运用生物分子标志物和分子地层学、地层年代学、同位素地球化学、微体古生物学、生物地球化学等多学科交融方法，研究和探索北极气候变暖对白令海、北冰洋环境变异及其生态响应与全球性气候事件ENSO存在的关联。这对于我们寻找北极气候变化规律和了解快速变化中的北极海洋有着重要科学意义。利用沉积物中UK37与温度特性建立起晚全新世以来上层海水温度变化模式，重点辨识近200年来ENSO变率；利用特定藻类标志物及其δ13C在地层中的垂向变量反演浮游植物生产量和生态演替；联合应用环境分子标志物的精细结构和分子组合特征，寻找白令海和北冰洋ENSO响应特征（水温、浮游植物生产量和种群结构不稳定特征等），以及不同时空尺度的分子地层对比，追索北极快速变化中海洋藻类消长与ENSO之间的联系，进而揭示ENSO和北极气候变暖对浮游植物群落结构到底产生了多大影响，影响过程又如何？以及这一上层海洋生物过程对全球气候的反馈作用。

A couple of scientific means will be used in this project, such as record of molecular markers and molecular stratigraphy with chronology,isotop-geochemistry and marine biogeochemistry,for exploring environmental variation as well as the ecological response to climate change in the Beiling Sea and the Arctic Ocean related to ENSO event . The characteristics of long-chain alkenones(UK37) and temperature will be employed for identifying and reconstructing ENSO events Since the Late Holocene, particularly during the recent 200 years. . The biological and variation of productivity will be evaluated by measuring vertical variable of specific biomarker.The biomass and succssion proces se of cyanobacteriaand phytoplankton are going to be reconstructed by using algal-bectereia biomaker and its δ13C. By coupling applying fine structure and their molecular assembled feature index of manifold biomarker for environment and climate, responsed characteristics of ENSO（surface seawater,marine bacteria,variation characteristics of plant plankton biomass and population structure change）will be discovered in the Beiling Sea and the Arctic Ocean. The evidence of connection can be traced betweenthe blooming and declining event sof bacteria- algae and ENSO event. Based on these information, the conclusion is easily to be reached: how much is bacteria and microbial community structure and primary production influneced by ENSO evnnt and climate waring in the Acrtic ocean? And what is the possible response mechanism of ecosystem during the process.