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Project VERTIGO--Northwest Pacific. Kamchatka peninsula. Sea of Okhotsk. Bering Sea. Oyashio current. SEEDS. KNOT. Kuroshio current. Major Asian dust storms pass over the Northwest Pacific (April 2001). x K2. … though some years less than others (April 2005). x K2. - PowerPoint PPT Presentation
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Project VERTIGO--Northwest Pacific
• KNOT
• SEEDS
Bering SeaSea of Okhotsk
Kuroshio current
Oyashio current
Kamchatka peninsula
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Major Asian dust storms pass over the Northwest Pacific (April 2001)
x K2
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… though some years less than others (April 2005)
x K2
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… though some years less than others (May 2005)
x K2
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… though some years less than others (June 2005)
x K2
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… and not when we were there (July 2005)
x K2
Sat
ellit
e ch
loro
phyl
l Apr
il-S
ept 2
005
April May June
July Aug Sept
Stn K2-July 2005
0
50
100
150
200
250
300
350
400
450
500
0.0 1.0 2.0 3.0 4.0[Fe] (nM)
Dep
th (
m)
MULVFS7-ICPMSpFe (1-53um)MULVFS7-XRFhotspotsMULVFS7-XRF>DLMULVFS9-XRFhotspotsMULVFS9-XRF>DL
Stn K2-July 2005
0
50
100
150
200
250
300
350
400
450
500
0 200 400 600[Mn] (pM)
Dep
th (
m)
MULVFS7-ICPMSMn (1-53um)MULVFS7-XRF MnhotsMULVFS7-XRFMnDLMULVFS9-XRF MnhotsMULVFS9-XRFMnDL
MULVFS#9
Stn K2- Particulate Fe
Stn K2- 228Ra
Stn K2- Particulate Mn
Peak in 228Ra and particulate Mn, Fe at 135m
Stn K2- Density
Mn and 228Ra are both shelf tracers Fe from the shelf too? Which shelf?
Data from Matt Charette
Data from Jim Bishop and Phoebe Lam
Data from Jim Bishop and Phoebe Lam
CTD data from cruise
Tying Okhotsk to K2 to Kamchatka shelves
x K2
K2
The 26.661-26.761 density layer intersects with both the Okhotsk shelf (left) and Kamchatka shelf (right), though Kamchatka waters have less far to go (Okhotsk needs to recirculate)
x
K1-K2-K3 Radium
van Beek P., François R., Honjo S., Reyss J.-L., Honda M., Charette M.
JPAC project; Mirai cruise 2002; in prep.
Subsurface Ra-228K1 < Ra-228K2< Ra-228K3
Argues against Kamchatka shelf as source
Where is K3 getting its Ra, and is it feeding K2?
K1-K3 sigtheta
mirai cruise
x
x
K3 from Kuroshio
mirai cruise
x
Project VERTIGO--Northwest Pacific• Cruise to “K2” in
July-Aug 2005
• KNOT
• SEEDS
Stn K2-July 2005
0
50
100
150
200
250
300
350
400
450
500
0.0 1.0 2.0 3.0 4.0
[Fe] (nM)
Dep
th (
m)
MULVFS7-ICPMSpFe (1-53um)
MULVFS7-XRFhotspots
MULVFS7-XRF>DL
MULVFS9-XRFhotspots
MULVFS9-XRF>DL
Station KNOT--May 2000 (Nishioka et al. 03)
0
50
100
150
200
250
300
350
400
450
500
0.0 0.5 1.0 1.5 2.0 2.5
[Fe] (nM)
Depth
(m
)
Labile pFeTotal FeDissolved FeSoluble FeColloidal Fe
Stn K2- MULVFS Fe
Stn KNOT-Nishioka et al. 03
?
