广西科学2025，Vol.32Issue(1)：68-77,10.DOI:10.13656/j.cnki.gxkx.20250508.001
涠洲岛海水文石饱和度的变化及其对造礁石珊瑚钙化作用的影响
Changes in Aragonite Saturation State in Seawater and Effect on Calcification of Scleractinian Corals around the Weizhou Island
摘要
Abstract
To lay a scientific foundation for the conservation and restoration of the coral reefs and development of an early warning monitoring protocol,Excel Macro CO2SYS was employed to calculate the aragonite satu-ration state(ΩArag)in seawater around the Weizhou Island from the partial pressure of sea surface carbon di-oxide(pCO2),surface-seawater temperature,surface-seawater salinity and surface-seawater pH value.The effect of ΩArag on the calcification of scleractinian corals around Weizhou Island and the responses of ΩArag to the changes in temperature,salinity and pH value were analyzed.The results showed that the average seawa-ter temperature around the Weizhou Island in spring,summer,and autumn from 2006 to 2020 varied between 22.1℃ and 28.4℃ and increased gradually year by year.The average salinity ranged from 29.5 to 32.0,be-ing stable at about 31.0.pCO2 rose with fluctuations,and its average values varied between 350.96 μatm and 380.37 μatm(1 μatm=1.013 25 × 10-5 Pa),lower than the global ocean annual mean values of the same pe-riod.The average values of pH value rose with fluctuations and ranged between 7.99 and 8.24,higher than the global ocean pH values of the same period.The pCO2 in the coastal area around the Weizhou Island rose with fluctuations at a rate of+3.20 μatm/10 a,which was expected to cause surface seawater acidification at a rate of-0.002 pH/10 a and the global ocean acidification at a rate of-0.011 pH/10 a.The average ΩArag of three seasons ranged between 2.61 and 7.42,following descending order of summer＞autumn＞spring.ΩArag could not maintain more than the threshold value of 4.00 if the average values of seawater temperature,salinity,and pH value were lower than 22.1℃,25.6,and 8.12,respectively.pH value was a critical environ-mental factor that affected the variation in ΩArag.In spring,the seawater temperature and ΩArag around Weizhou Island were lower.Although the ΩArag in summer was high,the temperature in seawater was usually higher than 30℃,which was not conducive to the calcification of scleractinian corals.The high ΩArag and fa-vorable seawater temperature in autumn were beneficial to the calcification of scleractinian corals.The seawa-ter temperature rise caused by global climate change would not reduce the ΩArag around Weizhou Island,while the ΩArag decrease caused by extreme low temperature may affect the stability of coral skeleton.The stable sa-linity of Weizhou Island would not cause significant changes in ΩArag.Due to the increase of pCO2 in the global ocean,the ΩArag in the surface seawater around the Weizhou Island is expected to be less than the threshold of 4.00 in 2038.The ΩArag of the seawater around the Weizhou Island,which affects the calcification of sclerac-tinian corals,is mainly related to the seawater temperature and pH value.关键词
涠洲岛/文石饱和度/造礁石珊瑚/钙化作用/海洋酸化Key words
Weizhou Island/aragonite saturation state/scleractinian corals/calcification/ocean acidification分类
海洋学引用本文复制引用
李斌,付家想,黄雯雯,骆鑫..涠洲岛海水文石饱和度的变化及其对造礁石珊瑚钙化作用的影响[J].广西科学,2025,32(1):68-77,10.基金项目
广西自然科学基金项目(2023GXNSFBA026253),广西北部湾海洋资源环境与可持续发展重点实验室开放基金项目(MRESD-2022-B04),广西科技基地和人才专项(桂科23-026-271)资助. （2023GXNSFBA026253）
