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JRA-55 is a global reanalysis and the successor of the JRA-25 reanalysis of the Japanese Weather Service "Japan Meteorological Agency" (JMA) and replaces it completely. The aim of the reanalysis was to produce a high-quality and homogeneous dataset suitable for climate research and the study of multi-decadal variability. The data set begins in 1958 and is ongoing.
For the various meteorological variables of the JRA-55, a more sophisticated numerical analysis and weather prediction (NWP) system was implemented, and further observations were included that were not yet available for JRA-25. Many of the shortcomings of JRA-25 reanalysis have been improved or eliminated in JRA-55. The table on the right (Ebita et al., 2011) compares data assimilation methods and constraints of JRA-25 and JRA-55.
ICDC currently offers a selection of meteorological parameters in two different versions.
The selected parameters at different altitude levels were produced by Dr. Christian Franzke. The data set has a daily resolution for the period from 1958 to 2017 and is globally available on a regular 1.25 ° x 1.25 ° grid and, depending on the parameters, in different heights.
In addition, monthly mean values of surface values of various parameters are available, that were prepared by ICDC.
|Name||Description||Unit||Number of Levels|
|var2||Pressure reduced to mean sea level||Pa||1|
|var13||Surface air potential temperature||K||1|
|var11||Surface air temperature||K||1|
|var33||Surface 10m zonal wind||m/s||1|
|var34||Surface 10m meridional wind||m/s||1|
|var18||Surface 2m dew point depression||K||1|
|var51||Surface 2m specific humidity||kg/kg||1|
Period and temporal resolution:
- 1958-01-01 00:00 +0000 to 2013-01-01 00:00 +0000
Coverage and spatial resolution:
- Spatial Resolution: 1.25° x 1.25°, Gaussian Grid
- Geographic longitude: 180.0°W to 180°E
- Geographic latitude: 90.0°S to 90.0°N
- Dimension: 288 columns x 145 rows
Details on the data assimilation and prediction system, as well as some early results of the quality of JRA-55 can be found in Ebita et al. 2007.
Institute: Climate Prediction Division, Global Environment and Marine Department, Japan Meteorological Agency
Email: jra (at) met.kishou.go.jp
Name: Annika Jahnke-Bornemann
Ebita, A., S. Kobayashi, Y. Ota, M. Moriya, R. Kumabe, K. Onogi, Y. Harada, S. Yasui, K. Miyaoka, K. Takahashi, H. Kamahori, C. Kobayashi, H. Endo, M. Soma, Y. Oikawa, and T. Ishimizu, 2011: The Japanese 55-year Reanalysis "JRA-55": an interim report, SOLA, 7, 149-152.
Onogi, K., J. Tsutsui, H. Koide, M. Sakamoto, S. Kobayashi, H. Hatsushika, T. Matsumoto, N. Yamazaki, H. Kamahori, K. Takahashi, S. Kadokura, K. Wada, K. Kato, R. Oyama, T. Ose, N. Mannoji and R. Taira (2007) : The JRA-25 Reanalysis. J. Meteor. Soc. Japan, 85, 369-432.