A5022591880- Cryospheric studies and observations
- Hydrology and Watershed Management Studies
- Climate change and permafrost
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Climate variability and models
- Computational Physics and Python Applications
- Rangeland Management and Livestock Ecology
- Transboundary Water Resource Management
- Hydrology and Drought Analysis
- Flood Risk Assessment and Management
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Precipitation Measurement and Analysis
- GNSS positioning and interference
- Urban Heat Island Mitigation
- Tree-ring climate responses
- Water resources management and optimization
- Environmental and Agricultural Sciences
- Meteorological Phenomena and Simulations
- Groundwater and Isotope Geochemistry
- Hydrological Forecasting Using AI
- Solar and Space Plasma Dynamics
- Water Resources and Management
- Research, Science, and Academia
GFZ Helmholtz Centre for Geosciences
2013-2024
Humboldt-Universität zu Berlin
2019
University of Potsdam
2013
University of Stuttgart
2006-2010
Abstract. The Moderate Resolution Imaging Spectroradiometer (MODIS) employed by Terra and Aqua satellites provides spatially snow covered data with 500 m daily temporal resolution. It delivers public domain in raster format. main disadvantage of the MODIS sensor is that it unable to record observations under cloud regions. This why this study focuses on estimating pixel cover for areas where no information available. Our step product involves employing methodology based six successive steps...
This paper investigates the hydro-climatic reasons behind desiccation of Hamun Lakes in Iran-Afghanistan border. We analyzed changes flow Hirmand River (90 percent total inflow to lakes) at international border, and precipitation over this river's sub-basin during 1960–2016 by calculating standardized indices for (SPI) discharge (SDI). applied Normalized Difference Spectral Indices using satellite images from 1987 2021 observe monthly areal change lakes. The results show that major cause is...
Abstract. In data sparse mountainous regions it is difficult to derive areal precipitation estimates. addition, their evaluation by cross validation can be misleading if the gauges are not in representative locations catchment. This study aims at of estimates catchments. particular, first tested whether monthly fields from downscaled reanalysis used for interpolating gauge observations. Secondly, this and other methods evaluated comparing simulated observed discharge, which has advantage...
Abstract This study presents a reconstruction of the seasonal mass balance Glacier No. 354, located in Akshiirak range, Kyrgyzstan, from 2003 to 2014. We use distributed accumulation and temperature-index melt model driven by daily air temperature precipitation nearby meteorological station. The is calibrated with situ measurements annual collected 2011 snow-cover depletion pattern observed using satellite imagery provides additional information on dynamics change throughout melting season....
Abstract. Glacier mass loss is among the clearest indicators of atmospheric warming. The observation these changes one major objectives international climate monitoring strategy developed by Global Climate Observing System (GCOS). Long-term glacier balance measurements are furthermore basis for calibrating and validating models simulating future runoff glacierised catchments. This essential Central Asia, which driest continental regions Northern Hemisphere. In highly populated regions, water...
Abstract. Spatially distributed snow-cover extent can be derived from remote sensing data with good accuracy. However, such are available for recent decades only, after satellite missions proper snow detection capabilities were launched. Yet, longer time series of area usually required, e.g., hydrological model calibration or water availability assessment in the past. We present a methodology to reconstruct historical coverage using recently and long-term point observations depth existing...
Abstract. The study presents a statistically based seasonal precipitation forecast model, which automatically identifies suitable predictors from globally gridded sea surface temperature (SST) and climate variables by means of an extensive data-mining procedure explicitly avoids the utilization typical large-scale indices. This leads to enhanced flexibility model enables its automatic calibration for any target area without prior assumption concerning adequate predictor variables. Potential...
During the past three decades, sea water level (SWL) in Caspian Sea has declined by about 2 m and area decreased 15 000 km2. This affected coastal communities, environment economically important gulfs of (e.g. Dead Kultuk). To assess effects coastline change evaluate zones vulnerable to desiccation, we simulated SWL using total inflow from feeder rivers precipitation evaporation over sea. We determined potential areas 80 years comparing minimum maximum annual body maps (for 1977 1995). then...
