Hakuho Maru KH15-03 (GP06)

Cruise summary report

Cruise Info. 
Ship name (ship code)Hakuho Maru (49HH)
Cruise identifierKH15-03 (GP06)
Cruise period2015-10-14 — 2015-11-02
Port of departureTokyo, Japan
Port of returnNagasaki, Japan
ObjectivesGEOTRACES section cruise.


1. To understand the spatial distribution of trace elements and their isotopes in the vertical profiles in the East China Sea and Kuroshio water
2. To examine the distribution of trace metal concentrations and their speciation relating to biological activity and to elucidate their controlling mechanisms in the East China Sea and surrounding seas
3. To clarify high resolution analysis of the structure of water masses and oceanic circulation using multiple chemical tracers, such as trace elements and their isotopes
4. To study the dynamics of nutrients and trace metals, and evaluate their relationship between distribution and plankton variation
5. To examine the plankton community composition and trace elements in the suspended particles, and to reveal the spatial and temporal distributions of nutrients which support primary production in the East China Sea
6. To estimate primary production using chlorophyll a by satellite and field observation, to clarify the correlation between nutrient variation and primary production
7. To evaluate boundary mixing and its contribution to the material transport in the marginal sea and slope area through measurements of microstructure
8. To analyze stable and radioactive trace elements in the sediments to understand the temporal variations in the influence of terrestrial materials to the area around the Kuroshio in the past 6000 years
Chief scientistJing Zhang (University of Toyama, Graduate School of Science and Engineering)
ProjectGEOTRACES -Trace elements and their isotopes in the water column
Cruise reportHakuho Maru KH15-03 (GP06) cruise report hakuhomaru_kh15-03.pdf (11.27 MB) 
Ocean/sea areas 
GeneralEastern China Sea (Tung Hai)
SpecificEast China Sea and Kuroshio water
Track chartsHakuho Maru KH15-03 (GP06) cruise track — hakuhomaru_kh15-03trk.pdf (0.14 MB) 
Data held at BODC 
Discrete samples 
55  CTD frame plus rosette sampler