Mid-Holocene sea surface conditions and riverine influence on the inshore Great Barrier Reef
Mid-Holocene sea surface conditions and riverine influence on the inshore Great Barrier Reef
复制标题
DOI：
10.1177/0959683614534739
复制
发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
R. Roche;C. Perry;S. Smithers;M. Leng;C. Grove;H. Sloane;Catherine Unsworth
中科院分区：
文献类型：
--
作者：
R. Roche;C. Perry;S. Smithers;M. Leng;C. Grove;H. Sloane;Catherine Unsworth
我们测量了一个中全新世斑岩的锶/钙、δ~(18)O和光谱发光比(G/B)。从近岸大堡礁(GBR)发现的微型环礁。这些记录分别被用作重建海表面温度、周围海水的δ18O(δ18Osw)和河流影响的替代物，并与现代Porites sp.的记录进行了比较。在相同的环境中生长的微型环礁。在中全新世记录中，强烈的河流影响表现为：(1)中全新世记录的δ-18Osw年极差增大，(2)洪水事件的δ-18O特征出现负峰，(3)高G/B发光比。G/B的季节性周期表明，在全新世中期，腐植酸的输入在一年中的较长时间内都有所增加。与现代相比，δ18Osw的季节周期早在全新世中期达到峰值，而δ18Osw的平均值与现代值相似。这些记录提供了近岸GBR在中全新世气候变化期间经历的海洋条件的洞察，并与约4700卡的澳大利亚-印度尼西亚夏季风(AISM)系统相一致。YR BP。
We present measurements of Sr/Ca, δ18O, and spectral luminescence ratios (G/B) from a mid-Holocene Porites sp. microatoll recovered from the nearshore Great Barrier Reef (GBR). These records were used as proxies to reconstruct sea surface temperature (SST), the δ18O of surrounding seawater (δ18Osw), and riverine influence, respectively, and compared with records from a modern Porites sp. microatoll growing in the same environment. Strong riverine influence in the mid-Holocene record is indicated by (1) an increased annual δ18Osw range in the mid-Holocene record, (2) negative peaks in δ18O characteristic of flood events, and (3) a higher G/B luminescence ratio. Seasonal cycles in G/B suggest that humic acid inputs were elevated for a longer portion of the year during the mid-Holocene. The seasonal cycle of δ18Osw peaked earlier in the year in the mid-Holocene record relative to the modern, while mean δ18Osw values from the mid-Holocene record were similar to modern values. These records provide an insight into the oceanographic conditions the nearshore GBR experienced during mid-Holocene climatic shifts and are consistent with a strong Australian–Indonesian Summer Monsoon (AISM) system at ~ 4700 cal. yr BP.