Political tensions over water management in the Central Asia region have intensified since Soviet era, as ecological issues like drying Aral Sea and seasonal hydropower disruptions impact downstream countries. The paper discusses region’s governance challenges, including climate-induced uncertainties, resource demands, limited capacity of local research institutions. While Asia’s governments initiated reforms, new infrastructure agreements, resilience remains underdeveloped. also explores...
The cryosphere plays a critical role in Central Asia, particularly terms of water availability for agriculture and energy production via hydropower stations. Glaciers serve as essential sources both seasonal long-term supply, while snow storage mountainous regions significantly influences availability. Consequently, the accurate estimation resources stored glaciers is vital effective management transboundary resources. However, limitations data pose significant challenges to comprehensive...
In our study, we focused on the Panj River basin, located in Eastern Pamirs, a region characterized by extreme climatic conditions, low air temperatures, minimal precipitation, extensive permafrost, seasonal snow cover and graciarization. The River, one of Tajikistan's primary rivers, is left tributary Amu Darya, formed confluence Vakhandarya Pamir rivers. Its estuary lies southeastern Tajikistan.In river, reserves significantly influence timing glacier melt determines water availability...
Central Asian countries depend highly on water resources from snow and glacier melt, which has to be studied thoroughly estimate availability. However, the observation network in Asia is poor carry out such studies detail. Observations space using remote sensing techniques might fill this gap, needs validated. Therefore, study evaluates Moderate Resolution Imaging Spectroradiometer (MODIS) daily cover product Asia. For evaluation, situ depth data 30 meteorological stations higher resolution...
Abstract This study refines the method for calibrating a glacio‐hydrological model based on Hydrograph Partitioning Curves (HPCs), and evaluates its value in comparison to multidata set optimization approaches which use glacier mass balance, satellite snow cover images, discharge. The HPCs are extracted from observed flow hydrograph using catchment precipitation temperature gradients. They indicate periods when various runoff processes, such as melt or melt, dominate basin hydrograph. annual...
Abstract Discharge as an integrated representation of all hydrological processes is the most common response variable used in sensitivity analyses. However, due to overlaying effects processes, signal certain parameters discharge can be masked. A more informative form analysis achieved by investigating how parameter sensitivities are related individual modeled components. In our study, TEDPAS (TEmporal Dynamics PArameter Sensitivity) methodology calculate daily components and detect temporal...
Abstract. The semi-arid regions of Central Asia crucially depend on the water resources supplied by mountainous areas Tien Shan and Pamir Altai mountains. During summer months snow-melt- glacier-melt-dominated river discharge originating in mountains provides main resource available for agricultural production, but also storage reservoirs energy generation during winter months. Thus a reliable seasonal forecast is crucial sustainable management planning resources. In fact, forecasts are...
Abstract. Tracer data have been successfully used for hydrograph separation in glacierized basins. However, these basins uncertainties of the are large and caused by spatiotemporal variability tracer signatures water sources, uncertainty sampling, mixing model uncertainty. In this study, we electrical conductivity (EC) measurements two isotope (δ18O δ2H) to label runoff components, including groundwater, snow glacier meltwater, rainfall, a Central Asian basin. The contributions components...
Central Asia is characterized by a continental climate and pronounced inter-annual variability of precipitation discharge. In the past, hydro-climatological droughts led to serious water shortages, resulting in crop shortfalls, significant economic loss inter-state political tensions. Robust forecasts anomalous climatic hydrological conditions may reduce regional vulnerability hydro-climatic extremes thus can serve as scientific basis for national trans-national management. Based on...
Abstract. Long-term monitoring of water resources and climate parameters at the scale river basins requires networks continuously operated in-situ stations. Since 2009, GFZ CAIAG, in cooperation with National Hydrometeorological Services (NHMS) Central Asia, are establishing such a regional network Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, lately Afghanistan to collect observations meteorological hydrological deliver them end-users for operational tasks scientific studies. The newly...