Iliopoulou et al. (2026) Complexity of Hydroclimatic Changes in the Mediterranean: Exploring Climate Drivers Using ERA5 Reanalysis

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Water
• Year: 2026
• Authors: Theano Iliopoulou, Marianna Lada, Christina-Ioanna Stavropoulou, Dimitra-Myrto Tourlaki, Nikos Tepetidis, Panayiotis Dimitriadis, Demetris Koutsoyiannis
• DOI: 10.3390/w18030331

Research Groups

• Not specified in the provided text.

Short Summary

This study analyzes ERA5 reanalysis data (1950–2024) to evaluate Mediterranean hydroclimatic trends, finding significant lower-tropospheric warming and steepening lapse rates while precipitation and evaporation remain primarily governed by wind speed rather than temperature.

Objective

• To investigate long-term trends and physical interrelations among temperature, precipitation, evaporation, wind, sensible heat, and column water in the Mediterranean, distinguishing between land and sea domains and atmospheric layers.

Study Configuration

• Spatial Scale: Mediterranean region, categorized into land and sea domains across multiple atmospheric layers.
• Temporal Scale: 1950–2024 (74-year period).

Methodology and Data

• Models used: Hurst–Kolmogorov (HK) stochastic framework for analyzing persistent long-term variability.
• Data sources: ERA5 reanalysis data.

Main Results

• Temperature Trends: Significant warming in the lower troposphere at rates of 0.03 °C year⁻¹ over land and 0.015 °C year⁻¹ over sea; upper troposphere temperatures remain nearly stagnant, indicating a steepening lapse rate.
• Evaporation and Wind: Evaporation shows no strong long-term increase (slight rise over sea, modest decline over land) and is strongly correlated with declining wind speeds rather than rising temperatures.
• Energy Partitioning: Sensible heat flux increases over land but decreases over sea, revealing divergent energy-partition regimes.
• Precipitation: No significant long-term change in precipitation was observed, suggesting a decrease in the atmosphere's efficiency in converting vapor into rainfall despite higher moisture content.
• Dominant Drivers: Wind speed exerts a more significant control on evaporation and precipitation across the region than temperature.

Contributions

• Provides a comprehensive multi-variable analysis of Mediterranean hydroclimatology that challenges the assumption of temperature-driven evaporation increases.
• Identifies a steepening lapse rate and divergent land-sea energy regimes.
• Demonstrates the importance of dynamic factors (wind) and persistent long-term variability (Hurst–Kolmogorov behavior) over simple linear temperature trends.

Funding

• Not specified in the provided text.

Citation

@article{Iliopoulou2026Complexity,
  author = {Iliopoulou, Theano and Lada, Marianna and Stavropoulou, Christina-Ioanna and Tourlaki, Dimitra-Myrto and Tepetidis, Nikos and Dimitriadis, Panayiotis and Koutsoyiannis, Demetris},
  title = {Complexity of Hydroclimatic Changes in the Mediterranean: Exploring Climate Drivers Using ERA5 Reanalysis},
  journal = {Water},
  year = {2026},
  doi = {10.3390/w18030331},
  url = {https://doi.org/10.3390/w18030331}
}

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