This special issue serves as a collection point for papers describing the datasets collected and developed during the "Elucidating the role of clouds–circulation coupling in climate" (EUREC4A) field campaign. This campaign, which served as an organizing umbrella for various complementary efforts such as the Atlantic Tradewind Ocean–Atmosphere Mesoscale Interaction Campaign (ATOMIC), was conducted in January and February of 2020 and took place in and over the tropical Atlantic Ocean around Barbados. These efforts involved broad international participation and the deployment of a wide array of observational platforms, including several research vessels, manned and robotic research aircraft, autonomous ocean samplers, enhanced satellite observations, and land-based observational capabilities. In addition, several groups produced specialized forecasting tools in support of campaign planning, and several others are in the process of preparing forcing datasets for numerical experiments that bridge a variety of scales. This special issue is envisioned to include invited and contributed papers related to the datasets developed as part of EUREC4A, ATOMIC, and related activities.