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HYDOLOGICAL LOADING

from LSDM forced by ECMWF operational atmospheric data
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_HYDL             this file, last updated 2016-10-05
HYDL 1976 -now (CF)ESMGFZ_HYDL_cf_v1.3_24h_yyyy.ncoperational hydrol. loading version v1.3 in center of Earth figure frame.
gridded hydrological loading from mass distributions (incl. rivermass) of LSDM, forced with same ECMWF operational data (reduced to reference topography) as NTAL and NTOL sampling: 0.5°x0.5°, 24h
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_HYDL_cm_v1.3_24h_yyyy.ncoperational hydrol. loading version v1.3 in center of Earth mass frame.
HYDL forecast (CF)ESMGFZ_HYDL_cf_v1.3_24h_yyyy_dddF.nclatest 6-day forecast starting from the day of the year "ddd"
HYDL forecast (CM)ESMGFZ_HYDL_cm_v1.3_24h_yyyy_dddF.nc  latest 6-day forecast starting from the day of the year "ddd"

HYDROLOGICAL MASS LOADS
Mass loads are given from the global hydrological model LSDM as soil moisture, snow, surface water, and water in rivers and lakes. LSDM masses are given on a regular 0.5°x0.5° global grid with daily time steps. A mean mass, from 2003-2014, is subtracted. Masses are resampled to 0.125x0.125 degree and a 0.125x0.125 degree land-sea mask is applied. The rivermasses are treated separately,by re-allocating the rivermasses from the model 0.5° rivernetwork to a high-resolution0.125° GIS-based rivernetwork in order to concentrate the river masses to a morereal river location than in the 0.5° model rivernetwork.

HYDL version v1:
outdated version!
based on water storage from LSDM forced with 24h 1°x1° ECMWF operational atmospheric data.

HYDL version v1.2:
please cancel this version !!!
big error in the mass redistribution from the model 0.5 coastline to the refined 0.125° coastline.

HYDL version v1.3:
based on water storage from new LSDM version2 (updated glacier definitions in the Himalaya region) using new 24h 0.5°x0.5° ECMWF operational forcing data that was preprocessed to a commonly defined high-resolution reference topography in order to avoid inconsistencies between different ECMWF model setups (ERA40, ERAInterim, operational). This forcing data set is consistent with AOD1B RL06.

References:
When using hydrological loading data, the approach and the LSDM model should be cited as
Dill, R. and H. Dobslaw (2013), Numerical simulations of global-scale high-resolution hydrological crustal deformations, J. Geophys. Res. Solid earth 118, doi:10.1002/jgrb.50353.

More details about the hydrological model LSDM can be found in
Dill, R. (2008), Hydrological model LSDM for operational Earth rotation and gravity field variations. Scientific Technical Report STR08/09, GFZ Potsdam, Germany, 35p.

ATMOSPHERIC FORCING DATA for hydrological model LSDM used for HYDL version v1.3
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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