Sea surface temperature and salinity changes near the Soya Strait during the last 19 ka
Sea surface temperature and salinity changes near the Soya Strait during the last 19 ka
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DOI：
10.1016/j.quaint.2014.06.014
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发表时间：
2014-09
影响因子：
2.2
通讯作者：
S. W. Bae;K. Lee;Y. Park;K. Kimoto;K. Ikehara;N. Harada
中科院分区：
文献类型：
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作者：
S. W. Bae;K. Lee;Y. Park;K. Kimoto;K. Ikehara;N. Harada
应用烯酮不饱和指数和有孔虫Neogloboquadrina pachyderma（s）氧同位素比值重建了19 calka BP以来东海东北部/日本海表层温度（SST）和盐度（SSS）的历史变化。岩芯顶部的烯酮温度和钙化温度分别对应于10-30 m深处夏季和春季的海水温度。根据该岩心的记录和以往的研究，已重建的时空变化的烯酮温度的东海/日本海的表面环流和副极地锋（SPF）的位置的变化进行了调查。从冰期到全新世的过渡期，整个东海/日本海的SST比现今低2-3 °C，SSS显著增加，但仍低于现今。但北方SSS高于南方。冷咸海水的来源可能是亲潮海流（OY，从北方流入），而不是对马暖流（TWC，从南方流入）。当时的海平面上升很快。在过渡期内，由于污水处理厂的流入受到限制，污水处理厂可能不会有强劲的发展。在全新世早期，东海/日本海的SST和SSS增加相比，过渡期由于增加的海水交换通过海峡。由于海平面较低，TWC的流入未充分发展，因此SPF从西南向东北倾斜。随后，东海/日本海的表面条件与今天的6 cal ka BP相似。早春经索亚海峡流出的索亚暖水先导（FSWW）并没有影响冰期和间冰期鄂霍次克海中层水和北太平洋中层水的形成。
Past sea surface temperature (SST) and salinity (SSS) changes in the northeastern East Sea/Japan Sea since 19 cal ka BP have been reconstructed by using an alkenone unsaturation index and the oxygen isotope ratio of planktonic foraminiferaNeogloboquadrina pachyderma(s) in Core MR0604-PC03B. Coretop alkenone temperature and calcification temperature correspond to the temperature of seawater in summer and spring at the depth of 10–30 m, respectively. Based on the records from this core and previous studies, spatio-temporal changes in alkenone temperature of the East Sea/Japan Sea have been reconstructed to investigate changes of surface circulations and the subpolar front (SPF) position. During the transitional period from the glacial to the Holocene, the SST was lower (about 2–3 °C) than that of today and the SSS dramatically increased at that time in the entire East Sea/Japan Sea but it was still lower than that of today. However, the northern SSS was higher than that of the southern part. The source of the cold and saline seawater could have been the Oyashio Current (OY, inflow from the north), not the Tsushima Warm Current (TWC, inflow from the south). Probably, sea level rose rapidly at that time. There might be no strong development of the SPF during the transitional period due to the restricted inflow of the TWC. During the early Holocene, the SST and SSS of the East Sea/Japan Sea increased compared to the transitional period due to increased seawater exchange through straits. The SPF was tilted orienting from southwest to northeast because the inflow of the TWC was not fully developed due to lower sea level. Subsequently, the surface condition of the East Sea/Japan Sea was similar to that of today at 6 cal ka BP. The Forerunner of Soya Warm Water (FSWW) that flowed out through the Soya Strait in early spring did not affect the formation of the Okhotsk Sea Intermediate Water and the North Pacific Intermediate Water during the glacial and interglacial periods.