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Tests With Separated Tables for Water Vapor Saturation Pressure Over Ice and Water. (2000)
BibTeX
@MISC{Ivarsson00testswith,
author = {Karl-ivar Ivarsson},
title = {Tests With Separated Tables for Water Vapor Saturation Pressure Over Ice and Water.},
year = {2000}
}
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Abstract
A modified water vapor saturation pressure table, containing both water vapor saturation pressure over ice and over water have been introduced in HIRLAM and compared to the reference table, where one single mixed table is used. Different aspects of how to use this new vapor saturation pressure table are treated in this report and two tests with it are presented. The best result is obtained when the water vapor saturation pressure for calculation of stratiform precipitation is somewhat different from that used for the cloud cover calculation. The most remarkable improvement is for the humidity analysis and for some of the near surface parameters in winter. The verification against soundings shows that the temperature and the dewpoint temperature are somewhat better in both summer and winter, but the effects of the quality of geopotential height and wind speed are small. The improvement of the dewpoint analysis is assumed be an effect of that the treatment of dewpoint is fully...
Keyphrases
water vapor saturation pressure ice separated table water vapor saturation pressure stratiform precipitation dewpoint analysis cloud cover calculation near surface parameter geopotential height different aspect remarkable improvement dewpoint temperature humidity analysis single mixed table reference table new vapor saturation pressure table wind speed
