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Articles 29611 - 29640 of 59532
Full-Text Articles in Earth Sciences
Causes And Characteristics Of Electrical Resistivity Variability In Shallow (<4 M) Soils In Taylor Valley, East Antarctica, William S. Gutterman
Causes And Characteristics Of Electrical Resistivity Variability In Shallow (<4 M) Soils In Taylor Valley, East Antarctica, William S. Gutterman
LSU Master's Theses
The McMurdo Dry Valleys are the largest ice-free region in Antarctica and are characterized as a polar desert environment. Soils in the region are typically very dry (<1% soil water by weight) and remain frozen for most of the year. Increases in air temperature and incoming solar radiation during the austral summer generate meltwater from glaciers, ground ice, and snow patches supplying moisture to soils and altering the physical and chemical makeup of the subsurface. Previous studies have utilized airborne electromagnetic surveys (AEM) to analyze groundwater systems in the deep subsurface but have not yet examined soil moisture in the shallow (<4 m) subsurface. Here, I used electrical resistivity data from two AEM surveys (2011 and 2018) and soil geochemical data from three transects to characterize the spatial heterogeneity of soil properties in the near-subsurface of lower Taylor Valley. Soil resistivities from 2011 and 2018 range from 33.2 Ωm to 3535 Ωm with low elevations of <100 meters above sea level (masl) typically displaying the lowest resistivities and high elevations displaying greater resistivities. Liquid brine fractions were empirically estimated from electrical resistivity values using Archie’s Law and range from 0.3% to 68.2% for soils with resistivities <200 Ωm. Additionally, soil transect data show greater percentages of fine-grained sediments (<63 µm) exist at elevations <100 masl where soil resistivities begin decreasing. Resistivity variability in the subsurface is ultimately controlled by the site history, local and regional climate, soil salinity, soil moisture, soil lithology.
Mobility And Development: Iranian Perspective, Hossein Badripour
Mobility And Development: Iranian Perspective, Hossein Badripour
IGC Proceedings (1977-2023)
No abstract provided.
Designing Land Taxes To Promote Conservation Through Use Of Rangelands: Bio‐Economic Modeling Of Farm Decision‐Making In Southern Namibia, Stephanie E. Domptail, Ernst‐August Nuppenau
Designing Land Taxes To Promote Conservation Through Use Of Rangelands: Bio‐Economic Modeling Of Farm Decision‐Making In Southern Namibia, Stephanie E. Domptail, Ernst‐August Nuppenau
IGC Proceedings (1977-2023)
No abstract provided.
Survey Of The Advanced Development Of Pastoral Education In Xilin Gol League, Yunhua Zhang
Survey Of The Advanced Development Of Pastoral Education In Xilin Gol League, Yunhua Zhang
IGC Proceedings (1977-2023)
No abstract provided.
Protecting Hulun Buir Rangeland Requires Improving The Awareness Of The Importance Of The Ecological Status‐Based On An Investigation In Chen Baerhu Banner, Yunhua Zhang, Rui Liu
Protecting Hulun Buir Rangeland Requires Improving The Awareness Of The Importance Of The Ecological Status‐Based On An Investigation In Chen Baerhu Banner, Yunhua Zhang, Rui Liu
IGC Proceedings (1977-2023)
No abstract provided.
Improving The Policy Of Steppe Ecology Management And Promoting Sustainable Development In The Pasture Region: Based On Investigation In Inner Mongolia And Gansu Province, Yunhua Zhang
IGC Proceedings (1977-2023)
No abstract provided.
Suggestions For Grassland Ecosystem Protection And Development In Heilongjiang Province, Y. X. Zhang, G. Q. Han, Duofeng Pan, Z. B. Shen, F. L. Tang
Suggestions For Grassland Ecosystem Protection And Development In Heilongjiang Province, Y. X. Zhang, G. Q. Han, Duofeng Pan, Z. B. Shen, F. L. Tang
IGC Proceedings (1977-2023)
No abstract provided.
