinois, USA brw Barrow, Alaska, USA cpo Cheeka Peak, Washington, USA kco Kaashido Climate Observatory, Maldives kpo K'puszta Observatory, Hungary lar Laramie, Wyoming, USA mlo Mauna Loa Observatory, Hawaii, USA nwr Ward, Colorado, USA p-3 P3 flight sgp Southern Great Plains, Oklahoma smo American Samoa spo South Pole Observatory wsa Sable Island, Nova Scotia, Canada Field Separator --------------- All files currently have a comma as the field separator. Field definition ---------------- Each File Code, Status Code combination has a specific format, as described below: File: a__. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info. Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Flags 0011 4-character code representing %4s system status. 5 CN_control +/-9.999e-99 Aerosol number concentration %10.3e (cm-3) measured with CNC on "control" inlet 6 CN_ambient +/-9.999e-99 Aerosol number concentration %10.3e (cm-3) measured with CNC on "ambient" inlet 7 Bap_G +/-9.999e-99 Aerosol light absorption %10.3e coefficient (m-1), green channel. 8 Bsp_B +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), blue channel. 9 Bsp_G +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), green channel. 10 Bsp_R +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), red channel. 11 Bbsp_B +/-9.999e-99 Aerosol backwards-hemispheric %10.3e -or- light scattering coefficient Bsp_NIR (m-1), blue channel. For stations equipped with 4-wavelength nephelometers, this field is aerosol total light scattering coefficient (m-1), near infrared channel. 12 Bbsp_G +/-9.999e-99 Aerosol backwards-hemispheric %10.3e light scattering coefficient (m-1), green channel. 13 Bbsp_R +/-9.999e-99 Aerosol backwards-hemispheric %10.3e light scattering coefficient (m-1), red channel. 14 Neph_RH +/-999 Relative Humidity (percent) %4d inside nephelometer 15 Neph_T +/-99.9 Temperature (deg C) inside %5.1f nephelometer 16 Neph_P +/-9999.9 Pressure (hPa) inside %7.1f nephelometer 17 WS +/-99.9 Local wind speed (m s-1) %5.1f 18 WD +/-999 Local wind direction (degrees %4d True) File: ad_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 Time_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Flags 0011 4-character code representing %4s system status. 5 Analyzers_ON 0 1=analyzers ON, 0 = analyzers OFF %1d 6 Active_Filter 9 Valid filters are 1-8. If more %1d than one filter is active at any one time, or if no filters are active, this field is set to zero. 7 Filter_Error 999 0=no filter error %3d Otherwise, this field contains the decimal value of a byte composed of the status of each filter. Each filter is a bit (1=filter on, 0=filter off), and are organized such that position 0 (LSB) = filter 1, position 1 = filter 2, up to position 7 respectively. 8 Unused1 0 unused digital input %1d 9 Unused2 0 unused digital input %1d 10 Unused3 0 unused digital input %1d 11 Unused4 0 unused digital input %1d File: af_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 F_Monitor (string of String indicating filter change, %s variable and cumulative filter volume length) information. This string may contain embedded commas, spaces and/or tabs. File: am_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Q_filter_lpm +/-99.99 Instantaneous air quantity %6.2f through active filter (lpm) 5 Q_analyzer_lpm +/-99.99 Instantaneous air quantity %6.2f through analyzer (lpm) 6 Q_3_lpm +/-99.99 Instantaneous air quantity %6.2f through spare line 7 Q_4_lpm +/-99.99 Instantaneous air quantity %6.2f through spare line 8 Q_bypass_lpm +/-99.99 Instantaneous