Characteristics of seasonal precipitation isotope variability in Indonesia
Characteristics of seasonal precipitation isotope variability in Indonesia
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DOI：
10.3178/hrl.11.92
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发表时间：
2017-01-01
影响因子：
1.1
通讯作者：
Kusumaningtyas, Sheila D. A.
中科院分区：
文献类型：
--
作者：
Belgaman, Halda A.;Ichiyanagi, Kimpei;Kusumaningtyas, Sheila D. A.
印度尼西亚以前对降水同位素(德尔塔O-18和德尔塔D)进行的少数研究，基于低空间分辨率观测数据，发现它们的季节变化具有几种类型的模式。本研究进行了高空间分辨率的降雨采样，并研究了印度尼西亚降水同位素的时间特征。每周从印度尼西亚的33个测站采集降雨样本。聚类分析表明，根据O-18三角洲降水的季节变化，印度尼西亚可以分为四种类型。大部分站点的O-18变率呈现季节性变化，主要表现为旱季(7-10月)的高值型，类型2也有一个高峰值，但在较长的时段(6-11月)与类型1的站点相似。印度尼西亚西北部的一个地区，包括苏门答腊岛北部和中部以及婆罗洲西部，被确定为3型，在1-2月和5-8月有两个高增量O-18值的峰值。另一种变率模式是反季风型，表现为印度尼西亚东部5-7月的低增量O-18。亚澳季风是控制三角洲O-18季节变化的主要因素。这项研究表明，降水中的稳定同位素可以与印度尼西亚的降水气候相对应。
The few previous studies of precipitation isotopes (delta O-18 and delta D) in Indonesia, based on low spatial resolution observation datasets, have found several types of patterns in their seasonal variabilities. This study conducted high spatial resolution rainfall sampling and investigated the temporal characteristics of precipitation isotope in Indonesia. Rainfall samples were collected weekly from 33 stations in Indonesia. Cluster analysis showed that Indonesia could be divided into four types based on the seasonal variability of the precipitation of delta O-18. The majority of stations showed seasonal patterns in the variability of delta O-18, characterized by high values in the dry season (July-October) as type 1. Type 2 also showed one peak of high delta O-18 but in the longer period (June-November) was similar to type 1 stations. A region of Northwest Indonesia, comprising North and Central Sumatra and western Borneo, was identified as type 3, having two peaks of high delta O-18 values in January-February and May-August. Another pattern of variability was the anti-monsoonal type, indicated by low delta O-18 in May-July found in east part of Indonesia. Asia-Australia monsoon regime was the main factor that controls seasonal delta O-18 variability. This research showed that stable isotope in precipitation could correspond to precipitation climatology in Indonesia.