热带岛屿河口碳酸盐体系及其影响因素探讨

——以海南岛万泉河口为例

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中图分类号：P734.4；P736.2 文献标志码：A 文章编号：1005-9857（2025）10-0121-10

Abstract：The confluence，migration and transformation of terrestrial material and marine authigenic organic mater in the estuary and ofshore significantly affect the estuarine carbon cycle process.In the surface waters of the Wanquan River Estuary，an investigation was conducted into the distribution and interrelation of water temperature，salinity，disolved inorganiccarbon（DIC），and totalalkalinity（TA）.Furthermore，the mechanism governing the distribution of carbonates was discussed.During both high-flow and rainless periods， the concentrations of these parameters were measured，and their spatiotemporal distribution and relationships were evaluated.In the surface waters of the Wanquan River Estuary，the concentrations of DICand TAexhibited wide fluctuations，ranging from 433μmol/kg to and from 454μmol/kg to 2324μmol/kg ，respectively. The water temperature was evenlydistributed，while salinity，DIC，andTA increased spatiall from theestuary towards the sea.Strong positive linear corelations were observed betwee DICandTA，as wellas between these parameters andsalinity. During the high-flow period，deficiencies in DIC and TA were noted in low-salinity areas （<10 ），with conservative behaviorsoccurring else where；during therainlessperiod，however，conservative behaviors were observed throughout thestudyarea.The distribution characteristics andconservative behaviorof carbonates in the studyarea were primarily influenced bythe interactionof water mases，biological absorption，super saturation setlementofcalcium carbonate， andtheinflux of high-DIC water from the Qiongdong upweling.Additionally，the differences incarbonateconservation behavior betweenthe high-flowandrainlessperiods were mainlyatributedtoriverrunoffand thecarbonatecontentof the river itself. This study discusses the seasonal changes and main influencing proceses of the carbonate system inthe Wanqua River Estuary，which canprovide dataand theoretical support for theconstructionofaregional carbon budget.

Keywords： Total alkalinity（TA），Dissolved inorganic carbon（DIC），Carbonate system，Conservative behavior，Interaction between water masses，Wanquan River estuary

0 引言

河口是物质和能量交换最频繁和受人类干扰最显著的地区，强烈地影响着陆源物质进入海洋的输出通量，发挥着化学反应器和过滤器的作用，也是全球碳循环的重要组成部分。（剩余13292字）