A5007318963- Soil Moisture and Remote Sensing
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Climate change and permafrost
- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Meteorological Phenomena and Simulations
- Climate variability and models
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Soil Geostatistics and Mapping
- Hydrology and Drought Analysis
- Landslides and related hazards
- Urban Heat Island Mitigation
- Arctic and Antarctic ice dynamics
- Icing and De-icing Technologies
- Species Distribution and Climate Change
- Winter Sports Injuries and Performance
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Rangeland Management and Livestock Ecology
- Tropical and Extratropical Cyclones Research
- Climate change impacts on agriculture
- Remote Sensing and Land Use
- Urban Stormwater Management Solutions
- Land Use and Ecosystem Services
City College of New York
2014-2025
NOAA Center for Earth System Sciences and Remote Sensing Technologies
2022-2023
National Oceanic and Atmospheric Administration
2004-2023
City University of New York
2010-2022
City College
2021
The Graduate Center, CUNY
2006-2017
Center For Remote Sensing (United States)
2009-2017
University of Puerto Rico System
2015
Colorado State University
2013
Landslides, floods, and droughts are recurring natural disasters in Nepal related to too much or little water. The summer monsoon contributes more than 80% of annual rainfall, rainfall spatial inter-annual variation is very high. Gandaki River, one the three major rivers tributaries Ganges covers all agro-ecological zones central part Nepal. Time series tests were applied for different River Basin (GRB) trends four seasons (pre-monsoon, monsoon, post-monsoon winter) from 1981 2012....
This paper presents temporal and spatial pattern of drought phenomena in central Nepal using standardized precipitation index (SPI) at multiple time scales. The study is based on 32 years monthly data from 40 meteorological stations 1981 to 2012. Results indicate that, while there no distinct trend regional precipitation, interannual variation large. Trend analysis shows that most are characterized by increases both severity frequency stronger for longer Over the period, summer season 2004,...
Abstract. Vegetation optical depth (VOD) retrieved from microwave radiometry correlates with the total amount of water in vegetation, based on theoretical and empirical evidence. Because vegetation varies relative content (as well as biomass), this correlation further suggests a possible relationship between VOD plant potential, quantity that drives hydraulic behavior. Previous studies have found evidence for scale satellite pixels tens kilometers across, but these comparisons suffer...
Precipitation in mountain regions is often highly variable and poorly observed, limiting abilities to manage water resource challenges. Here, we evaluate remote sensing ground station-based gridded precipitation products over Nepal against weather station observations on a monthly timescale. We find that the Tropical Rainfall Measuring Mission (TRMM) 3B-43 product exhibits little mean bias reasonable skill giving Nepal. Compared observations, TRMM showed an overall Nash-Sutcliffe efficiency...
Nepal has an extreme altitudinal range from 60–8850 m with heterogeneous topography and distinct climatic zones. The country is considered a biodiversity hotspot, nearly quarter of the land area located in protected areas. surrounding Himalayan region are particularly vulnerable to climate change because their abrupt ecological transitions. Tens millions people rely on region’s ecosystem services, observed modeled warming trends predict increased extremes Himalayas. To study impacts inform...
This paper describes Nepal’s national livestock policies and considers how they can be improved to help meet the pressing challenges of economic development, equity, poverty alleviation, gender mainstreaming, inclusion marginalized underprivileged communities, climate vulnerability. Nepal is in process transforming its government from a unitary system federal democratic structure through new constitution expected by 2015, offering opportunity bring set priorities stakeholders policymaking....
Global change affects vegetation cover and processes through multiple pathways. Long time series of surface land properties derived from satellite remote sensing give unique abilities to observe these changes, particularly in areas with complex topography limited research infrastructure. Here, we focus on Nepal, a biodiversity hotspot where productivity is by moisture availability (dominated summer monsoon) at lower elevations temperature high elevations. We analyze the normalized difference...
A large population relies on water input to the Indus basin, yet basinwide precipitation amounts and trends are not well quantified. Gridded data sets covering different time periods based either station observations, satellite remote sensing, or reanalysis were compared with available observations analyzed for trends. Compared some tended greatly underestimate precipitation, while others overestimate it. Additionally, discrepancies between set showed significant in many cases, suggesting...
Spatial and temporal soil moisture dynamics are critically needed to improve the parameterization for hydrological meteorological modeling processes. This study evaluates statistical spatial structure of large-scale observed simulated estimates under pre- post-precipitation event conditions. large scale variability is a crucial in calibration validation satellite based data assimilation systems. analysis using geostatistical approaches was used validate modeled by Agriculture Meteorological...
