Spatial Variability of Climatic Drought in the Benghazi Plain Using the (SPI) and Johnson’s Continentality–Oceanity Index (1981–2024)
DOI:
https://doi.org/10.37375/jlgs.v6i1.3756Keywords:
Climatic drought, Standardized Precipitation Index (SPI), Johnson’s continentality–maritime index, spatial analysis, Benghazi PlainAbstract
This study aims to analyze climatic drought in the Benghazi Plain over the period 1981–2024 by integrating two climate indices of different natures: the Standardized Precipitation Index (SPI) and Johnson’s continentality–maritime index. The analysis is based on monthly data obtained from the NASA POWER database. Four observation points were selected and distributed from the coastal zone toward inland areas to represent the climatic gradient between maritime and continental influences. The SPI results reveal a clear gradient in drought severity from the northern coastal areas toward the semi-desert southern parts of the plain, while Johnson’s index indicates a steady increase in continentality along the same direction. Statistical analysis of the relationship between the two indices shows a negative correlation, reflecting the interaction between precipitation-related and thermal factors in shaping drought conditions. Furthermore, spatial analysis using the Kriging interpolation method demonstrates a notable spatial correspondence between increased continentality and higher drought severity in the southern areas, contrasted with relatively moderate conditions along the coast. These findings highlight the importance of integrating precipitation-based and thermal indices with spatial analysis to better interpret the dynamics of climatic drought in the Benghazi Plain.
References
ثامناً: المراجع:
Ali, A. A. M., & Hafi, Z. B. (2022). Standardized precipitation index (SPI) in North Libya and connection with North Atlantic Oscillation (NAO).
Andreu J., David H., Abel S., Javier P., Dionysis A., Wouter W., Henny A.J. van L., Eleni K., Carlo B., Alessandro C., Susana D., Itziar G., Antonio M., Dario M., Francisco R., Irmi S., Lucia S., Julia R., Drought Indicators: Monitoring, Forecasting And Early Warning, Seventh framework programme of the European Community for research and technological development, Technical Report No.33, March 31th 2015.
Baltas, E. (2007). Spatial distribution of climatic indices in northern Greece. Meteorological Applications, 14, 69–78.
Barry, R. G., & Chorley, R. J. (2003). Atmosphere, Weather and Climate (8th ed.). Routledge.
DEWFORA. (2014). Improved Drought Early Warning and Forecasting to Strengthen Preparedness and Adaptation to Droughts in Africa – Final Project Report. Seventh Framework Programme of the European Union (FP7), Contract No. 265454.
El Kenawy, A. M., Al Buloshi, A., Al‑Awadhi, T., Al‑Nasiri, N., Navarro‑Serrano, F., Alhatrushi, S., Robaa, S. M., Domínguez‑Castro, F., McCabe, M. F., Schuwerack, P. M., López‑Moreno, J. I., & Vicente‑Serrano, S. M. (2020). Evidence for intensification of meteorological droughts in Oman over the past four decades. Atmospheric Research, 246.
Libyan National Meteorological Center (LNMC). Benina airport meteorological station data for period (1981–2010), [Unpublished data].
Marzouk, O. A. (2021). Assessment of global warming in Al Buraimi, Sultanate of Oman based on statistical analysis of NASA POWER data over 39 years, and testing the reliability of NASA POWER against meteorological measurements. Heliyon, 7(3).
McKee, T. B., Doesken, N. J., & Kleist, J. (1993). The relationship of drought frequency and duration to time scales. In Proceedings of the Eighth Conference on Applied Climatology (pp. 179–184). American Meteorological Society.
Merabti, A., Darouich, H., Paredes, P., Meddi, M., & Pereira, L. S. (2023). Assessing spatial variability and trends of droughts in Eastern Algeria using SPI, RDI, PDSI, and MedPDSI. Journal of Hydrology: Regional Studies, 42, 101226.
NASA POWER (2025). NASA Prediction of Worldwide Energy Resources (POWER) Data Access Viewer. National Aeronautics and Space Administration.
Soliman, M.M.M. 2020. Trend Analysis of Temperatures and Precipitation in northern part of Libya, (PhD Unpublished), Department of Geography, University of Karabuk, Karabuk, Turkey.
Toros, H., Deniz, A., & İncecik, S. (2008). Continentality and oceanality indices in Turkey. In Proceedings of the Twenty-First Annual Conference of PACON: Energy and Climate Change, Innovative Approaches to Solving Today's Problems (pp. –), Hawaii, USA, June 1–5, 2008.
World Bank. (2021). Libya Climate Risk Country Profile. Climate Knowledge Portal.
World Meteorological Organization & Global Water Partnership. (2016). Handbook of drought indicators and indices (M. Svoboda & B. A. Fuchs, Eds.; WMO‑No. 1173). Integrated Drought Management Programme. Geneva, Switzerland.
Zalika, A. G. (2008). Analysis of meteorological drought in Slovenia with two drought indexes. BALWOIS 2008 Conference, Ohrid, Republic of Macedonia.
