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Remote Sensing of the Troposphere from Space. Seen from the International Space Station, this image high above northwestern Africa reveals the band of atmosphere surrounding Earth. Starting at Earth’s surface and extending upwards 8–14.5 km (5–9 miles), the troposphere is the densest part of the planet’s atmosphere, and the site where most of Earth’s weather occurs. The first satellite instrument specifically designed to observe tropospheric constituents was launched nearly 15 years ago, and since then scientists the world over have worked to observe and measure atmospheric pollutants, and understand their sources, interactions, and the effects of these pollutants on Earth’s ecosystems. One effort, described in “A Graduate-Level Online Module for Teaching Remote Sensing of Tropospheric NO2 from Space”, involves European colleagues training chemistry graduate students to validate and evaluate remote sensing data for chemical constituents in the troposphere. The e-learning module they devised is freely available online.
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