QX/T 69-2024 in English
VALIDAerosol optical depth Sun photometer method
- Issued on:2024-08-16
- Implemented on:2024-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$219.00
| Standard No: | QX/T 69-2024 |
| Document status: | VALID |
| Title in English: | Aerosol optical depth Sun photometer method |
| Title in Chinese: | 气溶胶光学厚度 太阳光度计法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-08-16 |
| Implemented on: | 2024-12-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | optical depth measurement calculation method absorbing gas calculation
optical depth optical depth sun photometer method introduction core changes optical depth instrument requirements specific instrument parameters key term analysis aerosol |
Introduction
Core changes in the standard revision
| Comparison dimensions | 2007 version (QX/T69-2007) | 2024 version (QX/T69-2024) |
|---|---|---|
| Terminology | Includes 12 term definitions | Simplified to 4 core terms |
| Measurement objects | Atmospheric turbidity observations | Aerosol optical depth measurement |
| Calculation method | Absorbing gas calculation is not included | Added calculation of H2O/O3/NO2/CO2/CH4 optical depth |
| Instrument requirements | Technical indicators specified in Appendix C | Cancel specific instrument parameters |
Key term analysis
Aerosol optical depth (AOD): It indicates the degree of light attenuation by aerosol particles in a vertical air column. The calculation formula is:
τaero(λ)=[ln(aV0(λ)/V(λ))]/m(θ)-τR(λ)-τab(λ)
Where V(λ) is class=instrument>Sunlight meter measured signal value, m(θ) needs to be calculated through the solar zenith angle θ.
Atmospheric optical quality: Calculated using the Kasten-Young approximation formula:
m(θ)=1/[cosθ+0.15(93.885-θ)-1.253]
When θ=60°, m(θ)≈2.0
Technology evolution analysis
The 2024 version of the standard mainly reflects three major advances:
- Improved measurement accuracy: Added absorbing gas correction terms, especially the 936nm water vapor absorption band processing
- International integration: Adopted the AERONET network general algorithm (Giles et al., 2019)
- Application expansion: Supports aerosol particle size distribution inversion (via Ångström index α)
Implementation recommendations
Observation condition control: Strictly follow the clear sky condition, the solar zenith angle should be ≤75°
Instrument selection: It is recommended to use CE318 sun photometer (in line with QX/T270-2015 requirements)
Data processing: It is recommended to use the Langley method to calibrate V0(λ), and use OMI satellite data for the total ozone
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
QX/T 705-2023 in English
Technical Specifications for Division of Lightning-prone Areas
2023-12-30 -
QX/T 105-2009 in English
Code for supervision and acceptance of construction quality of lightning protection system
2009-06-07 -
QX/T 712-2024 in English
Climate Change Impact Assessment Food Crop Yield Vulnerability
2024-06-20 -
QX/T 41-2022 in English
air quality forecast
2022-01-07
