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海气交换与呼吸作用调控下杭州湾碳酸盐体系的特征

王俊洋 王斌 李德望 徐忠胜 苗燕熠 杨志 金海燕 陈建芳

王俊洋,王斌,李德望,等. 海气交换与呼吸作用调控下杭州湾碳酸盐体系的特征[J]. 海洋学报,2021,43(9):21–32 doi: 10.12284/hyxb2021124
引用本文: 王俊洋,王斌,李德望,等. 海气交换与呼吸作用调控下杭州湾碳酸盐体系的特征[J]. 海洋学报,2021,43(9):21–32 doi: 10.12284/hyxb2021124
Wang Junyang,Wang Bin,Li Dewang, et al. Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration[J]. Haiyang Xuebao,2021, 43(9):21–32 doi: 10.12284/hyxb2021124
Citation: Wang Junyang,Wang Bin,Li Dewang, et al. Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration[J]. Haiyang Xuebao,2021, 43(9):21–32 doi: 10.12284/hyxb2021124

海气交换与呼吸作用调控下杭州湾碳酸盐体系的特征

doi: 10.12284/hyxb2021124
基金项目: 中央科研院所基本业务费专项资金项目(LORCE计划);国家自然科学基金(U1709201,41706120,41806095);浙江省自然科学基金(LQ17D060006);“全球变化与海气相互作用”专项(II期)—长江口缺氧酸化预警监测项目。
详细信息
    作者简介:

    王俊洋(1995—),男,浙江省桐乡市人,研究方向为河口碳酸盐体系。E-mail:jyocean@qq.com

    通讯作者:

    陈建芳,男,研究员,主要从事海洋生物地球化学研究。E-mail:jfchen@sio.org.cn

  • 中图分类号: P734.2+5

Characteristics of carbonate system in the Hangzhou Bay: Under the regulation of air-sea exchange and respiration

  • 摘要: 杭州湾作为典型的高浑浊度海湾,对其水体碳酸盐体系分布特征的研究相对较少。本文基于两个夏季航次(2018年和2019年)获取的调查资料,阐述夏季杭州湾水体中碳酸盐体系参数的空间分布特征,并进一步分析影响溶解无机碳偏离保守混合作用的主要过程及相对贡献。数据结果表明,杭州湾内表层溶解无机碳浓度与总碱度的变化范围分别为1 553~1 964 μmol/kg和1 577~2 101 μmol/kg,略低于长江口(1 407~2 110 μmol/kg和1 752~2 274 μmol/kg),溶解无机碳浓度和总碱度的空间分布受控于淡水与外海水混合的影响,在潮汐作用下,总体呈现出湾内低,向湾外逐渐升高的趋势。影响表层溶解无机碳非保守混合分布的主要过程中,海−气交换降低溶解无机碳浓度,呼吸作用增加溶解无机碳浓度,两个过程对溶解无机碳浓度变化量的贡献分别为(−42.3±11.7)%与(34.2±14.3)%,净效应呈现为相对平衡的状态。通过计算获得表层海水pCO2的平均值为799 μatm (675~932 μatm),海湾总体表现为大气CO2的源。此外,湾内海水碳酸盐缓冲因子的范围为12.8~23.8,对CO2的缓冲能力弱于邻近东海海水(缓冲因子平均值约为11.9),指示其与外部水体的交换可能会降低附近海域的酸化缓冲能力。相对其他河口/海湾而言,杭州湾内高浊度与强潮汐的特点使其湾内水体的碳酸盐体系分布特征具有区域特殊性。
  • 图  1  研究区域与观测站位

    Fig.  1  Study area and location of sampling station

    图  2  2019年夏季杭州湾温度与盐度关系

    浅灰色虚线为等密度线

    Fig.  2  The correlation among temperature and salinity of the Hangzhou Bay in summer 2019

    The light gray dotted line represents the isopycnic line

    图  3  2018年与2019年杭州湾夏季表层DIC浓度、TA的平面分布(单位:μmol/kg)

    Fig.  3  Distribution of DIC concentration and TA in the surface layer of the Hangzhou Bay in summer 2018 and 2019 (unit: μmol/kg)

