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    中国东海的224Ra

    门武 刘广山 陈敏 黄奕普

    门武, 刘广山, 陈敏, 黄奕普, 2011. 中国东海的224Ra. 地球科学, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106
    引用本文: 门武, 刘广山, 陈敏, 黄奕普, 2011. 中国东海的224Ra. 地球科学, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106
    MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. 224Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106
    Citation: MEN Wu, LIU Guang-shan, CHEN Min, HUANG Yi-pu, 2011. 224Ra in the Seawater of the East China Sea. Earth Science, 36(6): 999-1008. doi: 10.3799/dqkx.2011.106

    中国东海的224Ra

    doi: 10.3799/dqkx.2011.106
    基金项目: 

    国家"973"项目 2005CB422300

    详细信息
      作者简介:

      门武(1981-), 男, 博士, 从事同位素海洋学研究

      通讯作者:

      刘广山, E-mail: lgshan@xmu.edu.cn

    • 中图分类号: P736

    224Ra in the Seawater of the East China Sea

    • 摘要: 用锰纤维富集—射气法测量了东海水体中的224Ra, 研究了东海夏季和冬季水体中224Ra的水平与垂直分布, 夏季224Ra比活度为<LLD~5.88Bq/m3, 平均值为0.85Bq/m3; 冬季为<LLD~7.50Bq/m3, 平均值为0.72Bq/m3; 两个季节表层水224Ra的分布趋势大致相同, 随着离岸距离的增加, 水体中224Ra的活度很快降低, 高224Ra浓度海区位于离岸100km的范围内, 为0.5~7.5Bq/m3.黑潮流224Ra活度最低, <0.13Bq/m3.中部陆架水中的224Ra浓度为0.13~0.50Bq/m3.东海水体中的224Ra呈现为2种不同的垂直分布形式.利用一维稳态模型, 由水体中224Ra的水平分布计算出该海域的水平涡动扩散系数为(7.1~88.9)×106cm2/s, 垂直涡动扩散系数为2.18~163cm2/s.利用224Ra的垂直分布估算了浙江沿岸上升流的流速, 夏季为(8.4~13.3)×10-3cm/s, 冬季为(16.3~16.8)×10-3cm/s.

       

    • 图  1  采样站位

      Fig.  1.  Sampling stations

      图  2  各断面表层水224Ra的分布(S代表夏季,W代表冬季)

      Fig.  2.  224Ra distributions in the surface water of the East China Sea

      图  3  东海224Ra的浓度与浊度(a)和盐度(b)的关系

      Fig.  3.  Correlations between 224Ra concentration and turbidity (a) or salinity (b) in the seawater of the East China Sea

      图  4  东海224Ra的垂直分布

      Fig.  4.  The vertical distributions of 224Ra in the East China Sea

      图  5  07断面温盐等值分布

      Fig.  5.  The contour distributions of temperature and salinity in transect 07

      表  1  夏季航次东海水体中的224Ra浓度

      Table  1.   224Ra concentrations in the seawater of the East China Sea during summer cruise

