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Winter Wind Regimes over Israel Using Self-Organizing Maps

Winter Wind Regimes over Israel Using Self-Organizing Maps AbstractThe aim of this study is to objectively define and automatically reconstruct surface wind regimes over Israel. Unlike other previous studies that subjectively examined case studies or applied the semiobjective synoptic classification (SOC), this study shows the ability of the method of self-organizing maps (SOM) to directly define well-known wind regimes at the synoptic hours (0000, 0600, 1200, and 1800 UTC) during the winter. This ability sets the groundwork for future automatic climatological analysis and applications. The investigation is performed by analyzing surface wind measurements from 53 Israel Meteorological Service stations. The relation between the synoptic variables and the wind regimes is revealed from the averages of ECMWF interim reanalysis (ERA-Interim) variables at each SOM wind regime. The inspection of wind regimes and their average pressure anomalies has shown that wind regimes relate to the gradient of the pressure anomalies rather than to the specific isobaric pattern. Two main wind regimes—strong western and strong eastern—are well known over this region. During daytime, SOM classification identifies these two regimes while SOC reveals only strong western regimes since SOC considers depth of the pressure gradients only in the case of low pressure centers. In accordance with previous studies, two main groups—winter low and high pressure centers and/or Red Sea troughs—are related to the strong westerly or easterly wind regimes with low diurnal variability and high daily persistence. Regimes under weak pressure gradients have higher diurnal variability, relatively lower steadiness, and weaker speed. Their daily persistence is not necessarily low. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Meteorology and Climatology American Meteorological Society

Winter Wind Regimes over Israel Using Self-Organizing Maps

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1558-8432
DOI
10.1175/JAMC-D-16-0381.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe aim of this study is to objectively define and automatically reconstruct surface wind regimes over Israel. Unlike other previous studies that subjectively examined case studies or applied the semiobjective synoptic classification (SOC), this study shows the ability of the method of self-organizing maps (SOM) to directly define well-known wind regimes at the synoptic hours (0000, 0600, 1200, and 1800 UTC) during the winter. This ability sets the groundwork for future automatic climatological analysis and applications. The investigation is performed by analyzing surface wind measurements from 53 Israel Meteorological Service stations. The relation between the synoptic variables and the wind regimes is revealed from the averages of ECMWF interim reanalysis (ERA-Interim) variables at each SOM wind regime. The inspection of wind regimes and their average pressure anomalies has shown that wind regimes relate to the gradient of the pressure anomalies rather than to the specific isobaric pattern. Two main wind regimes—strong western and strong eastern—are well known over this region. During daytime, SOM classification identifies these two regimes while SOC reveals only strong western regimes since SOC considers depth of the pressure gradients only in the case of low pressure centers. In accordance with previous studies, two main groups—winter low and high pressure centers and/or Red Sea troughs—are related to the strong westerly or easterly wind regimes with low diurnal variability and high daily persistence. Regimes under weak pressure gradients have higher diurnal variability, relatively lower steadiness, and weaker speed. Their daily persistence is not necessarily low.

Journal

Journal of Applied Meteorology and Climatology – American Meteorological Society

Published: Oct 6, 2017

References

  • Semi-objective classification for daily synoptic systems: Application to the eastern Mediterranean climate change
    Alpert, P.; Osetinsky, I.; Ziv, B.; Shafir, H.
  • Cluster analysis of hourly wind measurements to reveal synoptic regimes affecting air quality
    Beaver, S.; Palazoglu, A.
  • Synoptic classes as a predictor of hourly surface wind regimes: The case of the central and southern Israeli coastal plains
    Berkovic, S.
  • The influence of the special shape of the Dead-Sea and its environment on the local wind system
    Bitan, A.
  • Cluster analysis of the wind events and seasonal wind circulation patterns in the Mexico City region
    Carreón-Sierra, S.; Salcido, A.; Castro, T.; Celada-Murillo, A.-T.
  • Observational study of wind channeling within the St. Lawrence River valley
    Carrera, M. L.; Gyakum, J. R.; Lin, C. A.
  • Relationship between synoptic-scale atmospheric circulation and ozone concentrations over Israel
    Dayan, U.; Levy, I.
  • On the importance of synoptic classification methods with respect to environmental phenomena
    Dayan, U.; Tubi, A.; Levy, I.
  • Weather regimes over Senegal during the summer monsoon season using self-organizing maps and hierarchical ascendant classification. Part I: Synoptic time scale
    Guèye, A. K.; Janicot, S.; Niang, A.; Sawadogo, S.; Sultan, B.; Diongue-Niang, A.; Thiria, S.
  • Analysis and downscaling multi-model seasonal forecasts in Peru using self-organizing maps
    Gutierrez, J. M.; Cano, R.; Cofino, A. S.; Sordo, C.
  • Self-organizing maps: Applications to synoptic climatology
    Hewitson, B. C.; Crane, R. G.
  • A hybrid model of self-organizing maps (SOM) and least square support vector machine (LSSVM) for time-series forecasting
    Ismail, S.; Shabri, A.; Samsudin, R.
  • A validation of the Antarctic Mesoscale Prediction System using self-organizing maps and high-density observations from SNOWWEB
    Jolly, B.
  • A five-year study of coastal recirculation and its effect on air pollutants over the east Mediterranean region
    Levy, I.; Dayan, U.; Mahrer, Y.
  • Differing atmospheric scales of motion and their impact on air pollutants
    Levy, I.; Dayan, U.; Mahrer, Y.
  • Performance evaluation of the self-organizing map for feature extraction
    Liu, Y.; Weisberg, R. H.; Mooers, C. N. K.
  • Surface current patterns in the northern Adriatic extracted from high‐frequency radar data using self‐organizing map analysis
    Mihanović, H.; Cosoli, S.; Vilibić, I.; Ivanković, D.; Dadić, V.; Gačić, M.
  • Identification of surface wind patterns over the Ross Ice Shelf, Antarctica, using self-organizing maps
    Nigro, M. A.; Cassano, J. J.
  • Relative performance of self-organizing maps and principal component analysis in pattern extraction from synthetic climatological data
    Reusch, D.; Alley, R. B.; Hewitson, B. C.
  • Using self-organizing maps to identify patterns in satellite imagery
    Richardson, A. J.; Risien, C.; Shillington, F. A.
  • Continental polar outbreaks into the Levant and eastern Mediterranean
    Saaroni, H.; Bitan, A.; Alpert, P.; Ziv, B.
  • Easterly wind storms over Israel
    Saaroni, H.; Ziv, B.; Bitan, A.; Alpert, P.
  • Self organization with partial data
    Samad, T.; Harp, S. A.
  • Interpreting self-organizing maps through space–time data models
    Sang, H.; Gelfand, A. E.; Lennard, C.; Hegerl, G.; Hewitson, B.
  • A description of the Ross Ice Shelf air stream (RAS) through the use of self‐organizing maps (SOM)
    Seefeldt, M. W.; Cassano, J. J.
  • The self-organizing map in synoptic climatological research
    Sheridan, S. C.; Lee, C. C.
  • An advanced statistical method for wind power forecasting
    Sideratos, G.; Hatziargyriou, N. D.
  • Subjective analysis of mesoscale flow patterns in northern Israel
    Skibin, D.; Hod, A.
  • The factors governing the summer regime of the eastern Mediterranean
    Ziv, B.; Saaroni, H.; Alpert, P.