MAO/AETH/S1 - Black Carbon Wavelength

The MAOS Aethalometer converts measured optical attenuation due to aerosols deposited onto 
a filter at 7-wavelengths (880 nm, 700 nm, 565 nm, 520 nm, 470 nm, 430 nm, 370 nm) to a 
black carbon (BC) mass\ concentration (ng/m3). The utility of this multi-wavelength 
instrument is that it can readily distinguish the presence of black carbon (BC) from brown 
carbon (BrC) by taking advantage of the differing absorption Angstrom exponents for black 
carbon (α ≈1) and brown carbon (α ≈ 2 ? 4). However, the end user is 
reminded that when reporting BC concentration to use that value reported at 880 nm since 
only BC absorbs at this wavelength. It is also to be noted ?BC? mass concentrations 
reported at other wavelengths (most notably in the near UV where BrC absorbs) are for 
qualitative convenience in that the reported concentration does not mean that there is X ng/m3 of 
any organic species. For example, if the reported concentration at 370 nm is 2000 ng/m3 
and 1500 ng/m3 at 880 nm, the difference (500 ng/m3) is not how much organic species is 
present. It simply means that additional optical absorption is present that is of the same 
magnitude as if it were produced by the presence of 500 ng/m3 of BC. The seven- 
wavelength Aethalometer is particularly well-suited for identifying biomass burning events.

