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The First Ten Months Of Investigation Of Gravity Waves And Temperature Variability Over The Andes., Jonathan R. Pugmire, Neal Criddle, Michael J. Taylor, Dominique Pautet, Yucheng Zhao 2010 Utah State University

The First Ten Months Of Investigation Of Gravity Waves And Temperature Variability Over The Andes., Jonathan R. Pugmire, Neal Criddle, Michael J. Taylor, Dominique Pautet, Yucheng Zhao

Neal R Criddle

The Andes region is an excellent natural laboratory for investigating gravity wave influences on the Upper Mesospheric and Lower Thermospheric (MLT) dynamics: during the summer months the dominant gravity waves result from deep convection arising from severe thunderstorms over the continent to the east. In winter this convective activity is expected to be replaced by strong orographic forcing due to intense prevailing zonal winds blowing eastward from the Pacific Ocean and suddenly encountering the towering Andes mountain range (6000m). This creates large amplitude mountain waves that have been measured well into the stratosphere and most recently penetration occasionally into the ...


The First Ten Months Of Investigation Of Gravity Waves And Temperature Variability Over The Andes., Jonathan R. Pugmire, Neal Criddle, Michael J. Taylor, Dominique Pautet, Yucheng Zhao 2010 Utah State University

The First Ten Months Of Investigation Of Gravity Waves And Temperature Variability Over The Andes., Jonathan R. Pugmire, Neal Criddle, Michael J. Taylor, Dominique Pautet, Yucheng Zhao

Pierre-Dominique Pautet

The Andes region is an excellent natural laboratory for investigating gravity wave influences on the Upper Mesospheric and Lower Thermospheric (MLT) dynamics: during the summer months the dominant gravity waves result from deep convection arising from severe thunderstorms over the continent to the east. In winter this convective activity is expected to be replaced by strong orographic forcing due to intense prevailing zonal winds blowing eastward from the Pacific Ocean and suddenly encountering the towering Andes mountain range (6000m). This creates large amplitude mountain waves that have been measured well into the stratosphere and most recently penetration occasionally into the ...


Evidence Of Nitric Acid Uptake In Warm Cirrus Anvil Clouds During The Nasa Tc4 Campaign, Eric Scheuer, Jack E. Dibb, Cynthia Twohy, David Rogers, Andrew J. Heymsfield, Aaron Bansemer 2010 University of New Hampshire - Main Campus

Evidence Of Nitric Acid Uptake In Warm Cirrus Anvil Clouds During The Nasa Tc4 Campaign, Eric Scheuer, Jack E. Dibb, Cynthia Twohy, David Rogers, Andrew J. Heymsfield, Aaron Bansemer

Earth Sciences Scholarship

Uptake of HNO3 onto cirrus ice may play an important role in tropospheric NOx cycling. Discrepancies between modeled and in situ measurements of gas-phase HNO3 in the troposphere suggest that redistribution and removal mechanisms by cirrus ice have been poorly constrained. Limited in situ measurements have provided somewhat differing results and are not fully compatible with theory developed from laboratory studies. We present new airborne measurements of HNO3 in cirrus clouds from anvil outflow made during the Tropical Composition, Cloud, and Climate Coupling Experiment (TC4). Upper tropospheric (>9 km) measurements made during three flights while repeatedly traversing the same cloud ...


Convective Distribution Of Tropospheric Ozone And Tracers In The Central American Itcz Region: Evidence From Observations During Tc4, M A. Avery, Cynthia Twohy, David McCabe, J Joiner, Kurt Severance, E L. Atlas, D R. Blake, T P. Bui, John D. Crounse, Jack E. Dibb, Glenn Diskin, Paul Lawson, Matthew McGill, David Rogers, G W. Sachse, Eric Scheuer, A M. Thompson, Charles Trepte, Paul Wennberg, Jerald Ziemke 2010 NASA

Convective Distribution Of Tropospheric Ozone And Tracers In The Central American Itcz Region: Evidence From Observations During Tc4, M A. Avery, Cynthia Twohy, David Mccabe, J Joiner, Kurt Severance, E L. Atlas, D R. Blake, T P. Bui, John D. Crounse, Jack E. Dibb, Glenn Diskin, Paul Lawson, Matthew Mcgill, David Rogers, G W. Sachse, Eric Scheuer, A M. Thompson, Charles Trepte, Paul Wennberg, Jerald Ziemke

Earth Sciences Scholarship

During the Tropical Composition, Clouds and Climate Coupling (TC4) experiment that occurred in July and August of 2007, extensive sampling of active convection in the ITCZ region near Central America was performed from multiple aircraft and satellite sensors. As part of a sampling strategy designed to study cloud processes, the NASA ER‐2, WB‐57 and DC‐8 flew in stacked “racetrack patterns” in convective cells. On July 24, 2007, the ER‐2 and DC‐8 probed an actively developing storm and the DC‐8 was hit by lightning. Case studies of this flight, and of convective outflow on August ...


