project vertigo--northwest pacific knot seeds bering sea sea of okhotsk kuroshio current oyashio...

Project VERTIGO--Northwest Pacific

• KNOT

• SEEDS

Bering SeaSea of Okhotsk

Kuroshio current

Oyashio current

Kamchatka peninsula

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are needed to see this picture.

Major Asian dust storms pass over the Northwest Pacific (April 2001)

x K2

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are needed to see this picture.

… though some years less than others (April 2005)

x K2

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are needed to see this picture.

… though some years less than others (May 2005)

x K2

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are needed to see this picture.

… though some years less than others (June 2005)

x K2

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are needed to see this picture.

… and not when we were there (July 2005)

x K2

Sat

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e ch

loro

phyl

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005

April May June

July Aug Sept

Stn K2-July 2005

0

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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

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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

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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

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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

?