Abstract
The National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data have been used to compute the moisture flux convergence (MFC) over Central Southwest Asia (CSWA) between 45°–75° E and 25°–40° N. The present study focuses on the 1969–2007 period, and both horizontal distributions and vertical profiles of MFC have been calculated and compared. Moisture is transported into the region from the west throughout the year. In this region, winter is the wettest season with the most precipitation. Areas of high moisture convergence are observed in the east and southwest. Moisture convergence in the east and southwest are associated with topographic effects. Our study also examined composites of moisture flux convergence that characterized the wettest and the driest years in this area. The magnitude of the monthly MFC differs considerably between these two extremes. The spatial distribution of moisture flux convergence during the recent drought period (1999–2001) was also examined in order to understand how moisture transport affects drought. Deficiency of precipitation during drought periods appears to be due to deviation of moisture transport away from the region.
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References
Agrawala S, Barnstone AG (2001). The drought and humanitarian crisis in Central and Southwest Asia: a climate perspective. 24
Alestalo M (1983). The atmospheric water budget over Europe. In: Variations in the global water budget. Reidel Publ. Co., Dordrecht, Holland., pp. 67–79
Barlow M, Cullen H, Lyon B (2002) Drought in central and southwest Asia: La Nina, the warm pool, and Indian Ocean precipitation. J Clim 15:697–700
Dinku T, Connor SJ, Ceccato PN, Ropelewski CF (2008) Comparison of global gridded precipitation products over a mountainous region of Africa. Int J Climatol 28:1627–1638
Elliot WP, Gaffen DJ (1991) On the utility of rawinsonde humidity archived for climate studies. Bull Am Meteorol Soc 72(10):1507–1520
Hoerling M, Kumar A (2003) The perfect ocean for drought. Science 299:691–694
Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven L, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Leetmaa A, Reynolds R (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471
Liu JL, Cho H, Steward RE (2002) Characteristics of the water vapour transport over the Mackenzie River basin during the 1994/95 water year. Atmosphere-Ocean 40(2):101–111
Martyn D (1992) Climates of the World. Elsevier, 1st edn. Amsterdam, Netherland, p 436
Peixoto JP (1973). Atmospheric water vapour flux computations for hydrological purposes. WMO, Geneva, 83
Pisharoty, Desai BN (1956) Western disturbances and Indian weather. Indian J Meteorol Geophys 7:333–338
Wang SH (2004): Large-scale moisture flux analysis for United States. Ph.D Thesis, Ohio State University/OhioLINK,172, p-29
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Malik, K.M., Taylor, P.A. & Szeto, K. Characteristics of moisture flux convergence in Central Southwest Asia. Theor Appl Climatol 120, 643–659 (2015). https://doi.org/10.1007/s00704-014-1192-1
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DOI: https://doi.org/10.1007/s00704-014-1192-1