「みらい」 MR03-K04 Leg5 二酸化炭素分圧 (pCO2)

最終更新日: 2017-04-11
: MR03-K04 Leg5
: Processed (PI)
: JAMSTEC
: 二酸化炭素濃度, 気温, 気圧, 風向, 風速, 表面水温, 表面塩分
:
海洋 > 海洋化学 > 二酸化炭素

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村田 昌彦(海洋科学技術センター)
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機器名:
大気海水CO2連続測定装置 ( - MR10-06)
測定方法等の詳細はデータブック(“WHP P6, A10, I3/I4 REVISIT DATA BOOK” Vol.1, Vol.2, Vol.3)を参照してください。

      Investigator: Dr. Akihiko Murata
      Organization: Research Institute for Global Change (RIGC)/Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
      Address: 2-15, Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan

Vessel:
Vessel Name: Mirai
Vessel ID: JNSR
Country: Japan
Vessel Owner: JAMSTEC

Equilibrator Design:
Equilibrator type: Shower-head type equilibrator
Equilibrator volume (L): 1.2
Water_Flow_Rate (L/min): 5-8
Headspace_Gas_Flow_Rate (L/min): 0.6-0.8
Vented: During equilibrium, closed circulation of air. When measured by NDIR, vented to ambient air.

Measurement Method:
   Continuous underway measurements of atmospheric and surface seawater pCO2 were made with the CO2 measuring system (Nippon ANS, Ltd) installed in the R/V Mirai of JAMSTEC. The system comprises of a non-dispersive infrared gas analyzer (NDIR; BINOSR model 4.1, Fisher-Rosemount) or the variations, an air-circulation module and a showerhead-type equilibrator. To measure concentrations (mole fraction) of CO2 in dry air (xCO2a), air sampled from the bow of the ship (approx. 30 m above the sea level) was introduced into the NDIR through a dehydrating route with an electric dehumidifier (kept at ~ 2 °C), a Perma Pure dryer (GL Sciences Inc.), and a chemical desiccant (Mg(ClO4)2). The flow rate of the air was 500 ml min-1. To measure surface seawater concentrations of CO2 in dry air (xCO2s), the air equilibrated with seawater within the equilibrator was introduced into the NDIR through the same flow route as the dehydrated air used in measuring xCO2a. The flow rate of the equilibrated air was 600 - 800 ml min-1. The seawater was taken by a pump from the intake placed at the approx. 4.5 m below the sea surface. The flow rate of seawater in the equilibrator was 500 - 800 ml min-1.
   The CO2 measuring system was set to repeat the measurement cycle such as 4 kinds of CO2 standard gases (Table 1), xCO2a (twice), xCO2s (7 times). This measuring system was run automatically throughout cruises by a PC control. Effects of water temperature increased between the inlet of surface seawater and the equilibrator on xCO2s were adjusted based on Gordon and Jones (1973), although the temperature increases were slight, being ~ 0.5 °C at maximum.

Gordon, L. I. and L. B. Jones (1973), The effect of temperature on carbon dioxide partial pressure in seawater. Mar. Chem., 1, 317 - 322.

Manufacturer of Calibration Gas:
   Concentrations of CO2 of the standard gases are listed in Table 1, which were calibrated by the JAMSTEC primary standard gases after 2000 (MR00-K01 and later). Before that time, the standard gases were calibrated against the scale of the Meteorological Research Institute, Tsukuba, Japan, and fitted to the 1985 World Meteorological Organization scale by using the equation of Inoue et al. (1995). The CO2 concentrations of the primary standard gases were calibrated by C. D. Keeling of the Scripps Institution of Oceanography, La Jolla, CA, USA. The values are 230.33 ppm (Cyl. No. 11325), 259.74 (11326), 279.67 (11327), 308.93 (11328), 328.25 (11329), 348.79 (11330), 369.55 (11331), 389.54 (11333), 411.60 (11334), 440.94 (11335), 460.42 (11336), and 478.54 (11337).
   Since differences of concentrations of the standard gases between before and after the cruise were all allowable (< 0.1 ppmv), the averaged concentrations (Table 1) were adopted for the subsequent calculations.

Table 1. Concentrations of standard gases used in individual cruises.

