Millennium scale environment changes of the Okhotsk sea during last 80 kyr and their phase relationship with global climate changes
Millennium scale environment changes of the Okhotsk sea during last 80 kyr and their phase relationship with global climate changes
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DOI：
10.1007/s10872-007-0054-1
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发表时间：
2007-08-01
影响因子：
2.3
通讯作者：
Ivanova, Elena Diamilevna
中科院分区：
文献类型：
--
作者：
Gorbarenko, Sergey Alexandrovich;Goldberg, Evgenia L'vovich;Ivanova, Elena Diamilevna
本文介绍了鄂霍次克海沉积物中几种古生产力指标（PP）（生物蛋白石和Ba（Si_bio，Ba_bio），有机碳（C_org）和碳酸盐Ca_carb，二氢氯和底栖有孔虫丰度（BFA））在近80 kyr的记录，分辨率约为100-300年。沉积物年龄模型的依据是AMS 14 C数据、底栖有孔虫3180记录、地球地磁场古强度和磁化率。PP值表明，在鄂霍次克海的生产力下降，随后在末次冰期急剧增加严重的长期系列。根据对鄂霍次克海冷MIS 2和暖全新世古生产力的定量估算（Gorbarenko和Goldberg，2005），认为该盆地生产力-气候变化的千年尺度关系是相似的：海洋生产力的增加与区域气候变暖有关，反之亦然。MIS 2-4期间鄂霍次克海生产力/气候振荡的PP记录与北大西洋冷Heinrich事件（HE）和格陵兰Dansgaard-Oyeshger interstadial（DOI）同时发生。观测到的持续的气候变冷事件，随后是快速、突然的变暖，与北半球的气候和环境振荡相似。大西洋和格陵兰的气候变化，证实了包括远西北太平洋在内的北方半球千年尺度气候变化的同步性，其水文和气候条件接近鄂霍次克海。N的同步性。南半球（包括鄂霍次克海）的剧烈降温和南极变暖表明，在两半球高纬度地区之间的低纬热量再分配中，“跷跷板”效应（Blunier and Brook，2001）的机制比直接NADW形成强迫更为复杂，并包含了全球大气重组。在PP中使用的一个更密切的联系在鄂霍次克海千年振荡观察到的C_org，BFA和二氢卟酚; Ba_bio增加更接近DOI。硅生物变异性与生产力变化没有明显的相关性。
The paper presents the records of several paleoproductivity proxies (PP) (biogenic opal and Ba (Si_bio, Ba_bio), organic carbon (C_org) and carbonate Ca_carb, chlorin and benthic foraminifera abundance (BFA)) in sediments of the Okhotsk Sea for the last 80 kyr with a resolution of similar to 100-300 years. The sediment age model was based on the AMS 14 C data, records of benthic foraminifera 3180, paleointensity of the Earth's geomagnetic field and magnetic susceptibility. PP values demonstrate series of severe prolonged productivity drops in the Okhotsk Sea followed by a sharp increase during the last glaciation. On the basis of quantitative estimations of the paleoproductivity in the Okhotsk Sea during the cold MIS 2 and warm Holocene (Gorbarenko and Goldberg, 2005), it is suggested that the millennium scale relationship in productivity-climate changes of this basin was similar: an increase in the sea's productivity was related with regional climate warming and vice-versa. The PP records of productivity/climate oscillations in the Okhotsk Sea during MIS 2-4 occurred contemporaneously with the North Atlantic cold Heinrich events (HE) and Greenland Dansgaard-Oyeshger interstadial (DOI). Observed successions of prolonged climate cooling events followed by rapid, abrupt warming are similar to climate and environmental oscillations in the N. Atlantic and Greenland, that confirms the millennium-scale climate changes synchronicities in the Northern Hemisphere including the far NW Pacific, the hydrology and climate conditions of which are close to those of the Okhotsk Sea. Synchronism of the N. Hemisphere severe cooling (including the Okhotsk Sea) with the Antarctic warming suggests that mechanisms of the "seesaw" effect (Blunier and Brook, 2001) in the low latitude heat redistribution between high latitudes of both hemispheres were more complicated than direct NADW formation forcing and encompasses the global atmospheric reorganization. Within the PP used a closer connection in the Okhotsk Sea millennium oscillations was observed for the C_org, BFA and chlorin; Ba_bio increases more closely to DOI. Si_bio variability does not show any evident correlation with productivity changes.