JapanGEOTRACESNa/onalReport2017

HajimeObata

Scien/ficMee/ngs•  MarineGeochemistrysymposium(26–27March,Kochi)

GEOTRACES-Japanrelated19oralpresenta/ons

•  AnnualMee/ngofGSJ2017(13-15Sep,Tokyo)– GEOTRACESsession(K.Norisuye,K.Yamaoka,K.Horikawa,M.Inoue,J.Zhang,H.Obata)

•  16oraland6posterpresenta/ons

•  EastAsiaGEOTRACESWorkshop

Regional GEOTRACES:

New WESTPAC WG: A framework for cooperative studies in the Western Pacific Marginal Seas: Energy and materials exchange between land and open ocean

Members: Japan, China, Indonesia Malaysia, Philippines, Russia South Korea, Thailand

Treat the multi-marginal seas and the western boundary current as a unified system

1st workshop: Oct. 28, 2017, Fukuoka, Japan

PI: J. ZHANG, 2017-2020

KH-12-4

CL-6CL-7CL-8CL-9

CL-10

KodiakCL-15

CL-11

CL-14

CL-16

CL-18

KH-17-3

23June–07August,2017(PI:H.Obata)Tokyo–Kodiak–Vancouver

R/VHakuho-maru

KH-17-3

K2 Crossover Station with US 2018 cruise

OSP

Sediment Core

GP02

Cruises• TwoGEOTRACES-relatedHakuho-marucruiseswillbeappliedfor2019–2021.

1)GP18sec/oncruiseat155oE(PI:H.Obata)　2)processstudycruise(PI:J.Zhang)

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GEOTRACESprocessstudy:(proposalfor2019)- MaterialexchangesbetweenthemarginalseasandthesubtropicalwesternPacific,andtransportviatheKuroshio(PI:JingZHANG)- InterdisciplinarystudyonboundarymixingprocessesandmaterialtransportbetweenbasinsinthewesternPacificsubtropicalgyre.

Ship/meproposalforHakuho-Maru

-GEOTRACESstudies,-Basinexchanges,-Kuroshiotransport/changes-Nutrients/micronutrients-Atmosphericinput…-Ver/calmixingprocesses-Internalwaves-Westernboundarycurrent

Keyissues:

○● Clean Stn.○ Standard Stn.

Publica/ons(30in2016-2017)•  Nishioka,J.andH.Obata(2017):Dissolvedirondistribu/oninthewesternandcentralsubarc/c

Pacific-HNLCwaterforma/onandbiogeochemicalprocesses-.LimnologyandOceanography,DOI:10.1002/lno.10548.

•  Takano,S.M.Tanimizu,T.Hirata,K.-C.Shin,Y.Fukami,K.SuzukiandY.Sohrin(2017):Asimpleandrapidmethodforisotopicanalysisofnickel,copper,andzincinseawaterusingchela/ngextrac/onandanionexchange.Analy4caChimicaActa,967,1-11.

•  Zheng,L.T.Minami,S.Takano,H.Minami,Y.Sohrin(2017):Distribu/onandstoichiometryofAl,Mn,Fe,Co,Ni,Cu,Zn,Cd,andPbinseawateraroundtheJuandeFucaRidge.JournalofOceanography,73,1-17.

•  Obata,H.,J.Nishioka,T.Kim,K.Norisuye,S.Takeda,Y.Wakuta,T.Gamo(2017):DissolvedironandzincinSagamiBayandtheIzu-OgasawaraTrench.JournalofOceanography,73,333-344.

•  Nomura,T,A.Sakaguchi,P.Steier,R.Eigl,A.Yamakawa,T.Watanabe,K.Sasaki,T.Watanabe,R.Golser,Y.TakahashiandH.Yamano(2017):Reconstruc/onofthetemporaldistribu/onofU-236/U-238intheNorthwestPacificOceanusingacoralcoresamplefromtheKuroshioCurrentarea.MarineChemistry,190,28-34.

•  Kumamoto,Y.,M.Aoyama,Y.Hamajima,H.Nagai,T.Yamagata,Y.Kawai,E.Oka,A.Yamaguchi,K.Imai,A.Murata(2017):Fukushima-derivedradiocesiuminthewesternNorthPacificin2014.JournalofRadioanaly4calandNuclearChemistry,311,1209-1217.

•  Hain,K.,T.Faestermann,L.Fimiani,L.Golser,J.Gómez-Guzmán,G.Korschinek,F.Kortmann,C.L.vonGostomski,P.Ludwig,P.Steier,H.TazoeandM.Yamada(2017):Plutoniumisotopes(239–241Pu)dissolvedinPacificOceanwatersdetectedbyacceleratormassspectrometry:NoeffectsoftheFukushimaAccidentobserved.EnvironmentalScienceandTechnology,51,2031-2037.

WSGCNP AG

ASOKTZ

Nishioka and Obata, L. O. (2017)

AGWSG

Asub-polarmarginalseacontrolsoceanicironcyclesintheNorthPacific

WSG has two times higher

Fe/N ratio than AG

Simultaneous analysis of Ni, Cu and Zn isotopes in seawater

Takano et al., ACA (2017)

Vertical profiles of δ60Ni, δ65Cu, and δ66Zn at GR15 station (30.00°S, 170.00°W) in the subtropical South Pacific

GP19 KH-14-6

Funding•  GEOTRACESJapan(Grant-in-AidforSci.Res.A,overseasacademic

research,JapanSocietyforthePromo/onofScience)–  PI:ToshiGamo–  Total¥33.3M(From2016to2020)–  ForGEOTRACESstudiesandtravelfeesetc.

•  OceanMixingProcesses:ImpactonBiogeochemistry,ClimateandEcosystem(OMIX)(Grant-in-AidforSci.Res.inInnova/veAreas)–  PI:IchiroYasuda,–  J.Nishioka&H.Obata¥73M(From2015to2019)–  J.Zhang¥10M(From2015to2019)

180oE�140oE� 150oE� 160oE�

TR-16 � K2

CL-1

170oE�

TR-15 �

GEOTRACESsecLoncruiseGP18(proposalfor2020)- TEIstransportedfromthemarginalseastothewesternPacific.- (PI:HajimeObata)- Transportprocessintheintermediatelayers(e.g.,NorthPacificIntermediateWater)- Transportprocessinsurfacelayers(e.g.,Oyashiocurrent,Kuroshiocurrent)

Cruises– KH-17-3:sec/onGP02

•  23Jun.–9Aug.2017(PI:H.Obata)

KH-12-4

KH-11-7

KH-14-6

R/VHakuho-maru

KH-15-3

KH-17-3