kimpei ichiyanagi (kumamoto university/jamstec) kei yoshimura (scripps institution of oceanography,...

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  • Kimpei Ichiyanagi (Kumamoto University/JAMSTEC)Kei Yoshimura (Scripps Institution of Oceanography, UCSD/JAMSTEC)Manabu D. Yamanaka (JAMSTEC/Kobe University),Jun Matsumoto (Tokyo Metropolitan University/JAMSTEC)Stable isotopes in precipitation at DaNang, Vietnam

  • Isotopes in waterH216OH218O 18O ()HD16OD ()

    Isotope compositions of Hydrogen and OxygenHO1H 99.98416O 99.7632D 0.015617O0.0374 18O0.2039Delta-description for stable isotopes = (Rsample / Rreference ) 103 (Rsample : compositions of samples (D/H), (18O / 16O)Rreference : compositions of V-SMOWWhat is stable isotopes of water?

  • Isotopic fractionation in precipitation processesd-excessIndependent on precipitation Depend on evaporationheavylight

  • Global Network for Isotopes in Precipitation (GNIP)

  • JAMSTEC Network of Isotopes in Precipitation (daily, 3-hourly samplings)

  • Precipitation sampling

  • After Measure, pour the water into a glass bottle sampler and make it full.

    Daily Rainfall

    Site Name

    Serial #

    Site Name

    Date

    Rain (mm)

    In case of measure by hours, store the rain in another container for a day. Then, sample the daily rainwater.

    2

    1

    1

  • Figure 1. Monthly mean precipitation and 18O weighted by the daily precipitation amount (upper panel) at DaNang from February to December 2006. Same as 18O, but D and d-excess values (lower panel).heavylight

  • Figure 2. Daily variability in precipitation and 18O at DaNang from February to December 2006. heavyisotopeperiodlightisotopeperiod

  • Figure 6. Daily variability of water origin contributions to the total column water simulated by CMA (upper panel) and of 18O in precipitation simulated by ICM (lower panel) at DaNang for 2006. The IDO (red), SCS (yellow), PFO (blue), and LND (green) are the same color as Figure 5.Figure 5. Distribution of the water vapor origins. The monsoon Asia is divided into four regions: Indian Ocean (IDO), South China Sea (SCS), Pacific Ocean (PFO), and Land (LND). Different colors represent different origins.

  • Figure 3. Relationships between daily D and 18O in precipitation during whole period (left panel) and two periods (right panel). The results of river and lake water samples were also shown in the left panel.evaporationprecipitation

  • Figure 4. Relationships between daily precipitation amount and 18O values during whole period (left panel) and two periods (right panel).heavyisotopeperiodlightisotopeperiod

  • Concluding Remarks

    Stable isotopes in precipitation were observed at DaNang in Vietnam from February to December 2006. Depend on the seasonal variability of stable isotope ratios, it can be divided into light isotope period (April to September) and heavy isotope period (October to March). Daily variability of water origin contributions to the total column water and of 18O in precipitation at DaNang for 2006 were simulated by CMA and ICM, respectively. Simulated 18O in precipitation by the ICM can be reproduced the seasonal variability well. The water contributions from the SCS was corresponded to the heavy isotope period, while the IDO contribution was corresponded to the light isotope period. It was suggested the isotopic depletion from May to September was caused by the rain-out effect from the IDO to DaNang.

  • Thank you!

  • Figure 2. Daily variability of D and d-excess in precipitation at DaNang from February to December 2006.

  • Water & Isotope Budget Equation : Vertically accumulated Precipitable Water (W) = Wt-1 + QQ + EP Isotope ratio of W (w) = (w*W*pP ) / WRayleigh Equation : Isotope ratio of P (p) = (w* wf ) / ( 1f ) , Fractionation (f) = W / W*Isotope Circulation Model (by Yoshimura et al., 2003)

