A Global Assessment of Terrestrial Evapotranspiration Increase Due to Surface Water Area Change

Zhan, Shengan; Song, Chunqiao; Wang, Jida; Sheng, Yongwei; Quan, Jiping

doi:10.1029/2018ef001066

Cited by 76 publications

(46 citation statements)

References 160 publications

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“…Depending on the parameterization strategy of a model to capture the process of evaporation at the relevant timescale, different decisions are made to parameterize evaporation. In the past, most studies have focussed on the parameterization of open-water evaporation on weekly or even longer timescales (Finch, 2001;Zhan et al, 2019), where often potential evapotranspiration (PET) is improperly used as a proxy for lake evaporation neglecting heat storage (La, 2015;Duan and Bastiaanssen, 2017). However, parameterizations at the hourly and daily timescales have remained underexplored.…”

Section: Introductionmentioning

confidence: 99%

Evaporation from a large lowland reservoir – (dis)agreement between evaporation models from hourly to decadal timescales

Jansen

Teuling

2020

Hydrol. Earth Syst. Sci.

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Abstract. Accurate monitoring and prediction of surface evaporation become more crucial for adequate water management in a changing climate. Given the distinct differences between characteristics of a land surface and a water body, evaporation from water bodies requires a different parameterization in hydrological models. Here we compare six commonly used evaporation methods that are sensitive to different drivers of evaporation, brought about by a different choice of parameterization. We characterize the (dis)agreement between the methods at various temporal scales ranging from hourly to 10-yearly periods, and we evaluate how this reflects in differences in simulated water losses through evaporation of Lake IJssel in the Netherlands. At smaller timescales the methods correlate less (r=0.72) than at larger timescales (r=0.97). The disagreement at the hourly timescale results in distinct diurnal cycles of simulated evaporation for each method. Although the methods agree more at larger timescales (i.e. yearly and 10-yearly), there are still large differences in the projected evaporation trends, showing a positive trend to a more (i.e. Penman, De Bruin–Keijman, Makkink, and Hargreaves) or lesser extent (i.e. Granger–Hedstrom and FLake). The resulting discrepancy between the methods in simulated water losses of the Lake IJssel region due to evaporation ranges from −4 mm (Granger–Hedstrom) to −94 mm (Penman) between the methods. This difference emphasizes the importance and consequence of the evaporation method selection for water managers in their decision making.

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Section: Introductionmentioning

confidence: 99%

Evaporation from a large lowland reservoir – (dis)agreement between evaporation models from hourly to decadal timescales

Jansen

Teuling

2020

Hydrol. Earth Syst. Sci.

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“…However, few studies have shared the knowledge of how the recent changing lake water surfaces may pose influences on the hydrological and atmospheric processes. A more recent study emphasized the unneglectable influences of changing surface water area on the global water budget with emerging reservoirs and climate-or human-induced area dynamics in natural lakes (Zhan et al, 2019). For most closed lakes in the ITP without outflow, on-lake evaporation is the primary output of lake water balance and acts as a key role in determining long-term water budgets and regional hydrological cycle (Zhou et al, 2015;Song et al, 2015a;Lazhu et al, 2016;Ma et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Impact of amplified evaporation due to lake expansion on the water budget across the inner Tibetan Plateau

Song

Sheng

Zhan

et al. 2019

Intl Journal of Climatology

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Over the past decades, changing climate has exerted pronounced influences on the cryo‐hydrological environment on the Tibetan Plateau. One major manifestation is the widespread lake expansions over Tibetan endorheic basins. The enlarged lake water surface areas are expected to significantly alter land‐atmosphere water fluxes, which in return may pose feedbacks to the climate system and hydrological processes. The goal of this study is to investigate the potential influences of the recent lake expansions on amplifying the evaporation flux over the basins of inner Tibetan Plateau (ITP). We detected that the ITP lakes have experienced a net inundation increase of 4,542.3 km2 during 2000–2015, about 95.6% of which was contributed by lakes larger than 1 km2. We further estimated the land and water evaporations based on multi‐source, available actual evapotranspiration (ETa) and potential evapotranspiration data sets, and in situ evaporation records. The differences between land ETa and lake water evaporation were employed to represent the evaporation alternation over newly inundated basin (named “land‐to‐lake” hereafter) areas. The land ETa was estimated based on the average of three commonly used gridded data sets while the over‐lake evaporation was calculated by the empirical correction of potential evaporation estimates by spatial interpolation of pan evaporation. A conservative estimate using the pan coefficient of 0.6 indicates that the newly inundated lake area may have led to a potential evaporation increase of 3.08 ± 1.08 Gt/year on the ITP. The increased evaporation flux is close to half of the recent annual growth rate of lake water storage in the ITP. Despite unneglectable uncertainties, our estimates initiate an important assessment of how the recent lake expansion across the ITP has influenced the local land‐atmosphere interactions and the water cycle. Accounting this evaporation amplification is crucial to reduce the uncertainty in estimating basin‐scale water budgets and projecting the regional water balance.

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“…Here too climate change plays a role with quantitative predictions of evaporation increasing substantially from Earth's lakes (Wang et al 2018b) and Lake Kinneret (Rimmer et al 2011) due to climate warming -16% and 10-20%, respectively, by the end of the century. In fact, temperature increases are not the only variable relevant to changing open water evaporation-changing lake area (Zhan et al 2019) and wind associated with synoptic weather patterns (Shilo et al 2015) complicate this relationship. However, these quantitative physically based predictions contrast with qualitative attributions suggestingdespite decreases in lake areathat "it is clear that due to increase in temperature, evaporation has increased over the past decades" (Tal 2019b).…”

Section: Water Qualitymentioning

confidence: 99%

Toward strong science to support equitable water sharing in securitized transboundary watersheds

Wine

2019

Biologia

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With unprecedented water scarcity in Earth's water-limited regions, due in large part to continued rapid population growth, peaceable relations among nations are threatened as nations compete with one another for increasingly scarce water resources. This competition occurs against the backdrop of global changean array of multidisciplinary socioeconomic and physical processes that affect water availability. In transboundary basins this multitude of complex uncertain processes often underlain by numerous non-linear, coupled mechanisms controls the amount of water available to be shared among basin riparians and aquatic ecoystems. In this context equitable water sharing and knowledge-based management of besieged aquatic ecosystems demands the strongest possible scientific inference. While transboundary water sharing under non-stationarity has been treated, the impacts of securitization on hydrological process understanding remain largely unknown. However, it is precisely this hydrological process understanding that controls water available for sharing in securitized transboundary basins under non-stationarity. Given the expense involved in solving problems of water scarcity amidst rising population, securitizing state actors may perceive benefit in influencing the hydrologic science literature, including by climatizing increased water scarcity or reduced water quality, even if the true impact is that of a riparian's own water management practices. Indeed, evidence is already emerging of differing hydrologic process understanding in studies impacted by securitization versus those in the broader international literature. Modifying treaties and water sharing agreements to give a neutral third-party arbiter responsibility for resolving contested hydrologic science issues may promote equitable science for the benefit of both aquatic ecosystems and co-riparian states.

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A Global Assessment of Terrestrial Evapotranspiration Increase Due to Surface Water Area Change

Cited by 76 publications

References 160 publications

Evaporation from a large lowland reservoir – (dis)agreement between evaporation models from hourly to decadal timescales

Evaporation from a large lowland reservoir – (dis)agreement between evaporation models from hourly to decadal timescales

Impact of amplified evaporation due to lake expansion on the water budget across the inner Tibetan Plateau

Toward strong science to support equitable water sharing in securitized transboundary watersheds

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