Generally, the air-sea momentum, heat, and CO2 gas flux are calculated in field observation using the eddy correlation method, which simultaneously measures the horizontal and vertical wind components. Measuring the components of wind velocity is usually limited to fixed installations owing to the minor effect of the platform on the wind flow. Occasionally, numerical simulations are sometimes used for shipboard observations. However, the details of the effect of the wind flow around an observation ship are scarcely investigated using numerical simulations, although ships affect the wind flow and wind direction by wind distortion. In this study, we investigated the effect of ships on the wind flow around the Hakuho–Maru of the Japan Agency for Marine-Earth Science and Technology using a numerical simulation. As a result of the flow visualization, measuring the horizontal and vertical components of wind velocity was very difficult because the wind distortion (upward and downward gusts, among others) was very large owing to the effect of the ship. This showed that the effect of the ship was significant for the measurements of air-sea momentum, heat, and CO2 gas flux.
Spatiotemporal variations of warm and saline water around Iki Island in the Tsushima Straits from October 2016 to March 2017 were described using the CTD data by fisherman and the non-assimilated coastal ocean numerical model. The band of saline water flowed not only mainly through the center of the eastern channel in the Tsushima Straits but also intermittently through the Iki channel. Consequently, although the salinity was increasing in the Tsushima Straits toward the winter, the salinity increasing in the Iki channel lagged behind surrounding water. When the many observational data by fisherman are assimilated in the coastal ocean numerical model, it is desirable that the short spatiotemporal variations of ocean front associated with like the saline band can be reproduced and forecasted.
JAMSTEC has participated in the Tohoku Ecosystem-Associated Marine Sciences project (TEAMS) which scientifically clarifies the impact and recovery process of the Great East Japan Earthquake on marine ecosystems in the Tohoku region and supports the rehabilitation of fisheries and industries. JAMSTEC develops and operates systems for managing and publishing data and information obtained from observations of TEAMS. One of them is the system for collecting and archiving obtained information of biological observation at the field observation. This system enables to archives and edits marine biological observation information in Web application by collecting marine biological observation information such as photos and related information and uploading it using mobile application.
Autonomous profiling buoy system was developed for continuous monitoring for the ice-covered oceans. This profiling buoy is tethered to a fixed floating point to collect time series of vertical profiles by controlling its buoyancy. The profiling buoy is equipped with satellite data transmitter together with oceanographic sensors, so that it can send the observed data near real-time basis at the timing of surfacing. Field experiments of this profiling buoy system were conducted at about 400-m deep region in the Okhotsk Sea for a month from July to August 2014 and for six months from November 2014 to May 2015. Designed functions including measurement, data transmission, and ice-avoiding protocol were successful. At the same time, problems such as limited ascent for the high-speed current were revealed for future improvements.