The dataset presents atmospheric mass loadings of black carbon (BC) and brown carbon (BrC), during the Surface Atmosphere Integrated Field Laboratory (SAIL) campaign that took place from 2021 – 2023 in Gothic, CO. A Magee Scientific aethalometer (model AE33) was deployed at the Rocky Mountain Biological Laboratory, 200 m north of AMF2 to monitor mass loadings of optically absorbing aerosols. The instrument inlet was equipped with a BGI SCC 1.829 ambient cyclone with a particle cutoff of 2.5 μm and placed 5 m above ground level. The dataset reports hour-resolved BC mass loadings at 370, 470, 520, 590, 660, 880, and 950 (BC370, BC470, BC 520, BC590, BC660, BC880, BC950 in ng/m3) reported by the instrument built-in algorithm, which calculates mass loadings from the rate of change of the attenuation of light transmitted through the aerosol-laden filter. BC880 is the operationally defined reference of the BC concentration. Hour-resolved absorbance at each wavelength were calculated from their respective mass absorption cross-section in inverse megameters (Mm-1). The absorption Angstrom exponent (AAE) for BrC and BC were calculated for each hour. BrC AAE (AAE_BrC) was calculated from the slope of Log(wavelength) versus Log(absorbance) based on the measurements at 370, 470, and 520 nm. BC AAE (AAE_BrC) was calculated from the slope of Log(wavelength) versus Log(absorbance) based on the measurements at 590, 660, 880, and 950 nm. The aethalometer record spans time periods of 4/5/2022 – 10/3/2022 and 12/8/2022 – 10/9/2023. The ambient CO2 concentration recorded by a Vaisala CARBOCAP carbon dioxide probe GMP343 is also reported in ppm.
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Metadata Creator:
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Name:
Steven Sharpe |
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Email:
sharpe22@purdue.edu |
Phone:
6412606980 |
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Street:
612 Columbia St |
City:
Lafayette |
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State:
IN |
Postal:
47901 |
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Contact Info:
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Name:
Steven Sharpe |
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Email:
sharpe22@purdue.edu |
Phone:
6412604082 |
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Street:
560 Oval Drive |
City:
West Lafayette |
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State:
IN |
Postal:
47907 |
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Investigator(s):
| Steven Sharpe (sharpe22@purdue.edu) 0000-0001-7927-2874
Temitope Olayemi (tolayemi@purdue.edu) 0009-0000-7805-2642
Ryan Moffet (rmoffet@sonomatech.com) 0000-0002-2352-5454
Alexander Laskin (alaskin@purdue.edu) 0000-0002-7836-8417
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| Data Citation: | https://doi.org/10.5439/2318726 |
| Data Format: | csv |
| File Naming Convention: | _- |
| Abstract: | The dataset presents atmospheric mass loadings of black carbon (BC) and brown carbon (BrC), during the Surface Atmosphere Integrated Field Laboratory (SAIL) campaign that took place from 2021 – 2023 in Gothic, CO. A Magee Scientific aethalometer (model AE33) was deployed at the Rocky Mountain Biological Laboratory, 200 m north of AMF2 to monitor mass loadings of optically absorbing aerosols. The instrument inlet was equipped with a BGI SCC 1.829 ambient cyclone with a particle cutoff of 2.5 μm and placed 5 m above ground level. The dataset reports hour-resolved BC mass loadings at 370, 470, 520, 590, 660, 880, and 950 (BC370, BC470, BC 520, BC590, BC660, BC880, BC950 in ng/m3) reported by the instrument built-in algorithm, which calculates mass loadings from the rate of change of the attenuation of light transmitted through the aerosol-laden filter. BC880 is the operationally defined reference of the BC concentration. Hour-resolved absorbance at each wavelength were calculated from their respective mass absorption cross-section in inverse megameters (Mm-1). The absorption Angstrom exponent (AAE) for BrC and BC were calculated for each hour. BrC AAE (AAE_BrC) was calculated from the slope of Log(wavelength) versus Log(absorbance) based on the measurements at 370, 470, and 520 nm. BC AAE (AAE_BrC) was calculated from the slope of Log(wavelength) versus Log(absorbance) based on the measurements at 590, 660, 880, and 950 nm. The aethalometer record spans time periods of 4/5/2022 – 10/3/2022 and 12/8/2022 – 10/9/2023. The ambient CO2 concentration recorded by a Vaisala CARBOCAP carbon dioxide probe GMP343 is also reported in ppm. |
| Purpose: | Hour-resolved records of black carbon absorption at seven wavelengths and total black carbon concentration at 880 nm. |
| Data Usage: | AE33 Codebook
Hour-resolved records of black and brown carbon absorption at seven wavelengths.
