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SUMMARY:Data Drought in the Humid Tropics: How to Overcome the Cloud Barrier in Greenhouse Gas Remote Sensing
DESCRIPTION:Quantifying land-atmosphere fluxes of carbon-dioxide (CO2)
and methane (CH4) is essential for evaluating carbonclimate
feedbacks. Greenhouse gas satellite missions aim to
provide global observational coverage of greenhouse gas
concentrations and thus improve inversions of landatmosphere
exchange fluxes. However, in key regions such
as the humid tropics current missions obtain very few valid
measurements. Leveraging recent advances in the global
analysis of high-resolution optical imagery on cloudcomputing
platforms and deep learning algorithms for cloud
segmentation, we quantitatively diagnose the sources for
low data yields in the tropics. We find that the main cause for
low data yields are frequent shallow cumulus clouds. We
find that increasing the spatial resolution of observations to
200 m would increase yields by 2–3 orders of magnitude
and allow regular measurements in the wet season. Thus,
the key to effective tropical greenhouse gas observations
likely lies in regularly acquiring high-spatial resolution data.
LOCATION:
TRANSP:OPAQUE
URL:https://www.weizmann.ac.il/EPS/events
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