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Articles 15691 - 15720 of 16206
Full-Text Articles in Earth Sciences
Determination Of Photon Shielding Parameters For Soils In Mangrove Forests, Frederick C. Hila, Gerald P. Dicen, Abigaile Mia V. Javier-Hila, Alvie Asuncion-Astronomo, Neil Raymund D. Guillermo, Roland V. Rallos, Ian A. Navarrete, Alberto V. Amorsolo Jr
Determination Of Photon Shielding Parameters For Soils In Mangrove Forests, Frederick C. Hila, Gerald P. Dicen, Abigaile Mia V. Javier-Hila, Alvie Asuncion-Astronomo, Neil Raymund D. Guillermo, Roland V. Rallos, Ian A. Navarrete, Alberto V. Amorsolo Jr
Environmental Science Faculty Publications
The mass attenuation coefficient (MAC), effective atomic number (Zeff), and effective electron density (Neff) values of soils in mangrove forests across the Philippine islands were investigated. In addition, ENDF/B-VI.8 cross-section data library was used for interpolating Zeff and Neff values. Photon energies considered in this study ranged from 59.5–1332 keV. MAC values were obtained using MCNP5 and PHITS Monte Carlo (MC) simulations and were found to be in good agreement with XCOM and values in literature. Results for Zeff were in good agreement with values obtained using Phy-X/ZeXTRa program. Each shielding parameter was …
Climate, Vegetation, And Weathering Across Space And Time In Lake Tanganyika (Tropical Eastern Africa), Sarah J. Ivory, Michael M. Mcglue, Cara Peterman, Patrick Baldwin, Joseph Lucas, Andrew Cohen, James Russell, Justina Saroni, Emma Msaky, Ishmael Kimirei, Michael Soreghan
Climate, Vegetation, And Weathering Across Space And Time In Lake Tanganyika (Tropical Eastern Africa), Sarah J. Ivory, Michael M. Mcglue, Cara Peterman, Patrick Baldwin, Joseph Lucas, Andrew Cohen, James Russell, Justina Saroni, Emma Msaky, Ishmael Kimirei, Michael Soreghan
Earth and Environmental Sciences Faculty Publications
Climate and vegetation influence weathering rates and processes; however, evaluating the effects of each and feedbacks between systems, has yet to be accomplished for many types of landscapes. A detailed understanding of how these processes interact to shape landscapes is particularly crucial for reconciling future scenarios of changing climate, where profound alterations to both the biosphere and geosphere are anticipated. In the tropics, ecosystem services, such as soil and water quality, are linked to both vegetation and weathering processes that form a strong control on natural resources that are the foundation of many communities’ daily subsistence. This understanding is further …
New Magnetostratigraphic Insights From Iceberg Alley On The Rhythms Of Antarctic Climate During The Plio-Pleistocene, Brendan T. Reilly, Lisa Tauxe, Stefanie Brachfeld, Maureen Raymo, Ian Bailey, Sidney Hemming, Michael E. Weber, Trevor Williams, Marga Garcia, Michelle Guitard, Yasmina M. Martos, Lara F. Pérez, Xufeng Zheng, Linda Armbrecht, Fabricio G. Cardillo, Zhiheng Du, Gerson Fauth, Anna Glueder, Marcus Gutjahr, Iván Hernández-Almeida, Frida S. Hoem, Ji Hwan Hwang, Mutsumi Iizuka, Yuji Kato, Bridget Kenlee, Suzanne O’Connell, Victoria Peck, Thomas A. Ronge, Osamu Seki, Shubham Tripathi, Jonathan Warnock
New Magnetostratigraphic Insights From Iceberg Alley On The Rhythms Of Antarctic Climate During The Plio-Pleistocene, Brendan T. Reilly, Lisa Tauxe, Stefanie Brachfeld, Maureen Raymo, Ian Bailey, Sidney Hemming, Michael E. Weber, Trevor Williams, Marga Garcia, Michelle Guitard, Yasmina M. Martos, Lara F. Pérez, Xufeng Zheng, Linda Armbrecht, Fabricio G. Cardillo, Zhiheng Du, Gerson Fauth, Anna Glueder, Marcus Gutjahr, Iván Hernández-Almeida, Frida S. Hoem, Ji Hwan Hwang, Mutsumi Iizuka, Yuji Kato, Bridget Kenlee, Suzanne O’Connell, Victoria Peck, Thomas A. Ronge, Osamu Seki, Shubham Tripathi, Jonathan Warnock
Department of Earth and Environmental Studies Faculty Scholarship and Creative Works
International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well-resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ18O records. …
Resonant Frequency Derived From The Rayleigh‐Wave Dispersion Image: The High‐Impedance Boundary Problem, Lee M. Liberty, James St. Clair, T. Dylan Mikesell, William D. Schermerhorn
Resonant Frequency Derived From The Rayleigh‐Wave Dispersion Image: The High‐Impedance Boundary Problem, Lee M. Liberty, James St. Clair, T. Dylan Mikesell, William D. Schermerhorn
Geosciences Faculty Publications and Presentations
