Journal
CLIMATIC CHANGE
Volume 115, Issue 3-4, Pages 505-517Publisher
SPRINGER
DOI: 10.1007/s10584-012-0439-z
Keywords
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Funding
- National Science Foundation [AGS-0902507]
- Directorate For Geosciences [908971] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1049238] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23686071] Funding Source: KAKEN
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The seasonally varying moisture balance in a montane forest of Southeast Asia is reconstructed for the 20th century from the oxygen isotopic composition (delta O-18) of subannual tree cellulose samples of Pinus kesiya growing at 1,500 m elevation on Doi Chiang Dao in northern Thailand. The cellulose delta O-18 values exhibit a distinctive annual cycle with amplitude of up to 12 parts per thousand, which we interpret to represent primarily the seasonal cycle of precipitation delta O-18. The annual mean delta O-18 values correlate significantly with the amount of summer monsoon precipitation, and suggest a temporal weakening relationship between the South Asian monsoon and El Nio-Southern Oscillation over the late 20th century. The cellulose delta O-18 annual maxima values, which reflect the dry season moisture status, have declined progressively over the 20th century by about 3.5 parts per thousand. We interpret this to indicate a change in the contribution of the isotopically distinct fog water to the dry season soil moisture in response to rising temperature as well as deforestation.
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