Cruise inventory

Hakuho Maru KH12-4 (GP02)

Cruise summary report

Cruise Info. 
Ship name (ship code)Hakuho Maru (49HH)
Cruise identifierKH12-4 (GP02)
Cruise period2012-08-23 — 2012-10-03
Port of departureTokyo, Japan
Port of returnVancouver, Canada
ObjectivesA zonal transect will be undertaken along ~47°N in the northern Pacific to investigate biogeochemical cycles of trace elements and isotopes as part of the international GEOTRACES program. The Japanese research vessel Hakuho Maru will leave Tokyo on August 23, 2012, and arrive at Vancouver (Canada) on October 3, 2012. A port call at Dutch Harbor (USA) is planned between 13 and 16 September. Thirty three scientists and students, including two graduate students from Korea and Indonesia, will participate the cruise. We aim at establishing the first 2-dimensional profiles of GEOTRACES TEIs in the northern North Pacific to extract much information on biogeochemical cycles of TEIs and their roles in marine ecosystems. Some radioisotopes are associated with the accident at Fukushima nuclear power plant on March 11, 2011. In addition, submarine hydrothermal activity at Juan de Fuca Ridge is an important target as a significant source of trace metals from lithosphere to seawater. In order to pursue the above purposes, seawater samples will be 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 will also be sampled by using a multiple corer. Measurements of chemical constituents and isotopes will be performed in clean rooms on board the ship and/or in shore-based laboratories.
Chief scientistToshitaka Gamo (University of Tokyo, Atmosphere and Ocean Research Institute)
ProjectGEOTRACES -Trace elements and their isotopes in the water column
Cruise reportHakuho Maru KH12-4 (GP02) cruise report hakuhomaru_kh12.pdf — access key 'C' (52.79 MB) 
Ocean/sea areas 
GeneralNorth Pacific Ocean
SpecificEast-west section cruise (GP02) along 47°N in the northern Pacific.
Data held at BODC 
Discrete samples 
61  Dissolved metal concentrations in the water column
Stable isotope enrichment in the water column
Total metal concentrations in water bodies
Chlorophyll pigment concentrations in water bodies
Silicate concentration parameters in the water column
Vertical spatial coordinates
Alkalinity, acidity and pH of the water column
Salinity of the water column
Nitrate concentration parameters in the water column
Total dissolved inorganic carbon (TCO2) concentration in the water column
Temperature of the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Dissolved oxygen parameters in the water column