A5047405188- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Climate variability and models
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Solar and Space Plasma Dynamics
- Tropical and Extratropical Cyclones Research
- Geomagnetism and Paleomagnetism Studies
- Atmospheric and Environmental Gas Dynamics
- Peatlands and Wetlands Ecology
- Mediterranean and Iberian flora and fauna
- Education and Technology Integration
- Fluid Dynamics and Vibration Analysis
- Hydrology and Watershed Management Studies
- Precipitation Measurement and Analysis
- Climate Change Policy and Economics
- Astro and Planetary Science
- GNSS positioning and interference
- Botany, Ecology, and Taxonomy Studies
- Botany and Plant Ecology Studies
- Geology and Paleoclimatology Research
- demographic modeling and climate adaptation
- Soil Carbon and Nitrogen Dynamics
Northwest Research Associates
2009-2024
Cooperative Institute for Research in Environmental Sciences
1998-2000
University of Colorado Boulder
1998
National Oceanic and Atmospheric Administration
1998
Orographic gravity waves generated by flow over the topography of small islands in southern oceans have been observed from orbit with Atmospheric Infrared Sounder on Aqua satellite. We examine occurrence frequencies these stratosphere at ∼40km above 14 and geographical seasonal changes. Our results show that island mountain occur commonly May–September season, though not every day. Differing variations are evident different islands, closely related to latitude prevailing wind patterns. also...
Abstract. Gravity waves are an important driver for the atmospheric circulation and have substantial impact on weather climate. Satellite instruments offer excellent opportunities to study gravity a global scale. This focuses observations from Atmospheric Infrared Sounder (AIRS) onboard National Aeronautics Space Administration Aqua satellite Sounding Interferometer (IASI) European MetOp satellites. The main aim of this is intercomparison stratospheric wave both instruments. In particular,...
Abstract. Stratospheric gravity waves from small-scale orographic sources are currently not well-represented in general circulation models. This may be a reason why many simulations have difficulty reproducing the dynamical behavior of Southern Hemisphere polar vortex realistic manner. Here we discuss 12-year record (2003–2014) stratospheric wave activity at hotspots as observed by Atmospheric InfraRed Sounder (AIRS) aboard National Aeronautics and Space Administration's (NASA) Aqua...
Abstract Atmospheric gravity waves have a major effect on atmospheric circulation, structure, and stability global scale. Gravity can be generated by convection, but in many cases it is difficult to link convection directly specific wave event. In this research, the authors examine an event 12 January 2003 when convective were clearly period of extremely intense rainfall region Darwin, Australia, during early morning. The observed Infrared Sounder (AIRS) instrument board Aqua satellite, dry...
The depth of the atmospheric boundary layer is interest in several different areas, such as chemistry, pollutant studies, and global modeling. In this research authors describe compare measurements depth. First, use standard measurement from radiosondes to confirm validity wind-profiler measurements, which humidity gradients estimate A method for obtaining meaningful cloud-base altitudes then presented, results are compared heights. find good agreement between types but see that profiler...
This manuscript uses 915-MHz wind profiler reflectivity and Doppler spectral width data in time versus altitude to characterize general behaviors of the ending daytime convective boundary layer. From a wide variety observed patterns, two categories are identified: inversion layer separation (ILS) descent. Several possible causes for different shapes patterns discussed. Results show descent cases occur on relatively warm moist days with weak turbulence capping ILS cooler drier stronger...
This article describes the 1995 and 1996 Flatland boundary layer experiments, known as Flatland95 Flatland96. A number of scientific instrumental objectives were organized around central theme characterization convective layer, especially top entrainment zone. In this authors describe physical setting which took place in area near Atmospheric Observatory, Champaign–Urbana, Illinois, August–September June–August 1996. The site is interesting because it extremely flat, has uniform land use, a...
Convection-generated gravity waves (CGWs) transport momentum and energy, this is a dominant driver of global features Earth’s atmosphere’s general circulation (e.g. the quasi-biennial oscillation, pole-to-pole mesospheric circulation). As CGWs are not generally resolved by weather climate models, their effects on need to be parameterized. However, quality observations GWs spatiotemporally sparse, limiting understanding preventing constraints parameterizations. Convection-permitting or...
