Recognition and Comparison of Records of the 1983 CaliforniaEl Nino in Anaerobic Basins off Southern California

1983年加州南加州厌氧盆地厄尔尼诺记录的识别与比较

• 批准号: 8620446
• 负责人: Richard Casey
• 金额: $ 4.6万
• 依托单位: University of San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-05-01 至 1990-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8620446&HistoricalAwards=false
• 关键词: Recognition; Comparison; Records; 1983; CaliforniaEl

Previous research concerning the effects of the 1983 California El Nino on living radiolarians in the plankton and the recognition of El Nino events in sediments is proposed to be continued in an attempt to recognize that 1983 event, documented in the plankton, in the sediments from three anaerobic southern California basins. Radiolarians from plankton tows taken during the initiation, peak, and waning of the 1983 El Nino displayed a sequence of radiolarian characteristics of each phase of that El Nino (initiation, peak, and waning). Preliminary investigations of box-core material collected from the Santa Barbara Basin in the summer of 1985 suggest that this same sequence may be preserved in the surficial sediment of that basin. A new method of freezing that surficial and shallow sediment immediately after coring has allowed collection of the most complete intact sedimentary record from the three southern California anaerobic basins (Santa Barbara, Santa Monica, and San Pedro). The PIs propose to carefully subsample these frozen sediments in an attempt to; (1) recognize the 1983 event in each basin, (2) compare the known radiolarian sequence from the 1983 plankton tows with the sequences from each basin, and (3) compare the event and sequence of each basin. This new technique will make it possible to examine the geologic record for the frequency and history of the large El Nino climate events off California.

先前关于1983年加州 厄尔尼诺现象对浮游生物中活放射虫的影响 在沉积物中识别厄尔尼诺事件的建议， 继续试图承认1983年的事件， 在浮游生物中，在三个厌氧南方的沉积物中， 加州盆地。 从浮游生物中提取的放射虫 1983年厄尔尼诺现象的开始、高峰和减弱显示了一种 El各期放射虫特征序列 Nino（起始、峰值和衰减）。 初步调查 从圣巴巴拉盆地收集的盒式岩心材料， 1985年夏天的研究表明， 保存在盆地表层沉积物中 一种新方法 冻结表层和浅层沉积物， 取芯采集了最完整的 加州南部三个厌氧区的沉积记录 盆地（圣巴巴拉、圣莫尼卡和圣佩德罗）。 法律与正义党 建议仔细地对这些冻结的沉积物进行取样， 尝试;（1）承认1983年事件在每个盆地，（2） 将1983年浮游生物中已知的放射虫序列 与来自每个盆地的序列进行比较，以及（3）比较 事件和序列。 这项新技术将使 有可能检查频率的地质记录， 加州附近大型厄尔尼诺气候事件的历史。