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| Titel |
Sensitivity of elastic surface deformations caused by atmospheric, hydrologic, and oceanic loads to the Earth’s crust and mantle properties |
| VerfasserIn |
Robert Dill, Volker Klemann, Mikhail Kaban, Henryk Dobslaw, Maik Thomas |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126678
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| Publikation (Nr.) |
 EGU/EGU2016-6434.pdf |
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| Zusammenfassung |
| The elastic deformation of the Earth’s surface due to atmospheric surface pressure, terrestrial
water storage, and ocean bottom pressure on seasonal or shorter time scales is usually
represented by a set of elastic load Love numbers or the corresponding Green’s function,
determined from a radial Earth structure like PREM. Thereby, the influence of local
deviations of the Earth’s crustal and mantle properties is assumed to be negligible. However,
local Green’s functions derived individually for 1∘ grid cells from the 3D crustal structure
model CRUST1 show large variations for in particular smaller distance angles. The loading
response due to small-scale surface loads extending over less than 2500km2 significantly
depends on the heterogeneous shallow structure of the Earth. In this contribution, we discuss
the influence of lateral variations in the crust and mantle structure on atmospheric,
hydrologic, and oceanic surface loads with regard to their spatial scales and distribution.
Non-tidal atmospheric loading is calculated from an atmospheric surface pressure time series
covering four decades (1976 - 2015) based on 3-hourly atmospheric data of ECMWF
that has been homogenized by mapping surface pressure to a common reference
orography. Hydrological loading is calculated for daily terrestrial water storage from
LSDM over the same time period, where the surface water compartment is mapped
from the 0.5∘ model resolution to a 0.125∘ GIS-based river network. Ocean tidal
loading is exemplarily calculated based on the FES2014 ocean tidal model (0.0625∘).
Especially along the coasts of the oceans; in regions with steep orographic gradients;
and in areas with thick crustal layers or sediments we will show the significant
influence of the Earth’s structure on small-scale deformation features caused by surface
loads. |
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