A primary objective of the 1995 and 1996 Flatland boundary layer experiments, known as Flatland95 Flatland96, was to measure characterize entrainment at top convective layer. The experiments took place in area near Atmospheric Observatory Champaign‐Urbana, Illinois, August‐September June‐August 1996. site is interesting because it extraordinarily flat, has uniform land use, situated a prime agricultural area. Measurements zone are difficult make due time space scales involved. We will...
Abstract Previous work has shown eastward migrating regions of enhanced temperature variance due to long‐vertical wavelength stratospheric gravity waves that are in sync with intraseasonal precipitation and tropopause wind anomalies associated the Madden‐Julian Oscillation (MJO). Here origin these wave variations is investigated a set idealized wave‐resolving model experiments. The experiments specifically test whether winds act control propagation into stratosphere by critical level...
Gravity waves (GWs) generated by tropical convection are important for the simulation of large-scale atmospheric circulations, example, quasi-biennial oscillation (QBO), and small-scale phenomena like clear-air turbulence. However, these still poses a challenge due to inaccurate representation convection, high computational costs global, cloud-resolving models. Methods combining models with observations needed gain necessary knowledge on GW generation, propagation, dissipation so that we may...
Abstract Convective heating profiles are computed from one month of rainfall rate and cloud-top height measurements using global Tropical Rainfall Measuring Mission infrared products. Estimates the tropical wave response to this mean flow forcing by waves calculated linear nonlinear models. With a spectral resolution up zonal wavenumber 80 frequency 4 cpd, model produces 50%–70% wind acceleration required drive quasi-biennial oscillation (QBO). The sensitivity spectrum assumed shape profile,...
Using an idealized model framework with high-frequency tropical latent heating variability derived from global satellite observations of precipitation and clouds, the authors examine properties effects gravity waves in lower stratosphere, contrasting conditions El Niño year a La Niña year. The generates broad spectrum including planetary-scale through mesoscale waves. compare modeled monthly mean regional variations wind temperature reanalyses validate using satellite- balloon-based...
Abstract. Stratospheric gravity waves from small-scale orographic sources are currently not well-represented in general circulation models. This may be a reason why many simulations have difficulty reproducing the dynamical behaviour of southern hemisphere polar vortex realistic manner. Here we discuss 12-year record (2003–2014) stratospheric wave activity at hotspots as observed by Atmospheric InfraRed Sounder (AIRS) aboard National Aeronautics and Space Administration's (NASA's) Aqua...
Abstract. Gravity waves are an important driver for the atmospheric circulation and have substantial impact on weather climate. Satellite instruments offer excellent opportunities to study gravity a global scale. This focuses observations from Atmospheric Infrared Sounder (AIRS) onboard National Aeronautics Space Administration's Aqua satellite Sounding Interferometer (IASI) European MetOp satellites. The main aim of this is intercomparison stratospheric wave both instruments. In particular,...
Nan Rosenbloom Timothy G.F. Kittel To accompany CDROM and World Wide Web versions of: THE VEMAP PHASE I DATABASE: AN INTEGRATED INPUT DATASET FOR ECOSYSTEM AND VEGETATION MODELING CONTERMINOUS UNITED STATES T.G.F. Kittel, N.A. Rosenbloom, T.H. Painter, D.S. Schimel, H.H. Fisher, A. Grimsdell, Participants, C. Daly, E.R. Hunt, Jr. Ecosystem Dynamics the Atmosphere Section Climate Global Division National Center for Atmospheric Research System Modeling Program University Corporation
Abstract Convection‐generated gravity waves (CGWs) transport momentum and energy, this is a dominant driver of global features Earth's atmosphere's general circulation (e.g., the quasi‐biennial oscillation, pole‐to‐pole mesospheric circulation). As CGWs are not generally resolved by weather climate models, their effects on need to be parameterized. However, quality observations GWs spatiotemporally sparse, limiting understanding preventing constraints parameterizations. Convection‐permitting...