We present a simple and automated approach to estimate primary site‐response resonance, layer thickness, and shear‐wave velocity directly from a dispersion image for a layer over half‐space problem. We demonstrate this for high‐impedance boundary conditions that lie in the upper tens of meters. Our approach eliminates the need for time‐consuming dispersion curve picking and 1D shear‐wave velocity inversion for large data volumes that can capture velocity structure in profile. We highlight important relationships between dispersion characteristics and resonance parameters through synthetic modeling and field data acquired over Atlantic Coastal Plain sediments. In this environment, shallow soil conditions are critical to …
Identifying Nitrogen Source And Seasonal Variation In A Black Mangrove (Avicennia Germinans) Communityof The South Texas Coast, Ashley Elizabeth Murphy, Carlos E. Cintra-Buenrostro, Alejandro Fierro-Cabo
Identifying Nitrogen Source And Seasonal Variation In A Black Mangrove (Avicennia Germinans) Communityof The South Texas Coast, Ashley Elizabeth Murphy, Carlos E. Cintra-Buenrostro, Alejandro Fierro-Cabo
School of Earth, Environmental, & Marine Sciences Faculty Publications
Black mangrove (Avicennia germinans) stands in south Texas grow in association with other autotrophic organisms including herbaceous halophytes and cyanobacterial mats. Despite the relevant ecosystem services provided by this coastal plant community, limited information exists on its functioning, in particular as it pertains to nutrient dynamics, namely nitrogen (N). Nitrogen stable isotopes were used to assess potential N sources for plant growth in this community. Plant tissue (leaves), cyanobacteria, and sediment were sampled once every season for one year. Total N in A. germinans (2.6 %) and associated saltwort (Batis maritima) (2.1 %) was higher than in cyanobacteria (0.6 %), …
Characterization And Oil Recovery Enhancement By A Polymeric Nanogel Combined With Surfactant For Sandstone Reservoirs, Mustafa Mohammed Almahfood, Baojun Bai
Characterization And Oil Recovery Enhancement By A Polymeric Nanogel Combined With Surfactant For Sandstone Reservoirs, Mustafa Mohammed Almahfood, Baojun Bai
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The characterization and enhanced oil recovery mechanisms of a nanosized polymeric cross-linked gel are presented herein. A negatively charged nanogel was synthesized using a typical free radical suspension polymerization process by employing 2-acrylamido 2-methyl propane sulfonic acid monomer. The synthesized nanogel showed a narrow size distribution with one peak pointing to a predominant homogeneous droplet size. The charged nanogels were also able to adsorb at the oil-water interfaces to reduce interfacial tension and stabilize oil-in-water emulsions, which ultimately improved the recovered oil from hydrocarbon reservoirs. In addition, a fixed concentration of negatively charged surfactant (sodium dodecyl sulfate or SDS) was …
Microstructural Characteristics Of Deformed Quartz Under Non-Steady-State Conditions, Hamidreza Soleymani
Microstructural Characteristics Of Deformed Quartz Under Non-Steady-State Conditions, Hamidreza Soleymani
Dissertations, Theses, and Capstone Projects
Because of the long timescale of many geological processes (millions of years), it has been traditionally assumed that the existing forces acting on the rocks at deep crustal levels are in equilibrium (i.e., steady-state). An alternative assumption, however, suggests that rocks in the lower crust and upper mantle are continuously evolving and exchanging energy at various time scales. Under the latter assumption (i.e., non-steady-state), certain geologic systems may never attain equilibrium regardless of the length and the time scale of operating geologic events. These two “endpoint” assumptions suggest there is a wide range of geologically reasonable conditions under which rocks …
Frozen In Time: A Numerical Modeling Approach To The Study Of Ice Bearing Planetesimals Through Carbonaceous Chondrites, Jasmine M. Bayron
Frozen In Time: A Numerical Modeling Approach To The Study Of Ice Bearing Planetesimals Through Carbonaceous Chondrites, Jasmine M. Bayron
Dissertations, Theses, and Capstone Projects
Icy planetesimals are significant objects of study for meteoritics, planetary science, and astrobiology due to their connections to the origins of life and liquid water on Earth. An existing closed system aqueous alteration model was adapted to simulate several scenarios involving early Solar System geologic processes occurring in an icy planetesimal interior. The model described in this work has been developed not only to test the validity of constraints currently thought to apply to CM1 parent bodies, but to directly compare the implications of these constraints for the isotopic composition and the modal mineralogy of carbonaceous chondrites. Isotopic ratios of …
