1 / 5

Understanding the Thermal Connection: Principles and Thermometer Types

This guide explores the thermal connection between the ground and air, focusing on how temperature is influenced by kinetic energy. It covers important thermometer types, including liquid-in-glass, resistance-based, and bimetallic thermometers, and emphasizes the critical placement of these instruments—ideally at six feet above ground level (AGL) to minimize temperature drift. The thermal dynamics of insolation warming the ground and air are discussed, alongside the daily and annual temperature variations influenced by geographic factors and seasonal changes.

truda
Télécharger la présentation

Understanding the Thermal Connection: Principles and Thermometer Types

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Thermal Connection • Physical Principle • Temp proportional to kinetic energy (1/2mv2) • Thermometers measure themselves • must be protected/shade - at six feet AGL (2m) • type of thermometers: • liquid in glass (Hg,alcohol) • resistance based (change in current flow prop to T) • bimetallic (thermostats) • Placement is critical! • Temperature drift is almost always upward

  2. The Thermal Connection • Insolation warms the ground • The ground heats the air • by conduction (direct contact) • by convection (bubbles of warm air) • The air is heated from below (by IR out) • maximum temp at surface • The air absorbs UV from above • second max in temp in stratosphere • see vertical profile of atmospheric temperature

  3. The Thermal Connection

  4. The Thermal Connection

  5. Daily Temperature diurnal cycle min in am / max in pm amplitude of cycle amount of insolation sun angle/day length latitude (low - constant) (mid & hi - varies) continent vs. maritime soil/vegetation type lag due to balance of incoming vs. outgoing Annual Temperature varies with seasons Low latitudes - small changes (due to wet/dry season) Mid latitudes - larger changes (due to coast vs inland) Hi latitudes - largest changes where most continental Lag due to heat capacity differences The Thermal Connection

More Related