Reduction Of Rocket-Borne Atmospheric Density Measurements Using Monte Carlo Simulation, Travis Gaulden 2010 Clemson University

Reduction Of Rocket-Borne Atmospheric Density Measurements Using Monte Carlo Simulation, Travis Gaulden

All Theses

The HEX II atmospheric rocket experiment, conducted near 9:30 U.T. February 14, 2007 from the Poker Flat Rocket Range in Alaska was designed to lead to a better understanding of density and velocity gradients in the lower thermosphere. In a supporting role to this mission, cold cathode ionization gauges recorded composite density along three rocket payload trajectory paths from 90 km to 200 km. Rocket-borne instruments experience near sonic to hypersonic velocities and encounter a range of viscous, slipflow, and collisionless flow conditions at these heights. These variable conditions necessitate the use of tailored analytic expressions appropriate to ...


Investigating Time-Scale Effects On Reference Evapotranspiration From Epan Data In North China, Yi Li, Robert Horton, Tusheng Ren, Chunyan Chen 2010 Northwest Agriculture and Foresty Sci-Tech University

Investigating Time-Scale Effects On Reference Evapotranspiration From Epan Data In North China, Yi Li, Robert Horton, Tusheng Ren, Chunyan Chen

Agronomy Publications

Reference evapotranspiration (ETo) and pan evaporation (Epan) are key parameters in hydrological and meteorological studies. The authors’ objectives were to evaluate the ratio of ETo to Epan (kp) at daily and monthly scales and to predict average ETo in the following years using calibrated kp and observed Epan at the two time scales. Using 50 yr of data obtained at six typical sites in north China, daily and monthly ETo were calculated using the Food and Agriculture Organization estimation method (FAO-56) Penman–Monteith equation, and kp values were determined at ...


An Empirical Model Of Thermal Updrafts Using Data Obtained From A Manned Glider, Christopher E. Childress 2010 University of Tennessee - Knoxville

An Empirical Model Of Thermal Updrafts Using Data Obtained From A Manned Glider, Christopher E. Childress

Masters Theses

Various methods have been used, including airborne radars, LIDAR, observation of flying birds, towers, tethered balloons, and aircraft to gain both a qualitative and quantitative representation of how heat and moisture are transported to higher altitudes and grow the boundary or mixing layer by thermal updrafts. This paper builds upon that research using an instrumented glider to determine the structure and build a mathematical model of thermals in a desert environment. During these flights, it was discovered that the traditional view of a thermal as a singular rising plume of air did not sufficiently explain what was being observed, but ...


Investigating Small-Scale Dynamical Features In The Mesopause Region, Deepak B. Simkhada 2010 Utah State University

Investigating Small-Scale Dynamical Features In The Mesopause Region, Deepak B. Simkhada

All Graduate Theses and Dissertations

Utilizing analyses of observational data, we performed a detailed study to investigate short-period atmospheric gravity waves and ripples, and instabilities in the mesopause region. Recent coordinated measurements from Haleakala Observatory, Maui, HI via airglow wave imaging, meteor wind radar, and Na wind temperature lidar have provided a unique dataset for this study. Gravity waves generated in the lower atmosphere propagate energy upwards into the mesosphere and lower thermosphere region where they modulate the airglow emissions, and later break and deposit their momentum, causing significant perturbations in winds and temperatures. Ripples, on the other hand, are likely generated by localized shear ...


Intercomparison Of Prism And Daymet Temperature Interpolation From 1980 To 2003, Rebecca A. Scully 2010 Utah State University

Intercomparison Of Prism And Daymet Temperature Interpolation From 1980 To 2003, Rebecca A. Scully

All Graduate Theses and Dissertations

As ecosystem modeling becomes increasingly integrated with Geographic Information Systems (GIS) there is a rise in demand for spatially and temporally continuous meteorological data. But in order to justify management decisions or to provide robust scientific insights, the accuracy of meteorological data used as model input must be thoroughly quantified. Current methods to create spatially continuous climate data from discrete weather station data include inverse distance weighting, geostatistical techniques such as kriging and splines, local regression models such as Parameter-Elevation Regression on Independent Slope Model (PRISM) and Daymet, and regional regression models. For the conterminous United States, PRISM and Daymet ...


