Lake Pontchartrain Data, 2020 Coastal Studies Institute, School of the Coast and Environment, Louisiana State University
Lake Pontchartrain Data, Chunyan Li
The ADCP data file use the RDI standard ASCII format. For the variables please check with the RDI ADCP document. The salinity file has the surface thermosalinigraph data along a river plume inside the Lake Pontchartrain obtained on May 11, 2011, after a freshwater diversion from the Bonnet Carre Spillway from the Mississippi River. Time is in the standard UTC. Data include the surface water temperature (C), salinity (PSU), latitude, longitude, hour, minute, and second. The data were obtained from a moving boat. It was a survey supported by an NSF RAPID project. The data are used in a paper ...
Prehistoric Chaco Canyon, New Mexico: Empty Pilgrimage Center Of The Anasazi Hegemony, 2020 University of Colorado at Boulder
Prehistoric Chaco Canyon, New Mexico: Empty Pilgrimage Center Of The Anasazi Hegemony, Larry Benson, John R. Stein, Richard W. Loose
USGS Staff -- Published Research
Chaco has long been considered a semi-urban environment where elites residing in great houses oversaw the labors of approximately 2,000 individuals occupying small 2 houses on Chaco’s valley floor. Recent studies cast doubt on the Canyon’s ability to provide sufficient meat and maize to sustain a population this large and indicate that archaeological maize and archaeofauna found in the Canyon came from the periphery of the San Juan Basin. An alternative model for Chaco is hereby proposed wherein it was a largely vacant monumental complex to which people from outlying areas made pilgrimage along ceremonial roads. The ...
Weather And Climate Summary And Forecast: January 2020 Report, 2020 Linfield College
Weather And Climate Summary And Forecast: January 2020 Report, Gregory V. Jones
Linfield College Wine Studies Reports
This report provides a summary of the weather and climate forecast for January 2020. It includes forecast information specific to the Pacific Northwest and the western United States, as well as forecast information for other portions of the United States and abroad.
Modeling The Oh-Initiated Oxidation Of Mercury In The Global Atmosphere Without Violating Physical Laws, Theodore Dibble, Hanna L. Tetu, Khoa T. Lam, Colin P. Thackray, Daniel J. Jacob
Chemistry Faculty Scholarship
In 2005, Calvert and Lindberg wrote that the use of laboratory-derived rate constants for OH + Hg(0) “…to determine the extent of Hg removal by OH in the troposphere will greatly over-estimate the importance of Hg removal by this reaction.” The HOHg• intermediate formed from OH + Hg will mostly fall apart in the atmosphere before it can react. By contrast, in laboratory experiments, Calvert and Lindberg expected HOHg• to react with radicals (whose concentrations are much higher than in the atmosphere). Yet almost all models of oxidation of Hg(0) ignore the argument of Calvert and Lindberg. We present a ...
The Prairie Post Quarterly Newsletter Of The High Plains Regional Climate Center- January 2020, 2020 University of Nebraska-Lincoln
The Prairie Post Quarterly Newsletter Of The High Plains Regional Climate Center- January 2020, Natalie Umphlett, Rezaul Mamood, Paul Flanagan, Logan Winters, Kierstin Blomberg, Emilee Lachenmeier, Crystal J. Stiles
Inside this issue:
Message from the director........................................1
Year in review............................2
Updates on engagement and tools.....................................3
Overview of regional climate conditions..................................4
AMS annual meeting.............5
Recent and upcoming travel and activities.............................6
Historical Trends In Air Temperature, Precipitation, And Runoff Of A Plateau Inland River Watershed In North China, 2020 Old Dominion University
Historical Trends In Air Temperature, Precipitation, And Runoff Of A Plateau Inland River Watershed In North China, Along Zhang, Ruizhong Gao, Xixi Wang, Tingxi Liu, Lijing Fang
Civil & Environmental Engineering Faculty Publications
Understanding historical trends in temperature, precipitation, and runoff is important but incomplete for developing adaptive measures to climate change to sustain fragile ecosystems in cold and arid regions, including the Balagaer River watershed on the Mongolian Plateau of northeast China. The objective of this study was to detect such trends in this watershed from 1959 to 2017. The detection was accomplished using a Mann-Kendall sudden change approach at annual and seasonal time scales. The results indicated that the abrupt changes in temperature preceded that in either runoff or precipitation; these abrupt changes occurred between 1970 and 2004. Significant (α = 0 ...
