English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Accurate quantification of evaporation ( E0 ) from open water is vital inarid regions for water resource management and planning, especially for lakesin the desert. The scintillometers are increasingly recognized by researchersfor their ability to determine sensible ( H ) and latent heat fluxes (LE)accurately over distances of hundreds of meters to several kilometers, thoughscintillometers are mainly used to monitor the land surface processes. Inthis paper, it is installed on both sides of the shore over a lake. Comparedto the data of evaporationpan, the scintillometer was successfully applied toSumu Barun Jaran in Badain Jaran Desert using the classical method and theproposed linearized β method. Due to the difficulty in measuring watersurface temperature and the easiness to monitor the water temperature atdifferent depths, it is worth thinking that if is feasible to utilize theshallow water temperature instead of the water surface temperature and howmuch errors it will cause. Water temperature at 10 and 20 cm depths wereused to replace the lakewater surface temperature in the two methods toanalyze the changes of sensible and latent heat fluxes in hot and coldseasons at halfhour time scales. Based on the classical method, the values of H were almost barely affected, and the average value of LE using watertemperature at 20 cm depth is 0.8–9.5 % smaller than that at 10 cmdepth in cold seasons. In hot seasons, compared to the results at 10 cmdepth, the average value of H increased by 20–30 %, and LE decreasedby about 20 % at 20 cm depth. In the proposed linearized β methodof scintillometer, only the slope of the saturation pressure curve ( Δ )is related to the water surface temperature, which was estimated usingavailable equations of saturated vapor pressure versus temperature of theair. Compared to the values of estimated by the air temperature, while thewater surface temperature are replaced by water temperature at 10 and 20 cmdepths, in different seasons, the errors of 2–25 % in Δ werecaused. Thus was calculated by the original equation in the proposedlinearized β method of scintillometer. Interestingly, the watertemperature at 10 and 20 cm depths had little effect on H , LE ( E0 ) indifferent seasons. The reason is that the drying power of the air( EA ) accounted for about 85 % of the evaporation (i.e. thechanges of Δ have only about 3 % impact on evaporation), whichindicated that the driving force from unsaturated to saturated vapor pressureat 2 m height (i.e. the aerodynamic portion) has the main role onevaporation. Therefore, the proposed linearized β method ofscintillometer is recommended to quantify the H , LE ( E0 ) over openwater, especially when the water surface temperature cannot be accuratelymeasured.

Estimating lake-water evaporation from data of large-aperture scintillometer in the Badain Jaran Desert, China, with two comparable methods