      站位 纬度(°N) 经度(°E) 离岸距离(km) 水深(m) 层位(m) 温度(℃) 盐度 浊度(FTU) 224Ra (Bq/m3)
      S0401 31.64 122.65 72.8 35 0 25.41 24.59 1.16 0.69±0.03
      S0402 31.80 123.05 113.4 43 0 25.31 28.55 0.64 0.35±0.02
      S0404 32.14 124.00 210.3 44 0 22.53 28.65 0.40 0.35±0.02
      S0406 32.53 124.94 308.1 59 0 22.21 30.37 0.40 0.25±0.02
      S0406 32.53 124.94 308.1 59 10 21.21 30.15 0.37 0.53±0.03
      S0406 32.53 124.94 308.1 59 20 13.16 32.29 0.64 0.54±0.03
      S0406 32.53 124.94 308.1 59 30 11.96 32.81 1.95 1.15±0.06
      S0406 32.53 124.94 308.1 59 50 11.95 32.92 35.47 1.58±0.08
      S0408 32.83 125.74 400.4 94 0 21.42 31.68 0.28 0.18±0.02
      S0408 32.83 125.74 400.4 94 10 21.28 31.69 0.28 0.36±0.02
      S0408 32.83 125.74 400.4 94 30 14.34 32.98 0.24 0.22±0.02
      S0408 32.83 125.74 400.4 94 50 14.17 34.11 5.78 0.35±0.02
      S0408 32.83 125.74 400.4 94 75 14.17 34.11 7.45 1.58±0.08
      S0501 31.50 122.33 40.8 15 0 25.64 21.36 17.46 3.68±0.18
      S0501 31.50 122.33 40.8 15 5 22.46 28.41 80.53 5.15±0.26
      S0501 31.50 122.33 40.8 15 12 22.16 29.53 122.16 5.88±0.30
      S0502 31.42 122.71 76.5 42 0 25.24 26.97 0.55 0.51±0.02
      S0503 31.34 123.17 121.0 37 0 24.65 27.59 0.52 0.80±0.02
      S0504 31.26 123.61 164.7 50 0 25.41 28.82 0.18 0.79±0.04
      S0505 31.17 124.18 220.1 49 0 25.91 27.98 0.31 0.43±0.02
      S0506 31.06 124.72 272.7 51 0 25.16 28.07 0.67 0.41±0.02
      S0508 30.84 125.86 368.4 75 0 22.08 32.45 0.70 0.12±0.01
      S0508 30.84 125.86 368.4 75 10 21.60 32.62 0.61 0.31±0.02
      S0508 30.84 125.86 368.4 75 30 20.68 32.70 0.55 0.24±0.02
      S0508 30.84 125.86 368.4 75 50 17.52 33.51 6.11 0.43±0.02
      S0508 30.84 125.86 368.4 75 65 17.41 33.58 21.07 1.63±0.08
      S0702 29.21 122.46 54.9 56 0 24.34 29.99 1.56 1.86±0.08
      S0703 29.10 122.64 76.6 55 0 24.45 31.20 1.84 1.01±0.05
      S0703 29.10 122.64 76.6 55 10 23.68 31.50 1.54 0.81±0.04
      S0703 29.10 122.64 76.6 55 20 20.07 34.31 0.61 0.84±0.04
      S0703 29.10 122.64 76.6 55 30 19.82 34.39 2.02 0.94±0.05
      S0703 29.10 122.64 76.6 55 50 19.82 34.39 3.01 1.51±0.07
      S0705 28.91 123.09 124.6 70 0 25.82 32.36 0.89 0.56±0.03