Modeling The Effects Of Global Change On Ecosystem Processes In A Tropical Rainforest, 2020 Iowa State University
Modeling The Effects Of Global Change On Ecosystem Processes In A Tropical Rainforest, Ann E. Russell, William J. Parton Jr.
Natural Resource Ecology and Management Publications
Research Highlights: Ongoing land-use change and climate change in wet tropical forests can potentially drive shifts in tree species composition, representing a change in individual species within a functional group, tropical evergreen trees. The impacts on the global carbon cycle are potentially large, but unclear. We explored the differential effects of species within this functional group, in comparison with the effects of climate change, using the Century model as a research tool. Simulating effects of individual tree species on biome-level biogeochemical cycles constituted a novel application for Century. Background and Objectives: A unique, long-term, replicated field experiment containing five evergreen ...
Microplastics In Aquatic Organisms: Improving Understanding And Identifying Research Directions For The Next Decade, 2020 Portland State University
Microplastics In Aquatic Organisms: Improving Understanding And Identifying Research Directions For The Next Decade, Elise F. Granek, Susanne Brander, E. B. Holland
Environmental Science and Management Faculty Publications and Presentations
The study of environmental microplastics has increased over the past decade, with hundreds of new studies and resultant papers on the presence, fate, and sources of microplastics in marine and freshwater systems (Fig. 1). Despite the explosion of interest in the topic and in comparison to the research on the presence of microplastics in marine or fresh waters, there have been notably fewer studies on the extent to which these debris items are ingested by aquatic organisms and far fewer on the potential consequences, or response to their presence in organismal guts, tissues, and food webs. Even less research has ...
A Proposed Taxonomy For General Aviation Pilot Weather Education And Training, 2020 University of South Alabama
A Proposed Taxonomy For General Aviation Pilot Weather Education And Training, John M. Lanicci, Thomas A. Guinn, Jayde M. King, Beth Blickensderfer, Robert Thomas, Yolanda Ortiz
Journal of Aviation/Aerospace Education & Research
As General Aviation (GA) safety continues to remain a focus of the aviation community, GA pilot weather education and training continues to be an active area of interest within the research community. This study introduces a taxonomy for organizing GA pilot weather education and training materials that was originally conceived as part of the FAA’s Weather Technology In the Cockpit research program. The taxonomy is built upon three main knowledge categories, or tiers:1) Weather Phenomena (which includes hazards); 2) Weather Hazard Products; and 3) Weather Hazard Product Sources and their Application. The concept behind the categorization is to ...
Assessing If Motivation Impacts General Aviation Pilots’ Persistence In Varying Weather Conditions, 2020 Embry-Riddle Aeronautical University
Assessing If Motivation Impacts General Aviation Pilots’ Persistence In Varying Weather Conditions, Sabrina Woods
Dissertations and Theses
Continued flight under visual flight rules into instrument meteorological conditions is the predominant cause for fatal accidents by percentage, for general aviation aircraft operations. It is possible that a pilot’s motivation or reason for flying will override other safer, more logical courses of action when a hazard presents itself. The decision appears to stem from a willingness to persist in a course of action despite factors that indicate an alternate and safer course is warranted. This research addresses what is currently presumed about the decision to continue flying under visual flight rules into instrument conditions and marries those ideas ...
Secchi Disk Measurements In Turbid Water: Supporting Data, 2020 Virginia Institute of Marine Science
Secchi Disk Measurements In Turbid Water: Supporting Data, D. G. Bowers, E. M. Roberts, A. M. Hoguane, K. A. Fall, G. M. Massey, C. T. Friedrichs
No abstract provided.