  • Graph1

    -160.66

    -83.42

    -88.26

    -85.11

    -78.41

    -57.23

    -9.97

    -32.55

    -47.31

    -81.27

    -6.52

    -39.09

    -19.92

    -22.1

    -37.13

    -47.3

    -25.52

    -18.32

    -41.11

    -24.23

    -19.8

    -5.71

    -20

    -4.5

    -29.66

    -45.55

    -8.49

    -15.56

    -59.22

    -5.17

    -31.06

    -45.74

    -12.09

    -33.59

    -26.11

    -34.94

    -4.6

    -9.75

    -37.14

    -14.09

    -9.47

    -9.92

    -25.74

    -23.06

    -22.01

    -15.17

    -17.17

    -11.55

    -20.51

    -28.75

    -15.77

    2.85

    -21.24

    -24.14

    -29.78

    -18.22

    -32.11

    -1.04

    -18.38

    -17.95

    -30.29

    10.4

    -20.25

    -7.17

    -31

    -2.67

    -46.14

    -13.8

    -17.87

    -5

    -20.18

    -6.07

    -33.67

    -7.24

    -12.07

    -10.04

    -73.64

    -19.06

    -7.07

    -11.13

    -45

    -34.88

    -7.91

    -57.7

    -8.16

    -11.48

    -26.43

    -13.52

    -28.93

    -17.97

    -44.81

    -50.06

    -25.24

    10.58

    -23.74

    -44.5

    -41.42

    -45.54

    -29.08

    -52.42

    -40.65

    -42.45

    -70.44

    -19.26

    -52.82

    -42.46

    -62.12

    -27.53

    -42.51

    -23.48

    -35.13

    -35.35

    -28.7

    -16.3

    -4.19

    -7.37

    -12.19

    -0.66

    -37.24

    2.02

    -20.11

    -40.75

    -32.56

    -33.75

    3.83

    -6

    -31.98

    -22.38

    -44.22

    -43.48

    -41

    -34

    -39.44

    -40.5

    -2.52

    -5.71

    -11.09

    -3.55

    -4.62

    -42.49

    -37.42

    12.6

    -28

    -53.54

    -11.93

    -33.97

    -38.29

    -16.71

    -31.56

    -51

    -27.46

    -32.85

    11.64

    -37.52

    -39.05

    -31.81

    -9.32

    -16.37

    -43.96

    -94.25

    -76.12

    -22.52

    -40.87

    -38.94

    -22.93

    -15.97

    -15.76

    -14.16

    -19.92

    -16.77

    -38.16

    -19.97

    -17.63

    -44.83

    -16.03

    -11.84

    -38.2

    -35.66

    -25.98

    -27.98

    -40.16

    -51.1

    -53.64

    -48.29

    -19.86

    -32.78

    -24.78

    -30.04

    -45.93

    -25.13

    -36.79

    -15.61

    -63.23

    -27.8

    -19.19

    -32.84

    -27.96

    -43.64

    -44.21

    -48.39

    -33.32

    -22.84

    -33

    -25.31

    -48.26

    -28.99

    -20.75

    -25.5

    -24.94

    -22.41

    -37.54

    -65.29

    -59.1

    -59.75

    -43.1

    -7.06

    -46.32

    -8.4

    -16.02

    -51.19

    -33.18

    -60.95

    -30.68

    -53.2

    -4.13

    -55.79

    -18.45

    -64.56

    -54.08

    -47.6

    -32.48

    -53.36

    -63.93

    -40.3

    -50.68

    -44.54

    -49.51

    -51.13

    -57.1

    -42.15

    -26.34

    -51.16

    -36.73

    -44.43

    -27.1

    -54.2

    -42.38

    -50.61

    -68.15

    -69.12

    -87.54

    -49.22

    -32.18

    -79.87

    -64.24

    -31.58

    -63.34

    -53.6

    -73.36

    -61.93

    -88.99

    -65.69

    -65.9

    -65.38

    -60.58

    -100.65

    -12.77

    -81.82

    -174.5

    -70.53

    -113.94

    -63.84

    -59.3

    -79.6

    -81.94

    -65.56

    -89.29

    -50.28

    -73.71

    -64.7

    -65.95

    -82

    -68.92

    -61.39

    -72.23

    -68.49

    -70.38

    -120.64

    -71.16

    -111.72

    -59.25

    -56

    -71.22

    -71.5

    -75.83

    -50.22

    -57.35

    -69.95

    -64.05

    -52.9

    -66.95

    -124.3

    -48.31

    -67.94

    -62.75

    -46.3

    -141.12

    -49.96

    -63.9

    -33.16

    -73.37

    -55.28

    -120.21

    -54.69

    -84.93

    -59.11

    -77.89

    -49.69

    -112.35

    -148.97

    -49.29

    -143.83

    -92.41

    -103

    -115.83

    -9.74

    -68.47

    -90.59

    -111.86

    -90.39

    -89.44

    -10.14

    -70.93

    -8.44

    -97.28

    -46.19

    -9.52

    -112.42

    -103.81

    -10.43

    -152.27

    -101.23

    -10.09

    -11.02

    -86.93

    -63.5

    -163.08

    -11.78

    -11.3

    -167.37

    -98.62

    -93.34

    -162.83

    -166.69

    -176.21

    -13.31

    -12.34

    -118.1

    -54.72

    -96.75

    -13.04

    -13.88

    -12.92

    -13.93

    -203.64

    -13.27

    -122.34

    -196.96

    -97.33

    -196.67

    -137.67

    -111.08

    -13.78

    -131.7

    -221.23

    -212.46

    -208.05

    -136.12

    -185.48

    -66.12

    -80.18

    -235.02

    -130

    -185.36

    -232.79

    Oxygen

    18O

    y = 8.0x + 10R2 = 0.99

    january

    All Data

    NoLatLonAltPrecVapprTempDeutriumOxygen

    890220014.5333.35273.9-4.3-105.67-13.64

    889520024.75295.73255.30.7-82.5-9.93

    890560027.88301.4491012-57-7

    879380035.22291.7210409.210.2-80.75-10.06

    859340037289.49374810.111-73.4-9.74

    939440037.45169.151511410.29.4

    888900038.3302.1351769.59.1-50.01-7.1

    879120139.47287.2820024815

    689940043.1237.87262278.47.1-30.1-4.98Deutrium

    938440043.58168.3221141213.9-47.19-6.86

    858640044.65287.933104713.1-75-9.8

    937800046.92172.12304811.815.6

    878280147.52294.95100209.621.9-5.17

    858010048.53287.07138412.714.4-21.98-5.03

    934170148.9175.17150

    949540049.32144.69903013.415.5-13.34-2.46

    689060049.65350.125420912.713.9-21.77-3.46

    875500051.53297.8456017.523.3-23.13-3.6

    857430051.54287.621143815.6-40-5.9Oxygen

    948680052.18144.97284813.920.7-21.32-4.28

    856820053.54286.9711816.1

    856720053.64287.74147920.6

    930110054.93173.28769117.319.2-19.54-3.56

    946750055.07138.58432113.522.5-27.9