• Reference zero at 520 nm, 10 um size cut(green_ref_zero_10um)
• Zero signal at 370 nm, 10 um size cut(ultraviolet_zero_signal_10um)
• Bypass fraction at 430 nm, 1 um size cut(near_ultraviolet_bypass_fraction_1um)
• Beam signal at 370 nm, 10 um size cut(ultraviolet_beam_signal_10um)
• Bypass fraction at 565 nm, 1 um size cut(yellow_bypass_fraction_1um)
• Bypass fraction at 470 nm, 1 um size cut(blue_bypass_fraction_1um)
• Zero signal at 470 nm, 1 um size cut(blue_zero_signal_1um)
• Reference beam at 880 nm, 1 um size cut(near_infrared_ref_beam_1um)
• Black carbon mass load at 370 nm, 10 um size cut(bcm_ultraviolet_10um)
• Black carbon mass load at 520 nm, 1 um size cut(bcm_green_1um)
• Beam signal at 470 nm, 10 um size cut(blue_beam_signal_10um)
• Optical attenuation at 370 nm, 10 um size cut(ultraviolet_optical_attenuation_10um)
• Reference beam at 520 nm, 1 um size cut(green_ref_beam_1um)
• Reference zero at 430 nm, 10 um size cut(near_ultraviolet_ref_zero_10um)
• Zero signal at 520 nm, 10 um size cut(green_zero_signal_10um)
• Optical attenuation at 880 nm, 10 um size cut(near_infrared_optical_attenuation_10um)
• Optical attenuation at 880 nm, 1 um size cut(near_infrared_optical_attenuation_1um)
• Beam signal at 880 nm, 1 um size cut(near_infrared_beam_signal_1um)
• Reference beam at 700 nm, 10 um size cut(orange_ref_beam_10um)
• Optical attenuation at 470 nm, 1 um size cut(blue_optical_attenuation_1um)
• Beam signal at 520 nm, 1 um size cut(green_beam_signal_1um)
• Optical attenuation at 565 nm, 10 um size cut(yellow_optical_attenuation_10um)
• Beam signal at 700 nm, 1 um size cut(orange_beam_signal_1um)
• Reference beam at 430 nm, 1 um size cut(near_ultraviolet_ref_beam_1um)
• Zero signal at 370 nm, 1 um size cut(ultraviolet_zero_signal_1um)
• Bypass fraction at 430 nm, 10 um size cut(near_ultraviolet_bypass_fraction_10um)
• Optical attenuation at 700 nm, 1 um size cut(orange_optical_attenuation_1um)
• Optical attenuation at 470 nm, 10 um size cut(blue_optical_attenuation_10um)
• Beam signal at 520 nm, 10 um size cut(green_beam_signal_10um)
• Optical attenuation at 565 nm, 1 um size cut(yellow_optical_attenuation_1um)
• Bypass fraction at 565 nm, 10 um size cut(yellow_bypass_fraction_10um)
• Zero signal at 470 nm, 10 um size cut(blue_zero_signal_10um)
• Zero signal at 565 nm, 10 um size cut(yellow_zero_signal_10um)
• Beam signal at 565 nm, 10 um size cut(yellow_beam_signal_10um)
• Optical attenuation at 700 nm, 10 um size cut(orange_optical_attenuation_10um)
• Zero signal at 430 nm, 10 um size cut(near_ultraviolet_zero_signal_10um)
• Reference zero at 370 nm, 10 um size cut(ultraviolet_ref_zero_10um)
• Beam signal at 370 nm, 1 um size cut(ultraviolet_beam_signal_1um)
• Reference zero at 700 nm, 1 um size cut(orange_ref_zero_1um)
• Black carbon mass load at 370 nm, 1 um size cut(bcm_ultraviolet_1um)
• Zero signal at 700 nm, 1 um size cut(orange_zero_signal_1um)
• Bypass fraction at 520 nm, 10 um size cut(green_bypass_fraction_10um)
• Reference zero at 880 nm, 1 um size cut(near_infrared_ref_zero_1um)
• Black carbon mass load at 520 nm, 10 um size cut(bcm_green_10um)
• Beam signal at 430 nm, 10 um size cut(near_ultraviolet_beam_signal_10um)
• Black carbon mass load at 470 nm, 10 um size cut(bcm_blue_10um)
• Bypass fraction at 700 nm, 1 um size cut(orange_bypass_fraction_1um)
• Black carbon mass load at 430 nm, 1 um size cut(bcm_near_ultraviolet_1um)
• Reference beam at 370 nm, 1 um size cut(ultraviolet_ref_beam_1um)
• Zero signal at 880 nm, 1 um size cut(near_infrared_zero_signal_1um)
• Reference zero at 430 nm, 1 um size cut(near_ultraviolet_ref_zero_1um)
• Reference zero at 700 nm, 10 um size cut(orange_ref_zero_10um)
• Optical attenuation at 430 nm, 10 um size cut(near_ultraviolet_optical_attenuation_10um)
• Optical attenuation at 370 nm, 1 um size cut(ultraviolet_optical_attenuation_1um)
• Beam signal at 470 nm, 1 um size cut(blue_beam_signal_1um)
• Zero signal at 565 nm, 1 um size cut(yellow_zero_signal_1um)
• Reference beam at 430 nm, 10 um size cut(near_ultraviolet_ref_beam_10um)
• Bypass fraction at 470 nm, 10 um size cut(blue_bypass_fraction_10um)
• Reference beam at 520 nm, 10 um size cut(green_ref_beam_10um)
• Bypass fraction at 370 nm, 1 um size cut(ultraviolet_bypass_fraction_1um)
• Reference beam at 470 nm, 1 um size cut(blue_ref_beam_1um)
• Black carbon mass load at 700 nm, 10 um size cut(bcm_orange_10um)
• Zero signal at 520 nm, 1 um size cut(green_zero_signal_1um)
• Reference beam at 880 nm, 10 um size cut(near_infrared_ref_beam_10um)
• Optical attenuation at 520 nm, 1 um size cut(green_optical_attenuation_1um)
• Reference beam at 470 nm, 10 um size cut(blue_ref_beam_10um)
• Reference zero at 565 nm, 10 um size cut(yellow_ref_zero_10um)
• Bypass fraction at 520 nm, 1 um size cut(green_bypass_fraction_1um)
• Black carbon mass load at 565 nm, 1 um size cut(bcm_yellow_1um)
• Black carbon mass load at 880 nm, 1 um size cut(bcm_near_infrared_1um)
• Zero signal at 880 nm, 10 um size cut(near_infrared_zero_signal_10um)
• Reference beam at 700 nm, 1 um size cut(orange_ref_beam_1um)
• Zero signal at 700 nm, 10 um size cut(orange_zero_signal_10um)
• Reference zero at 370 nm, 1 um size cut(ultraviolet_ref_zero_1um)
• Reference zero at 565 nm, 1 um size cut(yellow_ref_zero_1um)
• Bypass fraction at 700 nm, 10 um size cut(orange_bypass_fraction_10um)
• Beam signal at 565 nm, 1 um size cut(yellow_beam_signal_1um)
• Black carbon mass load at 880 nm, 10 um size cut(bcm_near_infrared_10um)
• Reference beam at 370 nm, 10 um size cut(ultraviolet_ref_beam_10um)
• Black carbon mass load at 565 nm, 10 um size cut(bcm_yellow_10um)
• Reference zero at 470 nm, 1 um size cut(blue_ref_zero_1um)
• Beam signal at 880 nm, 10 um size cut(near_infrared_beam_signal_10um)
• Beam signal at 700 nm, 10 um size cut(orange_beam_signal_10um)
• Optical attenuation at 430 nm, 1 um size cut(near_ultraviolet_optical_attenuation_1um)
• Reference zero at 520 nm, 1 um size cut(green_ref_zero_1um)
• Black carbon mass load at 470 nm, 1 um size cut(bcm_blue_1um)
• Bypass fraction at 880 nm, 10 um size cut(near_infrared_bypass_fraction_10um)
• Bypass fraction at 880 nm, 1 um size cut(near_infrared_bypass_fraction_1um)
• Reference zero at 470 nm, 10 um size cut(blue_ref_zero_10um)
• Black carbon mass load at 430 nm, 10 um size cut(bcm_near_ultraviolet_10um)
• Reference beam at 565 nm, 1 um size cut(yellow_ref_beam_1um)
• Bypass fraction at 370 nm, 10 um size cut(ultraviolet_bypass_fraction_10um)
• Reference zero at 880 nm, 10 um size cut(near_infrared_ref_zero_10um)
• Beam signal at 430 nm, 1 um size cut(near_ultraviolet_beam_signal_1um)
• Optical attenuation at 520 nm, 10 um size cut(green_optical_attenuation_10um)
• Zero signal at 430 nm, 1 um size cut(near_ultraviolet_zero_signal_1um)
• Reference beam at 565 nm, 10 um size cut(yellow_ref_beam_10um)
• Black carbon mass load at 700 nm, 1 um size cut(bcm_orange_1um)

• (Raw data stream - documentation not supported)