1 / 8

The tephigram

The tephigram. Allows a radiosonde profile to be analysed for stability Allows calculations involving moisture content (e.g. saturated adiabatic lapse rate) to be performed graphically Is very confusing at first sight!. Basic idea. Plot temperature as x-axis and entropy as y

melodie
Download Presentation

The tephigram

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 tephigram • Allows a radiosonde profile to be analysed for stability • Allows calculations involving moisture content (e.g. saturated adiabatic lapse rate) to be performed graphically • Is very confusing at first sight!

  2. Basic idea • Plot temperature as x-axis and entropy as y • dS = cpdlnθ so we plot temperature versus lnθ

  3. Adding pressure Our measurements are of temperature and pressure, so we want to represent pressure on the plot. The curved lines are isopleths of constant pressure, in mb.

  4. Rotating plot and plotting profile The diagram is rotated through 45° so that the pressure lines are quasi-horizontal Temperature and Dew point are plotted on the diagram. Dew point is simply plotted as a temperature. Here:

  5. Adding Moisture information • Dew point is a measure of moisture content. The tephigram can be used to convert (TD,T) to mixing ratio • Mass mixing ratio isopleths are light dashed lines. Units are g kg-1 • Curved lines are saturated adiabats – the path a saturated parcel of air follows on adiabatic ascent

  6. Saturated adiabatic ConstantMixing ratio

  7. Example 1 Tropopause Inversion layer Saturated air (T = TD)

  8. Example 2 Tropopause Frontal Inversion layer

More Related