Influence Of Land Use Intensity And Management On Arbuscular Mycorrhizal Fungi-Avocado Symbiosis, Pushpa Soti, Bulent Toprak, Nina De La Rosa, Krish Jayachandran
Influence Of Land Use Intensity And Management On Arbuscular Mycorrhizal Fungi-Avocado Symbiosis, Pushpa Soti, Bulent Toprak, Nina De La Rosa, Krish Jayachandran
School of Earth, Environmental, & Marine Sciences Faculty Publications
This study was done to assess the effect of soil disturbance on arbuscular mycorrhizal fungi spore abundance and root colonization in avocado (Persea americana Mill.). Rhizosphere soil and root samples of avocado were collected from different farms in south Florida and analyzed for degree of mycorrhizal colonization in roots, spore density and diversity in soil along with soil characteristics. There was significant difference in the soil characteristics among the different farms. Similarly, there was a significant difference in the degree of mycorrhizal colonization in the roots and the arbuscular mycorrhizal fungi spore morphotypes among different land use and management practices. …
Socio-Economic Predictors, Soil Fertility Knowledge Domains And Strategies For Sustainable Maize Intensification In Embu County, Kenya, Monicah Wanjiku Mucheru-Muna, Mildred Achieng Ada, Jayne Njeri Mugwe, Franklin Somoni Mairura, Esther Mugi-Ngenga, Shammie Zingore, James Kinyua Mutegi
Socio-Economic Predictors, Soil Fertility Knowledge Domains And Strategies For Sustainable Maize Intensification In Embu County, Kenya, Monicah Wanjiku Mucheru-Muna, Mildred Achieng Ada, Jayne Njeri Mugwe, Franklin Somoni Mairura, Esther Mugi-Ngenga, Shammie Zingore, James Kinyua Mutegi
All Peer-Reviewed Publications
Integrated Soil Fertility Management (ISFM) practices are widely recognized as crucial interventions but knowledge-intensive technologies for farmers in Sub-Saharan Africa (SSA). Very few studies have synthesized the knowledge gaps between small-holder practices and recommended ISFM packages. A farm survey was therefore carried out in Runyenjes sub-County of Embu to determine factors influencing the quality of ISFM knowledge considering inorganic fertilizer, organic manure, integrated soil inputs, and improved maize seeds. One hundred small-scale maize farmers were systematically sampled in Embu County, Kenya, using a cross-sectional survey design. The most significant factors shaping the quality of ISFM knowledge (p < 0.05) included gender, age, household size, land under maize, off-farm earnings, maize yield, members involved in farming, farming experience, education level, and farm size. Farmers recorded lower knowledge scores for technical ISFM themes including soil liming, soil testing, fertilizer types, fertilizer functions, curing of organic manure, compost manure management, crop spacing, combination ratios for integrated inputs, and the labor and cost-benefit implications of integrated inputs, revealing important ISFM knowledge gaps. High-quality knowledge of blended fertilizers and DAP use was associated with increased soil testing and soil liming knowledge, respectively. Multivariate analysis of ISFM knowledge items provided a high-quality understanding of the structure of ISFM knowledge among farmers in Embu County, which is useful in developing future ISFM dissemination strategies. Humic nitisol, Fertilizer, ISFM strategies, ISFM knowledge quality, improved seeds, manure
Nebraska Statewide Groundwater-Level Monitoring Report 2020, Aaron R. Young, Mark E. Burbach, Leslie M. Howard, Sue Olafsen Lackey, Robert Matthew Joeckel
Nebraska Statewide Groundwater-Level Monitoring Report 2020, Aaron R. Young, Mark E. Burbach, Leslie M. Howard, Sue Olafsen Lackey, Robert Matthew Joeckel
Conservation and Survey Division: Faculty and Staff Publications
The term “groundwater” has come to be all but synonymous with Nebraska. Nearly three-quarters of the total volume of the High Plains Aquifer lies beneath the state. Groundwater maintains our streams, our ecosystems, our people, and our vitally important agricultural economy. Nebraska’s total groundwater resource is vast, yet it is also vulnerable to natural and anthropogenic changes, necessitating a long-term commitment to wise management through informed decision-making. Monitoring, studying, and reporting form the essential basis for such management and, ultimately, for meeting the myriad challenges presented by change.
