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入海径流对北冰洋海冰和海洋变化的影响研究

项目名称: 入海径流对北冰洋海冰和海洋变化的影响研究
项目类型: 国家自然科学基金面上项目
项目负责人: 张占海
项目成员:
项目编号: 40676003
父项目编号:
规划期:
立项时间: 2007-01-01
预期结束: 2009-12-31
实际结束:
金额(万元): 39
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项目简介

   来自欧亚大陆和北美大陆大量的入海径流是北冰洋重要的淡水来源。入海径流的变化所引起的淡水输入的变化直接影响到北冰洋盐跃层的生长和消退,进而影响海冰的热力过程和海洋温盐环流。而且由北冰洋的海冰和低盐海水输出又更直接影响北大西洋北部深层对流的强度,进而影响全球海洋温盐环流,对气候变化具有显著影响,从而使北冰洋在全球水圈循环中起着非常重要的作用。本项目拟从收集整理入海径流资料入手,诊断和分析北冰洋入海径流的变化特征和规律;在已有长期海冰模式研究基础上,发展包括淡水收支(入海径流和海冰漂移)动力学过程的北冰洋海冰-海洋耦合模式。通过资料分析和数值模拟探索淡水输运对北冰洋上层海水结构、海水-海冰间的通量交换、海冰分布变化和北大西洋深层水的厚度的影响机制,完善对北冰洋海冰变化物理机制的认识。

introduction

   Runoff from Eurasian and North American rivers represents a significant source of freshwater to the Arctic Ocean. The variations of runoff influence the formation of the Arctic Ocean halocline through controlling the freshwater input to the Arctic Ocean. The changes of runoff also affect sea ice thermodynamics and thermohaline circulation. Moreover, the freshwater output from the Arctic Ocean, in the form of sea ice and reduced salinity seawater, has potential influence on the overturning cell of the global ocean through controlling the intensity of convection in the North Atlantic. Therefore, the freshwater balance in the Arctic Ocean plays important roles in global climate and water cycle. In this project, we will collect quality-controlled information of Arctic runoff observations and analyze seasonal-to-interannual variability of the Arctic runoff. Meanwhile, we will develop and improve a sea ice-ocean coupled model suitable for this project based on our long-term research on sea ice model. Combining the observational Arctic runoff analysis and sea ice-ocean coupled model, we will implement a series of model experiments, and explore the impacts of Arctic runoffs on the upper Arctic ocean structure, flux exchanges between sea ice and ocean, sea ice distributions, and the North Atlantic Deep Water formation, and associated possible mechanisms.


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