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Results of Oceanographic Observations in Areas under National Jurisdiction of the Commonwealth of the Northern Mariana Islands taken by CTD and ADCP from the R/V Ryofu Maru, cruise RD25-01, on 2025-03-15 (NCEI Accession 0311540)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 03, 2026 at 05:16 AM | Dataset Last Updated: February 26, 2026 at 12:00 AM
RD25-01 cruise was conducted by the Japan Meteorological Agency's research vessel "Ryofu Maru" from February to March, 2025. This dataset reports the results of marine observations conducted within the exclusive economic zone (EEZ) of the Commonwealth of the Northern Mariana Islands during this voyage. The major objectives of the cruise are to monitor ocean conditions in the western North Pacific on a seasonal basis. During the cruise, vertical profiles of seawater temperature, salinity, dissolved oxygen, nutrients and currents were observed. As a method of Hydrographic observation, vertical distributions of seawater temperature and salinity were measured using a CTD (Conductivity-Temperature-Depth profiler), and chemical analysis was performed on seawater samples collected by the CTD's multi-bottle sampler. Additionally, ocean current observations were conducted using an Acoustic Doppler Current Profiler (ADCP), which emitted ultrasonic waves from the ship's bottom to measure surface currents down to depths of several hundred meters. This dataset is the U.S. State Department MSR RATS U2024-018. Data are in CSV and TXT formats.

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0311540 CURRENT DIRECTION CURRENT SPEED DISSOLVED OXYGEN NITRATE NITRITE phosphate SALINITY

Complete Metadata
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describedByType application/octet-steam
description RD25-01 cruise was conducted by the Japan Meteorological Agency's research vessel "Ryofu Maru" from February to March, 2025. This dataset reports the results of marine observations conducted within the exclusive economic zone (EEZ) of the Commonwealth of the Northern Mariana Islands during this voyage. The major objectives of the cruise are to monitor ocean conditions in the western North Pacific on a seasonal basis. During the cruise, vertical profiles of seawater temperature, salinity, dissolved oxygen, nutrients and currents were observed. As a method of Hydrographic observation, vertical distributions of seawater temperature and salinity were measured using a CTD (Conductivity-Temperature-Depth profiler), and chemical analysis was performed on seawater samples collected by the CTD's multi-bottle sampler. Additionally, ocean current observations were conducted using an Acoustic Doppler Current Profiler (ADCP), which emitted ultrasonic waves from the ship's bottom to measure surface currents down to depths of several hundred meters. This dataset is the U.S. State Department MSR RATS U2024-018. Data are in CSV and TXT formats.
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identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/0311540.xml
issued 2026-01-13T00:00:00.000+00:00
keyword 
[
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  "CURRENT DIRECTION",
  "CURRENT SPEED",
  "DISSOLVED OXYGEN",
  "NITRATE",
  "NITRITE",
  "phosphate",
  "SALINITY",
  "silicate",
  "WATER TEMPERATURE",
  "ADCP",
  "CTD",
  "Niskin bottle",
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  "profile",
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  "Japan Meteorological Agency",
  "Japan Meteorological Agency",
  "U. S. Department of State Marine Scientific Research (MSR)",
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  "oceanography",
  "JP/JMA > Japan Meteorological Agency, Japan",
  "MSR > U.S. Department of State Marine Scientific Research",
  "RD25-01 Cruise",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE",
  "EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS",
  "EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE",
  "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY",
  "(Nitrate+nitrite)-nitrogen",
  "CTD depth of STD. in meters",
  "CTD depth of sampling in meters",
  "CTD salinity STD. in PSS-78",
  "CTD salinity in PSS-78",
  "CTD temperature STD. in ITS-90",
  "CTD temperature in ITS-90",
  "Depth of the reference layer",
  "Dissolved oxygen STD.",
  "Geopotential anomaly",
  "Hydrogen-ion",
  "Inorganic phosphate-phosphorus",
  "Nitrite-nitrogen",
  "Surface salinity",
  "Surface temperature in ITS-90",
  "Thermosteric anomaly",
  "Water depth to the bottom",
  "ADCP > Acoustic Doppler Current Profiler",
  "CTD > Conductivity, Temperature, Depth",
  "NISKIN BOTTLES",
  "CTD,Multi-Niskin bottle sampler",
  "Ships",
  "RYOFU MARU (call sign: 7KPB, ICES code: 494W, 2024-)",
  "R/V Ryofu Maru",
  "OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN",
  "Northwest Pacific Ocean,East Mariana Basin",
  "L1YCG5"
]
landingPage https://www.ncei.noaa.gov/contact
language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2026-02-26T00:00:00.000+00:00
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[
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rights otherRestrictions
spatial 149.33333,16.0,149.31666,16.0
temporal 2025-03-15T00:00:00+00:00/2025-03-15T00:00:00+00:00
theme 
[
  "geospatial"
]
title Results of Oceanographic Observations in Areas under National Jurisdiction of the Commonwealth of the Northern Mariana Islands taken by CTD and ADCP from the R/V Ryofu Maru, cruise RD25-01, on 2025-03-15 (NCEI Accession 0311540)

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