Peaks caused by instrument artifacts were removed
Col(1) DateTime: MM/DD/YYYY 24h 00:00 MST.
Col(2) DateTime: MM/DD/YYYY 24h 00:00 UTC. Calculated from Col(1)
Col(3-9) BCXXX: The values of ‘Black Carbon (BC)’ mass loading reported by the AE33 instruments at 370, 470, 520, 590, 660, 880, and 950 nm in ng/m^3. These values are calculated from measured absorbance and assume Mass Absorption Cross-section of BC (MACBC) at each of the wavelengths, which are 18.47, 14.54, 13.14, 11.58, 10.35, 7.77, and 7.19 m^2/g respectively.
BCXXX = AbsXXX/MACBCXXX,
Note that only BC880 value is used to reference the atmospheric concentration of BC. The values reported at other wavelengths are used for source apportionment. (For details see AE33 User's Manual, Ver. 1.56, 2018, p. 23-24)
Col(10) C02: Ambient carbon dioxide concentration in ppm. Recorded on Vaisala CARBOCAP Carbon Dioxide probe GMP343.
Col(11-17) AbsXXX: The values of absorbance at 370, 470, 520, 590, 660, 880, and 950 nm in units of inversed megameters (Mm-1). AbsXXX is the product of BCXXX and its corresponding MACBC multiplied by 10^-3. (AE33 User's Manual, Ver. 1.56, 2018, p. 23)
Col(18) AAE_BrC: Absorption Angstrom Exponent (AAE) of Brown Carbon (BrC) calculated as the slope of linear fit of Log(XXX) versus Log(AbsXXX) experimental records, based on 370, 470, and 520 nm datapoints for each hour.
Col(19) AAE_BC: Absorption Angstrom Exponent (AAE) of Black Carbon (BC) calculated as the slope of linear fit of Log(XXX) versus Log(AbsXXX) experimental records, based on 590, 660, 880, and 950 nm datapoints for each hour. |
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Arm Sites:
| guc |
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Other Sites:
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| Sites | North | West | South | East |
| M1: Gunnison, CO; AMF2 (main site for SAIL) | 38.956158 | -106.987856 | 38.956158 | -106.987856 |
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Content Time Range:
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Begin:
2022-04-05
End:
2023-10-09 |
| Instrument(s): | aethalometer
Continuous Carbon Dioxide
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| Data Type: | Aerosol Sampling During SAIL Campaign
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| Scientific Measurements(s): |
| Measurement name | Variables |
| Atmospheric black carbon mass loadings and CO2 measurements | BC370
BC470
BC520
BC590
BC660
BC880
BC950
CO2
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| Stratum Keyword(s): |
| Troposphere, aerosol, black carbon, brown carbon
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| Data Quality: |
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Attribute Accuracy:
| No formal uncertainty assessments were conducted and no estimates of uncertainty are reported. |
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Positional Accuracy:
| No formal positional accuracy tests were conducted |
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Consistency and Completeness Report:
| Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. |
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Factor Affecting the Research:
| Records related to instrument artifacts were removed. Gap in the record from 10/03/2022 - 12/8/2022 due to communication issues. |
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Use Restrictions:
| No use constraints are associated with this data. |
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Distribution Info:
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Organization Name: |
ARM Archive User Services
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Email:
armarchive[at]ornl.gov
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Phone:
1-888-ARM-DATA
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Street:
Oak Ridge National Laboratory
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City:
Oak Ridge
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State:
Tennessee
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Postal:
37831-6290
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