Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region

Details Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.289..357p&link_type=abstract

Earth and Planetary Science Letters, Volume 289, Issue 3-4, p. 357-366.

Computer Science

6

Scientific paper

The stable oxygen and hydrogen isotopic features of precipitation in Taiwan, an island located at the western Pacific monsoon area, are presented from nearly 3,500 samples collected during the past decade for 20 stations. Results demonstrate that moisture sources from diverse air masses with different isotopic signals are the main parameter in controlling the precipitation's isotope characteristics. The air mass from polar continental (Pc) region contributes the precipitation with high deuterium excess values (up to 23‰) and relatively enriched isotope compositions (e.g., - 3.2‰ for δ18O) during the winter with prevailing northeasterly monsoon. By contrast, air masses from equatorial maritime (Em) and tropical maritime (Tm) supply the precipitation with low deuterium excess values (as low as about 7‰) and more depleted isotope values (e.g., - 8.9‰ and - 6.0‰ for δ18O of Tm and Em, respectively) during the summer with prevailing southwesterly monsoon. Thus seasonal differences in terms of δ18O, δD, and deuterium excess values are primarily influenced by the interactions among various precipitation sources. While these various air masses travel through Taiwan, secondary evaporation effects further modify the isotope characteristics of the inland precipitation, such as raindrop evaporation (reduces the deuterium excess of winter precipitation) and moisture recycling (increases the deuterium excess of summer precipitation). The semi-quantitative estimations in terms of evaluation for changes in the deuterium excess suggest that the raindrop evaporation fractions for winter precipitation range 7% to 15% and the proportions of recycling moisture in summer precipitation are less than 5%. Additionally, the isotopic altitude gradient in terms of δ18O for summer precipitation is - 0.22‰/100 m, greater than - 0.17‰/100 m of winter precipitation. The greater isotopic gradient in summer can be attributed to a higher temperature vs. altitude gradient relative to winter. The observed spatial and seasonal stable isotopic characteristics in Taiwan's precipitation not only contribute valuable information for regional monsoon research crossing the continent-ocean interface of East Asia, but also can serve as very useful database for local water resources management.

Affiliated with

Also associated with

No associations

Rating

Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stable isotopic characteristic of Taiwan's precipitation: A case study of western Pacific monsoon region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1443338