The Livestock And Forage Balance Policy In Practice In China — Evidence From Inner Mongolia Autonomous Region, L. Yang, Saixiyala, Y. L. Ma, M. W. Jiang
The Livestock And Forage Balance Policy In Practice In China — Evidence From Inner Mongolia Autonomous Region, L. Yang, Saixiyala, Y. L. Ma, M. W. Jiang
IGC Proceedings (1977-2023)
No abstract provided.
Strengthening Pastoral Organization And Indigenous Knowledge For Sustainable Rangeland Management In Nepal, L. Wen, Shikui Dong, K. K. Shrestha, D. Pariya, Zhaoli Yan, Eklabya Sharma
Strengthening Pastoral Organization And Indigenous Knowledge For Sustainable Rangeland Management In Nepal, L. Wen, Shikui Dong, K. K. Shrestha, D. Pariya, Zhaoli Yan, Eklabya Sharma
IGC Proceedings (1977-2023)
No abstract provided.
Who's Carrying Capacity?, Wenjun Li, Qian Zhang, Yina Xie, Changling Li, Yanbo Li
Who's Carrying Capacity?, Wenjun Li, Qian Zhang, Yina Xie, Changling Li, Yanbo Li
IGC Proceedings (1977-2023)
No abstract provided.
Restoration Of Kyrgyz Traditional Knowledge For Sustainable Pasture Management And Use, Asyl Undeland
Restoration Of Kyrgyz Traditional Knowledge For Sustainable Pasture Management And Use, Asyl Undeland
IGC Proceedings (1977-2023)
No abstract provided.
Mgrre_Thinsections_Mgrre_13_40, Mgrre
Ice-Crystal Traces Imply Ephemeral Freezing In Early Permian Equatorial Pangea, Lily S. Pfeifer, Brooke A. Birkett, Jean Van Den Driessche, Stephane Pochat, Geriliyn S. Soreghan
Ice-Crystal Traces Imply Ephemeral Freezing In Early Permian Equatorial Pangea, Lily S. Pfeifer, Brooke A. Birkett, Jean Van Den Driessche, Stephane Pochat, Geriliyn S. Soreghan
School of Earth & Environment Departmental Research
Delicate impressions in lacustrine strata of the lower Permian (lower Cisuralian) Usclas Formation record ephemeral freezing in equatorial Pangea. These sediments accumulated in the paleoequatorial and intramontane Lodève Basin (southern Massif Central, France) during peak icehouse conditions of the Late Paleozoic Ice Age. Experimental replication of these features supports the interpretation that they are ice-crystal molds. Evidence for films of ice in marginal-lacustrine sediment at such low latitudes and inferred low to moderate altitudes (1–2 km) calls for a reevaluation of climate conditions in eastern equatorial Pangea. Ephemeral freezing implies either cold tropical temperatures (~5 °C cooler than the Last …
Mgrre_Thinsections_Mgrre_118_39, Mgrre
Mgrre_Thinsections_Mgrre_118_40, Mgrre
Mgrre_Thinsections_Mgrre_118_47, Mgrre
Mgrre_Thinsections_Mgrre_118_46, Mgrre
Mgrre_Thinsections_Mgrre_118_50, Mgrre
Mgrre_Thinsections_Mgrre_118_52, Mgrre
Mgrre_Thinsections_Mgrre_118_54, Mgrre
Mgrre_Thinsections_Mgrre_118_53, Mgrre
Mgrre_Thinsections_Mgrre_118_57, Mgrre
Mgrre_Thinsections_Mgrre_118_60, Mgrre
Mgrre_Thinsections_Mgrre_118_55, Mgrre
Mgrre_Thinsections_Mgrre_118_58, Mgrre
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Mgrre_Thinsections_Mgrre_118_62, Mgrre
Mgrre_Thinsections_Mgrre_118_64, Mgrre