Growth Characteristics And Productivity Of A New Cold‐Tolerant Italian Ryegrass (Lolium Multiflorum L.) Variety Kowinearly In Northern Part Of South Korea, Gi-Jun Choi, Young-Chul Lim, Byung-Ryul Sung, Ki‐Yong Kim, Jong-Kyung Lee, Keun-Bal Lim, Hyung-Soo Park, Sung Seo, Hee-Chung Ji
Growth Characteristics And Productivity Of A New Cold‐Tolerant Italian Ryegrass (Lolium Multiflorum L.) Variety Kowinearly In Northern Part Of South Korea, Gi-Jun Choi, Young-Chul Lim, Byung-Ryul Sung, Ki‐Yong Kim, Jong-Kyung Lee, Keun-Bal Lim, Hyung-Soo Park, Sung Seo, Hee-Chung Ji
IGC Proceedings (1977-2023)
No abstract provided.
Estilosantes Campo Grande: An Economical And Environmental Success Forage Legume For The Tropics, Celso D. Fernandes, Bela Grof, Rosangela M. S. Resende, Jaqueline R. Verzignassi, Cesar Heraclides Behling Miranda
Estilosantes Campo Grande: An Economical And Environmental Success Forage Legume For The Tropics, Celso D. Fernandes, Bela Grof, Rosangela M. S. Resende, Jaqueline R. Verzignassi, Cesar Heraclides Behling Miranda
IGC Proceedings (1977-2023)
No abstract provided.
Evaluation Of The Intake Of Fresh Mulberry (Morus Alba) In Crossbred Large White Pigs: Morphometric, Histological And Hematological Study, Yuvan Contino, F. Ojeda, R. Herrera, Nancy Altunaga, Guadalupe Pérez, J. L. Moliner
Evaluation Of The Intake Of Fresh Mulberry (Morus Alba) In Crossbred Large White Pigs: Morphometric, Histological And Hematological Study, Yuvan Contino, F. Ojeda, R. Herrera, Nancy Altunaga, Guadalupe Pérez, J. L. Moliner
IGC Proceedings (1977-2023)
No abstract provided.
