A5009504125- Plant Water Relations and Carbon Dynamics
- Climate variability and models
- Tree-ring climate responses
- Remote Sensing in Agriculture
- Cryospheric studies and observations
- Hydrology and Drought Analysis
- Landslides and related hazards
- Hydrology and Watershed Management Studies
- Geology and Paleoclimatology Research
- Global Health Care Issues
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Precipitation Measurement and Analysis
- Water-Energy-Food Nexus Studies
- Transboundary Water Resource Management
- Atmospheric aerosols and clouds
- Ecosystem dynamics and resilience
- Aquatic Ecosystems and Phytoplankton Dynamics
- Greenhouse Technology and Climate Control
- Biocrusts and Microbial Ecology
- Climate change and permafrost
- Plant responses to elevated CO2
- Migration and Labor Dynamics
- Energy and Environment Impacts
- Forest ecology and management
Northern Arizona University
2024-2025
University of Arizona
2019-2024
Sharif University of Technology
2020
Abstract Precipitation is a critical variable to monitor and predict meteorological drought. The WMO recommended standardized precipitation index (SPI) calculated from gauge (i.e. GPCC), satellite-gauge (GPCP, CHIRPS), reanalysis ERA-Interim, MERRA-2), satellite-gauge-reanalysis MSWEP) over the global domain. Measured differences among datasets include metrics such as percent area under drought, number of drought events, spread correlation in success capturing moderate severe-exceptional...
Abstract Dust storms are common meteorological events in arid and semi-arid regions, particularly Southwest Iran (SWI). Here we study the relation between drought Iraq dust SWI 2003 2018. The HYSPLIT model showed that central southern main sources for SWI. Mean annual aerosol optical depth (AOD) analysis demonstrated 2008 2009 were dustiest years since there is an increased frequency of summertime extreme 2009. Standardized Precipitation Evapotranspiration Index revealed significantly...
Wildfire is a major concern worldwide and particularly in Australia. The 2019–2020 wildfires Australia became historically significant as they were widespread extremely severe. Linking climate vegetation settings to can provide insightful information for wildfire prediction, help better understand behavior the future. goal of this research was examine relationship between recent wildfires, various hydroclimatological variables, satellite-retrieved indices. analyses performed here show...
At a recent “bake-off,” researchers judged thermal infrared cameras and developed guidelines for their consistent use in studying vegetation temperatures, which illuminate vital ecosystem processes.
Abstract. Vegetation phenology plays a significant role in driving seasonal patterns land-atmosphere interactions and ecosystem productivity, is key factor to consider when modeling or investigating ecological land-surface dynamics. To integrate research ultimately requires the application of carefully curated quality controlled phenological datasets that span multiple years include wide range different ecosystems plant functional types. By using digital cameras record images canopies every...
Evapotranspiration is one of the main components water and energy balance. In this study, we compare two ET products, suitable for regional analysis at high spatial resolution: The recent WaPOR product developed by FAO METRIC algorithm. based on ETLook, which a two-source model relies microwave images. unique as it has no limitation under cloudy days, but limited clouds. are more sensitive to land surface temperature soil moisture, respectively. Using years (2010 2014) data over Lake Urmia...
Irrigated croplands require large annual water inputs and are critical to global food production. Actual evapotranspiration (AET) is a main index of use in croplands, several remote-sensing products have been developed quantify AET at the scale. In this study, we estimate trends actual AET, potential ET (PET), precipitation rate (PP) utilizing MODIS Evapotranspiration product (2001–2018) within Google Earth Engine cloud-computing environment. We then introduce new based on combination PET,...
Plant canopy temperature (Tc) is partly regulated by evaporation and transpiration from the surface can be used to infer changes in stomatal regulation vegetation water stress. In this study, we a thermal Unmanned Aircraft Systems conjunction with eddy covariance, sap flow, spectral reflectance data assess diurnal characteristics of Tc stress status over semiarid mixed conifer forest Arizona, USA. Diurnal dynamics were closely related tree flow associated regulation. Consistent previously...
Abstract Air pollution has become an important national issue in Iran recent years. Several studies have shown that air harmfully impacts the physical and mental health of citizens, reducing labor productivity student academic performance. One aspect is yet to be examined if it explains migration behavior across provinces Iran. Between 2011 2016, approximately 4.3 million Iranians (about 5% population) left their habitual residences moved new locations (mostly within borders Iran). The...
Water management in arid basins often lacks sufficient hydro-climatological data because, e.g., rain gauges are typically absent at high elevations and inflow to ungauged areas around large closed lakes is difficult estimate. We sought improve precipitation runoff estimation an basin (Lake Urmia, Iran) using methods involving assimilation of satellite-based data. estimated interpolation gauge by kriging, downscaling the Tropical Rainfall Measuring Mission (TRMM), cokriging in-situ records...
Summary Drylands of the southwestern United States are rapidly warming, and rainfall is becoming less frequent more intense, with major yet poorly understood implications for ecosystem structure function. Thermography‐based estimates plant temperature can be integrated air to infer changes in physiology response climate change. However, very few studies have evaluated dynamics at high spatiotemporal resolution pulse‐driven dryland ecosystems. We address this gap by incorporating...
Abstract Understanding tree transpiration variability is vital for assessing ecosystem water‐use efficiency and forest health amid climate change, yet most landscape‐level measurements do not differentiate individual trees. Using canopy temperature data from thermal cameras, we estimated the rates of trees at Harvard Forest Niwot Ridge. PT‐JPL model was used to derive latent heat flux images canopy‐level, showing strong agreement with tower ( R 2 = 0.70–0.96 Niwot, 0.59–0.78 half‐hourly...
Abstract The Arctic and Boreal Region (ABR) is subject to extensive land cover change (LCC) due elements such as wildfire, permafrost thaw, shrubification. natural anthropogenic ecosystem transitions (i.e. LCC) alter key characteristics including surface temperature (LST), albedo, evapotranspiration (ET). These biophysical variables are important in controlling energy balance, water exchange, carbon uptake which factors influencing the warming trend over ABR. However, what extent these...
The purpose of this study is to examine the impact air pollution (measured by satellite data Aerosol Optical Depth (AOD)) on net outmigration. Using from 2011 and 2016 National Population Housing Censuses for 31 provinces Iran applying a panel fixed effects estimation method, our results show that AOD has positive significant We also find higher levels economic activities in discourage
Abstract Biological soil crusts (biocrusts) are widespread photosynthetic communities covering about 12% of Earth's land surface, and play crucial roles in terrestrial carbon (C) nitrogen (N) cycles, yet scalable quantifications biocrusts their biogeochemical contributions notably lacking. While remote sensing has enormous potential to assess, scale, contextualize functions, the applicability hyperspectral data predicting C‐ N‐related biocrust traits remains largely unexplored. We address...