Elemental Carbon Observed at a Peri-Urban Forest Site near the Seoul Metropolitan Area as a Tracer of Seasonal Haze Occurrence
Abstract
:1. Introduction
2. Experiment
2.1. Measurements
2.2. EC Tracer Method
2.3. Air Mass Back Trajectory Analysis
3. Results and Discussion
3.1. High OC and EC Concentration in Cold Months
3.2. Seasonal Variability in OC and EC
3.3. High SOC to OC Ratio in Warm Months
3.4. Chemical Characteristics of TRF Air Masses
3.5. Source Signatures of OC and EC
3.6. EC as a Tracer for Haze
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability
Conflicts of Interest
References
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Site (Type) | PM2.5 (μgC/m3) | OC (μgC/m3) | EC (μgC/m3) |
---|---|---|---|
This study, TRF (peri-urban) | - | 5.1 | 1.7 |
Seoul, South Korea (urban) | 30.6 | 5.9 | 1.2 |
Jeju, South Korea (background) | 18.6 | 2.9 | 0.8 |
Beijing, China (urban) | 93.8 | 14.0 | 4.1 |
Title | Total | Early Summer (May–June) | Summer (August–September) | Fall (October–November) | Winter (December–February) | Spring (March–April) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
All | Haze | Non-Haze | All | Haze | Non-Haze | All | Haze | Non-Haze | All | Haze | Non-Haze | All | Haze | Non-Haze | All | Haze | Non-Haze | |
Frequency of days | 280 | 136 | 144 | 49 | 41 | 16 | 41 | 5 | 36 | 52 | 15 | 37 | 89 | 48 | 41 | 49 | 35 | 14 |
OC (μgC/m3) | 5.1 | 6.6 | 3.5 | 4.9 | 5.5 | 3.4 | 2.5 | 3.3 | 2.4 | 3.3 | 4.6 | 2.7 | 6.7 | 7.9 | 4.9 | 6.2 | 6.9 | 4.1 |
EC (μgC/m3) | 1.7 | 2.1 | 1.3 | 1.8 | 1.9 | 1.5 | 1.4 | 1.3 | 1.4 | 1.4 | 2.0 | 1.1 | 1.9 | 2.3 | 1.4 | 1.8 | 2.1 | 1.0 |
OC/EC | 3.15 | 3.34 | 2.95 | 2.84 | 3.05 | 2.37 | 1.98 | 2.56 | 1.90 | 2.46 | 2.24 | 2.57 | 3.82 | 3.74 | 3.93 | 3.84 | 3.63 | 4.44 |
O3 (ppb) | 16.8 | 18.3 | 15.1 | 29.9 | 32.2 | 25.2 | 16.3 | 19.9 | 15.7 | 13.1 | 11.4 | 14. | 8.9 | 8.2 | 9.8 | 21.8 | 22.6 | 19.5 |
CO (ppb) | 407 | 480 | 323 | 379 | 402 | 332 | 217 | 268 | 209 | 362 | 504 | 287 | 511 | 581 | 424 | 410 | 430 | 357 |
SO2 (ppb) | 2.3 | 3.0 | 1.6 | 2.1 | 2.3 | 1.7 | 1.2 | 1.6 | 1.2 | 2.4 | 3.2 | 1.9 | 2.9 | 3.8 | 1.8 | 2.1 | 2.5 | 1.0 |
NOx (ppb) | 10.6 | 11.9 | 9.0 | 7.5 | 7.5 | 7.4 | 5.6 | 6.6 | 5.5 | 14.4 | 21.3 | 10.9 | 15.1 | 17.1 | 12.4 | 5.5 | 5.9 | 4.4 |
Temp. (°C) | 8.0 | 7.7 | 8.3 | 18.9 | 18.9 | 18.4 | 21.4 | 22.3 | 21.2 | 4.8 | 5.1 | 4.7 | −2.4 | −2.0 | −2.9 | 9.2 | 9.9 | 7.1 |
RH (%) | 83.4 | 82.9 | 84.0 | 82.3 | 79.5 | 87.9 | 95.3 | 95.7 | 95.3 | 84.3 | 89.0 | 81.6 | 83.0 | 85.6 | 77.3 | 76.2 | 77.4 | 73.8 |
Period | (OC/EC)primary | b | r2 | SOC (μgC/m3) | SOC/OC (%) |
---|---|---|---|---|---|
Early summer (May–Jun) | 0.83 | 0.36 | 0.61 | 3.37 | 70.8 |
Fall (Oct–Nov) | 0.80 | 0.20 | 0.55 | 1.92 | 60.1 |
Winter (Dec–Feb) | 1.90 | 0.12 | 0.83 | 3.05 | 45.9 |
Spring (Mar–Apr) | 1.66 | 0.38 | 0.84 | 3.18 | 51.2 |
Season | OC | EC | OC/EC | CO | SO2 | NOx | RH | Temp. |
---|---|---|---|---|---|---|---|---|
Early Summer | 1.62 | 1.24 | 1.29 | 1.21 | 1.35 | 1.02 | 0.90 | 1.03 |
Fall | 1.69 | 1.78 | 0.87 | 1.75 | 1.63 | 1.95 | 1.09 | 1.08 |
Winter | 1.70 | 1.68 | 0.95 | 1.37 | 2.15 | 1.38 | 1.11 | 1.49 |
Spring | 1.66 | 2.15 | 0.82 | 1.20 | 2.53 | 1.34 | 1.05 | 1.39 |
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Ham, J.; Suh, I.; Lee, M.; Kim, H.; Kim, S. Elemental Carbon Observed at a Peri-Urban Forest Site near the Seoul Metropolitan Area as a Tracer of Seasonal Haze Occurrence. Atmosphere 2021, 12, 1627. https://doi.org/10.3390/atmos12121627
Ham J, Suh I, Lee M, Kim H, Kim S. Elemental Carbon Observed at a Peri-Urban Forest Site near the Seoul Metropolitan Area as a Tracer of Seasonal Haze Occurrence. Atmosphere. 2021; 12(12):1627. https://doi.org/10.3390/atmos12121627
Chicago/Turabian StyleHam, Jeeyoung, Inseon Suh, Meehye Lee, Hyunseok Kim, and Soyoung Kim. 2021. "Elemental Carbon Observed at a Peri-Urban Forest Site near the Seoul Metropolitan Area as a Tracer of Seasonal Haze Occurrence" Atmosphere 12, no. 12: 1627. https://doi.org/10.3390/atmos12121627