high-resolution (10 km)
Reanalysis downscaled data over Japan
1. IDENTIFICATION INFORMATION
Namehigh-resolution (10 km) Reanalysis downscaled data over Japan

Editionv1.0

Abbreviation

JP10DOI

doi:10.20783/DIAS.139 [https://doi.org/10.20783/DIAS.139]

Metadata
IdentifierJP1020230727061853-DIAS20221121113753-en

2. CONTACT
2.1 CONTACT on DATASETNameKei Yoshimura

Organization

Scripps Institution of Oceanography

Address

9500 Gilman Dr. 0224, La Jolla, CA, 92093, USA

TEL+1-858-534-5096

FAX+1-858-534-8561

E-mailkeiyoshi08@gmail.com

2.2 CONTACT on PROJECT
2.2.1 Data Integration and Analysis System
Name

DIAS Office

Organization

Japan Agency for Marine-Earth Science and Technology

Address

3173-25, Showa-Cho, Kanazawa-ku, Yokohama-shi, Kanagawa, 236-0001, Japan

E-maildias-office@diasjp.net

3. DOCUMENT AUTHORName

Kei Yoshimura

Organization

Scripps Institution of Oceanography

E-mailkeiyoshi08@gmail.com

4. DATASET CREATOR
1

Name

Masao Kanamitsu

Organization

Scripps Institution of Oceangraphy

E-mailmkanamitsu@ucsd.edu

Name

Hideki Kanamaru

Name

Wataru Ohfuchi

Name

Kei Yoshimura

5. DATE OF THIS DOCUMENT
2023-07-27

6. DATE OF DATASET
�creation : 2009-01-01

7. DATASET OVERVIEW
7.1 Abstract
A 10-km and hourly dynamically downscaling simulation dataset from NCEP/NCAR Reanalysis over Japanfor 1948-2006. The data includes most of 3-dimensional atmospheric state (temperature, wind speed,omega, height, humidity), and various surface fields (precipitation, evaporation, PBL height,surface air condition, radiation, etc.). The data is particularly useful for high resolution
analysis of meteorology, and application for other fields such as agriculture or hydrology.

7.2 Topic Category(ISO19139)
�climatologyMeteorologyAtmosphere

7.3 Temporal Extent
Begin Date

1948-01-01

End Date

2006-12-31

Temporal
Characteristics

Hourly7.4 Geographic Bounding Box
Northlatitudebound 49.163

West
longitudebound 119.96

Eastboundlongitude

151.577South
latitudebound 22.123

2

7.5 Grid
7.6 Geographic Description
Japan, Korea and surrounding oceans

7.7 Keywords
7.7.1 Keywords on Dataset
Keyword Type

Keyword

Keyword
Name

theme

ATMOSPHERIC PROCESSES > Regional modeling, HYDROLOGY > AGU
Hydrometeorology

theme

Climatethesaurus

GEOSS

7.7.2 Keywords on Project
7.7.2.1 Data Integration and Analysis System
Keyword Type

Keyword

KeywordNamethesaurus

theme

DIAS &amp;gt; Data Integration and Analysis System

No_Dictionary

7.8 Online Resource
�Similar products of reanalysis downscaling are available. : http://cec.sdsc.edu/
�file download : https://data.diasjp.net/dl/storages/filelist/dataset:139

7.9 Data Environmental Information
The data was produced in Earth Simulator Center with the Earth Simulator.

7.10 Distribution Information
nameversion

specification

GRIB

Version 1

The contents of the data is writen in Data Remarks.

8. DATA PROCESSING
8.1 Data Processing (1)8.1.1 General Explanation of the data producer's knowledge about thelineage of a dataset
The Scripps version of Regional Spectral Model (RSM; Kanamitsu et al. 2005) is used. The RSM
utilizes a spectral method (with sine and cosine series) in two dimensions. The model configuration3

