Combining crowd-sourcing and deep learning to understand meso-scale organization of shallow convection
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The discovery of new phenomena and mechanisms often begins with a scientist's intuitive ability to recognize patterns, for example in satellite imagery or model output. Typically, however, such intuitive evidence turns out to be difficult to encode and reproduce. Here, we show how crowd-sourcing and deep learning can be combined to scale up the intuitive discovery of atmospheric phenomena. Specifically, we focus on the organization of shallow clouds in the trades, which play a disproportionately large role in the Earth's energy balance. Based on visual inspection four subjective patterns or organization were defined: Sugar, Flower, Fish and Gravel. On cloud labeling days at two institutes, 67 participants classified more than 30,000 satellite images on a crowd-sourcing platform. Physical analysis reveals that the four patterns are associated with distinct large-scale environmental conditions. We then used the classifications as a training set for deep learning algorithms, which learned to detect the cloud patterns with human accuracy. This enables analysis much beyond the human classifications. As an example, we created global climatologies of the four patterns. These reveal geographical hotspots that provide insight into the interaction of mesoscale cloud organization with the large-scale circulation. Our project shows that combining crowd-sourcing and deep learning opens new data-driven ways to explore cloud-circulation interactions and serves as a template for a wide range of possible studies in the geosciences.
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