A5033439121- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Atmospheric and Environmental Gas Dynamics
- Solar and Space Plasma Dynamics
- Atmospheric chemistry and aerosols
- Geophysics and Gravity Measurements
- Climate variability and models
- Meteorological Phenomena and Simulations
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Oceanographic and Atmospheric Processes
- GNSS positioning and interference
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Ocean Waves and Remote Sensing
- Arctic and Antarctic ice dynamics
- Air Quality Monitoring and Forecasting
- Methane Hydrates and Related Phenomena
- Space exploration and regulation
- Spaceflight effects on biology
- Sport and Mega-Event Impacts
- Maritime Transport Emissions and Efficiency
- Coastal and Marine Dynamics
- Advanced Glycation End Products research
- Hydrological Forecasting Using AI
United States Naval Research Laboratory
2014-2024
Heliophysics
2021-2024
National Aeronautics and Space Administration
2021
Naval Research Laboratory Space Science Division
2020
Oceanography Society
2014
United States Department of the Navy
2013
United States Navy
2013
University of Arizona
1992-2000
NOAA Climate Prediction Center
1997-1998
Planetary Science Institute
1997
We have studied the mesospheric response to two recent stratospheric warmings by performing short‐term forecasts at medium (1.5°) and high (0.5°) spatial resolution under different gravity wave drag (GWD) scenarios. validated our models with high‐altitude analysis that extends from 0 90 km. For minor warming of January 2008, reduced upper‐level orographic GWD weakened downward residual circulation cooled mesosphere. Parameterized nonorographic increased simulated cooling. prolonged major...
Observations from the Sounding of Atmosphere with Broadband Emission Radiometry (SABER) experiment on NASA/Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite show an unusual vertical displacement winter Arctic stratopause in 2006 zonal mean temperatures at 0.01 hPa (∼78 km) exceeding 250 K. By contrast, conventional location near 0.7 (∼50 km), were unusually cold. Simulations NOGAPS‐ALPHA model suggest that these are coupled to warm disturbed lower stratosphere...
Abstract Among the broad spectrum of vertically propagating tides, migrating diurnal (DW1) and semidiurnal (SW2) are prominent modes energetic dynamical coupling between mesosphere lower thermosphere upper ionosphere. DW1 SW2 tides modulated on time scales ranging from days to years. NASA Thermosphere‐Ionosphere‐Mesosphere Energetic Dynamics (TIMED) is first observational platform perform global synoptic observations these fundamental (for nearly two decades) overcoming previous limitations....
A multiple regression statistical model is applied to investigate the existence of upper-stratospheric ozone, temperature, and zonal wind responses long-term (solar cycle) changes in solar ultraviolet radiation using 11.5 years reprocessed Nimbus-7 Solar Backscattered Ultraviolet (SBUV) data 12.4 National Meteorological Center (NMC) data. positive cycle variation independently measured ozone temperature occurs with maximum amplitude near low-latitude stratopause. The seasonal coefficients 1...
Abstract. Recent studies have shown that day-to-day variability of the migrating semidiurnal solar (SW2) tide within mesosphere and lower thermosphere (MLT) is a key driver anomalies in thermosphere–ionosphere system. Here, we study both amplitude phase SW2 using meteor radar wind lidar temperature observations at altitudes 75–110 km as well output from Navy Global Environmental Model – High Altitude (NAVGEM-HA), high-altitude meteorological analysis Application new adaptive spectral filter...
Although only 15 years of continuous global satellite data are available, existing measurements consistent with a significant, in‐phase solar cycle variation upper stratospheric ozone and temperature. Here we investigate the latitude seasonal dependences this using (1979–1993) combined backscattered ultraviolet (SBUV) SBUV/2 profile 14 (1980–1995) National Meteorological Center (NMC) temperature analyses. These estimated by applying multiple regression statistical model to monthly zonal mean...
We examine the evolution of quasi 2‐day wave in middle atmosphere during period from 5 January to February 2006 using global synoptic meteorological fields high‐altitude Navy Operational Global Atmospheric Prediction System Advanced Level Physics, High Altitude (NOGAPS‐ALPHA) forecast‐assimilation system. This is characterized by a high level planetary activity Northern Hemisphere (winter) extratropical stratosphere prior sudden stratospheric warming (SSW) on 20 2006. Space‐time spectral...
Abstract The descent of the westerly phase quasi‐biennial oscillation (QBO) in equatorial stratospheric zonal wind was interrupted by development easterlies near 40 hPa (~23 km altitude) early 2016. We use tropical meteorological analyses and temperature to describe detail special circumstances which equatorward‐propagating planetary waves produced this unprecedented disruption QBO. Our findings show that subtropical easterly jet winter lower stratosphere during 2015–2016 anomalously weak...
Abstract Recent advances in developing accurate, physics‐based models of the coupled ionosphere‐thermosphere (CIT) system have now made these an integral part next‐generation space weather prediction capabilities. These produced a better understanding how CIT is affected by variability neutral lower atmosphere. However, impacts on atmospheric over time scales with characteristic periods longer than ~10 days received little attention, despite clear evidence this circulation patterns...
