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zxdawn / S5P-LNO2

Core code for the TROPOMI lightning NO2 retrievals
GNU General Public License v3.0
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Swtich from apparent_scene_pressure to cloud_pressure #42

Closed zxdawn closed 2 years ago

zxdawn commented 2 years ago

After the discussion with Ronald van der A, the correct/accurate way to calculate VCD NO2 is using cloud pressure. https://github.com/zxdawn/S5P-LNO2/blob/91799f6c8f6c703ec85caa5da97a6524eaf4507f/main/s5p_lnox_link.py#L354

Besides, the lightning NO2 retrieval should use the customed AMF_LNO2 instead of using the ratio of integration.

https://github.com/zxdawn/S5P-LNO2/blob/91799f6c8f6c703ec85caa5da97a6524eaf4507f/main/s5p_lnox_link.py#L352-L372

zxdawn commented 2 years ago

We can calculate the AMF_LNO2 in this way by assuming the lightning NO2 occupies the most portion of NO2, especially with the cloudy condition (f_r ~ 1): image

The advantage is that the shape of a priori LNO2 profile can be used no matter the absolute profile values.