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185 results on '"Alizadeh, Mohammad Reza"'

2. Soil Erosion in the United States. Present and Future (2020-2050)

Author

Shojaeezadeh, Shahab Aldin, Al-Wardy, Malik, Nikoo, Mohammad Reza, Mooselu, Mehrdad Ghorbani, Alizadeh, Mohammad Reza, Adamowski, Jan Franklin, Moradkhani, Hamid, Alamdari, Nasrin, and Gandomi, Amir H.

Subjects
Physics - Atmospheric and Oceanic Physics, Computer Science - Machine Learning
Abstract

Soil erosion is a significant threat to the environment and long-term land management around the world. Accelerated soil erosion by human activities inflicts extreme changes in terrestrial and aquatic ecosystems, which is not fully surveyed/predicted for the present and probable future at field-scales (30-m). Here, we estimate/predict soil erosion rates by water erosion, (sheet and rill erosion), using three alternative (2.6, 4.5, and 8.5) Shared Socioeconomic Pathway and Representative Concentration Pathway (SSP-RCP) scenarios across the contiguous United States. Field Scale Soil Erosion Model (FSSLM) estimations rely on a high resolution (30-m) G2 erosion model integrated by satellite- and imagery-based estimations of land use and land cover (LULC), gauge observations of long-term precipitation, and scenarios of the Coupled Model Intercomparison Project Phase 6 (CMIP6). The baseline model (2020) estimates soil erosion rates of 2.32 Mg ha 1 yr 1 with current agricultural conservation practices (CPs). Future scenarios with current CPs indicate an increase between 8% to 21% under different combinations of SSP-RCP scenarios of climate and LULC changes. The soil erosion forecast for 2050 suggests that all the climate and LULC scenarios indicate either an increase in extreme events or a change in the spatial location of extremes largely from the southern to the eastern and northeastern regions of the United States.

Published
2022

3. Elevation-dependent intensification of fire danger in the western United States

Author

Alizadeh, Mohammad Reza, Abatzoglou, John T, Adamowski, Jan, Modaresi Rad, Arash, AghaKouchak, Amir, Pausata, Francesco SR, and Sadegh, Mojtaba

Subjects
Ecological Applications, Environmental Sciences
Abstract

Studies have identified elevation-dependent warming trends, but investigations of such trends in fire danger are absent in the literature. Here, we demonstrate that while there have been widespread increases in fire danger across the mountainous western US from 1979 to 2020, trends were most acute at high-elevation regions above 3000 m. The greatest increase in the number of days conducive to large fires occurred at 2500-3000 m, adding 63 critical fire danger days between 1979 and 2020. This includes 22 critical fire danger days occurring outside the warm season (May-September). Furthermore, our findings indicate increased elevational synchronization of fire danger in western US mountains, which can facilitate increased geographic opportunities for ignitions and fire spread that further complicate fire management operations. We hypothesize that several physical mechanisms underpinned the observed trends, including elevationally disparate impacts of earlier snowmelt, intensified land-atmosphere feedbacks, irrigation, and aerosols, in addition to widespread warming/drying.

Published
2023

9. Increasing Heat‐Stress Inequality in a Warming Climate

Author

Alizadeh, Mohammad Reza, Abatzoglou, John T, Adamowski, Jan F, Prestemon, Jeffrey P, Chittoori, Bhaskar, Asanjan, Ata Akbari, and Sadegh, Mojtaba

Subjects
Behavioral and Social Science, Climate-Related Exposures and Conditions, Basic Behavioral and Social Science, Climate Action, Reduced Inequalities, heatwave, inequality, climate change, CMIP6, adaptation, Atmospheric Sciences, Physical Geography and Environmental Geoscience, Environmental Science and Management
Published
2022

12. Warming enabled upslope advance in western US forest fires

Author

Alizadeh, Mohammad Reza, Abatzoglou, John T, Luce, Charles H, Adamowski, Jan F, Farid, Arvin, and Sadegh, Mojtaba

Subjects
Agricultural, Veterinary and Food Sciences, Ecological Applications, Environmental Sciences, Forestry Sciences, Climate Change, Forests, Models, Theoretical, United States, Wildfires, wildfire, fire elevation, climate change, climate velocity, montane forests
Abstract

Increases in burned area and large fire occurrence are widely documented over the western United States over the past half century. Here, we focus on the elevational distribution of forest fires in mountainous ecoregions of the western United States and show the largest increase rates in burned area above 2,500 m during 1984 to 2017. Furthermore, we show that high-elevation fires advanced upslope with a median cumulative change of 252 m (-107 to 656 m; 95% CI) in 34 y across studied ecoregions. We also document a strong interannual relationship between high-elevation fires and warm season vapor pressure deficit (VPD). The upslope advance of fires is consistent with observed warming reflected by a median upslope drift of VPD isolines of 295 m (59 to 704 m; 95% CI) during 1984 to 2017. These findings allow us to estimate that recent climate trends reduced the high-elevation flammability barrier and enabled fires in an additional 11% of western forests. Limited influences of fire management practices and longer fire-return intervals in these montane mesic systems suggest these changes are largely a byproduct of climate warming. Further weakening in the high-elevation flammability barrier with continued warming has the potential to transform montane fire regimes with numerous implications for ecosystems and watersheds.

Published
2021

35. Soil properties and crop yield under different tillage methods for rapeseed cultivation in paddy fields

Author

Alizadeh Mohammad Reza and Allameh Alireza

Subjects
rapeseed, tillage, grain yield, soil physical properties., Agriculture
Abstract

A two-year research was conducted to investigate the effect of different tillage methods on some soil physical characteristics and crop yield in rapeseed cultivation after rice harvesting. Five tillage treatments including: (i) using rotavator, once to depth of 10-15 cm (T1), (ii) using rotavator, twice to depth of 10-15 cm (T2), (iii) using moldboard plow to depth of 25 cm + rotavator, once to depth of 10-15 cm (T3), (iv) no-till planting through removing rice stubbles from plots (T4), and (v) no-till planting without removing rice stubbles from plots (T5), were evaluated under randomized complete block design (RCBD) in three replications. The biannual results revealed that the effect of tillage methods was significant (p

Published
2015
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