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A. Güntner | Hydrogravimetry 1 Sub-humid climate (Mediterranean) Mean annual precipitation: 1200 mm, (highly seasonal) Elevation: 160 m amsl Early results.

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Presentation on theme: "A. Güntner | Hydrogravimetry 1 Sub-humid climate (Mediterranean) Mean annual precipitation: 1200 mm, (highly seasonal) Elevation: 160 m amsl Early results."— Presentation transcript:

1 A. Güntner | Hydrogravimetry 1 Sub-humid climate (Mediterranean) Mean annual precipitation: 1200 mm, (highly seasonal) Elevation: 160 m amsl Early results at Concepción / Chile SG gravity residuals (tides, atmosphere, polar motion removed) Gravimetric response of near-surface soil moisture

2 A. Güntner | Hydrogravimetry 2 Non-tidal ocean loading effect: Concepción Distance to the coastline: 11 km Ocean bottom pressure models: The Ocean Model for Circulation and Tides (OMCT) Water column + atmospheric pressure (6 h) Estimation of the Circulation and Climate of the Ocean (ECCO1) Gravity response: GGP Loading service (12 h, http://loading.u-strasbg.fr/GGP/ )

3 A. Güntner | Hydrogravimetry 3 Global hydrological effect Attraction and loading effect of hydrological mass variations beyond 0.1° (approx. 11 km) Sutherland Concepción Relatively small amplitude in comparison to SG sites in Central Europe (e.g. amplitude for Wettzell is about 2 µGal)

4 A. Güntner | Hydrogravimetry 4 Relatively small amplitude in comparison to European SG sites –Smaller regional integration area SutherlandConcepciónWettzell Gravity response to 1 kg/m 2 (logarithm) log(m.s -2 ) Global hydrological effect

5 A. Güntner | Hydrogravimetry 5 - + + + - - + kg/m 2 : + SutherlandConcepciónWettzell Relatively small amplitude in comparison to European SG sites –Smaller regional integration area –Seasonally compensating continental-scale effects Global hydrological effect WGHM Total water storage anomaly: 08/2003 – average(2000-2012)

6 A. Güntner | Hydrogravimetry 6 Groundwater well Soil moisture sensors Climate station Groundwater well (since 04/12) Gravity variations at Concepción - Local hydrology - TDR cluster with about 40 sensors up to 3.5m in depth

7 A. Güntner | Hydrogravimetry 7 Soil depth [m] Soil moisture variations Vol% Local hydrology in Concepción (Chile)

8 A. Güntner | Hydrogravimetry 8 Soil depth [m] Local hydrology in Concepción (Chile) Soil moisture and groundwater variations Groundwater (m below surface) Vol%

9 A. Güntner | Hydrogravimetry 9 Silty loam Clayey loam 3,5m Weathered Granite 22m Granite SG gravity residuals Gravity variations at Concepción - Local hydrology - Gravity (μGal) SG038

10 A. Güntner | Hydrogravimetry 10 Soil moisture Silty loam Clayey loam 3,5m Weathered Granite 22m Granite SG gravity residuals Soil moisture (observed) Gravity variations at Concepción - Local hydrology - Gravity (μGal) SG038

11 A. Güntner | Hydrogravimetry 11 Groundwater Silty loam Clayey loam 3,5m Weathered Granite 22m Granite Gravity variations at Concepción - Local hydrology - SG gravity residuals Soil moisture (observed) Soil moisture + groundwater (observed) Soil moisture Gravity (μGal) SG038

12 A. Güntner | Hydrogravimetry 12 Vadose Zone Silty loam Clayey loam 3,5m Weathered Granite 22m Granite Gravity variations at Concepción - Local hydrology - SG gravity residuals Soil moisture (observed) Soil moisture + groundwater (observed) Soil moisture + groundwater (observed) + vadose zone (simulated by hydrological model) Soil moisture Groundwater Gravity (μGal) SG038

13 A. Güntner | Hydrogravimetry 13 Gravity variations at Concepción - Local hydrology - What causes the large seasonal gravity signal? 1)Variations of station elevation can be excluded based on GPS data 2)Non-tidal ocean loading effects are too small 3)Global hydrological effects are too small Local water storage variations in deep unsaturated zone

14 A. Güntner | Hydrogravimetry 14 TIGO Global hydrological effect Local effect: observed SM variation (integration radius ≤ 0.1°) Global effect: WGHM TWS (integration radius > 0.1°)

15 A. Güntner | Hydrogravimetry 15 WETTZELL Global hydrological effect Local effect: modeled TWS variation (Creutzfeld et al., 2012) Global effect: WGHM TWS (integration radius > 0.1°)

16 A. Güntner | Hydrogravimetry 16 Geodetic Observatory Wettzell Gravimeter building Hydro-meteorological monitoring network

17 A. Güntner | Hydrogravimetry 17 Snow Top soil Saprolith Groundwater Gravimeter signal Creutzfeldt et al. (2010), WRR Gravity signals of different storage compartments in Wettzell Soil

18 A. Güntner | Hydrogravimetry 18 (hydrological monitoring) (gravimeter) Creutzfeldt et al., 2010 (GJI) Gravimeter signal (SG) and gravity response of local water storage variations (from independent hydrol. measurements)

19 A. Güntner | Hydrogravimetry 19 Hydrological extremes and their impact on the water cycle Creutzfeldt et al. 2012, JGR Water storage derived from Superconducting gravimeter (Wettzell, Bavarian Forest, Germany) Water storage (mm) Drought in Central Europe (2003)

20 A. Güntner | Hydrogravimetry 20 Hydrological extremes and their impact on the water cycle Water storage in Wettzell (Germany) Drought in Central Europe (2003) Soil moisture Gravimeter- based water storage

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