Global climatic interpretation of the deuterium‐oxygen 18 relationship for precipitation

American Geophysical Union (AGU) - Tập 84 Số C8 - Trang 5029-5033 - 1979
Liliane Merlivat, Jean Jouzel

Tóm tắt

A theoretical model is derived to account for the deuterium‐oxygen 18 relationship measured in meteoric waters. A steady state regime is assumed for the evaporation of water at the ocean surface and the subsequent formation of precipitation. The calculations show that the deuterium and oxygen 18 content in precipitation can be taken as linearly related. From the slope and the intercept (known as the deuterium excess) of the δD‐δ18O linear relationship for precipitation we compute the mean values on a global scale of the evaporating ocean surface temperature and the relative humidity of the air masses overlying the oceans. The deuterium excess is primarly dependent on the mean relative humidity of the air masses formed above the ocean surface. Paleoclimatic data may be obtained by this isotopic method from the analysis of old water and ice samples. A moisture deficit of the air over the ocean, equal to only 10%, in comparison to 20% for modern conditions, is deduced from the deuterium‐oxygen 18 distribution measured in groundwater samples older than 20,000 years.

Từ khóa


Tài liệu tham khảo

10.1029/WR011i004p00543

10.1175/1520-0469(1975)032<2029:TRLFWV>2.0.CO;2

10.1126/science.133.3465.1702

10.1111/j.2153-3490.1964.tb00181.x

Eriksson E. B.Bolin Oxygen 18 deuterium and tritium in natural waters and their relations to the global circulation of water Proceedings of the Second Conference on Radioactive Fallout From Nuclear Weapon Tests 675–686Atomic Energy Commission Germantown Md. 1964.

10.1029/JC080i036p05015

Majoube M., 1971, Fractionnement en oxygène 18 et en deutérium entre l'eau et sa vapeur, J. Chim. Phys., 10, 1473

10.1029/JC083iC06p02977

10.1063/1.436884

10.1029/JC080i024p03455

Sonntag C., 1979, Isotope Hydrology 1978, 569

Sverdrup H. V., 1946, The Oceans, 127

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Thông tin xuất bản

American Geophysical Union (AGU)

Tập 84 Số C8

5029-5033

Thông tin tác giả