NO2 satellite retrievals biased by absorption in water
Labzovskii, L.D., van Geffen, J., Liu, M., van der A, R., de Laat, J.,
Leune, B., Eskes, H., Lin, X., Ding, J. and Richter, A.: 2024,
Nature Geoscience, 5 pp.
doi: 10.1038/s41561-024-01545-8
Abstract
Localized tropospheric nitrogen oxides (NOx=NO+NO2) are mostly formed
from emission sources, such as large cities, mineral mining sites, busy
transportation routes, fuel delivery infrastructure and wildfires.
Kong et al.
recently reported anomalous tropospheric NO2 columns from spaceborne
remote sensing observations of the TROPOspheric Monitoring Instrument
(TROPOMI) over Tibetan Plateau lakes and attributed them to megacity-scale
emissions from these lakes. Here we report serious anomalies in the NO2
retrievals over most of these lakes, possibly due to absorption in the
water, which may have biased the NO2 retrieval results. Without addressing
this potential absorption, it is premature to attribute any anomalies in
tropospheric NO2 to emissions from Tibetan lakes, let alone estimate their
magnitude.
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