Empirical Modeling of Layered Integrated Water Vapor Using Surface Mixing Ratio in Nigeria

Adeyemi, B.
February 2009
Journal of Applied Meteorology & Climatology;Feb2009, Vol. 48 Issue 2, p369
Academic Journal
Using the available upper-air data for three stations in Nigeria (Lagos, a coastal station; Minna, an inland station; and Kano, a sub-Sahelian station), an intensive examination has been carried out on the linkage between surface mixing ratio rs and layered integrated water vapor W (g cm-2) over Nigeria. The goal was to identify the seasonal distribution of the parameter and to develop models that can best be used to estimate W from surface mixing ratio. To achieve these objectives, integrated water vapor at the low level (WL), midlevel (Wm), and upper level (Wu) and total column integrated water WT have been calculated using daily values of upper-air data spanning over a decade from the above three radiosonde stations. A relationship of the form W = αrs + β (where α and β are constants) has been established between W and rs using the analysis-of-variance (ANOVA) technique. Tests carried out on the models, using daily soundings made in 1990 for Lagos, 1983 for Minna, and 1991 for Kano, respectively, gave encouraging results as established by the use of Kolmogorov–Smirnov tests. Owing to the difference in the climatological patterns of precipitation among the different regions in Nigeria (i.e., southern, midland, and northern regions) as represented by the three stations, no single relationship was found to be suitable for the entire country of Nigeria. Earlier models, generally of the form W = αqb (where α and b are constants and q is specific humidity), were found to be less adequate over the stations.


Related Articles

  • Projections of annual mean air temperature and precipitation over the globe and in China during the 21st century by the BCC Climate System Model BCC_CSM1.0. Zhang, Li; Wu, Tongwen; Xin, Xiaoge; Dong, Min; Wang, Zaizhi // Acta Meteorologica Sinica;Jun2012, Vol. 26 Issue 3, p362 

    Evaluating the projection capability of climate models is an important task in climate model development and climate change studies. The projection capability of the Beijing Climate Center (BCC) Climate System Model BCC_CSM1.0 is analyzed in this study. We focus on evaluating the projected...

  • Diurnal Variation of Precipitable Water over a Mountainous Area of Sumatra Island. Wu, Peiming; Hamada, Jun-Ichi; Mori, Shuichi; Tauhid, Yudi I.; Yamanaka, Manabu D.; Kimura, Fujio // Journal of Applied Meteorology;Aug2003, Vol. 42 Issue 8, p1107 

    Diurnal variations in atmospheric water vapor at Koto Tabang, a mountainous area of Sumatra Island, Indonesia, are studied by analyzing the GPS-derived precipitable water, radiosonde data, and surface meteorological observation data. A permanent GPS receiving station was established at Koto...

  • Influences of the Sierra Nevada on Intermountain Cold-Front Evolution. West, Gregory L.; Steenburgh, W. James // Monthly Weather Review;Oct2011, Vol. 139 Issue 10, p3184 

    Recent studies indicate that strong cold fronts develop frequently downstream of the Sierra Nevada over the Intermountain West. To help ascertain why, this paper examines the influence of the Sierra Nevada on the rapidly developing Intermountain cold front of 25 March 2006. Comparison of a...

  • Hydrometeorological conditions of the Volga region and current climate changes. Anisimov, O.; Borzenkova, I.; Zhil'tsova, E.; Zakharova, O.; Kokorev, V.; Reneva, S.; Strel'chenko, Yu. // Russian Meteorology & Hydrology;May2011, Vol. 36 Issue 5, p307 

    The maps are presented of seasonal air temperature and precipitation amount anomalies averaged for the whole Volga region and adjacent territory for two time periods, 1946-1977 and 1978-2008. It is demonstrated that the considerable differences in the thermal and moistening regimes of the Volga...

  • NEKE ZNAÄŒAJKE KLIME OTOKA VISA. Krklec, Kristina; Lozić, Sanja; Perica, Dražen // Nase More;2012, Vol. 59 Issue 3/4, p148 

    Due to the geographical position of the island of Vis, its climate features are under the strong impact of the sea. The data analysed for the period between 1981. and 2009. show positive rising trend of mean annual air temperature and mean annual precipitation, and they are inversely...

  • Climatic features of the Belaya River runoff formation. Krasnogorskaya, N.; Fashchevskaya, T.; Golovina, A.; Ferapontov, Yu.; Zhdanova, N. // Russian Meteorology & Hydrology;Feb2012, Vol. 37 Issue 1, p57 

    Spatiotemporal regularities of changes in mean annual air temperature and annual precipitation amount values for the Belaya River basin were revealed on the basis of the analysis of statistical homogeneity of their long-term series. It is established that warming has occurred by now and the...

  • Weighting of model results for improving best estimates of climate change. Räisänen, Jouni; Ruokolainen, Leena; Ylhäisi, Jussi // Climate Dynamics;Aug2010, Vol. 35 Issue 2/3, p407 

    Climate projections from multi-model ensembles are commonly represented by the multi-model mean (MMM) climate change. As an alternative, various subjectively formulated schemes for performance-based weighting of models have been proposed. Here, a more objective framework for model weighting is...

  • Seasonal variations in the isotopic composition of near-surface water vapour in the eastern Mediterranean. ANGERT, ALON; JUNG-EUN LEE; YAKIR, DAN // Tellus: Series B;Sep2008, Vol. 60 Issue 4, p674 

    Although the isotopic composition of precipitation is widely used in global climate change studies, use of water vapour isotopes is considerably more limited. Here we present the results from 9 yr of atmospheric vapour measurements in the Eastern Mediterranean, at a site in Israel. The...

  • Secular trends in daily precipitation characteristics: greenhouse gas simulation with a coupled AOGCM. Semenov, V.; Bengtsson, L. // Climate Dynamics;Jun2002, Vol. 19 Issue 2, p123 

    Secular trends of daily precipitation characteristics are considered in the transient climate change experiment with a coupled atmosphere–ocean general circulation model ECHAM4/OPYC3 for 1900–2099. The climate forcing is due to increasing concentrations of the greenhouse gases in...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics