TY - JOUR
T1 - Evaluating terrestrial water storage variations from regionally constrained GRACE mascon data and hydrological models over Southern Africa - preliminary results
AU - Krogh, Pernille E.
AU - Andersen, Ole B.
AU - Michailovsky, Claire I.B.
AU - Bauer-Gottwein, Peter
AU - Rowlands, David D.
AU - Luthcke, Scott B.
AU - Chinn, Douglas S.
N1 - Funding Information:
This work is a part of the HYDROGRAV project, financed by the Danish Agency for Science, Technology and Innovation. Thanks to R. Smith (De Montfort University, EAPRS Lab, Leicester, UK) for supplying satellite altimetry data from Lake Malawi.
PY - 2010/4
Y1 - 2010/4
N2 - A concentration of surface mass has a distinct, localized signature in Gravity Recovery and Climate Experiment (GRACE) K-band range rate (KBRR) data. This fact is exploited in the regional solutions for mass concentration parameters (mascons) made at the Goddard Space Flight Center (GSFC). In this paper we explore an experimental set of regionally constrained mascon blocks over Southern Africa where a system of 1.25° × 1.5° and 1.5° × 1.5° blocks has been designed. The blocks are divided into hydrological regions based on drainage patterns of the largest river basins, and are constrained in different ways. We show that the use of regional constraints, when solving mascon parameters of different hydrological regions independently, yields more detail and variation than comparable spherical harmonic solutions and mascon solutions using isotropic constraints. We validate our results over Lake Malawi with water level from altimetry. Results show that weak constraints across regions in addition to intra-regional constraints are necessary, to reach reasonable mass variations.
AB - A concentration of surface mass has a distinct, localized signature in Gravity Recovery and Climate Experiment (GRACE) K-band range rate (KBRR) data. This fact is exploited in the regional solutions for mass concentration parameters (mascons) made at the Goddard Space Flight Center (GSFC). In this paper we explore an experimental set of regionally constrained mascon blocks over Southern Africa where a system of 1.25° × 1.5° and 1.5° × 1.5° blocks has been designed. The blocks are divided into hydrological regions based on drainage patterns of the largest river basins, and are constrained in different ways. We show that the use of regional constraints, when solving mascon parameters of different hydrological regions independently, yields more detail and variation than comparable spherical harmonic solutions and mascon solutions using isotropic constraints. We validate our results over Lake Malawi with water level from altimetry. Results show that weak constraints across regions in addition to intra-regional constraints are necessary, to reach reasonable mass variations.
UR - http://www.scopus.com/inward/record.url?scp=77955146921&partnerID=8YFLogxK
U2 - 10.1080/01431161.2010.483483
DO - 10.1080/01431161.2010.483483
M3 - Journal article
AN - SCOPUS:77955146921
VL - 31
SP - 3899
EP - 3912
JO - International Journal of Remote Sensing
JF - International Journal of Remote Sensing
SN - 0143-1161
IS - 14
ER -