Product: Global Oceanic Angular Momentum
OAM - johnson01 - Version metadata

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Title

OAM - johnson01
Date

2020-08-12
Volume

johnson01
Content

Global oceanic angular momentum mass and motion terms
Ocean model : Parallel Ocean Climate Model (POCM) version 4B
Horizontal domain : 75 degree South latitude to 65 degree North latitude
Horizontal resolution : 0.4 degree long. by 0.4cos(lat) degree lat. averaged to 1 degree by 1 degree
Vertical resolution : 20 levels averaged to 6 levels
Boussinesq model? : Yes
Tabulated mass term corrected for volume changes due to steric effects? : Yes

Ocean model forcing :
Surface wind stress : 3-day-averaged ECMWF
Surface heat flux : Monthly ECMWF
Surface freshwater flux : None
Surface pressure : None

Data assimilated : None

Documentation

File units : kg-m**2/s 1. The tabulated OAM values have been determined as described in Johnson et al. (JGR, 104,
25183-25195, 1999) except for the method of correcting the mass term for volume changes
due to steric effects (see Note 3 below).

2. Unlike johnson99.oam, the tabulated OAM values in johnson01.oam have NO filtering or
smoothing applied. Therefore, unlike johnson99.oam, this dataset does NOT need to be
scaled by 8/3 to correct the normalization of the filter.

3. The tabulated OAM values are given at 3-day intervals except for the values on
MJD 47222, 48684, and 50143 which are given 4 days after the previous value.
This extra long interval was required because of the neglect of leap days
(February 29) in the POCM_4B output.

4. The tabulated values for the mass term have been corrected for volume changes due to
steric effects by adding a uniform layer of fluctuating thickness to the sea surface
height fields of POCM_4B (Greatbatch, JGR, 99, 12767-12771, 1994). This is different
from the method described in Johnson et al. (JGR, 104, 25183-25195, 1999).

5. The mean has been removed from the tabulated OAM values.
The mean OAM mass term (kg-m**2/s; x,y,z) = 1.3094491e+29 9.8501954e+28 2.6128137e+30
The mean OAM motion term (kg-m**2/s; x,y,z) = -8.7676704e+23 -1.7908617e+22 1.2840290e+25

Time Interval

3-day instantaneous values
Time Start

1988-01-01
Time End

1997-12-30
Data Points

1217
Data

MJD, mass_X, mass_Y, mass_Z, motion_X, motion_Y, motion_Z
Format

ASCII
Frequency

Irregular
Keywords

Geophysical fluids, OAM
Reference

Johnson et al., J. Geophys. Res., vol. 104, pp. 25183-25195, 1999
Stammer et al., J. Geophys. Res., vol. 101, pp. 25779-25811, 1996
Published by

GGFC Special Bureau for the Oceans
Contact

tj@CasA.usno.navy.mil
Distribution

onLine
Source

ftp://rz-ftp2.gfz.de/2025012844000415-esmdata/Products/GGFC-Oceans/OAM/johnson01.oam