Variations in sea surface hydrology in the southern Makassar Strait over the past 26 kyr
Variations in sea surface hydrology in the southern Makassar Strait over the past 26 kyr
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DOI：
10.1016/j.quascirev.2016.10.018
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发表时间：
2016-12
影响因子：
4
通讯作者：
Jan F. Schröder;A. Holbourn;W. Kuhnt;K. Küssner
中科院分区：
文献类型：
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作者：
Jan F. Schröder;A. Holbourn;W. Kuhnt;K. Küssner
我们展示了望加锡海峡南部苏拉威西岛近海曼达尔湾沉积物核心中的海面温度和氧同位素的百年尺度记录，这些记录为过去 26 年来印度尼西亚气候的变化提供了新的见解。岩心的年龄模型受到 17 个 AMS 放射性碳年龄的限制，并根据配对的木材和有孔虫样本进行了表面海洋储层年龄校正。全新世小型水库年龄为 105 ± 180 年，表明强烈的表面海洋-大气交换与季风降水增加有关，而末次盛冰期和冰消期水库年龄则明显更高。基于Globigerinoides ruber(s.s.，白色)的Mg/Ca推导的海面温度重建在南极冷逆转期间表现出延长的高原，表明大气与南半球高纬度气候的联系以及G的季节性偏差。 鲁伯。这与南半球沿印度尼西亚贯穿流轨迹的地点一致，并且与南中国海、苏禄海和西太平洋（棉兰老岛附近）的北半球记录形成鲜明对比，这些记录在伯林-阿勒罗德期间表现出变暖。冰量校正的 δ18O 海水 (δ18Osw) 在 Heinrich Stadial 1 和新仙女木期期间增加，而 Bølling-Allerød 的特点是 δ18Osw 较低。我们将末次盛冰期和盛冰期期间望加锡海峡南部的 δ18Osw 变化归因于降水来源和季节性的变化，而不是当地降水量和径流量的变化。
We present centennial-scale records of sea surface temperature and oxygen isotopes in a sediment core from Mandar Bay, offshore Sulawesi in the southern Makassar Strait, which provide new insights into the variability of Indonesian climate over the past 26 kyr. The age model for the core is constrained by 17 AMS radiocarbon ages, with a surface ocean reservoir age correction based on paired wood and foraminiferal samples. Small Holocene reservoir ages of 105 ± 180 years point to intense surface ocean-atmosphere interchange linked to increased monsoonal precipitation, whereas Last Glacial Maximum and deglacial reservoir ages are significantly higher. Mg/Ca derived sea surface temperature reconstructions based onGlobigerinoides ruber(s. s., white) exhibit an extended plateau during the Antarctic Cold Reversal, suggesting an atmospheric connection to high-latitude Southern Hemisphere climate and a seasonal bias onG. ruber. This is in agreement with southern hemisphere sites along the track of the Indonesian Throughflow and in contrast to Northern Hemisphere records from the South China Sea, Sulu Sea and Western Pacific (off Mindanao), which exhibit warming during the Bølling-Allerød. Ice-volume corrected δ18O seawater (δ18Osw) increased during Heinrich Stadial 1 and the Younger Dryas, whereas the Bølling-Allerød is characterized by low δ18Osw. We attribute δ18Oswvariability in the southern Makassar Strait during the Last Glacial Maximum and glacial termination to changes in provenance and seasonality of precipitation rather than to variability in the amount of local precipitation and runoff.