Ilmo Hela

1915

• A study of the annual fluctuation of the heights of sea-level in the Baltic and in the North Sea
• Drift currents and permanent flow
• Fisheries hydrography
• On the energy exchange between the sea and the atmosphere in the Baltic area
• On the periodicity of the recent changes in our climate
• Secular changes in the salinity of the upper waters of the northern Baltic Sea
• The surface current field in the western part of the north Atlantic
• Über die Schwankungen des Wasserstandes in der Ostsee
• Utilization of physical oceanography in the service of marine fisheries, presented 14. 5. 1965