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East Asian Seas Regional Climatology

Version 2.0: This version of the regional climatology is an update to the preliminary version released in May 2012. This update includes new temperature and salinity data spanning the database period from 1804 to 2013. The climatology was recalculated based on the new data received.



Study area: 115°E to 143°E longitude and 24°N to 52°N latitude.

Temporal resolution: The climatologies for temperature and salinity use all available data regardless of year of measurement. Climatologies were calculated for the annual (all-data), seasonal, and monthly time periods. Seasons are defined as: Winter (Jan.-Mar.), Spring (Apr.-Jun.), Summer (Jul.-Sep.), Fall (Oct.-Dec.).

Horizontal resolution: Temperature and salinity are available on a 1x1, 1/4, and 1/10 latitude/longitude degree grid.

Vertical resolution: Annual and seasonal climatologies are available from the surface to 5500 meter depths. Monthly climatologies are available from the surface to 1500 meter depths.

Data: All data used to generate the EAS-RC is based on the most recent edition of the World Ocean Database 2013 (WOD13). A description of the WOD13 data sets can be found in World Ocean Database 2013 Introduction (6.8 MB).

Data formats: The EAS-RC objective analyses and statistics data are presented in ASCII, comma separated value (CSV), ArcGIS compatible and netCDF formats.

Units: Temperature units are °C. Salinity is unitless on the Practical Salinity Scale-1978 [PSS]. Data distribution units are in number of observations in each grid box.

Bathymetry: For the one degree and quarter degree climatologies, the mean value within a grid square from the ETOPO2 was used. For the one-tenth degree climatologies, the mean value within a grid square from the ETOPO1 was used.

Method: The methods used for calculating the mean climatological fields is described in Locarnini et al., 2013 for temperature and Zweng et al., 2013 for salinity.

Additional details on the 1/4° climatological calculation are found in Boyer et al., 2005. Table 1 gives radii of influence for all three passes through the objective analysis procedure for each horizontal resolution.

Table 1

Pass1° radius of influence1/4° radius of influence1/10° radius of influence
1892 km321 km211 km
2669 km267 km155 km
3446 km214 km111 km

References:

Amante, C., B. W. Eakins, 2009. ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis. NOAA Technical Memorandum NESDIS NGDC-24. National Geophysical Data Center, NOAA. doi:10.7289/V5C8276M.

Boyer, T., S. Levitus, H. Garcia, R. A. Locarnini, C. Stephens, J. Antonov, 2005: Objective analyses of annual, seasonal, and monthly temperature and salinity for the world ocean on a 0.25 degree grid. International Journal of Climatology, 25(7), 931-945.

Boyer, T. P., J. I. Antonov, O. K. Baranova, C. Coleman, H. E. Garcia, A. Grodsky, D. R. Johnson, R. A. Locarnini, A. V. Mishonov, T. D. O'Brien, C. R. Paver, J. R. Reagan, D. Seidov, I. V. Smolyar, M. M. Zweng, 2013: World Ocean Database 2013. Sydney Levitus, Ed.; Alexey Mishonov, Technical Ed.; NOAA Atlas NESDIS 72, 209 pp.

Levitus, S., 1982: Climatological Atlas of the World Ocean, NOAA Professional Paper 13, U.S. Gov. Printing Office, Rockville, M.D., 190 pp.

Locarnini, R. A., A. V. Mishonov, J. I. Antonov, T. P. Boyer, H. E. Garcia, O. K. Baranova, M. M. Zweng, C. R. Paver, J. R. Reagan, D. R. Johnson, M. Hamilton, and D. Seidov, 2013: World Ocean Atlas 2013, Volume 1: Temperature. S. Levitus, Ed., A. Mishonov Technical Ed.; NOAA Atlas NESDIS 73, 40 pp.

National Geophysical Data Center, 2006. U.S. Department of Commerce, National Oceanic and Atmospheric Administration, 2-minute Gridded Global Relief Data (ETOPO2v2).

Zweng, M. M, J. R. Reagan, J. I. Antonov, R. A. Locarnini, A. V. Mishonov, T. P. Boyer, H. E. Garcia, O. K. Baranova, D. R. Johnson, D. Seidov and M. M. Biddle, 2013: World Ocean Atlas 2013, Volume 2: Salinity. S. Levitus, Ed., A. Mishonov Technical Ed.; NOAA Atlas NESDIS 74, 39 pp.