and the downscaling method in this study are basically the same as that of CaRD10 (10 km California
Reanalysis Downscaling; Kanamitsu and Kanamaru, 2007) but for a domain covering Japan Islands(22.123�49.163N and 119.960�151.577E) and for narrower lateral boundary nudging zones that extends
only 2.5% of the total width in each of four lateral boundaries instead of 11.5% in CaRD10 toincrease the usable domain.
As same as CaRD10, a spectral nudging scheme, i.e., scale selective bias correction (SSBC, Kanamaru
and Kanamitsu 2007), is applied to the Reanalysis large scale thermodynamic fields for a 10 km
horizontal resolution downscaling simulation, to reduce the growth of large-scale error spanning
the regional domain. The scheme consists of three components: 1) dampening the large-scale (morethan 1000 km scale) part of the wind perturbation toward zero, with dampening coefficient of0.9, 2) removing the area average perturbation of temperature and moisture at every model level,and 3) adjusting the area mean perturbation logarithm of surface pressure to the corresponding
difference of logarithm of surface pressure due to the area mean difference in the global andregional topography.

8.1.2 Data Source
Data Source Citation Name

Description of derived parameters and processing
techniques used

9. DATA REMARKS
Each file contains all variables listed below.
[Variable Code] [# of Layer] [GRIB ID] ** [Description of variable]===
HGTprs 25 7,100,0 ** Geopotential height [gpm]RHprs 25 52,100,0 ** Relative humidity [%]SPFHprs 25 51,100,0 ** Specific humidity [kg/kg]
TMPprs 25 11,100,0 ** Temp. [K]UGRDprs 25 33,100,0 ** u wind [m/s]
VGRDprs 25 34,100,0 ** v wind [m/s]
VVELprs 25 39,100,0 ** Pressure vertical velocity [Pa/s]
ALBDOsfc 0 84,1,0 ** surface Albedo [%]ALHTFsfc 0 236,1,0 ** Adjusted latent heat [W/m^2]
BGRUNsfc 0 234,1,0 ** surface Baseflow-groundwater runoff [kg/m^2]
CNWATsfc 0 223,1,0 ** surface Plant canopy surface water [kg/m^2]
CPRATsfc 0 214,1,0 ** surface Convective precip. rate [kg/m^2/s]
DLWRFsfc 0 205,1,0 ** surface Downward long wave flux [W/m^2]
DSWRFsfc 0 204,1,0 ** surface Downward short wave flux [W/m^2]
DSWRFtoa 0 204,8,0 ** top of atmos Downward short wave flux [W/m^2]
ECPYsfc 0 180,1,0 ** canopy reevaporation [W/m^2]

4GFLUXsfc 0 155,1,0 ** surface Ground heat flux [W/m^2]
HGTsfc 0 7,1,0 ** surface Geopotential height [gpm]HPBLsfc 0 221,1,0 ** surface Planetary boundary layer height [m]ICECsfc 0 91,1,0 ** surface Ice concentration (ice=1;no ice=0) [fraction]
LANDsfc 0 81,1,0 ** surface Land cover (land=1;sea=0) [fraction]
LFTX4sfc 0 132,1,0 ** surface Best (4-layer) lifted index [K]
LFTXsfc 0 131,1,0 ** surface Surface lifted index [K]
LHTFLsfc 0 121,1,0 ** surface Latent heat flux [W/m^2]
PEVPRsfc 0 145,1,0 ** surface Potential evaporation rate [W/m^2]
PRATEsfc 0 59,1,0 ** surface Precipitation rate [kg/m^2/s]
PRESsfc 0 1,1,0 ** surface Pressure [Pa]PRMSLmsl 0 2,102,0 ** Pressure reduced to MSL [Pa]PTENDsfc 0 3,1,0 ** surface Pressure tendency [Pa/s]
PWATclm 0 54,200,0 ** atmos column Precipitable water [kg/m^2]
QUFLXclm 0 202,200,0 ** Vertical integrated moisture flux zonal [kg/m/s]
QVFLXclm 0 203,200,0 ** Vertical integrated moisture flux meridional [kg/m/s]
SFCRsfc 0 83,1,0 ** surface Surface roughness [m]SHTFLsfc 0 122,1,0 ** surface Sensible heat flux [W/m^2]
SLTYPsfc 0 154,1,0 ** Soil type [ND]
SNOEVsfc 0 230,1,0 ** snow sublimation [W/m^2]
SNOHFsfc 0 229,1,0 ** surface Snow phase-change heat flux [W/m^2]
SOILW1 0 144,112,10 ** 0-10 cm undergnd Volumetric soil moisture [fraction]
SOILW2 0 144,112,2760 ** 10-200 cm undergnd Volumetric soil moisture [fraction]
SPFH2m 0 51,105,2 ** 2 m Specific humidity [kg/kg]
SRWEQsfc 0 64,1,0 ** surface Snowfall rate water equiv. [kg/m^2/s]
TCDCclm 0 71,200,0 ** atmos column Total cloud cover [%]TCDClcl 0 71,214,0 ** low cloud level Total cloud cover [%]TCDCmcl 0 71,224,0 ** mid-cloud level Total cloud cover [%]TCDChcl 0 71,234,0 ** high cloud level Total cloud cover [%]TMAX2m 0 15,105,2 ** 2 m Max. temp. [K]TMIN2m 0 16,105,2 ** 2 m Min. temp. [K]TMPsfc 0 11,1,0 ** surface Temp. [K]5

