海温变化对海洋酸化及溶解氧影响的模拟研究

工业革命以来，大气CO2从~280ppm增加到~410ppm。大气CO2增加通过温室效应导致全球变暖。同时，海洋吸收CO2，降低海水pH值，造成海洋酸化。全球变暖引起的海温变化会通过一系列海洋关键物理、化学和生物过程，影响海洋酸化和海洋中的溶解氧，从而对海洋生物、生态系统和生物地球化学循环产生重要影响。.本项目拟利用维多利亚大学地球系统气候模式进行一系列模拟试验，在大气CO2增加的大背景下，量化全球变暖引起的海温变化通过对海洋不同关键物理、化学和生物过程，包括海洋混合与环流、CO2和O2溶解度、碳酸盐化学反应速率、浮游植物生长和死亡速率、生物碎屑分解速率等过程的直接作用，对海洋酸化和溶解氧的影响。揭示这些物理、化学和生物过程的作用机理和相互作用机制，并比较在不同海域和深度，这些过程对海洋酸化和溶解氧的不同影响。本项目拟进行的研究对更好地预估未来海洋酸化、氧储量和生态系统变化具有重要意义。

Since the preindustrial time, atmospheric CO2 concentration has increased from ~280 ppm to ~410 ppm. Increasing atmospheric CO2 causes global warming through the greenhouse effect. Meanwhile, the absorption of anthropogenic CO2 by the ocean decreases seawater pH, causing ocean acidification. Warming-induced ocean temperature changes, by altering some key ocean physical, chemical and biological processes, could in turn affect ocean acidification and ocean dissolved oxygen, triggering important effects on marine organisms, ecosystems and biogeochemical cycles..In this project, a coupled climate-carbon cycle model (UVic ESCM, University of Victoria Earth System Climate Model) will be used. This project aims to quantify the direct effects of some key ocean processes (including ocean mixing and circulation, CO2 and O2 solubility, carbonate reaction rates, phytoplankton growth and mortality rates, and detritus remineralization rate) on ocean acidification and dissolved oxygen. We would investigate the interactions between these physical, chemical and biological processes, and compare their different effects on ocean acidification and dissolved oxygen in different ocean areas and depths. This project would provide important implications for the projections of future changes in ocean acidification, oxygen and ecosystems.