Fig. 5 showed the ratio of DON:DOP in the TS. Different slopes and their corresponding locations...
1
Fig. 5 showed the ratio of DON:DOP in the TS. Di fferent slopes and their corresponding locations were marked with the same color. The average ratio of DOC:DON:DOP was about 330:46:1. The hig hest ratio was observed around the Minjiang plum e. 0.0 0 0 .05 0.10 0.15 0.2 0 0.25 0.30 0.3 5 0.4 0 0.45 0 .50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 R ed fie ld ratio 1 6 u p p er lim it 50 D O N ( M ) D O P ( M ) station s n ear P .R.C. R=0.9010 P=0.0056 other stations R =0.7835 P=0.0043 station s n ear T aiw an 0.0 0 0 .05 0.10 0.15 0.2 0 0.25 0.30 0.3 5 0.4 0 0.45 0 .50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.00 0 .05 0 .10 0.15 0 .20 0.25 0.30 0.3 5 0.4 0 0.45 0.50 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 R ed fie ld ratio 1 6 u p p er lim it 50 D O N ( M ) D O P ( M ) station s n ear P .R.C. R=0.9010 P=0.0056 other stations R =0.7835 P=0.0043 station s n ear T aiw an Backgroun d Results and Discussion Conclusi ons ● Distributions of DOM and CDOM in TS are controlled mainly by local freshwater input and water mixing from the CDW, SCS Water and KW. ● As the unique characteristics and conservative behavior of terrestrial humic-like CDOM (Ft) in each s ource water, the Ft can be used as an optical tracer for the mixing of source waters (Changjiaug Dilu te Water, Minjiang Water, South China Sea Water and Kuroshio Water) in TS. ● Both nutrients and DOM were dominated by terrestrial inputs in TS, as significant correlations were f 105 100 65 90 95 100 80 D O C ( M ) M in jiang (a ) D O N ( M ) M in jiang (b ) Fig. 4. The contours of DOC (a), and DON (b) in TS. The concentration was slightly higher in the China coast than in the Taiwan coast, and the highest concentration was always found in the Minjiang plume, revealing a significant impact of river discharge. Fig. 6. The distributions of a CDOM (355), spectral slope coefficient (S) ,and terrestrial humic-like CDOM (Ft) in TS. a (3 5 5 ) ( m ) -1 C D O M M in j ia n g 0.01 9 0.01 9 Spectra slo pe co efficient ( nm ) -1 0 .019 M injian g T e r r e s tr ia l h u m ic -lik e C D O M ( F l. U . ) M in j ia n g Fig. 7. The fluorescence intensity of terrestrial humic-like CDOM correlated inversely with salinity in TS. This may indicate that the terrestrial humic- like CDOM can be used as an optical tracer for the mixing of source waters (Changjiaug Dilute Water, Minjiang Water, South China Sea Water and Kuroshio Water) in TS. 0 1 2 3 4 5 6 7 0 2 4 6 8 R = 0 .7 93 8 , P <0.0001 D IN ( M ) T erre strialhu m ic-like C D O M ( F l.U .) Fig. 8. The correlation is significant between D IN and terrestrial humic-like CDOM suggesting that both nutrients and terrestrial humic- like CDOM came mainly from river input. 0 1 2 3 4 5 6 7 0 1 2 3 4 5 R =0.9352 P <0.0001 M arine H um ic-lik e C D O M ( F l. U . ) T e rre stria lH um ic-like C D O M (Fl.U .) Fig. 9. A significant correlation between marine and terrestrial humic- like CDOM implied that terrestrial input nutrient supported biological production and provid ed the source of marine-like CDOM. Fig. 1. The sampling lo cations in the studied area. Station 19A repr esented Changjiaug pl ume water, Station F represented SCS wate r, and Station S5 represented KW. The Taiwan Strait (TS) is a marginal sea of interest as it receives freshwater from both Taiwan Island and mainland China and it also connects water transports between East China Sea (ECS), South China Sea (SCS) and Kuroshio Water (KW). During the early summer season, northern SCS Water influenc ed by Kuroshio intrusion flows northward through the TS, mixing with local river plumes and/or ECS W aters. We attempt to study the geochemical characteristics of DOM and CDOM along with hydrological properties in the TS to understand the controls of DOM and CDOM distributions in the TS. S a lin ity (p su ) 3 4 .2 Fig. 3. The distributions of salinity in TS. DISTRIBUTIONS AND CHARACTERISTICS OF TOTAL AND COLORED DISSOLVED ORGANIC MATTER IN THE TAIWAN STRAIT Wan-Tzu Lu , Jia-Jang Hung Institute of Marine Geology and Chemistry, National Sun Yat-San University, Kaohsiung, Taiwan, ROC Fig. 2. The temperature–salinity plots in the TS. Two major water types can be identified: one was Kuroshio influenced SCS water, a nd the other was freshwater domi nated coastal water.
