GEOTRACES Japan Cruise Status

maintained by Japan Oceanographic Data Center.                       last updated on  31 Oct. 2017

Ship Name

R/V Hakuho-Maru

Responsible Organization

Atmosphere and Ocean Research Institute, University of Tokyo (AORI, UT)

Address: 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan

Cruise No.

KH-12-04

Cruise Status

Done

Departure

23 August 2012

Arrival

3 October 2012

Research Area

North Pacific Ocean

Objectives

 A zonal transect was undertaken along ~47N in the northern Pacific to investigate biogeochemical cycles of trace elements and isotopes (TEIs) as part of the international GEOTRACES program. The Japanese research vessel Hakuho Maru left Tokyo on August 23, 2012, and arrived at Vancouver (Canada) on October 3, 2012. A port call at Dutch Harbor (USA) was taken between 13 and 17 September during the cruise. Thirty three scientists and students, including two graduate students from Korea and Indonesia, participated the cruise. Although we aimed at establishing the 2-dimensional profiles of GEOTRACES TEIs fully along the GP-02 line in the northern North Pacific, most of the stations in the eastern half of the line were not occupied due to bad weather conditions (We have a cruise plan to cover the eastern half in 2017). We will extract much information on biogeochemical cycles of TEIs and their roles in marine ecosystems in the western half of the GP-02 line. We will obtain some radioisotope data associated with the accident at Fukushima nuclear power plant on March 11, 2011. In addition, we focused on hydrothermal plumes from Juan de Fuca Ridge to study trace metal fluxes from lithosphere to seawater. In order to pursue the above purposes, seawater samples were taken from surface to bottom by clean CTD hydrocasts (12L Niskin-X bottles) using a Ti-armored cable and a large volume (250L) water sampling system. Bottom sediments were also sampled by using a multiple corer. Measurements of chemical constituents and isotopes are on progress in clean rooms on board the ship and/or in shore-based laboratories.

Principle Investigator

T.Gamo (AORI, UT)

Related Project

GEOTRACES

Cruise Type

GEOTRACES transection cruise (GP02)

Chief Scientist for GEOTRACES

Toshitaka Gamo (Dr.)

Atmosphere and Ocean Research Institute, University of Tokyo (AORI, UT)

Address: 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan

E-mail: gamo (a) aori.u-tokyo.ac.jp

Cruise Metadata

First Submission: done

Update:

Report

Cruise Summary Report: yes

Cruise Report: Preliminary report(52.7MB)

Observation Items

Item/Parameters

Number

Responsible Scientist

Data Submission

JODC Ref.No

Routine Data

 

 T. Gamo

Mar2016

 20170097

Trace elements:

Fe

 

 J. Nishioka

Mar2016

 20170097

Trace elements:

Al, Mn, Cd, Cu, Pb

 

 Y. Sohrin

Mar2016

 20170097

Trace elements:

Zn

 

 H. Obata

Mar2016/Feb2017

 20170097

Radioactive isotopes:

230Th, 231 Pa

 

A. Okubo

 

 

Stable isotopes: 15N

 

J. Zhang

 

 

Stable isotopes: 13C

 

Y. Kumamoto

Mar2016

20170097

Stable isotopes: 30Si

 

Gregory de Souza

 

 

Radiogenic isotopes:

Nd

 

H.Tazoe

 

 

Radiogenic isotopes:

Pb

 

K.Norisuye

 

 

Others: Se

 

Y. Nakaguchi

 

 

Others: Cr

 

K. Isshiki

 

 

Others: Be-7, Be-10

 

H. Nagai

 

 

Others: He-3/He-4

 

Y. Sano

 

 

Others:PFOA, PFOS

 

N. Yamashita

 

 

Others:14C

 

Y. Kumamoto

 

 

Cruise Track

 

Note