Coastal Watershed Monitoring And Management: Geomorphology, Geochemistry, And Hydrologic Modeling Of Los Peñasquitos Creek, Ca, Ravleen Khalsa-Basra
Coastal Watershed Monitoring And Management: Geomorphology, Geochemistry, And Hydrologic Modeling Of Los Peñasquitos Creek, Ca, Ravleen Khalsa-Basra
Theses
Rivers in semi-arid climates are directly influenced by local geographic and hydrologic conditions and impacted by modifications to hydrology via urbanization. Changes can influence erosion, morphology, habitat sustainability, and watershed health. In highly urbanized southern California coastal regions, these rare open spaces provide vital ecosystem services. Los Peñasquitos Creek in San Diego County is one such watershed. Using stream surveying and laboratory methods we quantified channel characteristics, grain size distribution, total metal concentration [M], organic carbon (%OC), and phosphate to longitudinally characterize the creek for improved management. Results identified three distinct reaches in the watershed (upper, middle, lower). Downstream, depth …
Artisanal Ceramic Factories Using Wood Combustion: A Nanoparticles And Human Health Study, Kátia Martinello, James C. Hower, Diana Pinto, Carlos E. Schnorr, Guilherme L. Dotto, Marcos Leandro Silva Oliveira, Claudete Gindri Ramos
Artisanal Ceramic Factories Using Wood Combustion: A Nanoparticles And Human Health Study, Kátia Martinello, James C. Hower, Diana Pinto, Carlos E. Schnorr, Guilherme L. Dotto, Marcos Leandro Silva Oliveira, Claudete Gindri Ramos
Earth and Environmental Sciences Faculty Publications
The ceramics industry, resulting from developments of modern compounds, is a segment of great influence in worldwide sustainability. Artisanal ceramic factories based on wood combustion have significant risks for the creation and discharge of atmosphere nanoparticles (NPs) and ultra-fine particles (UFPs). At present, there is insufficient recognition on the influence of engineered-NPs on the atmosphere and health. Real improvements are indispensable to diminish contact with NPs. The present study demonstrates the main NPs and UFPS present in an area of intense artisanal wood-combustion ceramic manufacturing. Particulate matter was sampled for morphological, chemical, and geochemical studies by sophisticated electron microbeam microscopy, …
Modelling Sustainability Of Agropastoral Systems In Bolivian Arid Highlands, I. Acosta‐Alba, Muriel Tichit, F. Leger
Modelling Sustainability Of Agropastoral Systems In Bolivian Arid Highlands, I. Acosta‐Alba, Muriel Tichit, F. Leger
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Cattle Grazing On Native Forage Biomass Yield In Extensive Grazing Systems Of Southern Bolivia, H. Alzérreca, M. Miranda, Svenja Marquardt, Michael Kreuzer, Andrea C. Mayer
Effect Of Cattle Grazing On Native Forage Biomass Yield In Extensive Grazing Systems Of Southern Bolivia, H. Alzérreca, M. Miranda, Svenja Marquardt, Michael Kreuzer, Andrea C. Mayer
IGC Proceedings (1977-2023)
No abstract provided.
Study Of Phenological Stages Effect On Nutritive Values Of Twelve Species In Hamadan Rangelands, Iran, M. R. Sadeghimanesh, Hossein Arzani, Hossein Azarnivand, E. Shahriary
Study Of Phenological Stages Effect On Nutritive Values Of Twelve Species In Hamadan Rangelands, Iran, M. R. Sadeghimanesh, Hossein Arzani, Hossein Azarnivand, E. Shahriary
IGC Proceedings (1977-2023)
No abstract provided.
Sustainable Grassland Management--A Case‐Based Analysis Of 3 Tibetan Villages In Sichuan, China, Wei Han, Xiaoming Guo
Sustainable Grassland Management--A Case‐Based Analysis Of 3 Tibetan Villages In Sichuan, China, Wei Han, Xiaoming Guo
IGC Proceedings (1977-2023)
No abstract provided.
Prevention Of Ruminal Acidosis By Manipulating Physically Effective Fibre (Pendf) Of Forage, W. Z. Yang, K. A. Beauchemin
Prevention Of Ruminal Acidosis By Manipulating Physically Effective Fibre (Pendf) Of Forage, W. Z. Yang, K. A. Beauchemin
IGC Proceedings (1977-2023)
No abstract provided.
Direct Sowing Of Maize In A Grass Sward, N. Van Eekeren, U. Prins
Direct Sowing Of Maize In A Grass Sward, N. Van Eekeren, U. Prins
IGC Proceedings (1977-2023)
No abstract provided.
Effect On The Wheatgrass Somaclone Inducement By Genotype And Culture Medium, Jihong Xie, Jinfeng Yun, Jinchuan Liu
Effect On The Wheatgrass Somaclone Inducement By Genotype And Culture Medium, Jihong Xie, Jinfeng Yun, Jinchuan Liu
IGC Proceedings (1977-2023)
No abstract provided.
