Volume XLII-2/W13
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W13, 1793-1796, 2019
https://doi.org/10.5194/isprs-archives-XLII-2-W13-1793-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W13, 1793-1796, 2019
https://doi.org/10.5194/isprs-archives-XLII-2-W13-1793-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  05 Jun 2019

05 Jun 2019

CONVERSE TRENDS OF THE TERRESTRIAL AND GROUND WATER STORAGE CHANGES IN CANADA AND THE UNITED STATES

H. Wang1,2, L. Xiang1, H. Steffen3, P. Wu4, L. Jiang1, Q. Shen1, D. Piretzidis5, M. G. Sideris5, M. Hayashi4, and L. Jia6 H. Wang et al.
  • 1State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Xudong Street, Wuhan, China
  • 2University of Chinese Academy of Sciences, Beijing, China
  • 3Lantmäteriet, 80182 Gävle, Sweden
  • 4Department of Geoscience, University of Calgary, Calgary T2N 1N4, Canada
  • 5Department of Geomatics Engineering, University of Calgary, Calgary T2N 1N4, Canada
  • 6National Earthquake Infrastructure Service, Beijing 100036, China

Keywords: Canada and United States, Total water storage changes, Ground water storage changes, GRACE data, GPS data

Abstract. We study the terrestrial water storage (TWS) and groundwater storage (GWS) changes in Canada and United States. We employ the separation approach from Wang et al. (2013) together with the improved GRACE data of Release 6 for a longer time span until December, 2016. The TWS signals from lake levels are derived from satellite altimetry data over the lakes while TWS signals due to soil moisture (SM) and snow water equivalent (SWE) changes from hydrology models. There are four significant trend anomalies in North America for both TWS and GWS changes. Two positive anomalies are found in Canada with their centers in the provinces of Saskatchewan and Quebec, respectively, due to increased precipitation and/or increased runoff in their surroundings. Two negative anomalies are shown in the United States with their centers in California and the northwest of Texas, respectively, which are due to decreased precipitation and, especially for California, high water usage for agriculture.