A5032868061- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Climate variability and models
- Hydrology and Drought Analysis
- Air Quality and Health Impacts
- Wind and Air Flow Studies
- Tropical and Extratropical Cyclones Research
- Air Quality Monitoring and Forecasting
- Hydrology and Watershed Management Studies
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Climate change impacts on agriculture
- Plant Water Relations and Carbon Dynamics
- Arctic and Antarctic ice dynamics
- Vehicle emissions and performance
- Coastal wetland ecosystem dynamics
- Urban Heat Island Mitigation
- Coastal and Marine Dynamics
- Radioactivity and Radon Measurements
- Nuclear and radioactivity studies
- Methane Hydrates and Related Phenomena
- Smart Materials for Construction
- Environmental Changes in China
Boulder Environmental Sciences and Technology (United States)
2024
NOAA Physical Sciences Laboratory
2017-2021
National Oceanic and Atmospheric Administration
2004-2020
NOAA Earth System Research Laboratory
2006-2019
University of Colorado Boulder
2003-2019
Physical Sciences (United States)
2016-2019
Cooperative Institute for Research in Environmental Sciences
2003-2010
Colorado State University
2002
Petrochemical industrial facilities can emit large amounts of highly reactive hydrocarbons and NO x to the atmosphere; in summertime, such colocated emissions are shown consistently result rapid efficient ozone (O 3 ) formation downwind. Airborne measurements show initial hydrocarbon reactivity petrochemical source plumes Houston, TX, metropolitan area is primarily due routine alkenes propene ethene. Reported these compounds substantially lower than inferred from sources. Net O rates yields...
A case study from the Texas Air Quality Study 2000 field campaign illustrates complex interaction of meteorological and chemical processes that produced a high-pollution event in Houston area on 30 August 2000. High 1-h ozone concentrations nearly 200 ppb were measured near surface, vertical profile data an airborne differential-absorption lidar (DIAL) system showed these high-ozone penetrated to heights approaching 2 km into atmospheric boundary layer. This deep layer pollution was...
Abstract An analysis of atmospheric rivers (ARs) as defined by an automated AR detection tool based on integrated water vapor transport (IVT) and the connection to heavy precipitation in southeast United States (SEUS) is performed. Climatological fields are compared between U.S. West Coast (WCUS) SEUS, highlighting stronger seasonal variation SEUS IVT WCUS. The climatological suggests that values above ~500 kg m −1 s (as incorporated into objective identification such used here) may serve a...
Abstract International Arctic Systems for Observing the Atmosphere (IASOA) activities and partnerships were initiated as a part of 2007–09 Polar Year (IPY) are expected to continue many decades legacy program. The IASOA focus is on coordinating intensive measurements atmosphere collected in United States, Canada, Russia, Norway, Finland, Greenland create synthesis science that leads an understanding why not just how evolving. premise there limitations with modeling satellite observations can...
Abstract The city of Houston, Texas, is near a complex coastline and numerous petrochemical plants, the combination which plays large role in Houston’s air pollution events. It has long been known that thermally driven afternoon onshore flow (sea breeze or gulf breeze) transports ozone-rich inland. As way quantifying high-ozone events, cluster analysis hourly averaged surface winds from regional network meteorological sensors was performed for 27 summer days 2000, with dates coinciding Texas...
Abstract A Doppler lidar deployed to the center of Great Salt Lake (GSL) basin during Vertical Transport and Mixing (VTMX) field campaign in October 2000 found a diurnal cycle along-basin winds with northerly up-basin flow day southerly down-basin low-level jet at night. The emphasis VTMX was on stable atmospheric processes cold-air pool that formed During night fully as it entered GSL from south. Thus, feature complex string basins draining toward Lake, which included least Utah timing...
The Northern Colorado Front Range (NCFR) has a long history of air pollution problems, which include summertime ozone levels regularly exceeding the National Ambient Air Quality Standard (NAAQS). NCFR been designated as nonattainment area for NAAQS since 2007. Contributing factors to elevated buildup meteorological conditions such mountain-valley thermal forcing that recirculates enriched in volatile organic compound (VOC) emissions from oil and natural gas (O&NG) production other...
Abstract There has been a notable increase in winter and early spring ozone exceedance occurrences enclosed air basins that contain abundant oil natural gas (O&NG) activity. High levels can arise from emissions of nitrogen oxides (NO x ) volatile organic compounds (VOCs) combined with enhanced photochemical reactions. The wintertime temperature inversions trap these near the ground cause their concentrations to increase, high albedo snow accelerates Although events have noted rural...
Time series from two ozone monitoring stations are evaluated, one on an island several km off the New England coast, other inland in Hampshire. In summer of 2002, during Air Quality Study 2002 (NEAQS‐2002), measurements at station, Appledore Island (ADI), were consistently higher than Thompson Farm (TF). We hypothesized that differences concentrations due to transport driven by mesoscale meteorology, since neither site was a source region. found Appalachian Trough, coastal cold fronts and...
Principal Component Analysis (PCA) is used to isolate the common modes of behavior in daily maximum 8‐h average ozone mixing ratios measured at 30 Continuous Ambient Monitoring Stations Houston‐Galveston‐Brazoria area during Second Texas Air Quality Study field intensive (1 August 15 October 2006). Three principal components suffice explain 93% total variance. Nearly 84% explained by first component, which attributed changes “regional background” determined primarily large‐scale winds. The...
