MAO/AETH/S1 - Negative black carbon mass

The MAOS Aethalometer (model AE-31) is an older design that is known to exhibit 
sensitivity to sudden changes in cabin relative humidity. The origin of this oscillation is 
attributed to differences in the sample air stream relative humidity (which the sample filter 
channel is exposed to) compared to the cabin relative humidity (which the reference channel 
is exposed to). Since the Aethalometer is a difference [sample - reference] of a 
difference [current calculated black carbon mass from the previous calculated black carbon mass] 
this effect is exacerbated in high relative humidity areas, such as Manacapuru, Brazil, 
where an air conditioner is necessary to control the cabin temperature of this mobile lab 
(small cabin volume). In the present case, the Aethalometer is housed in the MAOS 
SeaTainer [20-ft x 8-ft x 8-ft] and the effects of changing relative humidity brought about by 
a cycling air conditioner will magnify this issue.

Employ a 15-minute running average

• Zero signal at 370 nm, 10 um size cut(ultraviolet_zero_signal_10um)
• Reference zero at 520 nm, 10 um size cut(green_ref_zero_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)
• base time in epoch(base_time)
• 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)