air quantity %6.2f through bypass line. 9 Q_CNdrier_lpm +/-99.99 Instantaneous air quantity %6.2f through CN drier line. 10 Q_CN_lpm +/-99.99 Instantaneous air quantity %6.2f through CN. 11 T_sample_degC +/-99.9 Temperature of current air %5.1f sample. (deg C) 12 T_stack_degC +/-99.9 Temperature of air through stack. %5.1f (deg C) 13 T_pumpbox_degC +/-99.9 Temperature inside pumpbox. (deg %5.1f C) 14 T_heater_deg C +/-99.9 Temperature of heating tape. (deg %5.1f C) 15 T_uMAC_degC +/-99.9 Temperature measured at mMAC %5.1f panel. (deg C) 16 dP_Pitot_hPa +/-9.999 DPressure across stack. (hPa) %6.3f 17 dP_Purge_hPa +/-999.9 DPressure across purge line. %6.1f (hPa) 18 dP_F1_hPa +/-999.9 DPressure across filter 1. (hPa) %6.1f 19 dP_F2_hPa +/-999.9 DPressure across filter 2. (hPa) %6.1f 20 dP_F3_hPa +/-999.9 DPressure across filter 3. (hPa) %6.1f 21 dP_F4_hPa +/-999.9 DPressure across filter 4. (hPa) %6.1f 22 dP_F5_hPa +/-999.9 DPressure across filter 5. (hPa) %6.1f 23 dP_F6_hPa +/-999.9 DPressure across filter 6. (hPa) %6.1f 24 dP_F7_hPa +/-999.9 DPressure across filter 7. (hPa) %6.1f 25 dP_F8_hPa +/-999.9 DPressure across filter 8. (hPa) %6.1f 26 V_uMAC_V +/-9.999 Line voltage supplying power to %6.3f mMAC. (volts) 27 RH_sample +/-999.9 Relative humidity of sample %6.1f 28 dP_neph_im_hPa +/-999.9 DPressure across neph impactor %6.1f valve (hPa) 29 dP_spare1 +/-999.9 DPressure spare1 (hPa) %6.1f 30 dP_spare2 +/-999.9 DPressure spare2 (hPa) %6.1f 31 T_rack ±99.9 Temperature inside the rack. (deg %5.1f C) 32 P_station +/-9999.9 station pressure (hPa) %7.1f File: b__. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 AC_Volts_In +/-999 AC Voltage supplying UPS %4d 5 AC_Volts_Out +/-999 AC Voltage UPS is supplying as %4d output 6 AC_Amps_Out +/-999.9 AC Amps UPS is currently supplying %6.1f 7 Batt_DC_amp +/-999.9 DC Amps of UPS Battery %6.1f 8 Batt_DC_V +/-999.9 DC Voltage of UPS Battery %6.1f 9 Frequency +/-999.9 Frequency of line supplying UPS %6.1f power (Hz) 10 UPS_Temp +/-999 Temperature inside UPS (deg C) %4d File: bm_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 B_Monitor (string of String containing an event report %s variable generated by the UPS program. This length) string may contain embedded spaces. File: ft_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 EndYear 1993 End Year of sample period %4d 3 EndTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) Endtime of sample period 4 StartYear 1993 Start Year of sample period %4d 5 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY %9.5f StartTime of sample period 6 Cum_sec 999999 Seconds elapsed during sampling %6d period. 7 Filter 9 Filter that is being sampled this %1d period File: h__. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID SGP 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Flags 0011 4-character code representing %4s system status 5 CN_control 99999.9 Aerosol number concentration %7.1f (cm-3) at ambient T&P, measured with CNC on "control" inlet. 6 CN_ambient 99999.9 Aerosol number concentration %7.1f (cm-3) at ambient T&P, measured with CNC on "ambient" inlet. 7 Bap_G 9999.99 Aerosol light absorption %7.2f coefficient (Mm-1), green channel. 