Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5 Relationships
Abstract
:1. Introduction
Methods for Estimating Surface PM2.5 from Satellite AOD
2. Data
2.1. Satellite AOD Product
2.2. Surface PM2.5
3. Methods
- We first used the level 2 AOD at 0.1 × 0.1-degree spatial resolution to match with the PM2.5 data from global point locations both in space and time. For simplicity, 24-h averaged PM2.5 values are collocated with daily AOD values. The spatial collocation is performed by selecting the nearest satellite grid to the surface monitor.
- Then we averaged the AOD data over 3 × 3 grids centered around the nearest grid to obtain an AOD value for a given day at a given PM2.5 locations. This way, we have spatial–temporal collocated AOD–PM2.5 data sets for 3352 ground monitors.
- We then present our results acquired at individual stations but grouped in 1 × 1 degree grids.
4. Results
5. Discussion and Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
References
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Region Number | Region | Number of Stations | Number of Pairs | R | m | c | Mean AOD | Mean PM2.5 |
---|---|---|---|---|---|---|---|---|
1 | North America | 1056 | 507,092 | 0.55 | 24.4 | 6.0 | 0.149 | 9.6 |
2 | Europe | 775 | 188,769 | 0.12 | 8.9 | 12.6 | 0.153 | 13.9 |
3 | Asia | 1508 | 159,440 | 0.49 | 55.0 | 33.0 | 0.435 | 57.0 |
4 | South America | 90 | 49,163 | 0.10 | 19.4 | 17.8 | 0.100 | 19.8 |
5 | Africa | 30 | 5728 | 0.56 | 65.4 | 7.9 | 0.265 | 25.0 |
6 | Australia | 61 | 15,237 | 0.55 | 45.2 | 3.9 | 0.091 | 8.0 |
Global | 3352 | 925,817 | 0.55 | 54.1 | 8.6 | 0.19 | 19.3 |
Season | Numbers of Stations | Numbers of Pairs | R | m | c | Mean AOD | Mean PM2.5 |
---|---|---|---|---|---|---|---|
DJF | 3321 | 175,387 | 0.65 | 81.8 | 14.1 | 0.20 | 30.6 |
MAM | 3432 | 230,443 | 0.62 | 62.0 | 5.5 | 0.19 | 17.6 |
JJA | 2127 | 242,477 | 0.46 | 22.5 | 7.3 | 0.22 | 12.2 |
SON | 3469 | 277,510 | 0.59 | 58.9 | 9.3 | 0.18 | 19.7 |
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Christopher, S.; Gupta, P. Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5 Relationships. Remote Sens. 2020, 12, 1985. https://doi.org/10.3390/rs12121985
Christopher S, Gupta P. Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5 Relationships. Remote Sensing. 2020; 12(12):1985. https://doi.org/10.3390/rs12121985
Chicago/Turabian StyleChristopher, Sundar, and Pawan Gupta. 2020. "Global Distribution of Column Satellite Aerosol Optical Depth to Surface PM2.5 Relationships" Remote Sensing 12, no. 12: 1985. https://doi.org/10.3390/rs12121985