TMP2m 0 11,105,2 ** 2 m Temp. [K]
TMPSoil1 0 11,112,10 ** 0-10 cm undergnd Temp. [K]
TMPSoil2 0 11,112,2760 ** 10-200 cm undergnd Temp. [K]UGWDsfc 0 147,1,0 ** surface Zonal gravity wave stress [N/m^2]
UFLXsfc 0 124,1,0 ** surface Zonal momentum flux [N/m^2]
UGRD10m 0 33,105,10 ** 10 m u wind [m/s]
ULWRFsfc 0 212,1,0 ** surface Upward long wave flux [W/m^2]
ULWRFtoa 0 212,8,0 ** top of atmos Upward long wave flux [W/m^2]
USWRFsfc 0 211,1,0 ** surface Upward short wave flux [W/m^2]
USWRFtoa 0 211,8,0 ** top of atmos Upward short wave flux [W/m^2]
VGWDsfc 0 148,1,0 ** surface Meridional gravity wave stress [N/m^2]
VEGsfc 0 87,1,0 ** surface Vegetation [%]VFLXsfc 0 125,1,0 ** surface Meridional momentum flux [N/m^2]
VGRD10m 0 34,105,10 ** 10 m v wind [m/s]
VGTYPsfc 0 225,1,0 ** surface Vegetation type (as in SiB) [0..13]
WATRsfc 0 90,1,0 ** surface Water runoff [kg/m^2]
WEASDsfc 0 65,1,0 ** surface Accum. snow [kg/m^2]

10. DATA POLICY
10.1 Data Policy by the Data Provider
The data (JP10 data hereafter) are made freely available to the public and the scientific community
in the belief that their wide dissemination will lead to greater understanding and new scientificinsights. The user should follow the data policy and constraints of DIAS in addition to theconstraints written here. The availability of JP10 data does not constitute publication of thedata. We rely on the ethics and integrity of the user to assure that the Experimental Climate
Prediction Center in Scripps Institution of Oceanography (ECPC hereafter) receives fair credit for
the work. If JP10 data are obtained for potential use in a publication or presentation, ECPC should
be informed at the outset of the nature of this work. Manuscripts using JP10 data should be sent
to ECPC for review before they are submitted for publication so that it can be insured that thequality and limitations of JP10 data are accurately represented.

10.2 Data Policy by the Project
10.2.1 Data Integration and Analysis System
If data provider does not have data policy, DIAS Terms of Service (https://diasjp.net/en/terms/)
and DIAS Privacy Policy (https://diasjp.net/en/privacy/) apply.
If there is a conflict between DIAS Terms of Service and data provider's policy, the data provider'spolicy shall prevail.

611. LICENSE
12. DATA SOURCE ACKNOWLEDGEMENT
12.1 Acknowledge the Data Provider
12.2 Acknowledge the Project
12.2.1 Data Integration and Analysis System
If you plan to use this dataset for a conference presentation, paper, journal article, or reportetc., please include acknowledgments referred to following examples. If the data provider describes
examples of acknowledgments, include them as well.
" In this study, [Name of Dataset] provided by [Name of Data Provider] was utilized. This dataset
was also collected and provided under the Data Integration and Analysis System (DIAS), which wasdeveloped and operated by a project supported by the Ministry of Education, Culture, Sports, Scienceand Technology. "13. REFERENCES

7