Journal cover Journal topic
Earth System Dynamics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.769 IF 3.769
  • IF 5-year value: 4.522 IF 5-year
    4.522
  • CiteScore value: 4.14 CiteScore
    4.14
  • SNIP value: 1.170 SNIP 1.170
  • SJR value: 2.253 SJR 2.253
  • IPP value: 3.86 IPP 3.86
  • h5-index value: 26 h5-index 26
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 22 Scimago H
    index 22
Discussion papers
https://doi.org/10.5194/esdd-6-2273-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/esdd-6-2273-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 09 Nov 2015

Research article | 09 Nov 2015

Review status
This discussion paper is a preprint. It has been under review for the journal Earth System Dynamics (ESD). A final paper in ESD is not foreseen.

Severe summer heat waves over Georgia: trends, patterns and driving forces

I. Keggenhoff1, M. Elizbarashvili2, and L. King1 I. Keggenhoff et al.
  • 1Justus Liebig University Giessen, Department of Geography, Giessen, Germany
  • 2Ivane Javakhishvili Tbilisi State University, Department of Geography, Tbilisi, Georgia

Abstract. During the last 50 years Georgia experienced a rising number of severe summer heat waves causing increasing heat-health impacts. In this study, the 10 most severe heat waves between 1961 and 2010 and recent changes in heat wave characteristics have been detected from 22 homogenized temperature minimum and maximum series using the Excess Heat Factor (EHF). A composite and Canonical Correlation Analysis (CCA) have been performed to study summer heat wave patterns and their relationships to the selected predictors: mean Sea Level Pressure (SLP), Geopotential Height at 500 mb (Z500), Sea Surface Temperature (SST), Zonal (u-wind500) and Meridional Wind at 500 mb (v-wind500), Vertical Velocity at 500 mb (O500), Outgoing Longwave Radiation (OLR), Relative Humidity (RH500), Precipitation (RR) and Soil Moisture (SM). Most severe heat events during the last 50 years are identified in 2007, 2006 and 1998. Largest significant trend magnitudes for the number, intensity and duration of low and high-impact heat waves have been found during the last 30 years. Significant changes in the heat wave predictors reveal that all relevant surface and atmospheric patterns contributing to heat waves have been intensified between 1961 and 2010. Composite anomalies and CCA patterns provide evidence of a large anticyclonic blocking pattern over the southern Ural Mountains, which attracts warm air masses from the Southwest, enhances subsidence and surface heating, shifts the African Intertropical Convergence Zone (ITCZ) northwards, and causes a northward shift of the subtropical jet. Moreover, pronounced precipitation and soil moisture deficiency throughout Georgia contribute to the heat wave formation and persistence over Georgia. Due to different large- to mesoscale circulation patterns and the local terrain, heat wave effects over Eastern Georgia are dominated by subsidence and surface heating, while convective rainfall and cooling are observed in the West.

I. Keggenhoff et al.
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
I. Keggenhoff et al.
I. Keggenhoff et al.
Viewed  
Total article views: 813 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
370 394 49 813 14 23
  • HTML: 370
  • PDF: 394
  • XML: 49
  • Total: 813
  • BibTeX: 14
  • EndNote: 23
Views and downloads (calculated since 09 Nov 2015)
Cumulative views and downloads (calculated since 09 Nov 2015)
Cited  
Saved  
Discussed  
No discussed metrics found.
Latest update: 23 May 2019
Publications Copernicus
Download
Short summary
Georgia experienced a rising number of severe summer heat waves between 1961 and 2010. Heat wave patterns and their relationships to surface and atmospheric predictors reveal a blocking anticyclone over the southern Ural, which attracts warm air from the South, enhances heating processes over Georgia and shifts large-scale wind streams over Eurasia northwards. Moreover, pronounced precipitation and soil moisture deficiency amplifies heat wave severity and persistence.
Georgia experienced a rising number of severe summer heat waves between 1961 and 2010. Heat wave...
Citation