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)

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.

Resources

Name Format Description Link
0 Navigate directly to the URL for a descriptive web page. https://www.ncei.noaa.gov/archive/accession/download/311540
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Navigate directly to the URL for a descriptive web page with download links. https://doi.org/10.25921/4apq-vg02
0 Navigate directly to the URL for a descriptive web page. https://www.ncei.noaa.gov/archive/accession/oas/311540
0 Users may contact NCEI for more information and to request access to the archived data. User requests must be approved by NCEI and are subject to order fulfillment constraints. https://www.ncei.noaa.gov/contact
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
21 User guide https://www.jma.go.jp/jma/en/Activities/cc.html

Tags

  • nitrite-nitrogen
  • rd25-01 cruise
  • ctd salinity std. in pss-78
  • east mariana basin
  • ctd depth of sampling in meters
  • r/v ryofu maru
  • surface salinity
  • oceanography
  • surface temperature in its-90
  • ctd depth of std. in meters
  • inorganic phosphate-phosphorus
  • multi-niskin bottle sampler
  • ctd salinity in pss-78
  • water depth to the bottom
  • l1ycg5
  • northwest pacific ocean
  • ctd temperature std. in its-90
  • geopotential anomaly
  • thermosteric anomaly
  • dissolved oxygen std.
  • ctd
  • ctd temperature in its-90
  • depth of the reference layer
  • (nitrate+nitrite)-nitrogen
  • hydrogen-ion

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