Field And Smog Chamber Studies Of Agricultural Emissions And Reaction Products, Derek J. Price 2010 Utah State University

Field And Smog Chamber Studies Of Agricultural Emissions And Reaction Products, Derek J. Price

All Graduate Theses and Dissertations

Agricultural emissions are an important contributor to atmospheric aerosol. These emissions include nitrogen containing organic compounds, primarily as amines, which have not been well investigated to date. Although there have been several studies that have looked at the emission of gas phase amines, there are only a few studies that have focused on ambient amine-based aerosol. There have also only been a handful of smog chamber studies that have investigated amine aerosol chemistry. Kinetic studies have looked at the reactions of amines with OH and ozone. However, amine reactions with nitrate radical (NO3) are not well understood. Several years of ...


Impact Of Mineral Dust On Nitrate, Sulfate, And Ozone In Transpacific Asian Pollution Plumes, T D. Fairlie, D J. Jacob, Jack E. Dibb, B Alexander, M A. Avery, Aaron van Donkelaar, L Zhang 2010 Harvard University

Impact Of Mineral Dust On Nitrate, Sulfate, And Ozone In Transpacific Asian Pollution Plumes, T D. Fairlie, D J. Jacob, Jack E. Dibb, B Alexander, M A. Avery, Aaron Van Donkelaar, L Zhang

Earth Sciences Scholarship

We use a 3-D global chemical transport model (GEOS-Chem) to interpret aircraft observations of nitrate and sulfate partitioning in transpacific dust plumes during the INTEX-B campaign of April–May 2006. The model includes explicit transport of size-resolved mineral dust and its alkalinity, nitrate, and sulfate content. The observations show that particulate nitrate is primarily associated with dust, sulfate is primarily associated with ammonium, and Asian dust remains alkaline across the Pacific. This can be reproduced in the model by using a reactive uptake coefficient for HNO3 on dust (γ(HNO3) ~10−3) much lower than commonly assumed in ...


Spatial Variabilities And Their Relationships Of The Trends Of Temperature, Water Vapor, And Precipitation In The North American Regional Reanalysis, Er Lu, Eugene S. Takle 2010 Iowa State University

Spatial Variabilities And Their Relationships Of The Trends Of Temperature, Water Vapor, And Precipitation In The North American Regional Reanalysis, Er Lu, Eugene S. Takle

Geological and Atmospheric Sciences Publications

[1] Spatial variabilities and their relationships of the trends of temperature, water vapor, and precipitation in the North American Regional Reanalysis are examined for each season from March 1979 to February 2007. Results show that warming dominates the domain in the troposphere from the surface to 300 hPa. Water vapor increases at lower levels but does not change much at mid-upper levels. Because of the large increase of water vapor holding capacity of the air at all levels due to the warming, relative humidity has a decreasing trend at all levels. The decrease is small at the surface and largest ...


A Balloon Sounding Technique For Measuring So2 Plumes, Gary A. Morris, Walter D. Komhyr, Jun Hirokawa, James Flynn, Barry Lefer, Nicholay Krotokov, Fong Ngan 2010 Valparaiso University

A Balloon Sounding Technique For Measuring So2 Plumes, Gary A. Morris, Walter D. Komhyr, Jun Hirokawa, James Flynn, Barry Lefer, Nicholay Krotokov, Fong Ngan

Physics and Astronomy Faculty Publications

This paper reports on the development of a new technique for inexpensive measurements of SO2 profiles using a modified dual-ozonesonde instrument payload. The presence of SO2 interferes with the standard electrochemical cell (ECC) ozonesonde measurement, resulting in –1 molecule of O3 reported for each molecule of SO2 present (provided [O3].[SO2]). In laboratory tests, an SO2 filter made with CrO3 placed on the inlet side of the sonde removes nearly 100% of the SO2 present for concentrations up to 60 ppbv and remained effective after exposure to 2.8 3 1016 molecules of SO2 [equivalent to a column ;150 DU ...


