README

Entry Information

:heading 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.

Files in this directory:

README_TAL

this file, last updated 2019-05-10

ESMGFZ_TAL.S1_CF_yyyy.nc

Tidal 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_phase	vertical deformation phase, unit=degree
	duNS_amplitude	horizontal North-South deformation amplitude, unit=cm
	duNS_phase	horizontal North-South deformation phase, unit=degree
	duEW_amplitude	horizontal deformation East-West amplitude, unit=cm
	duEW_phase	horizontal East-West deformation phase, unit=degree

ESMGFZ_TAL.S1_CM_yyyy.nc

Tidal 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	Argument	Frequency (degree/hour)
P1	t−h−90◦	14.9589314
S1	t+ 180◦	15.0000000
K1	t+h+ 90◦	15.0410686
N2	2t−3s+ 2h+p	28.4397295
M2	2t−2s+ 2h	28.9841042
L2	2t−s+ 2h−p+ 180◦	29.5284789
T2	2t−h+p′	29.9589333
S2	2t	30.0000000
R2	2t+h−p′+ 180◦	30.0410667
T3	3t−h	44.9589300
S3	3t	45.0000000
R3	3t+h	45.0410700

README_TAL

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