On timescales less than a month, negative (positive) 100 hPa temperature anomalies (deviations from seasonal means) and positive (negative) height at northern midlatitudes are associated with total ozone owing to vertical horizontal advective transport of ozone. We apply linear regression relationships between together observed monthly estimate the component variability that results month‐to‐month differences in transport. At 45°N, this empirical method simulates large part zonal mean over...
We study two processes which may govern interhemispheric differences in the temperature of summertime middle atmosphere. The first is direct radiative effect arising from eccentricity Earth's orbit. second factor difference gravity‐wave filtering due to hemispheric asymmetries mean winds troposphere and lower stratosphere. Using different drag parameterizations a zonal wind climatology, we find greater gravity wave induced acceleration flow southern summer stratosphere, leads weaker upper...
Abstract. The new CHEM2D-Ozone Photochemistry Parameterization (CHEM2D-OPP) for high-altitude numerical weather prediction (NWP) systems and climate models specifies the net ozone photochemical tendency its sensitivity to changes in mixing ratio, temperature overhead column based on calculations from CHEM2D interactive middle atmospheric transport model. We evaluate CHEM2D-OPP performance using both short-term (6-day) long-term (1-year) stratospheric simulations with prototype NOGAPS-ALPHA...
Abstract. The forecast model and three-dimensional variational data assimilation components of the Navy Operational Global Atmospheric Prediction System (NOGAPS) have each been extended into upper stratosphere mesosphere to form an Advanced Level Physics High Altitude (ALPHA) version NOGAPS extending ~100 km. This NOGAPS-ALPHA NWP prototype is used assimilate stratospheric mesospheric temperature from Microwave Limb Sounder (MLS) Sounding Atmosphere using Broadband Emission Radiometry...
We present a case study of the non‐linear interaction between quasi‐two day wave (Q2DW) and migrating diurnal tide based on global synoptic meridional wind fields for January 2006 2008 from high‐altitude data assimilation/forecast system. find large amplitudes, small phase locking Q2DW with cycle during 2006. In amplitudes were much smaller, no evidence locking, while tidal larger than in case. Space‐time spectral analysis reveals an enhancement zonal wavenumber 6 feature case, which can be...
A decadal variation of tropical lower stratospheric ozone and temperature has previously been identified that correlates positively with the 11 year solar activity cycle. However, El Niño–Southern Oscillation (ENSO) also influences temperature. It is therefore legitimate to ask whether quasi‐decadal ENSO variability can contribute this apparent cycle variation, either accidentally because short measurement record or physically affects ENSO. Here we present multiple regression analyses...
A variety of spaceborne experiments have observed polar mesospheric clouds (PMC) since the late 20th century. Many these are on satellites in Sun‐synchronous orbits and therefore allow observations only at fixed local times (LT). Temperature oscillations over diurnal cycle an important source PMC variability. In order to quantify long‐term natural or anthropogenic changes PMCs, it is essential understand their variation cycle. To this end, we employ a prototype global numerical weather...
Abstract We have explored the sensitivity of thermosphere and ionosphere to dynamical forcing from altitudes near mesopause (~95 km). performed five simulations, all for year 2009, with National Center Atmospheric Research (NCAR)/Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM). Two simulations were driven NCAR Global Scale Wind Model, three used output Advanced Level Physics High Altitude (ALPHA) version Navy's Operational Prediction System (NOGAPS). Use...
Abstract Although sudden stratospheric warming (SSW) is mainly a northern high‐latitude phenomena, there are several reports of concomitant global dynamical response throughout the mesosphere and lower thermosphere. Published based on model simulations so far attributed such variabilities to changes in circulation; however, no clear explanation how all these regions physically connected during SSW events. The present investigation uses wind observations from two ground‐based specular meteor...
Based on 19 years (1979–1998) of NCEP/NCAR reanalyses data and potential vorticity (PV) area diagnostics, we found that in the southern hemisphere (SH) polar vortex has lasted about two weeks longer 1990s than early 1980s northern (NH) four longer. The SH persisted within layer (12–22 km) with almost complete ozone loss, but did not persist at higher altitudes where was depleted. However, NH a broader vertical range limited to ozone‐depletion layer. We show wave activity weakened recent NH,...
Abstract. Two-dimensional radiance maps from Channel 9 (~60–90 hPa) of the Advanced Microwave Sounding Unit (AMSU-A), acquired over southern Scandinavia on 14 January 2003, show plane-wave-like oscillations with a wavelength λh ~400–500 km and peak brightness temperature amplitudes up to 0.9 K. The wave-like pattern is observed in AMSU-A radiances 8 overpasses this region by 4 different satellites, revealing growth disturbance amplitude 00:00 UTC 12:00 change its horizontal structure between...
We investigate the solar cycle modulation of quasi‐biennial oscillation (QBO) in stratospheric zonal winds and its impact on ozone with an updated version zonally averaged CHEM2D middle atmosphere model. find that duration westerly QBO phase at maximum is 3 months shorter than minimum, a more robust result earlier study due to reduced Rayleigh friction drag present The modeled response, determined via multiple linear regression, compared observational estimates from combined Solar...