Abiotic Formation Of Dissolved Organic Sulfur In Anoxic Sediments Of Santa Barbara Basin, 2020 Old Dominion University
Abiotic Formation Of Dissolved Organic Sulfur In Anoxic Sediments Of Santa Barbara Basin, Hussain A. Abdulla, David J. Burdige, Tomoko Komada
OEAS Faculty Publications
Sulfurization has been found to enhance organic matter preservation and petroleum formation in marine sediments. However, we do not yet have a comprehensive understanding of sulfurization mechanisms. In this study, we investigated several possible mechanisms of dissolved organic sulfur (DOS) formation in the top 4.5 m of anoxic sediments of Santa Barbara Basin (SBB), California Borderland. Using Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS), we identified chemical formulas of potential dissolved organic matter (DOM) precursors to these DOS compounds. We also examined how the formulas of abiotically formed DOS changed as a function of depth across a major ...
Metabolic Profiling Reveals Biochemical Pathways Responsible For Eelgrass Response To Elevated Co2 And Temperature, 2020 Old Dominion University
Metabolic Profiling Reveals Biochemical Pathways Responsible For Eelgrass Response To Elevated Co2 And Temperature, Carmen C. Zayas-Santiago, Albert Rivas-Ubach, Li-Jung Kuo, Nicholas D. Ward, Richard C. Zimmerman
OEAS Faculty Publications
As CO2 levels in Earth’s atmosphere and oceans steadily rise, varying organismal responses may produce ecological losers and winners. Increased ocean CO2 can enhance seagrass productivity and thermal tolerance, providing some compensation for climate warming. However, the metabolic shifts driving the positive response to elevated CO2 by these important ecosystem engineers remain unknown. We analyzed whole-plant performance and metabolic profiles of two geographically distinct eelgrass (Zostera marina L.) populations in response to CO2 enrichment. In addition to enhancing overall plant size, growth and survival, CO2 enrichment increased the abundance of Calvin Cycle and nitrogen ...
Data For Paper "Separating Thermal And Viscous Effects Of Temperature On Copepod Respiration And Energy Budget", 2020 Stony Brook University
Data For Paper "Separating Thermal And Viscous Effects Of Temperature On Copepod Respiration And Energy Budget", Abigail Tyrell, Nicholas Fisher, David Fields
SoMAS Research Data
Changes in temperature alter the viscosity of fluids, which impacts the force needed to move and the diffusion rates of gases. This is particularly salient for organisms that operate at mid to low Reynolds numbers. In this study, we investigated the independent effects of changes in temperature and viscosity on oxygen consumption rates of two coastal copepods (Acartia tonsa and Parvocalanus crassirostris) and used bioenergetic models to predict how these patterns could influence copepods in the natural environment. We found that only temperature influenced copepod oxygen consumption rates, indicating that copepods were not impacted by reduced oxygen diffusivity or increased ...
Modeling Iron And Light Controls On The Summer Phaeocystis Antarctica Bloom In The Amundsen Sea Polynya, 2020 Old Dominion University
Modeling Iron And Light Controls On The Summer Phaeocystis Antarctica Bloom In The Amundsen Sea Polynya, Hilde Oliver, Pierre St-Laurent, Robert M. Sherrell, Patricia L. Yaeger
Of all the Antarctic coastal polynyas, the Amundsen Sea Polynya is the most productive per unit area. Observations from the 2010-2011 Amundsen Sea Polynya International Research Expedition (ASPIRE) revealed that both light and iron can limit the growth of phytoplankton (Phaeocystis antarctica), but how these controls manifest over the bloom season is poorly understood, especially with respect to their climate sensitivity. Using a 1-D biogeochemical model, we examine the influence of light and iron limitation on the phytoplankton bloom and vertical carbon flux at 12 stations representing different bloom stages within the polynya. Model parameters are determined by Bayesian optimization ...