Development Of Genomic Tools For Wheatgrass And Wildrye Improvement, Richard R. C. Wang, B. Shaun Bushman, S. R. Larson, I. W. Mott
Development Of Genomic Tools For Wheatgrass And Wildrye Improvement, Richard R. C. Wang, B. Shaun Bushman, S. R. Larson, I. W. Mott
IGC Proceedings (1977-2023)
No abstract provided.
Isolation And Cloning Of Genes Induced By Sodium Carbonate In Leymus Chinensis, Z. W. Liang, X. J. Kong, M. Liu, H. Y. Ma, Z. C. Wang
Isolation And Cloning Of Genes Induced By Sodium Carbonate In Leymus Chinensis, Z. W. Liang, X. J. Kong, M. Liu, H. Y. Ma, Z. C. Wang
IGC Proceedings (1977-2023)
No abstract provided.
Integration Of Traditional And Biotech Approaches To Improve Forage Lotus Species For Stressing Environments In South America, Mónica Rebuffo, Juan Sanjuán, Birgit K. Hougaard, Niels Sandal, Lene H. Madsen, Jens Stougaard, Antonio J. Márquez
Integration Of Traditional And Biotech Approaches To Improve Forage Lotus Species For Stressing Environments In South America, Mónica Rebuffo, Juan Sanjuán, Birgit K. Hougaard, Niels Sandal, Lene H. Madsen, Jens Stougaard, Antonio J. Márquez
IGC Proceedings (1977-2023)
No abstract provided.
Developing Ecologically‐Adapted Plants For Farming Systems In Southern Australia: Perennials For The Medium To Low Rainfall Zone, Sarita Jane Bennett
Developing Ecologically‐Adapted Plants For Farming Systems In Southern Australia: Perennials For The Medium To Low Rainfall Zone, Sarita Jane Bennett
IGC Proceedings (1977-2023)
No abstract provided.
Sustainability Of Semi‐Arid Extensive Livestock Systems In Senegal: Elements For Modelling Animal‐Plant Interactions, G. Chirat, F. Bocquier, F. Bousquet, A. Ickowicz
Sustainability Of Semi‐Arid Extensive Livestock Systems In Senegal: Elements For Modelling Animal‐Plant Interactions, G. Chirat, F. Bocquier, F. Bousquet, A. Ickowicz
IGC Proceedings (1977-2023)
No abstract provided.
Stick-Slip Tremor Beneath An Alpine Glacier, J. Umlauft, F. Lindner, P. Roux, T. D. Mikesell, M. M. Haney, M. Korn, F. T. Walter
Stick-Slip Tremor Beneath An Alpine Glacier, J. Umlauft, F. Lindner, P. Roux, T. D. Mikesell, M. M. Haney, M. Korn, F. T. Walter
Geosciences Faculty Publications and Presentations
Sliding of glacial ice over its base is typically described by a frictionless or slowly deforming bed. This view is challenged by recent seismic observations of stick-slip motion at the icebed interface. We revisit a high-frequency (20–35 Hz) harmonic tremor recorded on Gornergletscher, Switzerland. In contrast to previous interpretation in terms of glaciohydraulic tremor, we present evidence for superimposed stick-slip episodes as tremor sources: we locate the tremor source with matched field processing polarity optimization, which allows for azimuthal polarity patterns associated with nonisotropic moment tensors and yields a tremor source clustering near the glacier bed. Our analysis confirms an …
Spatial Patterns And Drivers Of Nonperennial Flow Regimes In The Contiguous United States, Kendra Kaiser
Spatial Patterns And Drivers Of Nonperennial Flow Regimes In The Contiguous United States, Kendra Kaiser
Geosciences Faculty Publications and Presentations
Over half of global rivers and streams lack perennial flow, and understanding the distribution and drivers of their flow regimes is critical for understanding their hydrologic, biogeochemical, and ecological functions. We analyzed nonperennial flow regimes using 540 U.S. Geological Survey watersheds across the contiguous United States from 1979 to 2018. Multivariate analyses revealed regional differences in no-flow fraction, date of first no flow, and duration of the dry-down period, with further divergence between natural and human-altered watersheds. Aridity was a primary driver of no-flow metrics at the continental scale, while unique combinations of climatic, physiographic and anthropogenic drivers emerged at …