      S0705 28.91 123.09 124.6 70 10 25.82 32.37 0.95 0.62±0.03
      S0705 28.91 123.09 124.6 70 30 24.95 34.08 0.64 0.45±0.03
      S0705 28.91 123.09 124.6 70 50 20.08 34.37 4.18 0.40±0.02
      S0705 28.91 123.09 124.6 70 64 19.98 34.38 4.95 1.29±0.07
      S0707 28.52 123.78 204.8 78.6 0 27.95 32.89 0.21 0.29±0.01
      S0708 28.36 124.24 252.5 96 0 28.00 31.97 0.24 0.78±0.04
      S0708 28.36 124.24 252.5 96 10 28.00 31.96 0.24 0.32±0.02
      S0708 28.36 124.24 252.5 96 30 24.56 33.99 0.24 0.01±0.01
      S0708 28.36 124.24 252.5 96 50 23.91 34.09 0.18 <LLD
      S0708 28.36 124.24 252.5 96 65 23.48 34.05 0.15 0.25±0.01
      S0708 28.36 124.24 252.5 96 75 19.94 34.35 0.70 1.04±0.05
      S0801 27.87 121.25 33.3 18 0 24.41 30.22 5.50 2.47±0.13
      S0802 27.75 121.45 55.3 29 0 26.69 31.66 2.53 2.28±0.11
      S0804 27.51 121.94 110.1 78 0 26.91 32.82 0.37 0.28±0.01
      S0806 27.24 122.48 172.4 98 0 28.51 34.44 0.95 0.14±0.01
      S0901 27.08 122.83 211.4 110 0 29.15 33.36 0.18 0.22±0.01
      S0903 26.49 122.99 0 28.66 34.15 0.15 0.12±0.01
      S0905 25.84 123.15 0 29.58 34.29 0.09 0.25±0.01
      S1002 26.72 120.78 57.2 50 0 25.45 32.22 0.98 1.39±0.07
      S1003 26.59 121.00 83.1 67 0 27.30 31.62 0.76 0.84±0.11
      S1004 26.38 121.30 120.5 79 0 28.18 33.07 8.42 0.51±0.04
      S1004 26.38 121.30 120.5 79 10 26.22 32.97 8.43 0.20±0.02
      S1004 26.38 121.30 120.5 79 30 25.76 33.21 8.42 0.33±0.03
      S1004 26.38 121.30 120.5 79 50 24.91 33.70 1.02 0.58±0.03
      S1004 26.38 121.30 120.5 79 60 24.61 34.02 2.15 0.84±0.04
      S1004 26.38 121.30 120.5 79 75 24.59 34.02 4.73 1.00±0.05
      S1006 25.98 121.93 199.1 110 0 28.65 33.08 0.16 0.21±0.01
      S1008 25.55 122.62 281.5 815 0 28.11 33.56 6.06 0.32±0.02
      S1008 25.55 122.62 281.5 815 10 27.15 33.65 5.49 0.17±0.01
      S1008 25.55 122.62 281.5 815 30 25.51 33.93 5.68 0.19±0.01
      S1008 25.55 122.62 281.5 815 50 24.37 34.08 5.43 0.17±0.01
      1010 25.19 123.32 360.5 1769 0 29.58 34.29 0.09 0.09±0.01
      范围值 111.95~29.58 21.36~34.44 0.09~122.16 <LLD ~5.88
      平均值 23.45 32.05 6.13 0.85
      下载: 导出CSV

