Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan
Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan
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日本东北部介形动物群记录的全新世浅海环境百年至千年规模的变化
DOI：
10.1016/j.yqres.2015.10.006
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发表时间：
2015
影响因子：
2.3
通讯作者：
Katsunori Kimoto
中科院分区：
文献类型：
--
作者：
Toshiaki Irizuki;Miki Kobe;Ken’ichi Ohkushi;Hodaka Kawahata;Katsunori Kimoto
利用日本东北部木曲湾865 cm长柱状岩心的浅海介形动物群记录和沉积物粒度资料，以高分辨率确定了该海湾全新世早期至中期的古海洋学变化。一些物种的相对频率变化表现出类似于Bond周期的1300-1800年的周期性。在大约10,300 cal yr BP和9500-9300 cal yr BP，由于冷却事件，冷水强烈地影响了海湾。自至少10,200 cal yr BP以来，津加鲁暖流影响了地表水，自约7400 cal yr BP以来，也影响了海湾的底部水域。自约8400 cal yr BP以来，由于全球海平面上升，水深迅速增加，并在7000-5900 cal yr BP达到峰值。随后，在5900年和4000 cal yr BP左右，海湾水温和海平面的下降影响了介形虫组合的组成。这些全新世期间相对海平面和海湾温度的千年尺度振荡可以与其他地方的古气候记录相关联。
Using the record of shallow-marine ostracode fauna and sediment grain size data from an 865-cm-long piston core obtained from Mutsu Bay, northeast Japan, paleoceanographic changes of the bay were determined at high resolution for the early to middle Holocene. Changes in the relative frequencies of several species showed periodicities of 1300–1800 years similar to Bond cycles. At around 10,300 cal yr BP and again, at 9500–9300 cal yr BP, cold water strongly influenced the bay owing to cooling events. Since at least 10,200 cal yr BP the Tsugaru Warm Current influenced the surface waters, and since ca. 7400 cal yr BP, also the bottom waters of the bay. Since ca. 8400 cal yr BP the water depth rapidly increased and peaked at 7000–5900 cal yr BP due to global sea-level rise. Subsequently, a drop of water temperature and sea level in the bay at 5900 and around 4000 cal yr BP influenced the composition of the ostracode assemblages. These millennial-scale oscillations in relative sea level and bay temperature during the Holocene can be correlated to paleoclimate records elsewhere.