GLOBAL MAPPING OF STABLE ISOTOPES AND TRACE ELEMENTS IN THE PLANKTONIC FORAMINIFERA AND ITS APPLICATION TO PALEOCEANOGRAPHY

浮游有孔虫稳定同位素和微量元素的全球测绘及其在古海洋学中的应用

• 批准号: 16340161
• 负责人: KAWAHATA Hodaka
• 金额: $ 9.54万
• 依托单位: The University of Tokyo (2005)National Institute of Advanced Industrial Science and Technology (2004)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340161/
• 关键词: GLOBAL ENVIRONMENTS; PALEO-ENVIRONMENTS; PLANKTONIC FORAMINIFERA; STABLE ISOTOPES; SURFACE WATER; PROXY; DEEP WATER; PACIFIC OCEAN; G.ruber; 低緯度海域

Stable carbon and oxygen isotopes of foraminiferal and coral skeletons and molluscs have provided detailed information about the linkage between biological calcification processes and surrounding environments. Globigerinoides ruber has recently received much attention for paleoceanography in the subtropical and tropical ocean. G. ruber has two morphotypes (G. ruber s.s. and G. ruber s.l.) : G. ruber s.s. and s.l. are dwelling at the surface layer and at the deeper depth in the surface water, respectively. In order to establish a proxy for the quantitative reconstruction of sea surface temperature, oxygen and carbon isotopes were analyzed in G. ruber collected at 30 degree north, 175 degree east in the Pacific. The mean difference of delta 18 oxygen values between both morphotypes was 0.25‰ in August-October, corresponding to 1 degree C difference in water temperature. Together with foraminiferal assemblage, delta 18 oxygen values of two morphotypes of G. ruberー can be a good proxy for … More quantitative reconstruction of vertical seawater temperature in the surface ocean. For the further development, stable isotopes and contents of trace elements in the biogenic calcite and aragonite were analyzed in order to develop the proxy for the environments and conduct higher level of environmental reconstruction. Also we analyzed the oxygen isotopic values of molluscs, which suggest that the pearls were produced around 23-24 degree C, mainly in June to early July, which is consistent with their occurrence in the field. Therefore the pearls were produced under or close to isotopic equilibrium conditions. Furthermore, we collected sediment core MD01-2409 (41degree north, 141 degree east) at 975 m water depth on the continental margin off the northern Japan. Oxygen isotopic values of N. pachyderma (left) decrease only 1.5 ‰ from LGM to Holocene. If oxygen isotopic values of seawater decreased 1.0 ‰ because of ice sheet, the seawater temperature at the site increased only 2.5 degree. It suggests that the water temperature changes of the Oyashio water, at the depth 100-200 m, was lower than that of the water mass influenced by the Oyashio and the Tsugaru Warm Current at the depth shallower than 10 m. Less

有孔虫、珊瑚骨骼和软体动物的稳定碳和氧同位素提供了关于生物钙化过程与周围环境之间联系的详细信息。近些年来，红球藻在亚热带和热带海洋的古海洋学研究中受到了极大的关注。G.ruber有两种形态类型(G.ruber S.S.和G.ruber s.l.)：G.ruber s.s.和S.L.它们分别栖息在表层和更深的地表水中。为了建立定量重建海表面温度的指标，对在北纬30度、东经175度的太平洋采集到的红棉中的氧和碳同位素进行了分析。8月至10月，两种地貌类型的Delta18氧气值的平均差异为0.25‰，对应的水温差为1摄氏度。与有孔虫组合一起，两种形态的红色石棉ー的三角洲18OO值可以很好地代替…更定量地重建表层海洋的垂直海水温度。为进一步开发，对生源方解石和文石中的稳定同位素和微量元素含量进行了分析，以开发环境替代物，进行更高水平的环境重建。我们还分析了软体动物的氧同位素值，表明珍珠产于23-24摄氏度左右，主要在6月至7月初，这与它们在野外的产状一致。因此，珍珠是在或接近同位素平衡条件下产生的。此外，我们还在日本北部近海大陆边缘975m水深的MD01-2409(北纬41度，东经141度)岩心上采集了沉积物。从大冰期到全新世，厚皮核菌(左)的氧同位素值仅降低了1.5‰。如果冰盖使海水氧同位素值降低1.0‰，则现场海水温度仅升高2.5度。结果表明，在水深100~200m处，水温变化小于10m以下受Oyashio和Tsugaru暖流影响的水团水温变化

项目成果

Biogenic and abiogenic sedimentation in the northern East China Sea in response to sea-level change during the Late Pleistocene

• DOI: 10.1016/j.gloplacha.2006.01.013
• 发表时间: 2006-08
• 期刊: Global and Planetary Change
• 影响因子: 3.9
• 作者: H. Kawahata;M. Nohara;K. Aoki;K. Minoshima;L. Gupta

Distribution and temporal changes of lead in the surface seawsater in the western Pacific and adjacent seas derived from coral skeletons.

西太平洋及邻近海域珊瑚骨骼中表层海鱼中铅的分布和时间变化。

• 发表时间: 2006
• 期刊: Environmental Pollution (in press)
• 作者: Inoue;M.;Hata;A.;Suzuki;A.;Nohara;M.;Sikazono;N.;Wyss;Y.;Hantro;W.S.;Donghuai;S.;Kawahata;H.
• 通讯作者: H.

Terrestrial - Ocean environmental change in the northwestern Pacific from the glacial times to Holocene

• DOI: 10.1016/j.jseaes.2010.10.007
• 发表时间: 2011-04
• 期刊: Journal of Asian Earth Sciences
• 影响因子: 3
• 作者: H. Kawahata;H. Ohshima;A. Kuroyanagi

Millennial-scale variations of sea-ice expansion in the southwestern part of the Okhotsk Sea during the past 120 kyr : Age model, ice-rafted debris in IMAGES Core MD01-2412.

过去120 kyr期间鄂霍次克海西南部海冰扩张的千年尺度变化：年龄模型，IMAGES Core MD01-2412中的冰筏碎片。

• 发表时间: 2006
• 期刊: Global and Planetary Change (in press)
• 作者: Sakamoto;T.;Ikehara;M.;Uchida;M.;Aoki;K.;Shibata;Y.;Kanamatsu;T.;Harada;N.;Iijima;Katsuki;K.;Asahi;H.;Takahashi;K.;Sakai;H.;Kawahata;H.
• 通讯作者: H.

Coral skeletal tin and copper concentration at Pohnpei, Micronesia : Possible index for marine pollution by toxic anti-biofouling paints

密克罗尼西亚波纳佩岛的珊瑚骨骼锡和铜浓度：有毒抗生物污损涂料造成海洋污染的可能指数

• 发表时间: 2004
• 期刊: Environmental Pollution 129
• 作者: Inoue;M.;Suzuki;A.;Nohara;M.;Kan;H.;Edward;A.;Kawahata;H.
• 通讯作者: H.