Characteristics of Turbulence and Aerosol Optical and Radiative Properties during Haze–Fog Episodes in Shenyang, Northeast China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Observational Site and Data
2.2. Calculations
2.3. Identification of Haze and Fog Events
3. Results
3.1. Overview of the Haze and Haze–Fog Mixed Episodes in Shenyang
3.2. Different Characteristics of the Haze and Haze–Fog Mixed Episodes
3.2.1. Relationships among PM2.5 Concentration, Visibility, and RH
3.2.2. Optical Properties of the Haze and Haze–Fog Mixed Episodes
3.2.3. Radiation Effects during the Haze and Haze–Fog Mixed Episodes
3.2.4. Turbulence Characteristics during the Haze and Haze–Fog Mixed Episodes
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
Symbols | Full Name |
Vis | visibility |
WS | wind speed |
WD | wind direction |
Ta | air temperature |
RH | relative humidity |
Pa | air pressure |
w | vertical velocity |
atmospheric structure constant of refractive index | |
σext | aerosol extinction coefficient |
σt | aerosol total scattering coefficient |
σb | aerosol backward scattering coefficient |
Rn | net radiation |
DSR | downward shortwave radiation |
USR | upward shortwave radiation |
DLR | downward longwave radiation |
ULR | upward longwave radiation |
u′ | fluctuation for horizontal latitudinal wind |
v′ | fluctuation for horizontal longitudinal wind |
w′ | fluctuation for vertical velocity |
TKE | turbulence kinetic energy |
u* | friction velocity |
PBL | planetary boundary layer |
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Station | Variable | Interval | Height (AGL) | Device | Accuracy/Resolution |
---|---|---|---|---|---|
NWS | Vis | 1 h | 2.8 m | DNQ1; Huayun, Beijing, China | Accuracy: ±10%, 10 m–10 km ± 15%, 10–35 km |
WS, WD, Ta, RH, Pa | 1 h | 2 m | ZQZ-CII Automatic weather station, Jiangsu Radio, Wuxi, China | Resolution: WS: 0.1 m s−1, WD: 3°, Ta: 0.1 °C, RH: 0.1%, Pa: 0.1 hPa | |
WS, WD, w, | 5 min | 0–10 km | TWP8-L, Beijing Metstar Radar Co. Ltd., Beijing, China | Resolution: WS: 0.2 m s−1, 0–60 m s−1; WD: 0.5°, 0–360° | |
σt and σb | 5 min | 1 m | Aurora3000, Ecotech, Melbourne, Australia | Resolution: <0.3 M m−1, 0.25–2000 M m−1 | |
IAE | σext | 5 min | 105 m–5 km | AGHJ-I-LIDAR; Wuxi CAS Photonics, Wuxi, China | Accuracy: <30%, 0–0.1 km−1 <10%, >0.1 km−1 |
Rn, DSW, USW, DLW, and ULW | 10 min | 60 m | NR-Lite, Kipp & Zonen, Delft, The Netherlands | Sensitivity: 10 μV/W/m2 for 40 °C~80 °C | |
u′, v′, w′ | 10 Hz | 60 m | CSAT3, Campbell Scientific, Inc., Logan, UT, USA | Resolution: 1 mm s−1 for u′ and v′ 0.5 mm s−1 for w′ |
Classification | Sub-Classification | Visibility | Relative Humidity | PM2.5 Concentration |
---|---|---|---|---|
Haze | <10 km | <80% | – | |
<10 km | 80–95% | >75 μg m−3 | ||
Fog | Clean fog | <1 km | >95% | ≤75 μg m−3 |
Polluted fog | <1 km | >95% | >75 μg m−3 | |
Haze–fog mixed episode | 1–10 km | >95% | – | |
<10 km | – | ≤75% |
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Li, X.; Ma, Y.; Wang, Y.; Lu, S.; Zhao, H.; Liu, N.; Hong, Y.; Wang, D. Characteristics of Turbulence and Aerosol Optical and Radiative Properties during Haze–Fog Episodes in Shenyang, Northeast China. Atmosphere 2021, 12, 1658. https://doi.org/10.3390/atmos12121658
Li X, Ma Y, Wang Y, Lu S, Zhao H, Liu N, Hong Y, Wang D. Characteristics of Turbulence and Aerosol Optical and Radiative Properties during Haze–Fog Episodes in Shenyang, Northeast China. Atmosphere. 2021; 12(12):1658. https://doi.org/10.3390/atmos12121658
Chicago/Turabian StyleLi, Xiaolan, Yanjun Ma, Yangfeng Wang, Shuo Lu, Hujia Zhao, Ningwei Liu, Ye Hong, and Dongdong Wang. 2021. "Characteristics of Turbulence and Aerosol Optical and Radiative Properties during Haze–Fog Episodes in Shenyang, Northeast China" Atmosphere 12, no. 12: 1658. https://doi.org/10.3390/atmos12121658