Tephigram Explained
A tephigram is one of a number of thermodynamic diagrams commonly used in weather analysis and forecasting. The name evolved from the original name "T-
-gram" to describe the axes of
temperature (T) and
entropy (
) used to create the plot.
[1] Usually, temperature and
dew point data from
radiosondes are plotted on these diagrams to allow calculations of
convective stability or
convective available potential energy (CAPE).
[1] Wind barbs are often plotted at the side of a tephigram to indicate the winds at different heights.
Description
The tephigram was invented by Napier Shaw in 1915 and is used primarily in the United Kingdom and Canada.[2] Other countries use similar thermodynamic diagrams for the same purpose however the details of their construction vary. In the tephigram, isotherms are straight and have a 45 degree inclination to the right while isobars are horizontal and have a slight curve. Dry adiabats are also straight and have a 45 degree inclination to the left while moist adiabats are curved.[1]
The main reason that tephigrams are used by the British Met Office, the Meteorological Service of Canada, and Met Éireann (Irish Meteorological Service) is the property that areas contained by the curves have equal energies for equal areas, leading to better comparisons of CAPE and hence convective systems.[1]
See also
References
- Web site: The Tephigram . . Meteorology and Climate Centre. M.Sc. in Meteorology. January 18, 2012.
- Heat Transfer within the Earth-Atmosphere System . pdf . Matthias . Hoeh . . 13 March 2006 .
Bibliography
- M.H.P. Ambaum, Thermal Physics of the Atmosphere, published by Wiley-Blackwell, April 16, 2010, 240 pages.
- R.R. Rogers and M.K. Yau, Short Course in Cloud Physics, Third Edition, published by Butterworth-Heinemann, January 1, 1989, 304 pages.
- J.V. Iribarne and W.L. Godson, Atmospheric Thermodynamics, 2nd Edition, published by D. Reidel Publishing Company, Dordrecht, Netherlands, 1981, 278 pages,,
External links
