ATMO 170A1 1st Edition Lecture 9Outline of Last Lecture I. Why is the sky blue? Why are sunsets orange/red/yellow?II. TransmissionIII. Halos and Rainbowsa. RefractionOutline of Current Lecture II. Daily Temperatures and Global Temperature Distributiona. Daytime b. NighttimeIII. Daily Temperature VariationsCurrent LectureDaily Temperature – Daytime- Direct radiation (Heats up the surface)→ Conduction (Heats up the lowest portion of the atmosphere) → Convection and Avection (Heats up the air about one km above the surface)- The highest measured temperature is at 4:00 PM – not at noon.Daily Temperature – Nighttime- Radiation from the earth cools the surface and cooling by avection. - The surface cools by emitting IR. - The lowest measured temperature is around 5:00-6:00 AM (right before the sunrise).- Temperature Inversion: Increases with height (winter night with winds).- During calm days and nights, there are very strong temperature differences between thesurface and the air (which causes mirages). These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Windy conditions tend to mix the atmosphere and the temperatures are more homogeneous (even). Daily Temperature Variations1. Clouds: They reflect incoming solar radiation (making days cooler) and they absorb longwave radiation (making nights warmer). In clear weather, there is a larger range in temperatures.2. Humidity: Humid regions have less of a temperature range.3. Urban Heat Island: Urban regions absorb solar radiation during the day. At night, urban regions are significantly warmer. Non-urban regions usually reflects more. UHI affects minimum temperatures primarily.
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