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

先前关于1983年加利福尼亚厄尔尼诺现象对浮游生物中活放射虫的影响和沉积物中厄尔尼诺事件的研究被建议继续进行，以试图识别1983年的事件，记录在浮游生物中，在三个厌氧南加州盆地的沉积物中。在1983年厄尔尼诺开始、高峰和减弱期间从浮游生物群落中采集的放射虫显示了该厄尔尼诺每个阶段（开始、高峰和减弱）的放射虫特征序列。1985年夏天从圣巴巴拉盆地收集的箱芯材料的初步调查表明，在该盆地的表层沉积物中可能保存了相同的序列。在取心后立即冻结表层和浅层沉积物的一种新方法，使得从南加州三个厌氧盆地（圣巴巴拉、圣莫尼卡和圣佩德罗）收集到最完整的完整沉积记录成为可能。pi建议仔细取样这些冰冻沉积物，试图；(1)识别各盆地的1983年事件；(2)将1983年浮游生物拖带的已知放射虫序列与各盆地的序列进行比较；(3)将各盆地的事件与序列进行比较。这项新技术将使研究加州附近厄尔尼诺大气候事件的频率和历史的地质记录成为可能。

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.