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Transcript of Fig. 5 showed the ratio of DON:DOP in the TS. Different slopes and their corresponding locations...
Fig. 5 showed the ratio of DON:DOP in the TS. Different slopes and their corresponding locations were marked with the same color. The average ratio of DOC:DON:DOP was about 330:46:1. The highest ratio was observed around the Minjiang plume.
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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Redfield ratio 16
upper limit 50
DO
N (
M )
DOP ( M )
stations near P.R.C.
R=0.9010 P=0.0056
other stations
R=0.7835 P=0.0043
stations near Taiwan
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500
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Redfield ratio 16
upper limit 50
DO
N (
M )
DOP ( M )
stations near P.R.C.
R=0.9010 P=0.0056
other stations
R=0.7835 P=0.0043
stations near Taiwan
Background
Results and Discussion
Conclusions
●Distributions of DOM and CDOM in TS are controlled mainly by local freshwater input and water mixing from the CDW, SCS Water and KW. ●As the unique characteristics and conservative behavior of terrestrial humic-like CDOM (Ft) in each source water, the Ft can be used as an optical trac
er for the mixing of source waters (Changjiaug Dilute Water, Minjiang Water, South China Sea Water and Kuroshio Water) in TS. ● Both nutrients and DOM were dominated by terrestrial inputs in TS, as significant correlations were found between DIN and Ft and between marine-li
ke CDOM and Ft.
105
100
65
9 0
9 51 0 0
8 0
D O C ( M )
M in jian g(a)
D O N ( M )
M in jia n g(b)
Fig. 4. The contours of DOC (a), and DON (b) in TS. The concentration was slightly higher in the China coast than in the Taiwan coast, and the highest concentration was always found in the Minjiang plume, revealing a significant impact of river discharge.
Fig. 6. The distributions of aCDOM(355), spectral slope coefficient (S) ,and terrestrial humic-like CDOM (Ft) in TS.
a (3 5 5 ) ( m )-1C D O M
M in jia n g
0 .0 1 90 .0 1 9
S p ectra s lo p e co effic ien t ( n m )-1
0 .0 1 9
M in jian g
T errestr ia l h u m ic-lik e C D O M( F l. U . )
M in jia n g
Fig. 7. The fluorescence intensity of terrestrial humic-like CDOM correlated inversely with salinity in TS. This may indicate that the terrestrial humic-like CDOM can be used as an optical tracer for the mixing of source waters (Changjiaug Dilute Water, Minjiang Water, South China Sea
Water and Kuroshio Water) in TS.
0 1 2 3 4 5 6 7
0
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R=0.7938, P<0.0001
DIN
(
M )
Terrestrial humic-like CDOM ( Fl. U. )
Fig. 8. The correlation is significant between DIN and terrestrial humic-like CDOM suggesting that both nutrients and terrestrial humic-like CDOM came mainly from river input.
0 1 2 3 4 5 6 70
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R=0.9352 P<0.0001
Ma
rin
e H
um
ic-l
ike
CD
OM
( F
l. U
. )
Terrestrial Humic-like CDOM (Fl.U.)
Fig. 9. A significant correlation between marine and terrestrial humic-like CDOM implied that terrestrial input nutrient supported biological production and provided the source of marine-like CDOM.
Fig. 1. The sampling locations in the studied area. Station 19A represented Changjiaug plume water, Station F represented SCS water, and Station S5 represented KW.
The Taiwan Strait (TS) is a marginal sea of interest as it receives freshwater from both Taiwan Island and mainland China and it also connects water transports between East China Sea (ECS), South China Sea (SCS) and Kuroshio Water (KW). During the early summer season, northern SCS Water influenced by Kuroshio intrusion flows northward through the TS, mixing with local river plumes and/or ECS Waters. We attempt to study the geochemical characteristics of DOM and CDOM along with hydrological properties in the TS to understand the controls of DOM and CDOM distributions in the TS.
S a lin ity (p su )
3 4 .2
Fig. 3. The distributions of salinity in TS.
DISTRIBUTIONS AND CHARACTERISTICS OF TOTAL AND COLORED DISSOLVED ORGANIC MATTER IN THE TAIWAN STRAIT
Wan-Tzu Lu, Jia-Jang Hung
Institute of Marine Geology and Chemistry, National Sun Yat-San University, Kaohsiung, Taiwan, ROC
Fig. 2. The temperature–salinity plots in the TS. Two major water types can be identified: one was Kuroshio influenced SCS water, and the other was freshwater dominated coastal water.
