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Open AccessAbstract

Changes in Net Global Surface Water Area Since 1985

Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, SE-106 91 Stockholm, Sweden
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Presented at TERRAenVISION 2019, Barcelona, Spain, 2–7 September 2019.
Proceedings 2019, 30(1), 69; https://doi.org/10.3390/proceedings2019030069
Published: 21 May 2020
(This article belongs to the Proceedings of TERRAenVISION 2019)
Spatial and temporal characteristics of surface water resources (e.g., extension, connectivity, seasonality) are key elements in water allocation, climate and hydrological regulation, ecosystem functioning, and the food-energy-water nexus. Changes in surface water area due to losses/gains to land could strongly affect these processes on different scales. Previous findings on changes in the Earth’s surface water area are contradictory. Based on water–land year classification datasets, we estimated global surface water area changes between 1985–2000 and 2001–2015. We found a net global gain in surface water of 100,454 km2, attributable to a large net gain in seasonal water (83,329 km2) and a small net gain in permanent water (17,125 km2). In general, net changes were highly heterogeneous in space, with local exceptions of clear drying and wetting trends, e.g., the Aral Sea and Quill Lakes, respectively. These findings raise multiple questions as to why seasonal water gains dominate and how different intertwined drivers (e.g., hydroclimate and human-induced water–land use changes) shape the distribution of the Earth’s surface water. Understanding these long-term changes is essential to predicting water-related pressures and prioritizing management decisions.
Keywords: surface water changes; seasonal water; permanent water; Google Earth Engine surface water changes; seasonal water; permanent water; Google Earth Engine
MDPI and ACS Style

Kalantari, Z.; Borja, S.; Destouni, G. Changes in Net Global Surface Water Area Since 1985. Proceedings 2019, 30, 69.

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