Temporal Variations in Molecular Records of Sea Surface Temperatures & Plankton Productivity: Assessment of High Resolution Signals in Sediment Trap Particulates, etc.

海面温度分子记录的时间变化

• 批准号: 9303672
• 负责人: Simon Brassell
• 金额: $ 12.42万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1995-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9303672&HistoricalAwards=false
• 关键词: Temporal; Variations; Molecular; Records; Sea

Temporal Variations of Molecular Records of Sea Surface Temperatures & Plankton Productivity: Assessment of High Resolution signals in Sediment Trap particulates, etc. This research is determining the temporal variability in alkenone production and in the alkenone unsaturation index (UK37) used in the evaluation of sea surface temperature (SST) variations. Analyses are being done on sediment trap materials collected in the Gulf of California at 2 week intervals during the period August 1990 to February 1993. The samples provide an opportunity to test fluctuations in UK37 through multiple nutrient and plankton productivity cycles (including bloom periods of Emiliania huxleyi) over an annual temperature range of ca. 15 Degree C and to directly compare the molecular temperature values with measured SST. Thus, the proposed study will test the veracity of UK37, as defined for normal marine conditions in Pacific waters, over multiple seasonal oscillations and through a broad temperature range. The investigation is also evaluating the molecular record of marine plankton biomass and their diversity through multiple seasonal cycles. The concentration profiles observed for biologically specific compounds will be compared with independent plankton counts obtained from concurrent micropaleontological studies on the same samples by other investigators. Thus, molecular trends will be tested as signals of temporal variability in plankton population dynamics. The analyses will enhance the of molecular signals of environmental and climatic change in the sediment record.//

海表面温度分子记录的时间变化&AMP浮游生物生产力：评估沉积物、圈闭颗粒等中的高分辨率信号。这项研究正在确定用于评估海表面温度(SST)变化的烯酮产量和烯酮不饱和指数(UK37)的时间变异性。正在对1990年8月至1993年2月期间在加利福尼亚州海湾每隔两周收集一次的沉积物捕集器材料进行分析。这些样本提供了一个机会，通过多个营养物质和浮游生物生产力周期(包括虎斑斑潜蝇的开花期)，在大约15摄氏度的年温度范围内测试UK37的波动，并直接将分子温度值与测量的SST进行比较。因此，拟议的研究将测试UK37在太平洋水域的正常海洋条件下，在多个季节振荡和广泛的温度范围内的准确性。调查还在评估海洋浮游生物生物量的分子记录及其通过多个季节循环的多样性。观察到的生物特定化合物的浓度分布将与其他研究人员在同一样本上同时进行的微古生物学研究中获得的独立浮游生物计数进行比较。因此，分子趋势将被测试为浮游生物种群动态的时间变异性的信号。这些分析将增强沉积物记录中环境和气候变化的分子信号。