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Stalagmite evidence for East Asian winter monsoon variability and 18 O-depleted surface water in the Japan Sea during the last glacial period
Progress in Earth and Planetary Science ( IF 2.508 ) Pub Date : 2021-02-22 , DOI: 10.1186/s40645-021-00409-8
Shota Amekawa, Kenji Kashiwagi, Masako Hori, Tomomi Sone, Hirokazu Kato, Tomoyo Okumura, Tsai-Luen Yu, Chuan-Chou Shen, Akihiro Kano

In the East Asian monsoon area, stalagmites generally record lower and higher oxygen isotope (δ18O) levels during warm humid interglacial and cold dry glacial periods, respectively. Here, we report unusually low stalagmite δ18O from the last glacial period (ca. 32.2–22.3 ka) in Fukugaguchi Cave, Niigata Prefecture, Japan, where a major moisture source is the East Asian winter monsoon (EAWM) that carries vapor from the warm surface of the Japan Sea. The δ18O profile of this stalagmite may imply millennial-scale changes, and high δ18O intervals that are related to Dansgaard–Oeschger (D–O) interstadials. More importantly, the stalagmite exhibits low overall δ18O values; the mean δ18O (− 8.87‰) is distinctly lower than the mid-Holocene mean of another stalagmite from the same cave (4.2–8.2 ka, − 7.64‰). An interpretation assuming a more intense EAWM and greater vapor transportation during the last glacial period, compared with the mid-Holocene, contradicts the limited inflow of the Tsushima Warm Current into the Japan Sea because of lowered sea level. Additionally, our model calculation using δ18O data from meteoric water indicated that the amount effect of winter meteoric water was insignificant (1.2‰/1000 mm). Low stalagmite δ18O for the last glacial period in Fukugaguchi Cave most likely resulted from 18O-depleted surface water, which developed in the isolated Japan Sea. The estimated amplitude of the δ18O decrease in surface water was ~ 3‰ at most, consistent with the abnormally low values for foraminifera (by ~ 2.5‰) in sediment during the last glacial period, shown by samples collected from the Japan Sea. This is the first terrestrial evidence of 18O depletion in Japan Sea surface water during the last glacial period.



中文翻译:

上一个冰川期东日本冬季风的石笋证据和日本海中18 O耗尽的地表水

在东亚季风区,石笋通常(δ记录较低和较高的氧同位素18 O)温暖期间水平湿润的间和冷干冰周期,分别。在这里,我们报告异常低石笋δ 18从Fukugaguchi洞,日本新泻县,其中一个主要的水分来源是东亚冬季风(东亚冬季风),从带有蒸汽末次冰期(约32.2-22.3 KA)O日本海的温暖表面。的δ 18这石笋O配置文件可能意味着千年尺度的变化,和高δ 18个ö使用有关丹斯加德-Oeschger(d-O)interstadials间隔。更重要的是,石笋表现出低的总δ 18个O值; 平均δ 18O(− 8.87‰)明显低于同一洞穴中另一颗石笋的全新世中期平均值(4.2–8.2 ka,− 7.64‰)。与全新世中期相比,一种假设假设在最后一个冰期,EAWM更加强烈,蒸气输送更多,这与对马岛对流由于日本海平面降低而流入日本海的情况有限。此外,我们使用δ模型计算18个从大气水O数据表明,冬季大气水的量的效果显着(1.2‰/ 1000毫米)。低石笋δ 18 O代表在Fukugaguchi洞穴末次冰期最有可能是由于18 O型耗尽地表水,这在隔离日本海发展。的δ的估计的幅度18从日本海收集的样本显示,地表水的O减少最多约为3‰,与上一个冰川期沉积物中有孔虫的异常低值(约2.5‰)相符。这是最后一个冰期日本海表层水消耗18 O的第一个地面证据。

更新日期:2021-02-22
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