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Kosaka Lab (Global Climate Dynamics)
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The lab uses data and simulations to explore chains of extreme weather events across distant regions, along with global warming.
AboutAbout the lab
Getting to the bottom of why the climate fluctuates.
The Kosaka Lab (Global Climate Dynamics) studies the mechanisms by which the Earth's climate as a whole fluctuates and shifts.
Using global observational data and climate models, the lab works on a wide range of topics, from the mechanisms behind extreme weather to future projections of global warming.
The lab looks at both human-caused warming and natural variability, the two sources of climate fluctuations.
The lab is located in the Research Center for Advanced Science and Technology and has many connections with researchers overseas.
Key terms
- Teleconnection
- A phenomenon in which atmospheric changes in one place affect the weather in distant regions
- Atmosphere-ocean interaction
- The mutual influence of the atmosphere and the ocean through heat, water, and wind
- Reanalysis data
- Data that reconstruct the state of the atmosphere on a fine grid in time and space by incorporating past observations into a numerical weather model
NewsLab news
View More ↗ResearchResearch themes
The lab studies how the climate system, shaped by the mutual influence of the atmosphere and the ocean, fluctuates and shifts. By analyzing huge volumes of data and running climate model simulations, it aims to understand the global-scale connections within the climate and to find clues for prediction.
*Illustrative imageTeleconnections and Extreme Weather
Global-scale climate variability is shaped by teleconnections and atmosphere-ocean interaction. Large-scale atmospheric variations change the climate of distant regions at the same time. Slowly varying ocean variability influences climate around the world over timescales from several months to several decades through teleconnections, and also serves as a key to predicting weather conditions in advance.
*Illustrative imageNatural Variability and Global Warming
Natural climate variability interferes with human-caused global warming and at times brings even more intense heat waves. Conversely, it can also temporarily cause cooling that runs counter to warming. The lab investigates such climate variations using reanalysis data and ensemble simulations of climate models.
*Illustrative imageDeveloping Regional Weather Data for Japan
The lab produces regional weather reanalysis data that reconstructs the state of the atmosphere over Japan and its surroundings from the past at fine intervals. As a core member of ClimCORE, a project carried out in collaboration with organizations such as the Japan Meteorological Agency, the lab is also improving precipitation data that combine rain gauges and radar.
MembersFaculty
- Associate ProfessorYu KosakaPublications ↗
- Project Associate ProfessorTakafumi Miyasaka
- Project Assistant ProfessorMasato Mori
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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. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Himawari 8 Full Disk Aug Z” Himawari 8 satellite operated by the Japan Meteorological Agency / Public domain (cropped)
- Teleconnections and Extreme Weather: “HoloGlobe- Sea Surface Temperature and Temperature Anomaly on a Flat Earth (SVS1275 - SSTAflat Dec 1982)” NASA's Scientific Visualization Studio - Jim Strong, Tom Watters / Public domain (cropped)
- Natural Variability and Global Warming: “2024 Was the Warmest Year on Record (153806)” NASA Earth Observatory images by Michala Garrison, based on data from the NASA Goddard Institute for Space Studies. Story by Sally Younger, NASA’s Earth Science News Team. / Public domain (cropped)
- Developing Regional Weather Data for Japan: “Shanshan Z TRMM” Images produced by Hal Pierce (SSAI/NASA GSFC) and caption by Steve Lang (SSAI/NASA GSFC). / Public domain (cropped)
- Related lab (Imada Lab): “Cumulonimbus cloud ( )” contri / CC BY-SA 2.0 (cropped)
- Related lab (Yoshimori Lab): “Mosaic of the Arctic” NASA / Public domain (cropped)
- Related lab (Iga Lab (Dynamic Marine Meteorology Group, DMMG)): “Sea of Japan polar low Z” VIIRS image captured by NOAA’s Suomi NPP satellite / Public domain (cropped)
- Related lab (Watanabe Lab): “Blue Marble Western Hemisphere” NASA / Reto Stöckli / Public domain (cropped)
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