Abstract This paper examines the three‐dimensional structure and dynamics of southerly hybrid gap/mountain flow through Wipp valley (Wipptal), Austria, observed on 30 October 1999 using high‐resolution observations model simulations. The were obtained during a shallow south föhn event documented in framework Mesoscale Alpine Programme (MAP). Three important data sources used: airborne differential‐absorption lidar LEANDRE 2, ground‐based Doppler TEACO2 situ measurements from National Oceanic...
Abstract Differences in nighttime transport and diffusion of sulfur hexafluoride (SF6) tracer an urban complex-terrain setting (Salt Lake City, Utah) are investigated using surface Doppler lidar wind data large-scale pressure differences. Interacting scales motion, as studied through the URBAN 2000 field program combined with Vertical Transport Mixing (VTMX) experiment, explained differences behavior during three separate intensive operating periods. With emphasis on stable boundary layer...
This paper investigates linkages between weather, climate, and air quality that contributed to the large difference in number of ozone exceedances encountered northeastern United States (U.S.) during 2002 2004. Major research field campaigns were conducted northeast July August each year. Both New England Air Quality Study (NEAQS‐02) International Consortium for Atmospheric Research on Transport Transformation 2004 study (ICARTT‐04) had components focused regional quality. The primary...
A NOAA/Environmental Technology Laboratory Doppler lidar measured the life cycle of land- and sea-breeze system at Monterey Bay, California, in 1987, during Land–Sea Breeze Experiment (LASBEX). On days with offshore synoptic flow, transition to onshore flow (the sea breeze) was a distinct process easily detected by lidar. Finescale measurements showed reversal from near coast, its gradual vertical horizontal expansion, dual structure early formative stages. Initially, shallow (<500 m) breeze...
Abstract Ground-based Doppler-lidar instrumentation provides atmospheric wind data at dramatically improved accuracies and spatial/temporal resolutions. These capabilities have provided new insights into flow phenomena, but they also should a strong role in NWP model improvement. Insight the nature of errors can be gained by studying recurrent flows, here regional summertime diurnal sea breeze subsequent marine-air intrusion arid interior Oregon–Washington, where these winds are an important...
Many interesting flow patterns were found in the Grand Canyon by a scanning Doppler lidar deployed to south rim during 1990 Wintertime Visibility Study. Three are analyzed this study: 1) reversal canyon, where canyon was opposite direction from above rim; 2) under strong, gusty southwest, inside and similar coupled; 3) light large-scale ambient flow, evidence of local, thermally forced up- down-canyon winds bottom canyon. On days with strongest in-canyon response for northwesterly strong...
Abstract Forecasts by mid-2015 for a strong El Niño during winter 2015/16 presented an exceptional scientific opportunity to accelerate advances in understanding and predictions of extreme climate event its impacts while the was ongoing . Seizing this opportunity, National Oceanic Atmospheric Administration (NOAA) initiated Rapid Response (ENRR), conducting first field campaign obtain intensive atmospheric observations over tropical Pacific Niño. The overarching ENRR goal determine response...
Abstract A critical aspect of the uniqueness coastal drought is effects on salinity dynamics creeks, rivers, and estuaries. The location freshwater–saltwater interface along coast an important factor in ecological socioeconomic communities. Salinity a response variable that integrates hydrologic including sea level, tides, winds, precipitation, streamflow, tropical storms. position determines composition freshwater saltwater aquatic communities as well availability for water intakes. Many...
Airborne radioactivity from fossil fuel production systems is poorly characterized, but a recent study showed elevated ambient levels with proximity to oil and gas wells. Here, we report year-long, high temporal resolution monitoring results of airborne alpha both radon progeny attached particulates immediately northeast an refinery in Commerce City, Colorado, USA, environmental justice community concern. Gas particle-associated contributed nearly evenly the total radioactivity. Total 30–40...
A mesoscale model, a Lagrangian particle dispersion and extensive Doppler lidar wind measurements during the Vertical Transport Mixing (VTMX) 2000 field campaign were used to examine converging flows over Salt Lake valley in Utah their effect on vertical mixing at night morning transition period. The simulated components transformed into radial velocities make direct comparison with about 1.3 million data points evaluate critically spatial variations fields aloft. model captured reasonably...
Abstract A lee-wave–rotor system interacting with an approaching cold front in the lee of Pike’s Peak near Colorado Springs, Colorado, on 1 April 1997 is studied observationally and numerically. Dynamical effects associated caused amplification evolving wave rotor, creating increasingly more hazardous flight conditions for nearby airports. The rapidly winds measured by a Doppler lidar 915-MHz wind profilers, simulated Regional Atmospheric Modeling System (RAMS), produced light-to-moderate...
Horizontal transport is a key factor in air pollution meteorology. In several recent quality field campaigns, networks of wind profiling Doppler radars have been deployed to help characterize this important phenomenon. This paper describes Lagrangian particle trajectory tool developed take advantage the hourly observations provided by these special profiler networks. The uses only observed profiles calculate positions and does not involve any model physics or parameterizations. An...