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TIDAL ATMOSPHERIC LOADING

from operational ECMWF atmospheric surface pressure
produced by IERS Associated Product Centre Deutsches GeoForschungsZentrum GFZ Potsdam

Author: M. Thomas (mthomas@gfz-potsdam.de) R. Dill (dill@gfz-potsdam.de) H. Dobslaw (dobslaw@gfz-potsdam.de)
Affiliation: Deutsches GeoForschungsZentrum GFZ Dep. 1: Geodesy and Remote Sensing Sec. 1.3: Earth System Modelling Telegrafenberg 14473 Potsdam, Germany

GFZ provides these data as Associated Product Centre by order of the International Earth Rotation and Reference System Service (IERS). The data is public availably without any warranty of any kind what so ever, either express or implied, including warranties of merchantability. GFZ shall not be liable for incidental, consequential, or special consequences arising out of the use of this data.

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README_TAL this file, last updated 2019-05-10
ESMGFZ_TAL.S1_CF_yyyy.ncTidal atmospheric loading, center of figure
from partial tides estimated from ECMWF operational surface pressure data
sampling:    0.5°x0.5°
variables:    duV_amplitude        vertical deformation amplitude , unit=cm
duV_phasevertical deformation phase, unit=degree
duNS_amplitudehorizontal North-South deformation amplitude, unit=cm
duNS_phasehorizontal North-South deformation phase, unit=degree
duEW_amplitudehorizontal deformation East-West amplitude, unit=cm
duEW_phasehorizontal East-West deformation phase, unit=degree
ESMGFZ_TAL.S1_CM_yyyy.ncTidal atmospheric loading, center of mass

ATMOSPHERIC TIDES
Tidal atmospheric loading is calculated for the partial atmospheric tides that were removed for NTAL and AOD1B by harmonic analysis of 12 major tidal constituents of the ECMWF 3h atmospheric surface pressure forcing data. Tidal analysis has been done for each year from 1976 until 2006 seperately. Since 2007 we use the tidal signal estimated for the epoch 2007 until 2014. The TAL from this period 2007-2014 can be used as TAL for all epochs.

Tidal constituents estimated and removed from atmospheric surface pressure before calculation of NTAL

partial tide    ArgumentFrequency (degree/hour)
P1t−h−90◦14.9589314
S1t+ 180◦15.0000000
K1t+h+ 90◦15.0410686
N22t−3s+ 2h+p28.4397295
M22t−2s+ 2h28.9841042
L22t−s+ 2h−p+ 180◦    29.5284789
T22t−h+p′29.9589333
S22t30.0000000
R22t+h−p′+ 180◦    30.0410667
T33t−h44.9589300
S33t45.0000000
R33t+h45.0410700
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