    图  4  2018年与2019年杭州湾夏季表层pCO2的平面分布(单位:μatm)

    Fig.  4  Distribution of pCO2 in the surface layer of the Hangzhou Bay in summer 2018 and 2019 (unit: μatm)

    图  5  TA、DIC浓度与盐度之间的相互关系

    虚线与直线分别表示2018年、2019年的趋势线;红圈内展示的是北部沿岸高值站位

    Fig.  5  The correlation among TA, DIC concentration and salinity

    The dotted line and the straight line represent the trend lines of 2018 and 2019, respectively; the high-value stations along the northern coast are shown in the red circle

    图  6  2019年ΔDIC浓度与ΔTA的相关关系

    Fig.  6  The correlation of ΔDIC concentration and ΔTA in 2019

    图  7  2019年杭州湾夏季表层水中DIC浓度变化的主要影响因素及其相对贡献

    误差棒表示海水滞留时间变化对ΔDIC计算的影响

    Fig.  7  Main influencing factors and their contributions to the DIC concentration in surface layer of the Hangzhou Bay in summer 2019

    The error bars indicate the influence of changes in seawater retention time on ΔDIC calculations

    图  8  DIC浓度∶TA与盐度(a),缓冲因子与盐度(b)的相互关系,及2019年夏季杭州湾表层海水缓冲因子的平面分布(c)

    Fig.  8  The correlation of DIC concentration∶TA and salinity (a), revelle factor and salinity (b), and distribution of revelle factor in the surface layer of the Hangzhou Bay in summer 2019 (c)

    图  9  7个河口/海湾DIC浓度随盐度变化的示意图

    Fig.  9  Diagram of DIC concentration and salinity in seven different estuaries/gulfs

    表  1  航次信息与水文参数

    Tab.  1  Cruise information and hydrological parameters

    航次名称采样时间(阳历)温度/℃盐度深度/m潮汐
    2018年航次2018年8月12日、2018年8月15日29.87±0.5216.02±4.898.2±2.1大潮
    2019年航次2019年8月25−29日28.45±1.5817.34±7.8515.7±12.5小潮
      注:温度、盐度和深度数据为各个航次调查站位的平均值±相对偏差,潮汐以农历推算。
    下载: 导出CSV

    表  2  两个航次表层DIC浓度、TA、pCO2的变化范围

    Tab.  2  The variation range of DIC concentration, TA and pCO2 in surface layer of two field cruises

    航次年月DIC浓度/(μmol·kg−1)TA/(μmol·kg−1)pCO2/μatm
    2018年8月1 789~2 015 (1 921)1 822~2 100 (1 982)778~1 271 (1 085)
    2019年8月1 553~1 964 (1 805)1 577~2 101 (1 886)675~932 (799)
      注:DIC浓度、TA为实测值,pCO2为计算值,括号内为平均值。
    下载: 导出CSV

    表  3  7个北半球中高纬度河口/海湾碳酸盐体系的对比

    Tab.  3  Comparison of carbonate systems in seven different estuaries and gulfs in the North Hemisphere

    河口/海湾DIC浓度pCO2/μatm主要影响因素数据来源
    斯海尔德河口3 300~7 100 μmol/L2 200~15 500呼吸作用文献[9]
    卢瓦尔河口2 200~2 700 μmol/kg700~2 900呼吸作用/
    碳酸盐溶解
    文献[12]
    黄河口2 155~2 927 μmol/L400~750初级生产/
    碳酸盐析出
    文献[11]
    长江口1 407~2 110 μmol/kg177~1 036初级生产文献[25, 28]
    珠江口798~1 572 μmol/kg(雨季);
    2 744~3 329 μmol/kg(旱季)
    碳酸盐浓度文献[55]
    切萨皮克湾800~1 900 μmol/kg初级生产/呼吸作用文献[13]
    杭州湾1 553~1 964 μmol/kg675~932呼吸作用/海−气交换本文
      注:−代表对应时期数据不可用。
    下载: 导出CSV
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  • 收稿日期:  2021-01-29
  • 修回日期:  2021-04-21
  • 网络出版日期:  2021-06-11
  • 刊出日期:  2021-09-06

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