Relationships between Low-Level Jet and Low Visibility Associated with Precipitation, Air Pollution, and Fog in Tianjin
Abstract
:1. Introduction
2. Data and Methods
2.1. Experiment Site and Data
2.2. Criteria of LLJ, Precipitation, Pollution, and Fog
3. Results and Discussion
3.1. Relationship between LLJ and Precipitation
3.2. Relationships between LLJ and Air Pollution as Well as Fog
3.2.1. Relationship between Southwesterly LLJs and Air Pollution
3.2.2. Relationship between Northerly or Southeasterly LLJs and Air Pollution
3.2.3. Relationship between Southeasterly LLJ and Fog
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Instrument | Mounting Height | Measurements | Sampling Interval | Accuracy |
---|---|---|---|---|
Automatic weather stations (DZZ6) | 2 m | Wind speed (ws), Wind direction, Temperature (T), Relative humidity (RH) | 5 min | ws: 0.1 m s−1 T: ±0.2 °C RH: ±3% |
Particulate Monitor (RP1405D, Thermo Fisher Scientific, Waltham, MA, USA) | 2 m | PM2.5 mass concentration | 1 h | 0.1 μgm−3 |
Rain gauge (5502, R. M. Young, Traverse City, MI, USA) | 0.7 m | Rainfall | 0.1 mm | |
Forward scatter visibility meter (MODEL6000, Belfort Instrument Co., Baltimore, MD, USA) | 2 m | Visibility | 1 min | ±10% |
System Parameter | Range of Values |
---|---|
Height range | 150–3630 m, 1350–4830 m, 2120–9080 m |
Vertical resolution | 120 m, 240 m, 240 m |
Observation time | 3–60 min |
Operating frequency and wave length | 1363 MHz, 220 mm |
Peak power | 10 kw |
Mean power | 200 w |
Beam | 5 |
Horizonal and vertical beam width | ~4°, ~4° |
Operating model | Low, medium, high |
Sampling frequency | 25 kHz, 12.5 kHz, 8.3 kHz, |
Beam direction | ±14.1° from vertical direction |
Gain | 33 B |
Instrument | Mounting Height | Measurements | Sampling Interval | Accuracy |
---|---|---|---|---|
Cup and vane anemometer (Changchun, China) | 15 levels a | Wind speed Wind direction | 20 s | 0.1 m s−1 |
Temperature and relative humidity probe (HMP45C, CAMPBELL, USA) | 15 levels a | Temperature Relative humidity | 20 s | T: ±0.2 °C RH: ±2% (0–90%) ±5% (90–100%) |
Sonic anemometer-thermometer (CSAT3, CAMPBELL, USA.) | 40, 80, 200 m | 3-D wind components Sonic virtual temperature | 0.1 s | u, v: < ±0.04 m s−1 w: < ±0.02 m s−1 : 0.01 °C |
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Ju, T.; Wu, B.; Wang, Z.; Liu, J.; Chen, D.; Zhang, H. Relationships between Low-Level Jet and Low Visibility Associated with Precipitation, Air Pollution, and Fog in Tianjin. Atmosphere 2020, 11, 1197. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111197
Ju T, Wu B, Wang Z, Liu J, Chen D, Zhang H. Relationships between Low-Level Jet and Low Visibility Associated with Precipitation, Air Pollution, and Fog in Tianjin. Atmosphere. 2020; 11(11):1197. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111197
Chicago/Turabian StyleJu, Tingting, Bingui Wu, Zhaoyu Wang, Jingle Liu, Dehua Chen, and Hongsheng Zhang. 2020. "Relationships between Low-Level Jet and Low Visibility Associated with Precipitation, Air Pollution, and Fog in Tianjin" Atmosphere 11, no. 11: 1197. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111197