A5023014710- Cryospheric studies and observations
- Climate change and permafrost
- Soil Moisture and Remote Sensing
- Climate variability and models
- Arctic and Antarctic ice dynamics
- Hydrology and Drought Analysis
- Hydrology and Watershed Management Studies
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Meteorological Phenomena and Simulations
- Flood Risk Assessment and Management
- Precipitation Measurement and Analysis
- Plant Water Relations and Carbon Dynamics
- Geographic Information Systems Studies
- Advanced Computational Techniques and Applications
- Geophysics and Gravity Measurements
- Soil Geostatistics and Mapping
- Scientific Research and Discoveries
University of Maryland, College Park
2018-2024
Goddard Space Flight Center
2018-2024
Earth System Science Interdisciplinary Center
2018-2024
University of Mary
2018
University of California, Los Angeles
2018
Abstract. Seasonal snow cover is the largest single component of cryosphere in areal extent, covering an average 46 × 106 km2 Earth's surface (31 % land area) each year, and thus important expression driver climate. In recent years, Northern Hemisphere spring has been declining at about same rate (∼ −13 per decade) as Arctic summer sea ice. More than one-sixth world's population relies on seasonal snowpack glaciers for a water supply that likely to decrease this century. Snow also critical...
Abstract. The effective applications of land surface models (LSMs) and hydrologic pose a varied set data input processing needs, ranging from ensuring consistency checks to more derived analytics. This article describes the development Land Data Toolkit (LDT), which is an integrated framework designed specifically for execute LSMs hydrological models. LDT not only serves as preprocessor NASA Information System (LIS), multi-model LSM simulations assimilation (DA) integrations, but also...
Abstract Many regions in Africa and the Middle East are vulnerable to drought water food insecurity, motivating agency efforts such as U.S. Agency for International Development’s (USAID) Famine Early Warning Systems Network (FEWS NET) provide early warning of events region. Each year these warnings guide life-saving assistance that reaches millions people. A new NASA multimodel, remote sensing–based hydrological forecasting analysis system, NHyFAS, has been developed support by improving...
Abstract. The Middle East and North Africa (MENA) region has experienced more frequent severe drought events in recent decades, leading to increasingly pressing concerns over already strained food water security. An effective monitoring early warning system is thus critical support risk mitigation management by countries the region. Here we investigate potential for assimilation of leaf area index (LAI) soil moisture observations improve representation overall hydrological carbon cycles an...
Abstract Prior soil moisture data assimilation (DA) efforts to incorporate human management features such as agricultural irrigation has only shown limited success. This is partly due the fact that observational rescaling approaches for bias correction used in DA systems are less effective when unmodeled processes dominant source of systematic biases. In this article, we demonstrate an alternative approach, i.e. anomaly overcoming limitation. Unlike approaches, proposed method does not scale...
This study investigates the potential differences between spatial and temporal transferability of Hydrologiska Byråns Vattenbalansavdelning (HBV) rainfall-runoff model parameters in 576 Iranian catchments. Our goal is to determine how parameter affected by (a) transfer modes (temporal or spatial) (b) different climate conditions. In mode, we make decisions each catchment based on a benchmark baseline that accounts for seasonality flows. examine physical similarity proximity methods. The main...
Abstract Estimating the Greenland ice sheet surface mass balance (SMB) is an important component of current and future projections sea level rise. Given lack in situ information, imperfect models, underutilized remote sensing data, it critical to combine available observations with a physically based model better characterize spatial temporal variation SMB. This work proposes data assimilation framework that yields SMB estimates benefit from state‐of‐the‐art snowpack (Crocus) 16‐day albedo...
Abstract. Seasonal snow cover is the largest single component of cryosphere in areal extent, covering an average 46 million square km Earth's surface (31 % land area) each year, and thus important expression driver Earth’s climate. In recent years, Northern Hemisphere spring has been declining at about same rate (~ −13 %/decade) as Arctic summer sea ice. More than one-sixth world’s population relies on seasonal snowpack glaciers for a water supply that likely to decrease this century. Snow...
Abstract. The effective applications of land surface model (LSM) and hydrologic models pose a varied set data input processing needs, ranging from ensuring consistency checks to more derived analytics. This article describes the development Land Data Toolkit (LDT), which is an integrated framework designed specifically for execute LSMs hydrological models. LDT not only serves as pre-processor NASA Information System (LIS), multi-model LSM simulations assimilation (DA) integrations, but also...
Abstract. The Middle East and North Africa (MENA) region has experienced more frequent severe drought events in recent decades, leading to increasingly pressing concerns over already strained food water security. An effective monitoring early warning system is thus critical support risk mitigation management by countries the region. Here we investigate potential for assimilation of leaf area index (LAI) soil moisture observations improve representation overall hydrological carbon cycles an...
Abstract Accurate estimation of snow accumulation and melt is a critical part decision‐making in snow‐dominated watersheds. In this study, we demonstrate flexible methodology to couple detailed model, Crocus, separately two different land surface models (LSMs), Noah‐MP Noah. The original LSMs the coupled (Noah‐MP‐Crocus Noah‐Crocus) are used simulate depth, water equivalent, other energy states fluxes. results simulations compared against wide range independent gridded point scale reference...
Abstract Accurate estimates of surface mass balance over the Greenland ice sheet (GrIS) would contribute to understanding cause recent changes and help better estimate future contribution GrIS sea‐level rise. Given limitations in‐situ measurements, modeling, remote sensing, it is critical explore opportunity merge available data characterize spatial temporal variation (SMB). This work utilizes a particle batch smoother assimilation technique that yields SMB benefit from snow model Crocus...
Earth and Space Science Open Archive This work has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Reanalysis Surface Mass Balance Greenland Ice Sheet along K-transect (2000-2014)AuthorsMahdiNavariiDSteven AMargulisMarcoTedescoiDXavierFettweisiDRoderik S. W.van de...
Prior studies have shown that models and remote sensing data cannot accurately estimate snow emissivity due to limitations attributed each of them. Hence, in this study, we merged Common Land Model (CLM) emission (MEMLS) with multi-frequency passive microwave within an EnBS scheme emissivity. Its feasibility was tested via a test where (at 1.4, 18.7, 36.5, 87 GHz) measurements at the point scale were individually simultaneously assimilated The contribution channel estimating true is examined...