Model Estimates Of Net Primary Productivity, Evapotranspiration, And Water Use Efficiency In The Terrestrial Ecosystems Of The Southern United States During 1895–2007, Hanqin Tian, Guangsheng Chen, Mingliang Liu, Chi Zhang, Ge Sun, Chaoqun (Crystal) Lu, Xiaofeng Xu, Wei Ren, Shufen Pan, Arthur Chappelka 2010 Iowa State University

Model Estimates Of Net Primary Productivity, Evapotranspiration, And Water Use Efficiency In The Terrestrial Ecosystems Of The Southern United States During 1895–2007, Hanqin Tian, Guangsheng Chen, Mingliang Liu, Chi Zhang, Ge Sun, Chaoqun (Crystal) Lu, Xiaofeng Xu, Wei Ren, Shufen Pan, Arthur Chappelka

Chaoqun (Crystal) Lu

The effects of global change on ecosystem productivity and water resources in the southern United States (SUS), a traditionally ‘water-rich’ region and the ‘timber basket’ of the country, are not well quantified. We carried out several simulation experiments to quantify ecosystem net primary productivity (NPP), evapotranspiration (ET) and water use efficiency (WUE) (i.e., NPP/ET) in the SUS by employing an integrated process-based ecosystem model (Dynamic Land Ecosystem Model, DLEM). The results indicated that the average ET in the SUS was 710 mm during 1895–2007. As a whole, the annual ET increased and decreased slightly during the first ...


A Regional Scale Modeling Analysis Of Aerosol And Trace Gas Distributions Over The Eastern Pacific During The Intex-B Field Campaign, B Adhikary, Gregory R. Carmichael, S Kulkarni, C Wei, Y Tang, A D'Allura, M Mena-Carrasco, David G. Streets, Q Zhang, R B. Pierce, J Al-Saadi, L K. Emmons, G G. Pfister, M A. Avery, J D. Barrick, D R. Blake, William H. Brune, Robert C. Cohen, Jack E. Dibb, A Fried, B J. Heikes, L Gregory Huey, D W. O'Sullivan, G W. Sachse, R E. Shetter, H B. Singh, T L. Campos, C A. Cantrell, F Flocke, E J. Dunlea, Jose L. Jimenez, Andrew Weinheimer, John D. Crounse, Paul Wennberg, James J. Schauer, E A. Stone, D A. Jaffe, D R. Reidmiller 2010 Kathmandu University

A Regional Scale Modeling Analysis Of Aerosol And Trace Gas Distributions Over The Eastern Pacific During The Intex-B Field Campaign, B Adhikary, Gregory R. Carmichael, S Kulkarni, C Wei, Y Tang, A D'Allura, M Mena-Carrasco, David G. Streets, Q Zhang, R B. Pierce, J Al-Saadi, L K. Emmons, G G. Pfister, M A. Avery, J D. Barrick, D R. Blake, William H. Brune, Robert C. Cohen, Jack E. Dibb, A Fried, B J. Heikes, L Gregory Huey, D W. O'Sullivan, G W. Sachse, R E. Shetter, H B. Singh, T L. Campos, C A. Cantrell, F Flocke, E J. Dunlea, Jose L. Jimenez, Andrew Weinheimer, John D. Crounse, Paul Wennberg, James J. Schauer, E A. Stone, D A. Jaffe, D R. Reidmiller

Earth Sciences Scholarship

The Sulfur Transport and dEposition Model (STEM) is applied to the analysis of observations obtained during the Intercontinental Chemical Transport Experiment-Phase B (INTEX-B), conducted over the eastern Pacific Ocean during spring 2006. Predicted trace gas and aerosol distributions over the Pacific are presented and discussed in terms of transport and source region contributions. Trace species distributions show a strong west (high) to east (low) gradient, with the bulk of the pollutant transport over the central Pacific occurring between ∼20° N and 50° N in the 2-6 km altitude range. These distributions are evaluated in the eastern Pacific by comparison with ...


Design Of A Software Framework Prototype For Scientific Model Interoperability, Eric Fritzinger, Sohei Okamoto 2010 University of Nevada Reno

Design Of A Software Framework Prototype For Scientific Model Interoperability, Eric Fritzinger, Sohei Okamoto

2010 Annual Nevada NSF EPSCoR Climate Change Conference

19 PowerPoint slides Session 2: Infrastructure Convener: Sergiu Dascalu, UNR Abstract: -What are models? -Mathematical models used to describe a system -E.g. Atmospheric, Oceanic, Ecological, etc… -Algorithmic calculations which take input and produce estimated results -Weather forecasting, global warming predictions, sea level estimations, etc… -Models are invaluable


Research Poster: Climate Prediction Downscaling Of Temperature And Precipitation In The Great Basin Region, Ramesh Vellore, Benjamin J. Hatchett, Darko Koracin 2010 Desert Research Institute

Research Poster: Climate Prediction Downscaling Of Temperature And Precipitation In The Great Basin Region, Ramesh Vellore, Benjamin J. Hatchett, Darko Koracin

