摘要
珊瑚礁的生态和经济功能依赖于珊瑚虫快速钙化所形成的文石碳酸钙骨架结构。近几十年来全球大面积珊瑚钙化率的下降虽然被认为同海洋变暖和酸化密切相关,但确切原因尚未得到证实。尤其是珊瑚碳酸钙骨骼不是直接从海水中钙化,而是在细胞包裹的半封闭、微米级厚度的钙化流体中沉淀,为相关研究带来极大困难。硼同位素-硼钙元素比体系是最近几年发展起来的研究珊瑚钙化流体化学的地球化学新手段。本文介绍了这一体系重建珊瑚钙化流体碳酸盐参数:pH、溶解无机碳(DIC)和CO^(2-)_(3)的基本原理和可靠性,重点评述了该体系在珊瑚钙化流体重建和钙化率变化机制研究中的现状和最新研究成果,以及有望取得突破的方向。
The architecture of coral reefs,which support the world’s most diverse marine ecosystem,relies heavily on the fast biogenic carbonate accretion.In recent decades,the worldwide decreasing of coral calcification rate has drawn increasing concerns.The decreasing of coral calcification rate was proposed to link with anthropogenic ocean warming and ocean acidification,but the underlying mechanism remains unknown.The aragonitic skeletons of coral accrete in a semi-isolated extracellular calcifying fluid(CF),whose chemistry properties,especially dissolved inorganic carbon(DIC_(ef))and pH_(ef),are critical in the biomineralization and growth of coral.Recently,the isotopic composition of Boron(δ^(11)B)and the B/Ca ratio in coral were suggested as the new proxies in reconstructing CF chemistry during coral growing.Here we introduce the fundamental principles of using the joint system ofδ;B-B/Ca as the proxy of CF chemistry,review the latest research progress and achievement of applying this system in reconstructing the coral calcification process,and look into the future of this research field.
作者
刘羿
陈懋卿
LIU Yi;CHEN Mao-qing(Institute of Surface-Earth System Science,School of Earth System Science,Tianjin University,Tianjin 300072,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2021年第5期1121-1129,I0003,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41922019)。
关键词
硼同位素
硼钙比
珊瑚钙化
钙化流体
海洋酸化
全球变暖
boron isotope
B/Ca ratio
corals calcification
calcifying fluid
ocean acidification
global warming
