期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2020
卷号：117
期号：12
页码：6310-6311
DOI：10.1073/pnas.1922868117
出版社：The National Academy of Sciences of the United States of America
摘要：Zhang et al. (1) raise concerns over the characteristics and change of surface water bodies (WBs) in China reported in our article in PNAS (2). We believe these concerns are not well grounded. The dynamic nature of WBs results in a constant change in their number and extent over large land areas. Therefore, it is important to define a temporal window from whence the WB calculations are referenced, as Zhang et al. (1) highlight. Feng et al. (2) reference previous studies that relied on satellite snapshots acquired at one, or a few, points in time to study WBs across China. These studies, while useful for characterizing WB conditions at the specific points in time, could not accurately estimate the maximum extent.
