Quantification of the impact of moisture source regions on the oxygen isotope composition of precipitation over Eagle Cave, central Spain
Quantification of the impact of moisture source regions on the oxygen isotope composition of precipitation over Eagle Cave, central Spain
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DOI：
10.1016/j.gca.2014.03.011
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发表时间：
2014-06
影响因子：
5
通讯作者：
K. Krklec;D. Domínguez-Villar
中科院分区：
文献类型：
--
作者：
K. Krklec;D. Domínguez-Villar
5天重建的空气质量的历史与降水的日子在鹰洞（西班牙中部），连同水分吸收位置的确定沿着回轨迹，是用来确定该网站的降水水分来源，从2009年至2011年。在这3年期间，约30%的降水在鹰洞起源于伊比利亚半岛（IP）内回收的水分，与近端大西洋也是一个主要的来源地区的水分，而地中海和远大西洋有很大的变化，在研究期间和其他来源地区的降水贡献较小。降水的月氧同位素组成的比较，在鹰洞的月降水来源于源区的百分比显示出显着的负相关的IP区域。因此，在IP区域的水分再循环过程解释了12%的降水的月氧同位素组成的变化（p值< 0.1）。然而，当考虑温度、降水量和所有源区时，降水的月氧同位素组成的74%的变化可以解释（p值< 0.05）。因此，尽管对于鹰洞，降水量和温度是降水氧同位素变化的主要贡献者（r2= 0.54; p值< 0.001），但源区之间的水分吸收分布是一个重要的控制因素，在解释该洞穴的氧同位素洞穴沉积物记录时应予以考虑。这项研究强调了水分来源在控制中纬度地区降水的氧同位素组成的重要性，以及为了提高依赖于降水的同位素组成的氧同位素古记录的解释，需要对这种影响进行量化。
The 5-day reconstruction of air mass history for the days with precipitation at Eagle Cave (central Spain), together with the determination of moisture uptake locations along back trajectories, is used to identify the moisture sources of precipitation for this site from 2009 to 2011. During this 3-year period, around 30% of precipitation at Eagle Cave originated from the moisture recycled within the Iberian Peninsula (IP), with the Proximal Atlantic being also a main source region of moisture, whereas the Mediterranean Sea and the Distal Atlantic have large variability during the studied period and other source regions are minor precipitation contributors. The comparison of monthly oxygen isotope composition of precipitation at Eagle Cave with the monthly percentage of precipitation originated in source regions shows a significant negative correlation for the IP region. Thus, the moisture recycling process in the IP region explains 12% of the variability of the monthly oxygen isotope composition of precipitation (p-value < 0.1). However, when temperature, amount of precipitation and all source regions are considered, 74% of the variability of the monthly oxygen isotope composition of precipitation is explained (p-value < 0.05). Therefore, although for Eagle Cave amount of precipitation and temperature are main contributors of the precipitation oxygen isotope variability (r2= 0.54;p-value < 0.001), the moisture uptake distribution among source regions is a substantial control and should be considered when interpreting oxygen isotope speleothem records from this cave. This research highlights the importance of moisture sources in controlling the oxygen isotope composition of precipitation in mid-latitudes, and the need of quantification of this effect in order to improve the interpretation of oxygen isotope paleo-records that depend on isotope composition of precipitation.