Studies of Antarctic Ice Shelf Ocean Tides and Wetland Hydrology Using ALOS/PALSAR Interferometry
C.K. Shum(1), Zhong Lu(2), Jin-woo Kim(1), Hyongki Lee(1), Sangho Baek(3) and Alexandar Braun(4)
(1) School of Earth Sciences, The Ohio State Univ., 125 S. Oval Mall, 275 Mendenhall Lab., Columbus, Ohio 43220, United States
(2) US Geological Survey, , , United States
(3) Dept. of Civil Engineering & Environmental Science, , , Korea
(4) Dept. of Geomatics Engineering, University of Calgary, , Canada
Knowledge of the ice shelf grounding lines and their extent are critical to accurately quantify ice sheet mass balance, and it is well known that the effect of ocean tides could significantly shift the ice shelf grounding lines. Significant amount of West Antarctic ice sheet melt is through the mechanism of basal melting and due to turbulent tidal mixing. In a prior study, we have demonstrated the feasibility of fine spatial scale (as fine as 100 m or less) O1 barotropic ocean tide modeling underneath the Sulzberger ice shelf, West Antarctica, using the VV-polarized C-band ERS-1/-2 tandem mission two-pass SAR interferometry (InSAR) time series. Here we present a study of the use of ALOS/PALSAR data analysis near or on the Filchner-Ronne Ice Shelf and the Antarctic Peninsula. Primarily because of the long repeat orbit of 46 days, it has been difficult to construct interferograms to observe the ocean tidal signals which is aliased temporally due to the ALOS orbital configurations. We report results of a hydrologic study combining L-band polarimetric ALOS/PALSAR and other (C-band) InSAR data, and satellite altimetry for fine-resolution observations of hydrologic storage changes of wetland basins, including example regions of the Louisiana wetlands, USA, and the Helmand river basin and wetlands near the Kajaki and Arghandab dams in Afghanistan.