宜蘭雨水之氫氧同位素變化
Other Title
Hydrogen and Oxygen Isotope Variation in I-Lan Precipitation
Journal
臺灣農業化學與食品科學
Journal Volume
40
Journal Issue
5
Pages
336-346
Date Issued
2002-10
Date
2002-10
Author(s)
Abstract
本研究分析宜蘭地區1993年7月至1994年8月14個月間雨水的氫、氧同位素組成，以了解該區之雨水在盛行季風影響下氫、氧向位素組成的變化特徵及意義。結果顯示，宜蘭地區雨水之同位素組成主要是受溫度效應與季風季節效應共同作用影響，季風季節效應的作用方向與溫度效應相反導致冬季東北季風期內的氫、氧同位素組成平均值較夏季西南季風期之值為重，且冬季東北季風時段雨水之氫氧同位素關係式為δD=(8.7 ± 0.9)δ18 O + (23.4 ± 3.2)，而夏季西南季風時段為δD=(8.0 ± 0.3)δ18 O + (9.0 ± 1.9)。根據相關的簡單假設條件，本研究估算各季風時段之溫度效應及季風季節效應影響的程度，結果顯示季節性降雨特性的差異，會造成各時段顯現不同程度的季風季節效應，此結果也說明降雨量是造成同位素組成變化的重要因素。
The hydrogen and oxygen isotopic compositions of precipitation colledted form July 1993 through August 1994 in I-Lan, northeastern Taiwan, Were determined to further our understanding of climatic characteristics and their implications. The results showed that both temperature and seasonal monsoons are main factors but that they had opposite effects in controlling the isotopic composition of local rain water. The isotopic values of winter precipitation during the northeast monsoon period were significantly heavier than those of winter precipitation during the southwest monsoon period in summer. The δD-δ18O relationships of the I-Lan precipitation were found to be δD=(8.7±0.9) δ18O + (23.4 ± 3.2) and δD= (8.0 ± 0.3) δ18O + (9.0 ± 1.9) for the northeast and southwest monsoon periods, respectively. Based on simple assumptions, the temperature and seasonal monsoon effects were estimated for each monsoon period. The results demonstrate that the precipitation amount also plays an important role in the variation of isotope composition.
Subjects
氫氧同位素
雨水
季風期
宜蘭
H-and O-isotopes
Precipitation
Monsoon period
I-Lan
Publisher
台灣農業化學會與台灣食品科學技術學會
Type
journal article
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