8 RefBsp_B 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Ref. Neph. Blue channel 9 RefBsp_G 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Ref. Neph. Green channel 10 RefBsp_R 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Ref. Neph. red channel 11 RefBbsp_B 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Ref. Neph blue channel 12 RefBbsp_G 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Ref. Neph. green channel 13 RefBbsp_R 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Ref. Neph. red channel 14 WetBsp_B 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Hum. Neph. Blue channel 15 WetBsp_G 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Hum. Neph. Green channel 16 WetBsp_R 9999.99 Aerosol total light scattering %7.2f coefficient (Mm-1), Hum. Neph. red channel 17 WetBbsp_B 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Hum. Neph blue channel 18 WetBbsp_G 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Hum. Neph. green channel 19 WetBbsp_R 9999.99 Aerosol backwards-hemispheric %7.2f light scattering coefficient (Mm-1), Hum. Neph. red channel 20 RH_Inlet 999.9 Relative humidity (percent) at %5.1f inlet 21 T_Inlet 999.9 Temperature (deg C) at inlet. %5.1f 22 RH_refInlet 999.9 Relative humidity (percent) at %5.1f ref. nephelometer inlet 23 T_refInlet 999.9 Temperature (deg C) at ref. %5.1f nephelometer inlet. 24 RH_refNeph 999.9 Relative humidity (percent) %5.1f inside ref. nephelometer. 25 T_refNeph 999.9 Temperature (deg C) inside ref. %5.1f nephelometer. 26 RH_S1 999.9 Relative humidity (percent) of %5.1f humido. preheater. 27 T_S1 999.9 Temperature (deg C) of humido. %5.1f preheater. 28 RH_S2 999.9 Relative humidity (percent) of %5.1f humido. controller. 29 T_S2 999.9 Temperature (deg C) of humido. %5.1f controller. 30 RH_wetInlet 999.9 Relative humidity (percent) at %5.1f wet nephelometer inlet. 31 T_wetInlet 999.9 Temperature (deg C) at wet %5.1f nephelometer inlet. 32 RH_wetNeph 999.9 Relative humidity (percent) %5.1f inside of wet nephelometer. 33 T_wetNeph 999.9 Temperature (deg C) inside of wet %5.1f nephelometer. File: lm_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Q_clap_slpm +/-9.99 CLAP flow rate %5.2f 5 Tr 9.999 Transmittance %5.3f 6 I_sample 9999999 Sample Intensity %7d 7 I_ref 9999999 Reference Intensity %7d File: m__. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 M_Monitor (string of General system monitor notes and %s variable records. This string may contain length) embedded spaces and/or commas. File: me_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code. %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 T_ambient +/-99.9 local temperature (deg C) %5.1f 5 RH_ambient +/-999.9 local relative humidity (%) %6.1f 6 P_ambient +/-9999.9 local pressure (hPa) %7.1f 7 WS +/-99.9 local wind speed (m s-1) %5.1f 8 WD +/-999 local wind direction (degrees %4d True) 9 Visibility +/-999.9 local visibility (km) %6.1f 10 Weather 99 2-digit code for current weather, %2d "TI" value Type Intensity 0 none -- 1 unknown very light 2 drizzle light 3 rain moderate 4 snow heavy 5 hail very heavy 6 freezing unknown 7 freezing drizzle 8 freezing rain 11 Cloud_base_m 9999 height of lowest layer of cloud, %4d in meters above ground level 12 Opacity_layer1 99 opacity of lowest layer of cloud, %2d in 10th's 13 Opacity_total 99 opacity of total cloud cover, in %2d 10th's 14 Fog1 999 frequency of fog with LWC>0.05 %3d g/m3 (%) 15 Fog2 999 frequency of fog with LWC>0.15 %3d g/m3 (%) 16 Solar_flux 9999 broadband solar irradiance, W/m2 %4d File: nc_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 EndTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) of the end of the calibration. 