Dear Jonathan W., All,
Again finishing off a number of threads, the following names have been discussed and agreed. They are accepted for inclusion in the standard name table and will be added at the next update.
1) atmosphere_stability_total_totals_index (K)
'The atmosphere_stability_total_totals_index indicates the likelihood of severe convection and is often referred to as simply the total totals index. The index is derived from the difference in air temperature between 850 and 500 hPa (the vertical totals) and the difference between the dew point temperature at 850 hPa and the air temperature at 500 hPa (the cross totals). The vertical totals and cross totals are summed to obtain the index.'
2) atmosphere_stability_k_index (K)
'The atmosphere_stability_k_index is an index that indicates the potential of severe convection and is often referred to a simply the k index. The index is derived from the difference in air temperature between 850 and 500 hPa, the dew point temperature at 850 hPa, and the difference between the air temperature and the dew point temperature at 700 hPa.'
The showalter index proposal did not receive any specific comments, however the proposal was clearly designed to be consistent with the principles agreed under the other stability index discussion threads. For this reason, and because I am aware that "showalter index" is an established term, I think it is reasonable to accept this name also. It will be included in the next update.
3) atmosphere_stability_showalter_index (K)
'The atmosphere_stability_showalter_index is an index used to determine convective and thunderstorm potential and is often referred to as simply the showalter index. The index is defined as the temperature difference between a parcel of air lifted from 850 to 500 hPa (wet adiabatically) and the ambient air temperature at 500 hPa.'
Best wishes,
Alison
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Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
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Received on Wed Nov 06 2013 - 07:39:16 GMT