Cruise #STD1STD2STD3STD4Remark
MR98-06----No records left
MR98-K01270.28330.95360.48410.85
MR99-K02270.28330.95360.48410.85
MR99-K04270.26330.98360.43410.85
MR99-K05247.74304.98333.32382.57
MR00-K01329.71359.17409.39439.94
MR00-K03269.60329.71359.17439.94
269.60329.71359.17409.39
MR00-K06246.95305.13333.44382.74
305.13333.44382.74409.40
MR01-K02269.60329.74359.22409.39
MR01-K03269.60329.74359.22409.39
MR01-K04 Leg1298.56321.17370.75439.95
MR01-K04 Leg2298.56321.17370.75439.95
MR01-K05 Leg1-2247.99298.56321.17370.75
MR01-K05 Leg3-4247.99298.56321.17370.75
MR02-K03269.20329.52359.11408.76
MR02-K05 Leg1246.69297.83320.05391.66
MR03-K01270.16340.21371.39389.97
MR03-K02270.08328.87359.10409.23
MR03-K04 Leg1270.08328.87359.10409.23
MR03-K04 Leg2270.08328.87359.10409.23
MR03-K04 Leg4270.08328.87359.10409.23
MR03-K04 Leg5268.84330.16369.37414.39
MR04-04268.85328.87369.39414.43
MR04-05268.84330.16369.37414.39
MR05-02262.94320.42381.04420.76
MR05-05 Leg1262.94320.42381.04420.76
MR05-05 Leg2262.94320.42381.04420.76
MR05-05 Leg3262.94320.42381.04420.76
MR06-04 Leg1289.76349.00393.75439.72
MR06-04 Leg2289.76349.00393.75439.72
MR07-04289.77349.02393.77439.75
MR07-05289.77349.02393.77439.75
MR07-06 Leg1270.02330.40369.28419.68
MR07-06 Leg2270.02330.40369.28419.68
MR09-01 Leg1270.22330.43360.04420.32
MR09-01 Leg2270.22330.43360.04420.32

Inoue, H. Y., H. Matsueda, M. Ishii, K. Fushimi, M. Hirota, I. Asanuma, and Y. Takasugi (1995), Long-term trend of the partial pressure of carbon dioxide (pCO2) in surface waters of the western North Pacific 1984 - 1993. Tellus 47B, 391 - 413.

CO2 Sensors:
Manufacturer: Rosemount Analytical
Model: BINOS 4.1
Resolution: -
Uncertainty: -

: MR03-K04 Leg5
: Processed (PI)
: JAMSTEC
: 二酸化炭素濃度, 気温, 気圧, 風向, 風速, 表面水温, 表面塩分
:
海洋 > 海洋化学 > 二酸化炭素

観測位置

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データリスト

  ファイル名
MR03-K04_leg5_pco2.zip
: MR03-K04 Leg5
: Processed (PI)
: JAMSTEC

pCO2 FORMAT_J

大気xCO2
  1. このデータセットは固定長、カンマ区切り(csv)です。
  2. データの欠損は、「-999」で表しています。
カラム番号 項目名 説明
1 Date 観測年月日(YYYY/MM/DD in UTC)
2 Time 観測時刻(時分秒)(HH:MM:SS in UTC)
3 Latitude 緯度(度)北緯は+、南緯は-マイナスで表記
4 Longitude 経度(度)東経で表記。例えば西経150度30分は、“209.500”
5 Atm_Tmp 気温(degree C)
6 Atm_Prs 気圧(hPa)
7 Wind_Dir 風向(度)
8 Wind_Spd 風速(m/s)
9 SST 表面水温(degree C)
10 SSS 表面塩分(PSU)
11 xCO2_Air 大気CO2濃度(ppmv)
海水xCO2
  1. このデータセットは固定長、カンマ区切り(csv)です。
  2. データの欠損は、「-999」で表しています。
カラム番号 項目名 説明
1 Date 観測年月日(YYYY/MM/DD in UTC)
2 Time 観測時刻(時分秒)(HH:MM:SS in UTC)
3 Latitude 緯度(度)北緯は+、南緯は-マイナスで表記
4 Longitude 経度(度)東経で表記。例えば西経150度30分は、“209.500”
5 Eq_Tmp 平衡器内の水温(degree C)
6 Eq_Prs 平衡器内の気圧(mmHg)
7 SST 表面水温(degree C)
8 Atm_Prs 気圧(hPa)
9 SSS 表面塩分(PSU)
10 xCO2_Sea 海水CO2濃度(ppmv)

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2017-04-11
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2012-12-25
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