Modern hydro-biological state of the Small Aral sea

Aladin, N. V.; Crétaux, Jean-François; Плотников, И. С.; Kouraev, Alexei V.; Smurov, A. O.; Cazenave, Aanny; Egorov, A. N.; Papa, Fabrice

doi:10.1002/env.709

Cited by 54 publications

(39 citation statements)

References 13 publications

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“…Validation was performed over the Aral Sea in Central Asia using previous results obtained in [38,39]. Variations in height, surface and volume of the Aral Sea were calculated for 1992 to 2005, with a combination of altimetry data from Topex/Poseidon and Jason satellites, and a digitized bathymetry map of the lake's basin.…”

Section: Methodology To Detect Water Over the Ind With Modis And Valimentioning

confidence: 99%

Inundations in the Inner Niger Delta: Monitoring and Analysis Using MODIS and Global Precipitation Datasets

Bergé-Nguyen

Crétaux

2015

Remote Sensing

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A method of wetland mapping and flood survey based on satellite optical imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra instrument was used over the Inner Niger Delta (IND) from 2000-2013. It has allowed us to describe the phenomenon of inundations in the delta and to decompose the flooded areas in the IND into open water and mixture of water and dry land, and that aquatic vegetation is separated from bare soil and "dry" vegetation. An Empirical Orthogonal Function (EOF) analysis of the MODIS data and precipitation rates from a global gridded data set is carried out. Connections between flood sequence and precipitation patterns from the upstream part of the Niger and Bani river watersheds up to the IND are studied. We have shown that inter-annual variability of flood dominates over the IND and we have estimated that the surface extent of open water varies by a factor of four between dry and wet years. We finally observed an increase in vegetation over the 14 years of study and a slight decrease of open water.

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Section: Methodology To Detect Water Over the Ind With Modis And Valimentioning

confidence: 99%

Inundations in the Inner Niger Delta: Monitoring and Analysis Using MODIS and Global Precipitation Datasets

Bergé-Nguyen

Crétaux

2015

Remote Sensing

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“…Some basins in the study of Dai and Trenberth (2002) have an area large enough to be included in the 35 world's largest river basins, but show too little discharge to be listed in the study of Dai and Trenberth (2002). Discharge data for these basins are derived from additional sources Aladin et al, 2005;Meshcherskaya and Golod, 2003). A list of the rivers as well as a map with the associated catchments is given in Appendix A3.…”

Section: Data Sourcesmentioning

confidence: 99%

“…River basins used for model evaluation. Data is taken mostly from Vorosmarty et al (2000) and Dai and Trenberth (2002), with additional data taken from , , Aladin et al (2005), and Meshcherskaya and Golod (2003 …”

Section: Appendix a A1 Thermodynamic Limitsmentioning

confidence: 99%

Estimates of the climatological land surface energy and water balance derived from maximum convective power

Kleidon

Renner

Porada

2014

Hydrol. Earth Syst. Sci.

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Abstract. The land surface energy and water balances are tightly coupled by the partitioning of absorbed solar radiation into terrestrial radiation and the turbulent fluxes of sensible and latent heat, as well as the partitioning of precipitation into evaporation and runoff. Evaporation forms the critical link between these two balances. Its rate is strongly affected by turbulent exchange as it provides the means to efficiently exchange moisture between the heated, moist surface and the cooled, dry atmosphere. Here, we use the constraint that this mass exchange operates at the thermodynamic limit of maximum power to derive analytical expressions for the partitioning of the surface energy and water balances on land. We use satellite-derived forcing of absorbed solar radiation, surface temperature and precipitation to derive simple spatial estimates for the annual mean fluxes of sensible and latent heat and evaluate these estimates with the ERA-Interim reanalysis data set and observations of the discharge of large river basins. Given the extremely simple approach, we find that our estimates explain the climatic mean variations in net radiation, evaporation, and river discharge reasonably well. We conclude that our analytical, minimum approach provides adequate first order estimates of the surface energy and water balance on land and that the thermodynamic limit of maximum power provides a useful closure assumption to constrain the energy partitioning at the land surface.

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“…Since then, many studies have illustrated certain case studies using satellite altimetry for lake surveys (Birkett et al 1999;Aladin et al 2005;Coe and Birkett 2005;Hwang et al 2005;Medina et al 2008;Lee et al 2011;Singh et al 2012;Kleinherenbrink et al 2015 and many others). The information obtained by this technique is the average water level above a reference surface for a set of lakes once they are overpassed by the satellite.…”

Section: Introductionmentioning

confidence: 99%

Lake Volume Monitoring from Space

Crétaux¹,

et al. 2016

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Lakes are integrators of environmental change occurring at both the regional and global scale. They present a wide range of behavior on a variety of timescales (cyclic and secular) depending on their morphology and climate conditions. Lakes play a crucial role in retaining and stocking water, and because of the significant global environmental changes occurring at several anthropocentric levels, the necessity to monitor all morphodynamic characteristics [e.g., water level, surface (water contour) and volume] has increased substantially. Satellite altimetry and imagery are now widely used together to calculate lake and reservoir water storage changes worldwide. However, strategies and algorithms to calculate these characteristics are not straightforward, and specific approaches need to be developed. We present a review of some of these methodologies by using lakes over the Tibetan Plateau to illustrate some critical aspects and issues (technical and scientific) linked to the observation of climate change impact on surface waters from remote sensing data. Many authors have measured water variation using the limited remote sensing measurements available over short time periods, even though the time series are probably too short to directly link these results with climate change. Indeed, there are many processes and factors, like the influence of lake morphology, that are beyond observation and are still uncertain. The time response for lakes to reach a new state of equilibrium is a key aspect that is often neglected in current literature. Observations over a long period of time, including maintaining a constellation of comprehensive and complementary satellite missions with service continuity over decades, are therefore necessary especially when the ground gauge network is too limited. In addition, the design of future satellite missions with new instrumental concepts (e.g., SAR, SARin, Ka band altimetry, Ka interferometry) will also be suitable for complete monitoring of continental waters.

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Modern hydro-biological state of the Small Aral sea

Cited by 54 publications

References 13 publications

Inundations in the Inner Niger Delta: Monitoring and Analysis Using MODIS and Global Precipitation Datasets

Inundations in the Inner Niger Delta: Monitoring and Analysis Using MODIS and Global Precipitation Datasets

Estimates of the climatological land surface energy and water balance derived from maximum convective power

Lake Volume Monitoring from Space

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