Table 5.
Mean, standard deviation, maximum, and minimum values of the tropospheric column density of formaldehyde (HCHO) calculated during February 2019 and February 2020 over the BTH, Wuhan, SMA, and TMA regions. All units for the mean, max, and min values are in molecules/cm2.
| BTH |
Wuhan |
Seoul |
Tokyo |
|||||
|---|---|---|---|---|---|---|---|---|
| 2019 | 2020 | 2019 | 2020 | 2019 | 2020 | 2019 | 2020 | |
| Mean | 7.4E+15 | 6.5E+15 | 7.3E+15 | 6.5E+15 | 5.8E+15 | 4.5E+15 | 3.9E+15 | 3.5E+15 |
| Std. deviation | 3.7E+15 | 2.4E+15 | 3.7E+15 | 1.5E+15 | 1.3E+15 | 1.4E+15 | 1.2E+15 | 9.7E+14 |
| Max value | 2E+16 | 1.4E+16 | 2.6E+16 | 1.2E+16 | 1E+16 | 8.5E+15 | 7.9E+15 | 7.1E+15 |
| Min value | −4.3E+15 | −6.5E+15 | −1.1E+16 | 1.3E+14 | 2.6E+15 | −2.1E+14 | −3.7E+14 | −5.2E+13 |
| Percent change | −13.04 | −10.38 | −22.09 | −8.42 | ||||