@article{c6a0b18dc09c4fef99147c80418e4bd8,
title = "On the Performance of Sentinel-3 Altimetry Over New Reservoirs: Approaches to Determine Onboard A Priori Elevation",
abstract = "Satellite radar altimetry has become an important data source supplementing in situ water level. For practical reasons, a radar altimeter can only record reflected echoes within its range window. Therefore, water surface elevation must fall within the range window. To this end, the Sentinel-3 radar altimetry mission is configured with a new tracking function (i.e., open loop) to position its range window based on an onboard a priori elevation of ground targets. We found that Sentinel-3 is unable to observe recently built reservoirs due to the incorrect onboard elevations. To overcome this issue, four approaches are proposed to improve the a priori elevation for inland water bodies, particularly reservoirs. These approaches can significantly increase data availability of Sentinel-3 over reservoirs and can be used to prepare the onboard elevations of reservoirs and lakes for future missions such as Sentinel-6, Sentinel-3C/-3D, and the Surface Water and Ocean Topography (SWOT) mission.",
keywords = "data acquisition, inland water, open-loop tracking, radar altimetry, reservoir, water surface elevation",
author = "Xingxing Zhang and Liguang Jiang and Kittel, {C{\'e}cile M.M.} and Zhijun Yao and Karina Nielsen and Zhaofei Liu and Rui Wang and Jun Liu and Andersen, {Ole B.} and Peter Bauer-Gottwein",
note = "Funding Information: This work is jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA20060202), the Innovation Fund Denmark (Innovationsfonden) (File: 8087‐00002B), and the Danida Fellowship Centre (File: 18‐M01‐DTU) Xingxing Zhang is financially supported by the Chinese Scholarship Council, which is greatly acknowledged. We would like to thank Denis Blumstein for providing material on OLTC. Thanks also go to Editor Mathieu Morlighem and two anonymous reviewers whose comments helped improve the manuscript. Funding Information: This work is jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA20060202), the Innovation Fund Denmark (Innovationsfonden) (File: 8087-00002B), and the Danida Fellowship Centre (File: 18-M01-DTU) Xingxing Zhang is financially supported by the Chinese Scholarship Council, which is greatly acknowledged. We would like to thank Denis Blumstein for providing material on OLTC. Thanks also go to Editor Mathieu Morlighem and two anonymous reviewers whose comments helped improve the manuscript. Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved.",
year = "2020",
doi = "10.1029/2020GL088770",
language = "English",
volume = "47",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "17",
}