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| Name | Last modified | Size | Description |
|---|---|---|---|---|
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| niamey_daily_dust.txt | 2008-10-03 13:10 | 263K | |
This page is intended to be used for gathering data metrics only. If you are trying to order current data, please login through the following link:
Browse and Order ARM AMF Niamey Dust Observations Data
Niamey aerosol are composed of two main components: dust due to the proximity of the Sahara Desert, and soot from local and regional biomass burning. The purpose of this data product is to identify when the local conditions are dominated by the dust component so that the properties of the dust events can be further studied. To identify the dominant presence of dust, a set of criteria were evaluated using observations from the Aerosol Observing System supported by a visibility sensor and an Multi-Filter Rotating Shadowband Radiometer:
Periods during which all the conditions 1-4 or conditions 1-3 and 5-6 are met are considered to be dominated by dust. To eliminate momentary data spikes and short-lived events such as gust fronts, we flag only those periods dominated by dust for several consecutive hours as dust events. A more complete description of this dataset is available in the fourth quarter 2008 science metric report http://www.arm.gov/science/metrics.stm>.
Data are reported n ASCII format as hourly averages. A summary file containing daily averages is also provided.
The files contain 78 columns of data as follows: Fieldname units longname/description --------------------- ---------------------- ------------------------------------------------------------ year yyyy year month mm month day dd day of month Hh hh hour of day UTC jday decimal year day of year (Jan 1 = 1) dust event unitless dust event flag (0 = not a dust event; 1 = dust event) Bsp_R_1um 1/Mm total scattering coefficient (dry), red, 1 um cut-off Bsp_G_1um 1/Mm total scattering coefficient (dry), green, 1 um cut-off Bsp_B_1um 1/Mm total scattering coefficient (dry), blue, 1 um cut-off Bsp_R_10um 1/Mm total scattering coefficient (dry), red, 10 um cut-off Bsp_G_10um 1/Mm total scattering coefficient (dry), green, 10 um cut-off Bsp_B_10um 1/Mm total scattering coefficient (dry), blue, 10 um cut-off Bbsp_R_1um 1/Mm backscattering coefficient (dry), red, 1 um cut-off Bbsp_G_1um 1/Mm backscattering coefficient (dry), green, 1 um cut-off Bbsp_B_1um 1/Mm backscattering coefficient (dry), blue, 1 um cut-off Bbsp_R_10um 1/Mm backscattering coefficient (dry), red, 10 um cut-off Bbsp_G_10um 1/Mm backscattering coefficient (dry), green, 10 um cut-off Bbsp_B_10um 1/Mm backscattering coefficient (dry), blue, 10 um cut-off Bap_R_1um 1/Mm absorption coefficient (dry), red, 1 um cut-off Bap_G_1um 1/Mm absorption coefficient (dry), green, 1 um cut-off Bap_B_1um 1/Mm absorption coefficient (dry), blue, 1 um cut-off Bap_R_10um 1/Mm absorption coefficient (dry), red, 10 um cut-off Bap_G_10um 1/Mm absorption coefficient (dry), green, 10 um cut-off Bap_B_10um 1/Mm absorption coefficient (dry), blue, 10 um cut-off SSA_R_1um unitless single-scattering albedo, red, 1 um cut-off SSA_G_1um unitless single-scattering albedo, green, 1 um cut-off SSA_B_1um unitless single-scattering albedo, blue, 1 um cut-off SSA_R_10um unitless single-scattering albedo, red, 10 um cut-off SSA_G_10um unitless single-scattering albedo, green, 10 um cut-off SSA_B_10um unitless single-scattering albedo, blue, 10 um cut-off bsf_R_1um unitless backscatter fraction , red, 1 um cut-off bsf_G_1um unitless backscatter fraction , green, 1 um cut-off bsf_B_1um unitless backscatter fraction , blue, 1 um cut-off bsf_R_10um unitless backscatter fraction , red, 10 um cut-off bsf_G_10um unitless backscatter fraction , green, 10 um cut-off bsf_B_10um unitless backscatter fraction , blue, 10 um cut-off g_R_1um unitless asymmetry parameter, red, 1 um cut-off g_G_1um unitless asymmetry parameter, green, 1 um cut-off g_B_1um unitless asymmetry parameter, blue, 1 um cut-off g_R_10um unitless asymmetry parameter, red, 10 um cut-off g_G_10um unitless asymmetry parameter, green, 10 um cut-off g_B_10um unitless asymmetry parameter, blue, 10 um cut-off Ang_Bs_BG_1um unitless Angstrom exponent for scattering, blue-green,1 um cut-off Ang_Bs_BR_1um unitless Angstrom exponent for scattering, blue-red,1 um cut-off Ang_Bs_GR_1um unitless Angstrom exponent for scattering, green-red,1 um cut-off Ang_Bs_BG_10um unitless Angstrom exponent for scattering, blue-green,10 um cut-off Ang_Bs_BR_10um unitless Angstrom exponent for scattering, blue-red,10 um cut-off Ang_Bs_GR_10um unitless Angstrom exponent for scattering, green-red,10 um cut-off Ang_Ba_BG_1um unitless Angstrom exponent for absorption, blue-green,1 um cut-off Ang_Ba_BR_1um unitless Angstrom exponent for absorption, blue-red,1 um cut-off Ang_Ba_GR_1um unitless Angstrom exponent for absorption, green-red,1 um cut-off Ang_Ba_BG_10um unitless Angstrom exponent for absorption, blue-green,10 um cut-off Ang_Ba_BR_10um unitless Angstrom exponent for absorption, blue-red,10 um cut-off Ang_Ba_GR_10um unitless Angstrom exponent for absorption, green-red,10 um cut-off subfrac_Bs_R unitless submicron fraction for scattering, red subfrac_Bs_G unitless submicron fraction for scattering, green subfrac_Bs_B unitless submicron fraction for scattering, blue subfrac_Ba_R unitless submicron fraction for absorption, red subfrac_Ba_G unitless submicron fraction for absorption, green subfrac_Ba_B unitless submicron fraction for absorption, blue CN_frac_ss_p5 unitless Ratio of CCN at 0.5% supersaturation to total CPC counts CN_frac_ss_p7 unitless Ratio of CCN at 0.7% supersaturation to total CPC counts CN_frac_ss_p9 unitless Ratio of CCN at 0.9% supersaturation to total CPC counts CN_frac_ss_1p2 unitless Ratio of CCN at 1.2% supersaturation to total CPC counts aod_415nm unitless MFRSR aod 415 nm, corrected for forward scattering aod_500nm unitless MFRSR aod 500 nm, corrected for forward scattering aod_615nm unitless MFRSR aod 615 nm, corrected for forward scattering aod_673nm unitless MFRSR aod 673 nm, corrected for forward scattering aod_870nm unitless MFRSR aod 870 nm, corrected for forward scattering Ang_aod_500_870 unitless MFRSR angstrom exponent from 500nm and 870nm aod twr_vis_10min km visibility from Vaisala sensor on met tower wind_spd m/s vector avg wind speed from tower wind_dir CW degrees from north vector avg wind direction from tower, measured clockwise from N=0. wind_N m/s component of windspeed from the north wind_E m/s component of windspeed from the east T_amb C Ambient temperature RH_amb % Ambient relative humidty atmos_pres hPa atmospheric pressure
Connor Flynn
connor.flynn@pnl.gov
509-375-2041