      表  2  冬季航次东海水体中的224Ra浓度

      Table  2.   224Ra concentrations in the seawater of the East China Sea during winter cruise

      站位 纬度(°N) 经度(°E) 离岸距离(km) 水深(m) 层位(m) 温度(℃) 盐度 浊度(FTU) 224Ra (Bq/m3)
      W0402 31.78 123.05 113.4 41 0 10.64 32.51 6.96 1.43±0.14
      W0404 32.12 124.00 210.3 45 0 9.89 32.23 4.64 0.47±0.05
      W0406 32.53 124.93 308.1 58 0 12.49 33.98 5.86 1.28±0.11
      W0408 32.87 125.83 400.4 101 0 15.87 34.35 1.34 0.38±0.03
      W0501 31.50 122.33 40.8 15 0 8.24 29.79 53.36 7.50±0.62
      W0502 31.42 122.70 76.5 41 0 14.5 33.89 6.84 0.50±0.04
      W0503 31.34 123.16 121.0 40 0 12.97 33.43 5.62 0.41±0.03
      W0504 31.26 123.61 164.7 51 0 13.5 33.60 3.05 0.37±0.05
      W0505 31.16 124.18 220.1 47 0 13.24 33.54 5.86 0.81±0.07
      W0506 31.06 124.72 272.7 51 0 13.53 33.64 8.67 0.71±0.07
      W0508 30.84 125.69 368.4 76 0 15.64 33.98 4.88 0.31±0.03
      W0508 30.84 125.69 368.4 76 10 15.64 33.98 5.13 0.34±0.04
      W0508 30.84 125.69 368.4 76 20 15.65 33.98 5.74 0.29±0.05
      W0508 30.84 125.69 368.4 76 30 15.66 33.98 5.98 0.39±0.06
      W0508 30.84 125.69 368.4 76 40 15.66 33.98 5.98 0.60±0.07
      W0508 30.84 125.69 368.4 76 50 15.66 33.98 5.98 1.01±0.09
      W0508 30.84 125.69 368.4 76 69 15.69 34.00 6.72 1.22±0.08
      W0510 30.64 126.94 489.9 101 0 17.44 34.19 0.37 0.16±0.01
      W0512 30.44 127.96 590.2 404 0 19.03 34.59 0.13±0.02
      W0513 30.33 128.62 654.7 854 0 18.45 34.56 <LLD
      W0604 31.96 126.94 114 0 17.86 34.49 0.12 0.10±0.01
      W0606 31.39 127.62 131 0 18.14 34.47 0.08±0.01
      W0608 30.83 128.21 517 0 18.83 34.60 0.07±0.01
      W0701 29.34 122.25 30.0 16 0 9.32 28.72 217.3 5.29±0.51
      W0703 29.07 122.62 76.6 53 0 13.37 33.73 3.3 0.41±0.04
      W0703 29.07 122.62 76.6 53 10 13.36 33.73 3.18 0.25±0.02
      W0703 29.07 122.62 76.6 53 20 13.43 33.74 3.42 0.46±0.05
      W0703 29.07 122.62 76.6 53 30 13.55 33.79 3.54 0.56±0.06
      W0703 29.07 122.62 76.6 53 40 13.63 33.83 3.85 0.58±0.05
      W0703 29.07 122.62 76.6 53 50 13.72 33.86 4.15 0.67±0.06
      W0705 28.91 123.09 124.6 69 0 16.17 34.57 1.59 0.43±0.04
      W0708 28.36 124.24 252.5 97 0 17.32 34.51 0.98 0.20±0.02
      W0710 27.91 125.16 355.8 107 0 18.61 34.66 0.86 0.25±0.03
      W0712 27.46 126.12 462.8 820 0 22.09 34.68 0.12±0.02
      W0802 27.75 121.44 55.3 29 0 11.48 30.78 3.05 1.06±0.11
      W0804 27.48 121.91 110.1 79 0 16.85 33.70 0.49 0.50±0.05
      W0806 27.24 122.48 172.4 95 0 19.61 34.40 0.12 0.14±0.01
      W0901 27.08 122.83 211.4 111 0 19.36 34.65 0.12 0.17±0.02
      W1002 26.72 120.78 57.2 52 0 11.85 30.87 1.59 0.98±0.09
      W1004 26.38 121.30 120.5 80 0 16.11 33.18 0.61 0.18±0.01
      W1004 26.38 121.30 120.5 80 10 15.94 33.18 0.73 0.23±0.01
      W1004 26.38 121.30 120.5 80 20 15.80 33.18 1.90 0.24±0.02
      W1004 26.38 121.30 120.5 80 30 15.75 33.16 2.81 0.31±0.03
      W1004 26.38 121.30 120.5 80 40 15.70 33.16 1.89 0.82±0.07
      W1004 26.38 121.30 120.5 80 50 15.75 33.16 2.69 0.92±0.08
      W1006 25.98 121.95 199.1 104 0 21.75 34.57 0.28±0.03
      W1008 25.55 122.62 281.5 750 0 24.35 34.47 0.03±0.00
      W1010 25.18 123.29 360.5 1770 0 24.57 34.66 0.03±0.01
      范围值 8.24~24.57 28.72~34.68 0.12~217.34 < LLD~7.50
      平均值 15.70 33.60 10.03 0.72
      下载: 导出CSV

      表  3  东海水体的水平涡动扩散系数(106cm2/s)

      Table  3.   Horizontal eddy diffusion coefficients of the East China Sea

      断面 夏季 冬季
      04 21.8 42.2
      05 7.1 17.9
      07 27.8 31.5
      08 24.0 72.4
      10 88.9 30.5
      范围值 7.1~88.9 17.9~72.4
      平均值 33.9 38.9
      下载: 导出CSV

      表  4  东海水体的垂直涡动扩散系数(cm2/s)

      Table  4.   Vertical eddy diffusion coefficients of the East China Sea

      站位 夏季 冬季
      0406 16.9
      0408 28.0
      0501 15.3
      0508 22.0 22.5
      0703 84.6 163.0
      0705 3.14
      0708 2.18
      1004 32.4 18.0
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2011-03-18
    • 网络出版日期:  2021-11-10
    • 刊出日期:  2011-06-15

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