Vertical Processes And Resolution Impact Ice Shelf Basal Melting: A Multi-Model Study, 2020 Old Dominion University
Vertical Processes And Resolution Impact Ice Shelf Basal Melting: A Multi-Model Study, David E. Gwyther, Kazuya Kusahara, Xylar S. Asay-Davis, Michael S. Dinniman, Benjamin K. Galton-Fenzi
Understanding ice shelf–ocean interaction is fundamental to projecting the Antarctic ice sheet response to a warming climate. Numerical ice shelf–ocean models are a powerful tool for simulating this interaction, yet are limited by inherent model weaknesses and scarce observations, leading to parameterisations that are unverified and unvalidated below ice shelves. We explore how different models simulate ice shelf–ocean interaction using the 2nd Ice Shelf–Ocean Model Intercomparison Project (ISOMIP+) framework. Vertical discretisation and resolution of the ocean model are shown to have a significant effect on ice shelf basal melt rate, through differences in the distribution of ...
Developing A Uas-Deployable Methane Sensor Using Low-Cost Modular Open-Source Components, 2020 The University of Akron
Developing A Uas-Deployable Methane Sensor Using Low-Cost Modular Open-Source Components, Gavin Demali
Williams Honors College, Honors Research Projects
This project aimed to develop a methane sensor for deployment on an unmanned aerial system (UAS), or drone, platform. This design is centered around low cost, commercially available modular hardware components and open source software libraries. Once successfully developed, this system was deployed at the Bath Nature Preserve in Bath Township, Summit County Ohio in order to detect any potential on site fugitive methane emissions in the vicinity of the oil and gas infrastructure present. The deliverables of this project (i.e. the data collected at BNP) will be given to the land managers there to better inform future management ...
Analysis Of Concurrent Backscatter Coefficients From In-Situ Cloud Probes And Airborne Lidar, 2020 University of North Dakota
Analysis Of Concurrent Backscatter Coefficients From In-Situ Cloud Probes And Airborne Lidar, Shawn Wagner, David J. Delene
The North Dakota Citation Research Aircraft obtained measurements of anvil cirrus clouds over Florida during the summer of 2015 (CAPE2015). The Citation is fitted to take measurements of atmospheric variables (pressure, temperature, dew point, wind velocity, etc...) as well as cloud particle properties (concentration, size-distribution, water content, etc...). Data (at 1 Hz) is included from four flights occuring on 31 July 2015, 1 August 2015, and 2 August 2015. Cloud properties were measured by the Two-Dimensional Stereo probe (2D-S), the High-Volume Precipitation Spectrometer (HVPS3) probe and the Nevzorov probe. Additionally, particle data from the 2D-S and HVPS3 are combined to ...
Secchi Disk Measurements In Turbid Water, 2020 Virginia Institute of Marine Science
Secchi Disk Measurements In Turbid Water, D. G. Bowers, E M. Roberts, A. M. Hoguane, K A. Fall, Grace M. Massey, Carl T. Friedrichs
In the classical theory of the Secchi disk depth, diffuse sunlight falling on the disk is reflected back to the observer’s eye along the most direct route, as a beam. The disappearance depth, ZSD, of the disk is then expected to vary inversely with the sum of the beam and diffuse attenuation coefficients: c+KD. Observations presented here show that, in the most turbid waters sampled, the Secchi disk is visible at greater depths (by a factor of up to 4) than predicted by this theory. In these conditions, the disk appears blurry and it seems likely that some ...
Role Of Delta-Front Erosion In Sustaining Salt Marshes Under Sea-Level Rise And Fluvial Sediment Decline, 2020 Virginia Institute of Marine Science
Role Of Delta-Front Erosion In Sustaining Salt Marshes Under Sea-Level Rise And Fluvial Sediment Decline, Shi Lun Yang, Xiangxin Luo, Stijn Temmerman, Matthew Kirwan, Et Al
Accelerating sea-level rise and decreasing riverine sediment supply are widely considered to lead to global losses of deltaic marshes and their valuable ecosystem services. However, little is known about the degree to which the related erosion of the seaward delta front can provide sediments to sustain salt marshes. Here, we present dataf rom the mesomacrotidal Yangtze Delta demonstrating that marshes have continued to accrete vertically and laterally, despite rapid relative sea-level rise (approx.10 mm yr−1) and a > 70% decrease in the Yangtze River sediment supply. Marsh progradation has decelerated at a lower rate than fluvial sediment reduction, suggesting ...