4 Bsp_B_bkg +/-9.999e-99 Background blue (m-1) %10.3e 5 Bsp_G_bkg +/-9.999e-99 Background green (m-1) %10.3e 6 Bsp_R_bkg +/-9.999e-99 Background red (m-1) %10.3e 7 Bbsp_B_bkg +/-9.999e-99 Backscatter Background blue (m-1) %10.3e 8 Bbsp_G_bkg +/-9.999e-99 Backscatter Background green %10.3e (m-1) 9 Bbsp_R_bkg +/-9.999e-99 Backscatter Background red (m-1) %10.3e File: ne_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing Value info Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY %9.5f (January 1 = 1) 4 State 9999 Code representing %4s nephelometer system state 5 Code 9999999999999999 16 digit code indicating %16s nephelometer status (4 digits on TSI nephelometers) File: nm_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Press_hPa +/-9999.9 Pressure inside nephelometer. %7.1f (hPa) 5 Temp_K +/-999.9 Temperature inside nephelometer %5.1f (K) 6 Ref_green +/-9.999e-99 Nephelometer Green Reference (Hz) %10.3e 7 Lamp_neph_V +/-9.999e-99 Voltage supplying nephelometer %10.3e lamp (V) 8 Lamp_I_A +/-9.9 Current supplying nephelometer %4.1f lamp (A) 9 Neph_RH +/-99.9 Relative Humidity (%) inside neph %5.1f 10 T_inlet +/-999.9 Temperature of inlet air (K) %6.1f 11 Aux_BNC_in +/-999 BNC Auxiliary input (mV) %4d ...before format v2.0, these fields are: 8 Bkg_blue_1_m +/-9.999e-99 Background blue (m-1) %10.3e 9 Bkg_green_1_m +/-9.99e9-99 Background green (m-1) %10.3e 10 Bkg_red_1_m +/-9.99e9-99 Background red (m-1) %10.3e File: ns_. [same format as ne_.] File: oc_. [same format as nc_., but for second nephelometer] File: om_. [same format as nm_., but for second nephelometer] File: os_. [same format as ns_., but for second nephelometer] File: ss_. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 seconds +/-999 Elapsed seconds this sampling %4d period 5 samples +/-999 Number of samples taken this %4d sampling period File: volumes. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12345 DOY and FRACTIONAL_DOY (January 1 %9.5f = 1) 4 Volume_info (string) Sampling volume information. (may %s contain embedded tabs, spaces, and/or commas) File: a_[Ahmd].[average format] Averages reported in fields 5 through 22 are by default the geometric average, and a corresponding geometric standard deviation. If the corresponding "N" in field 44 through 58 is negative, the average and standard deviation for that measurement is arithmetic, not geometric. Also, arithmetic averaging is used to calculate the hourly average and 2-hourly average files. ----------------------------------------------------------------------------- Col Name Format and Description Scanf # Missing info Value Code (mvc) ----------------------------------------------------------------------------- 1 Station_ID WSA 3-character ID code %3s 2 Year 1993 Year %4d 3 StartTime_UTC 123.12 Integer part is Day of Year, %6.2f 1 = January 1. Fractional part is time at the start of the averaging interval, UTC. 4 Flags 0011 4-character code representing %4s system status. 5 CN_control +/-9.999e-99 Aerosol number concentration %10.3e (cm-3) at ambient T&P, measured with CNC on "control" inlet 6 CN_ambient +/-9.999e-99 Aerosol number concentration %10.3e (cm-3) at ambient T&P, measured (default size) with CNC on "ambient" inlet 7 Bap_G +/-9.999e-99 Aerosol light absorption %10.3e coefficient (m-1), green (default size) channel. 8 Bsp_B +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), blue channel. (default size) 9 Bsp_G +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), green (default size) channel. 10 Bsp_R +/-9.999e-99 Aerosol total light scattering %10.3e coefficient (m-1), red channel. (default size) 11 Bbsp_B +/-9.999e-99 Aerosol backwards-hemispheric %10.3e -or- light scattering coefficient Bsp_NIR (m-1), blue channel. For stations equipped with (default size) 4-wavelength nephelometers, this field is aerosol total light scattering coefficient (m-1), near infrared channel. 