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster


Research Poster: Measuring The Aerosol Asymmetry Parameter G Instrument Description And Initial Measurements, Guoxun Tian, Hans Moosmuller, W. Patrick Arnott 2010 Desert Research Institute

Research Poster: Measuring The Aerosol Asymmetry Parameter G Instrument Description And Initial Measurements, Guoxun Tian, Hans Moosmuller, W. Patrick Arnott

2010 Annual Nevada NSF EPSCoR Climate Change Conference

Research poster


A Multiscale And Multidisciplinary Investigation Of Ecosystem- Atmosphere Co2 Exchange Over The Rocky Mountains Of Colorado, Jielun Sun, Steven Oncley, Sean Burns, Britton Stephens, Donald Lenschow, Teresa Campos, Russell Monson, David Schimel, William Sacks, Stephan DeWekker, Chun-Ta Lai, Brian Lamb, Dennis Ojima, Patrick Ellsworth, Leonel Sternberg, Sharon Zhong, Craig Clements, David Moore, Dean Anderson, Andrew Watt, Jia Hu, Mark Tschudi, Steven Aulenbach, Eugene Allwine, Teresa Coons 2010 National Center for Atmospheric Research

A Multiscale And Multidisciplinary Investigation Of Ecosystem- Atmosphere Co2 Exchange Over The Rocky Mountains Of Colorado, Jielun Sun, Steven Oncley, Sean Burns, Britton Stephens, Donald Lenschow, Teresa Campos, Russell Monson, David Schimel, William Sacks, Stephan Dewekker, Chun-Ta Lai, Brian Lamb, Dennis Ojima, Patrick Ellsworth, Leonel Sternberg, Sharon Zhong, Craig Clements, David Moore, Dean Anderson, Andrew Watt, Jia Hu, Mark Tschudi, Steven Aulenbach, Eugene Allwine, Teresa Coons

Faculty Publications

A significant fraction of Earth consists of mountainous terrain. However, the question of how to monitor the surface–atmosphere carbon exchange over complex terrain has not been fully explored. This article reports on studies by a team of investigators from U.S. universities and research institutes who carried out a multiscale and multidisciplinary field and modeling investigation of the CO2 exchange between ecosystems and the atmosphere and of CO2 transport over complex mountainous terrain in the Rocky Mountain region of Colorado. The goals of the field campaign, which included ground and airborne in situ and remote-sensing measurements, were to characterize ...


A Multiscale And Multidisciplinary Investigation Of Ecosystem- Atmosphere Co2 Exchange Over The Rocky Mountains Of Colorado, Jielun Sun, Steven P. Oncley, Sean P. Burns, Britton B. Stephens, Donald H. Lenschow, Teresa Campos, Russell K. Monson, David S. Schimel, William J. Sacks, Stephan F.J. DeWekker, Chun-Ta Lai, Brian Lamb, Dennis Ojima, Patrick Z. Ellsworth, Leonel S.L. Sternberg, Sharon Zhong, Craig B. Clements, David J.P. Moore, Dean E. Anderson, Andrew S. Watt, Jia Hu, Mark Tschudi, Steven Aulenbach, Eugene Allwine, Teresa Coons 2010 National Center for Atmospheric Research

A Multiscale And Multidisciplinary Investigation Of Ecosystem- Atmosphere Co2 Exchange Over The Rocky Mountains Of Colorado, Jielun Sun, Steven P. Oncley, Sean P. Burns, Britton B. Stephens, Donald H. Lenschow, Teresa Campos, Russell K. Monson, David S. Schimel, William J. Sacks, Stephan F.J. Dewekker, Chun-Ta Lai, Brian Lamb, Dennis Ojima, Patrick Z. Ellsworth, Leonel S.L. Sternberg, Sharon Zhong, Craig B. Clements, David J.P. Moore, Dean E. Anderson, Andrew S. Watt, Jia Hu, Mark Tschudi, Steven Aulenbach, Eugene Allwine, Teresa Coons

Craig B. Clements

A significant fraction of Earth consists of mountainous terrain. However, the question of how to monitor the surface–atmosphere carbon exchange over complex terrain has not been fully explored. This article reports on studies by a team of investigators from U.S. universities and research institutes who carried out a multiscale and multidisciplinary field and modeling investigation of the CO2 exchange between ecosystems and the atmosphere and of CO2 transport over complex mountainous terrain in the Rocky Mountain region of Colorado. The goals of the field campaign, which included ground and airborne in situ and remote-sensing measurements, were to characterize ...


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