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NON-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_NTAL this file, last updated 2016-10-05
NTAL 1976 -now (CF)ESMGFZ_NTAL_cf_v1.0_3h_yyyy.ncoperational oceanic loading version v1.0 in center of Earth figure frame.
gridded atmospheric loading from ECMWF surface pressure fields (reduced to reference topography), sampling: 0.5°x0.5°, 3h
variables: duV vertical deformation , unit=m
duNShorizontal deformation North-South, unit=m
duEWhorizontal deformation East-West, unit=m
dggravity change, unit=10-8 m/s2 (mugal)
HYDL (CM)ESMGFZ_NTAL_cm_v1.0_3h_yyyy.ncoperational atmospheric loading version v1.0 in center of Earth mass frame.
NTAL forecast (CF)ESMGFZ_NTAL_cf_v1.0_3h_yyyy_dddF.nclatest 6-day forecast starting from the day of the year "ddd"
NTAL forecast (CM)ESMGFZ_NTAL_cm_v1.0_3h_yyyy_dddF.nc latest 6-day forecast starting from the day of the year "ddd"

ATMOSPHERIC MASS LOADS
Atmospheric mass loads are derived from non-tidal atmospheric surface pressure given by 0.5° x 0.5° 3-hourly ECMWF operational data. Atmospheric tides were removed by harmonic analysis of 10 major tidal constituents. Non-tidal atmospheric surface pressure is resampled on a regular 0.125°x0.125° global grid.

ATMOSPHERIC SURFACE PRESSURE DATA used for NTAL
The operational ECMWF model is typically updated about two times a year to incorporate the most recent improvements in the numerical scheme, the physical model or the data assimilation procedures into the system for steadily improving daily weather forecasting quality. Such changes frequently affect the long-term stability of meteorological quantities in the ECMWF deterministic model, but this operational model data is available in near real-time with substantially higher spatial resolution than the alternatively available atmospheric re-analyses data sets.

Harmonized Atmospheric Surface Pressure Time-Series:
The surface pressure time-series from ECMWF reanalysis ERA-40, ERA-Interim, and operational ECMWF were projected onto a time-invariant reference topography under consideration of the time-variable atmospheric density structure. This approach allows to use the latest data from the operational ECMWF deterministic model maintaining at the same time the long-term stability of re-analysis data sets.

In future, we will use this harmonized atmospheric data sets, updated in near real-time, as consistent basis for the forcing of our ocean model MPIOM, the hydrological model LSDM and all our derived products, such as GRACE AOD, hydrological loading, non-tidal atmospheric loading and non-tidal oceanic loading.

For atmospheric loading the atmospheric tides were removed by harmonic analysis of 9 major tidal constituents.

LOADING CALCULATION / DATA SETS
please go back to the LOADING toplevel directory and have a look at /LOADING/README

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