Satellite remote sensing observations have the potential for efficient and reliable mapping of spatial soil moisture distributions. However, retrievals from active microwave data are typically complex due to inherent difficulty in characterizing interactions among land surface parameters that contribute retrieval process. Therefore, adequate physical mathematical descriptions backscatter interaction with such as cover, vegetation density, characteristics not readily available. In condition,...
Abstract The objective of this work is to demonstrate the potential using passive microwave data monitor flood and discharge conditions infer watershed hydraulic hydrologic parameters. case study major in Iowa summer 2008. A new Polarisation Ratio Variation Index (PRVI) was developed based on a multi‐temporal analysis 37 GHz satellite imagery from Advanced Microwave Scanning Radiometer (AMSR‐E) calculate detect anomalies soil moisture and/or inundated areas. Robust Satellite Technique (RST)...
In this study, daily maps of snow cover distribution and sea ice extent produced by NOAA’s interactive multisensor mapping system (IMS) were validated using in situ depth data from observing stations obtained National Climatic Data Center (NCDC) for calendar years 2006 to 2010. IMS provides within the Northern Hemisphere combination geostationary polar orbiting satellites visible, infrared microwave spectrums. Statistical correspondence between point measurements has been evaluated assuming...
Improved irrigation use efficiency is an important tool for intensifying and diversifying agriculture in Nepal, resulting higher economic yield from irrigated farmlands with a minimum input of water. Research was conducted to evaluate the effect method (furrow vs. drip) on productivity nutritious fodder species during off-monsoon dry periods different elevation zones central Nepal. A split-block factorial design used. The factors considered were treatment location, crop, method. Commonly...
This study addresses the issue of variability and heterogeneity problems that are expected from a sensor with larger footprint having homogenous heterogeneous sub-pixels. Improved understanding spatial soil surface characteristics such as land cover vegetation in critical remote sensing based moisture retrieval. analyzes sub-pixel (standard deviation sub-grid pixels) Normalized Difference Vegetation Index SAR backscatter. Back-propagation neural network was used for retrieval active...
This study analyzes daily temperature and precipitation data collected from 44 weather stations throughout New York, Jersey, Connecticut to assess quantify the historical climatic changes within these states. The conducts a detailed examination of spatial temporal trends, focusing on specific that best represent diversity each area. A critical analysis aspect involves comparing trends in urban suburban areas, mainly York City. findings reveal significant upward increasing trend average...
A field experiment was performed in a grassland at the NOAA‐CREST–Soil Moisture Advanced Radiometric Testbed (CREST‐SMART) facility, which includes mobile L‐band dual‐polarized radiometer with an situ soil temperature and moisture observation network, located near Millbrook, NY. During day‐long campaign, intensive spatiotemporal measurements of brightness temperatures, surface temperature, moisture, 3‐, 7‐, 12‐cm depths were collected during three passes 0830, 1130, 1430 h. second third...
The Northeast United States is a generally wet region that has had substantial increases in mean precipitation over the past decades, but also experiences damaging droughts. We evaluated drought frequency, intensity, and duration trends period 1901–2015. used dataset of Standardized Precipitation Evapotranspiration Index (SPEI), measure water balance based on meteorology computed at multiple timescales. It was found frequency droughts decreased this period, their average intensity did not...
The goal of this study is to assess the temporal variability performance Soil Moisture Active Passive, SMAP, soil moisture retrievals throughout seasons as surface conditions change. In-situ observations from a network deployed in Millbrook, New York, between 2019 and 2021 are used. comprises 25 stations distributed across 33-km SMAP pixel with predominantly forest land cover. in-situ were collected 6 7 a.m., local time. This article covers assessment accuracy by incorporating various...
Abstract National Oceanic and Atmospheric Administration's Weather Service ( NWS ) flash flood warnings are issued by Forecast Offices underpinned information from the Flash Flood Guidance FFG system operated River Centers RFC s). This study focuses on quantitative evaluation limitations of using reported cases in 2010 2011. The reports were obtained Storm Event database for Arkansas‐Red Basin ABRFC ). current at provides gridded guidance GFFG Hydrology Laboratory‐Research Distributed...
Soil moisture is placed at the interface between land and atmosphere which influences water energy flux. However, soil information has a significant importance in hydrological modelling environmental processes. Recent advances acquiring from satellite its effective utilization provide an alternative to conventional methods. In this study, attempt made apply physically based, distributed-parameter, Water Assessment Tool (SWAT) validate Advanced Microwave Scanning Radiometer (AMSR2) parts of...