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Hasumi Lab
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The lab uses numerical models to reproduce the ocean's large-scale currents and explore how the climate system comes about.
AboutAbout the lab
Understanding climate through the ocean's general circulation
The Hasumi Lab studies the large-scale currents that circulate through the world's oceans and the mechanisms of climate that operate through them.
The ocean can store more than a thousand times as much heat as the atmosphere, so it is essential for understanding climate, which changes slowly and on a large scale.
The interior of the ocean is difficult to observe, and many phenomena there are still not understood.
The lab develops its own numerical models of the ocean and climate, and investigates ocean currents by reproducing them on computers.
Key terms
- Thermohaline circulation
- A large-scale flow that circulates around the globe, reaching into the deep ocean, driven by differences in seawater density caused by temperature and salinity
- Deep water
- Cold, dense seawater found deep in the ocean. It forms when surface water in the polar oceans cools and sinks
- Numerical model
- A computer program that expresses changes in flow and temperature with mathematical equations and reproduces them on a computer
ResearchResearch themes
While developing numerical models of the ocean and climate, the lab investigates ocean circulation across a range of time and spatial scales, and uses this to study climate. The lab accommodates a wide range of topics as long as the research is centered on numerical modeling of ocean circulation.
*Illustrative imageGlobal Thermohaline Circulation
Thermohaline circulation is determined by many mechanisms, including the exchange of heat and water at the sea surface, the formation of deep water, and mixing by eddies and turbulence. The lab approaches it from many angles, aiming to clarify its actual state and how it comes about.
*Illustrative imagePolar Oceans and Climate
The polar oceans are changing especially greatly under global warming, and they are also where deep water, the starting point of thermohaline circulation, forms. Using modeling closely coordinated with observations, the lab investigates the role the polar oceans play in ocean circulation and climate.
*Illustrative imageCoastal Seas, Continental Shelves, and the Global Ocean
Freshwater and materials flowing from rivers into the ocean are important for the ocean's general circulation and material cycles. The lab studies mechanisms specific to coastal areas and continental shelves, as well as the exchange of seawater with the open ocean, in order to understand the whole picture of global ocean circulation.
*Illustrative imageThe Kuroshio and North Pacific Climate
The Kuroshio is known as a strongly variable current and affects the climate of the entire North Pacific. The lab studies the role that North Pacific currents, including the Kuroshio, and their variability play in climate change and in the ocean's material cycles.
MembersFaculty
- ProfessorHiroyasu HasumiPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images.
- Top image: “Perpetual Ocean - Gulf Stream ( )” NASA Goddard Space Flight Center from Greenbelt, MD, USA / Public domain (cropped)
- Global Thermohaline Circulation: “Perpetual Ocean 2- Western Boundary Currents (SVS5425 - perpetual ocean2 CLOSE 095 beauty 600m and below 14000 print)” NASA's Scientific Visualization Studio - NASA/GSFC/Greg Shirah, NASA/GSFC/Horace Mitchell, NASA/GSFC/Atousa Saberi, ADNET Systems, Inc./Laurence Schuler, ADNET Systems, Inc./Ian Jones, JPL/Josh Willis, Advocates in Manpower Management, Inc./Kathleen Gaeta / Public domain (cropped)
- Polar Oceans and Climate: “Deciphering the Maud Rise Polynya in normal color” NASA Earth Observatory images by Lauren Dauphin, using MODIS data from NASA EOSDIS/LANCE and GIBS/Worldview. Story by Kathryn Hansen. / Public domain (cropped)
- Coastal Seas, Continental Shelves, and the Global Ocean: “Sediment in the Bohai Sea, Yellow Sea, and East China Sea (MODIS ) (cropped)” MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
- The Kuroshio and North Pacific Climate: “Western Boundary Currents - The Kuroshio Current” NASA Goddard Space Flight Center / CC BY 2.0 (cropped)
- Related lab (Oka Lab (Division of Climate System Research)): “Deciphering the Maud Rise Polynya in normal color” NASA Earth Observatory images by Lauren Dauphin, using MODIS data from NASA EOSDIS/LANCE and GIBS/Worldview. Story by Kathryn Hansen. / Public domain (cropped)
- Related lab (Oka Lab (Ocean General Circulation Research Group)): “Spring Bloom Colors the Pacific Near Hokkaido” Norman Kuring / Public domain (cropped)
- Related lab (Watanabe Lab): “Blue Marble Western Hemisphere” NASA / Reto Stöckli / Public domain (cropped)
- Related lab (Satoh Lab): “Super Typhoon Oscar SE of Japan near peak intensity (2268-432)” NOAA
（GMS-5衛星） / Public domain (cropped)
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