A Comparative Study Between Short Life- Cut off Low and Long Life-Cut off Low Accompanied by Heavy Precipitation Storms Over Iraq: Case Study
DOI:
https://doi.org/10.23851/mjs.v31i2.755Keywords:
(Long Life-Cut off low, Short Life-Cut off low, Omega block, Rex bloc)Abstract
A comparative study between Short Life Cut Off Low (SL-COL) extended for one day, and Long Life Cut Off Low (LL-COL) extended for ten days associated with successive rain storms over Iraq on 21 to 30 April, 2018. The study tracking the evolution stages of both COLs in different pressure surfaces at troposphere layer, and found that there are many dynamical processes effect on prolong the life of COL. These processes exchanged their roles between different pressure levels. In both cases the high potential vorticity (PV) anomaly at 315ᵒ K isentropic surface is responsible on the emergence COLs, and the convection processes at lower troposphere and latent heat at upper troposphere are responsible on COLs dissipation. The main reasons of long-life COL can be summaries as a high-pressure system below COL at the surface which preventing the convection process, the formation of Omega block that promoting the COL system and preventing its dissipation rapidly in spite of the intense convection processes due to tropical moist system at the surface.
Downloads
References
E. Palmén, and C. W. Newton, "Atmospheric Circulation Systems: Their Structure and Physical Interpretation", Academic, San Diego, Calif. 1969, 603 pp.
R. Nieto et al., "Interannual variability of cut-off low systems over the European sector: The role of blocking and the Northern Hemisphere circulation modes," Meteorol. Atmos. Phys., 2007.
K. Mohankumar and P. A. Pillai, "Stratosphere-troposphere interaction associated with biennial oscillation of Indian summer monsoon," J. Atmos. Solar-Terrestrial Phys., 2008. CROSSREF
A. A. Godoy, N. E. Possia, C. M. Campetella, and Y. García Skabar, "A cut-off low in southern South America: dynamic and thermodynamic processes," Rev. Bras. Meteorol., 2011. CROSSREF
G. Delgado et al., "Cloud cover analysis associated to cut-off low-pressure systems over Europe using Meteosat imagery," Meteorol. Atmos. Phys., 2007.
H. B. Bluestein, "Synoptic-dynamic meteorology in midlatitudes. Volume II: observations and theory of weather systems," Synop. Meteorol. midlatitudes. Vol. II Obs. theory Weather Syst., 1993.
A. S. Kentarchos and T. D. Davies, "A climatology of cut-off lows at 200 hPa in the northern hemisphere, 1990-1994," Int. J. Climatol., 1998. CROSSREF
S. Kentarchos and T. D. Davies, "A climatology of cut-off lows at 200 hPa in the northern hemisphere, 1990-1994," Int. J. Climatol., 1998. CROSSREF
J. L. Baray, S. Baldy, R. D. Diab, and J. P. Cammas, "Dynamical study of a tropical cut-off low over South Africa, and its impact on tropospheric ozone," Atmos. Environ., 2003. CROSSREF
R. Nieto et al., "Climatological features of cutoff low systems in the Northern Hemisphere," J. Clim., 2005. CROSSREF
F. Porcù, A. Carrassi, C. M. Medaglia, F. Prodi, and A. Mugnai, "A study on cut-off low vertical structure and precipitation in the Mediterranean region," Meteorol. Atmos. Phys., 2007.
D. P. Dee et al., "The ERA-Interim reanalysis: configuration and performance of the data assimilation system, " Q. J. R. Meteorol. Soc., 2011.
Downloads
Key Dates
Published
Issue
Section
License
(Starting May 5, 2024) Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution (CC-BY) 4.0 License that allows others to share the work with an acknowledgement of the work’s authorship and initial publication in this journal.
How to Cite
