Description: Das Projekt "Schwerpunktprogramm Massentransporte and Massenverteilungen im System Erde" wird vom Umweltbundesamt gefördert und von Universität Stuttgart, Geodätisches Institut durchgeführt. GRACE gravity measurements provide a direct measure of water storage changes over continents. As such, it enables---for the first time---to close the continental water balance on large scales, and a direct determination of actual evapotranspiration---the unknown component of water balance---from terrestrial precipitation and run-off measurements on large scales. Atmospheric moisture flux offers another independent way of determining water storage changes, where there is no need for evapotranspiration information. This allows for a mutual inter-comparison of data from three independent disciplines and an evaluation of hydrological and atmospheric models. Thus the overall objectives of the project are 1. the direct analysis of large-scale water balances, and 2. the quantification of related uncertainties for large catchment areas in different climatic zones. In order to achieve consistent water balances, the mass change rates from GRACE, hydrology, and hydrometeorology have to be evaluated with respect to natural fluctuations and intrinsic errors. Statistical investigations are needed to characterize the respective contributions. Current results: Mass change estimates from GRACE are more accurate for large catchments (deeper 250,000 sq. km.) than for small catchments. 1. Vertically integrated moisture flux divergences from regional and global atmospheric models provide valuable constraints for estimating mass changes from GRACE. 2. A comparison of GRACE with hydrology datasets indicates that there is a sizeable amount of outliers in GRACE. These outliers have to be removed before any analysis can be done with the GRACE data. 3. Satellite RADAR altimetry provides estimates of runoff from catchments, where in situ measurements are not available, which helps in the validation and evaluation of GRACE derived mass change estimates.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Stuttgart ? Evapotranspiration ? Radar ? Abfluss ? Fällungsreaktion ? Gebäude ? Gravimetrie ? Topographie ? Bewässerung ? Bilanz ? Einzugsgebiet ? Klimamodell ? Schnee ? Statistische Analyse ? Synthese ? Technik ? Wüste ? Luftfeuchtigkeit ? Wasser ? Boden ? Modellierung ? Gebiet ? Hydrologie ? Lagerung ? Produkt ? Globale Aspekte ? Berechnung ? Maßnahme ? Kontinent ? Strategische Aspekte ? Annäherung ? Erfassung ? Ergebnis ? Fehler ? Mischung ? Raum ? Räume ? Verteilung ? Verwertung ? ausgewählt ? fördern ? konventionell ? neu ? regional ? stillgelegt ? verfügbar ? vorschlagen ? Abflussmessung ? Dauer ? Einsatz ?
Region: Baden-Württemberg
Bounding boxes: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-01-01 - 2012-12-31
Webseite zum Förderprojekt
http://massentransporte.de/index.php?id=204 (Webseite)Accessed 1 times.