12 Bbsp_G +/-9.999e-99 Aerosol backwards-hemispheric %10.3e light scattering coefficient (default size) (m-1), green channel. 13 Bbsp_R +/-9.999e-99 Aerosol backwards-hemispheric %10.3e light scattering coefficient (default size) (m-1), red channel. 14 Neph_RH +/-999 Relative Humidity (percent) %4d inside nephelometer 15 CN_ambient, +/-9.999e-99 Aerosol number concentration %10.3e (alternate (cm-3) at ambient T&P, measured size) with CNC on "ambient" inlet 16 Bap_G, +/-9.999e-99 Aerosol light absorption %10.3e (alternate coefficient (m-1), green size) channel. 17 Bsp_B, +/-9.999e-99 Aerosol total light scattering %10.3e (alternate coefficient (m-1), blue channel. size) 18 Bsp_G, +/-9.999e-99 Aerosol total light scattering %10.3e (alternate coefficient (m-1), green size) channel. 19 Bsp_R, +/-9.999e-99 Aerosol total light scattering %10.3e (alternate coefficient (m-1), red channel. size) 20 Bbsp_B +/-9.999e-99 Aerosol backwards-hemispheric %10.3e -or- light scattering coefficient Bsp_NIR, (m-1), blue channel. For (alternate stations equipped with size) 4-wavelength nephelometers, this field is aerosol total light scattering coefficient (m-1), near infrared channel. 21 Bbsp_G, +/-9.999e-99 Aerosol backwards-hemispheric %10.3e (alternate light scattering coefficient size) (m-1), green channel. 22 Bbsp_R, +/-9.999e-99 Aerosol backwards-hemispheric %10.3e (alternate light scattering coefficient size) (m-1), red channel. 23 SD_CN_control +/-9.999e-99 Standard deviation of CN_control %10.3e data this period 24 SD_CN_ambient +/-9.999e-99 Standard deviation of CN_ambient %10.3e data this period 25 SD_Bap_G +/-9.999e-99 Standard deviation of Bap_G data %10.3e this period 26 SD_Bsp_B +/-9.999e-99 Standard deviation of Bsp_B data %10.3e this period 27 SD_Bsp_G +/-9.999e-99 Standard deviation of Bsp_G data %10.3e this period 28 SD_Bsp_R +/-9.999e-99 Standard deviation of Bsp_R data %10.3e this period 29 SD_Bbsp_B +/-9.999e-99 Standard deviation of Bbsp_B or %10.3e -or- Bsp_NIR data this period SD_Bsp_NIR 30 SD_Bbsp_G +/-9.999e-99 Standard deviation of Bbsp_G %10.3e data this period 31 SD_Bbsp_R +/-9.999e-99 Standard deviation of Bbsp_R %10.3e data this period 32 SD_Neph_RH +/-999 Standard deviation of Neph_RH %4d data this period 33 SD_CN_ambient, +/-9.999e-99 Standard deviation of CN_ambient %10.3e (alternate size) data this (alternate period size) 34 SD_Bap, +/-9.999e-99 Standard deviation of Bap %10.3e (alternate (alternate size) data this size) period 35 SD_Bsp_B, +/-9.999e-99 Standard deviation of Bsp_B %10.3e (alternate (alternate size) data this size) period 36 SD_Bsp_G, +/-9.999e-99 Standard deviation of Bsp_G %10.3e (alternate (alternate size) data this size) period 37 SD_Bsp_R, +/-9.999e-99 Standard deviation of Bsp_R %10.3e (alternate (alternate size) data this size) period 38 SD_Bbsp_B +/-9.999e-99 Standard deviation of Bbsp_B or %10.3e -or- Bsp_NIR (alternate size) data SD_Bsp_NIR, this period (alternate size) 39 SD_Bbsp_G, +/-9.999e-99 Standard deviation of Bbsp_G %10.3e (alternate (alternate size) data this size) period 40 SD_Bbsp_R, +/-9.999e-99 Standard deviation of Bbsp_R %10.3e (alternate (alternate size) data this size) period 41 N_CN_control +/-99999 Number of data points used in %6d computation 42 N_CN_ambient +/-99999 Number of data points used in %6d computation 43 N_Bap_G +/-99999 Number of data points used in %6d computation 44 N_Bsp_B +/-99999 Number of data points used in %6d computation 45 N_Bsp_G +/-99999 Number of data points used in %6d computation 46 N_Bsp_R +/-99999 Number of data points used in %6d computation 47 N_Bbsp_B +/-99999 Number of data points used in %6d -or- computation N_Bsp_NIR 48 N_Bbsp_G +/-99999 Number of data points used in %6d computation 49 N_Bbsp_R +/-99999 Number of data points used in %6d computation 50 N_Neph_RH +/-99999 Number of data points used in %6d computation 51 N_CN_ambient, +/-99999 Number of data points used in %6d (alternate computation size) 52 N_Bap_G, +/-99999 Number of data points used in %6d (alternate computation size) 53 N_Bsp_B, +/-99999 Number of data points used in %6d (alternate computation size) 54 N_Bsp_G, +/-99999 Number of data points used in %6d (alternate computation size) 55 N_Bsp_R, +/-99999 Number of data points used in %6d (alternate computation size) 56 N_Bbsp_B +/-99999 Number of data points used in %6d -or- computation N_Bsp_NIR, (alternate size) 57 N_Bbsp_G, +/-99999 Number of data points used in %6d (alternate computation size) 58 N_Bbsp_R, +/-99999 Number of data points used in %6d (alternate computation size) FLAGS Field Specification ------------------------- The flags field is the 4-character hexadecimal representation of a 16-bit integer. It is used in the a_, ad_, and h_ files. ----------------------------------------------------------------------------- Char./ Description Bit set (1) Bit clear (0) Hex Bit bit Pos. mask ----------------------------------------------------------------------------- 1 Project specific 1:3 0x8000 Not used yet 1:2 0x4000 Not used yet 1:1 0x2000 Not used yet 1:0 0x1000 Not used yet 2 Corrections applied to data 2:3 0x0800 Not used 2:2 0x0400 neph truncation corrections corrections not corrections applied applied PSAP spot size and 2:1 0x0200 calibration corrections corrections not corrections applied applied data not 2:0 0x0100 STP corrections data corrected corrected to to STP STP 3 Sampling conditions 3:3 0x0080 Not used 3:2 0x0040 Not used 3:1 PSAP filter transmittance < transmittance 0x0020 loading 0.7 (Bap data >= 0.7 less reliable) 3:0 Analyzer impactor Alternate size Default size 0x0010 state range range (valve closed) (valve open) 4 Sampling conditions 4:3 0x0008 Not used 4:2 Wind sector Wind speed or Local pollution control direction absent 0x0004 indicate local pollution is likely 4:1 Manual Local pollution Local pollution 0x0002 contamination present absent check 4:0 Automatic Local pollution Local pollution 0x0001 contamination present absent controller The default size range is defined to be the total from 0-10 mm aerodynamic diameter. The alternate size range is from 0-1 mm aerodynamic diameter. Data Notes: The most recent data have had the following corrections applied: (1) correction to STP (To=0 C) (2) loss correction through humidifier (89% of particles got through humdifier to wet neph) (3) bap values for CLAP transmission <0.5 have been set to missing value code (as per bond et al.) (4) CLAP spot size correction and scattering in CLAP filter (5) truncation correction for nephelometer, where the dry truncation correction is used to correct the wet scattering if the appropriate wet angstrom exponent can not be calculated (i.e., due to missing pmts) (6) records with CLAP transmission <0.7 are flagged, by setting bit 0x0020 in the flags field. More Information regarding the format descriptions can be found at: http://www.cmdl.noaa.gov/aero/data/datafmt.html. References: None.