A5059933104- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Plant Water Relations and Carbon Dynamics
- Climate change and permafrost
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Calibration and Measurement Techniques
- Climate variability and models
- Air Quality Monitoring and Forecasting
- Tree-ring climate responses
- Wind and Air Flow Studies
- Methane Hydrates and Related Phenomena
- Interdisciplinary Research and Collaboration
- Fire effects on ecosystems
- Peatlands and Wetlands Ecology
- Air Quality and Health Impacts
- Soil and Unsaturated Flow
- Smart Materials for Construction
- Vehicle emissions and performance
- Spectroscopy and Laser Applications
- Indigenous and Place-Based Education
- Service-Learning and Community Engagement
- Groundwater flow and contamination studies
University of Alaska Fairbanks
2015-2024
Earth Science Institute of the Slovak Academy of Sciences
2019
Consejo Nacional de Investigaciones Científicas y Técnicas
2002-2013
Centro Científico Tecnológico - Tucumán
2013
Institute of Scientific and Technical Research for Defense
2002
École Polytechnique
2001
The Alaskan Layered Pollution And Chemical Analysis (ALPACA) field experiment was a collaborative study designed to improve understanding of pollution sources and chemical processes during winter (cold climate low-photochemical activity), investigate indoor pollution, dispersion as affected by frequent temperature inversions. A number the research goals were motivated questions raised residents Fairbanks, Alaska, where held. This paper describes measurement strategies conditions encountered...
Abstract The computation of turbulent fluxes heat, momentum, and greenhouse gases requires measurements taken at high sampling frequencies. An important step in this process involves the detection removal sudden, short-lived variations that do not represent physical processes contaminate data (i.e., spikes). objective study is to assess performance several noteworthy despiking methodologies order provide a benchmark assessment recommendation most applicable high-frequency micrometeorological...
Abstract The high-latitude winter atmospheric boundary layer of interior Alaska continually exhibits a complex layered structure as result extreme meteorological conditions. In this paper the occurrence elevated inversions (EI), surface-based (SBI), and stratified layers in sub-Arctic from January 2000 to December 2009 is reported. This statistical analysis based on radiosonde observation data Fairbanks National Weather Service station complemented by Winter Boundary Layer Experiment...
Abstract. Electrochemical gas sensors (EGSs) have been used to measure the surface distributions and vertical profiles of trace gases in wintertime Arctic boundary layer during Alaskan Layered Pollution Chemical Analysis (ALPACA) field experiment Fairbanks, Alaska, January–February 2022. The MICRO for MEasurements GASes (MICROMEGAS) instrument set up with CO, NO, NO2, O3 EGSs was operated on ground at an outdoor reference site downtown Fairbanks calibration, while board a vehicle moving...
Abstract. Temperature sounding of the atmospheric boundary layer (ABL) and lower troposphere exhibits multilayered temperature inversions specially in high latitudes during extreme winters. These inversion layers are originated based on combined forcing local- large-scale synoptic meteorology. At local scale, thermal forms near surface plays a central role controlling radiative cooling air pollution dispersion; however, depending upon meteorological forcing, an upper level can also exist...
© 2018 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).CORRESPONDING AUTHOR: James R. Campbell, james.campbell@nrlmry.navy.mil
Abstract Cirrus cloud daytime top-of-the-atmosphere radiative forcing (TOA CRF) is estimated for a 2-yr NASA Micro-Pulse Lidar Network (532 nm; MPLNET) dataset collected at Fairbanks, Alaska. Two-year-averaged TOA CRF to be between −1.08 and 0.78 W·m −2 (from −0.49 1.10 in 2017, from −1.67 0.47 2018). This subarctic study completes now trilogy of MPLNET ground-based investigations, following midlatitude tropical studies by Campbell et al. Greenbelt, Maryland, Lolli Singapore. hypothesize...
Abstract High latitudes are experiencing intense ecosystem changes with climate warming. The underlying methane (CH 4 ) cycling dynamics remain unresolved, despite its crucial climatic feedback. Atmospheric CH emissions heterogeneous, resulting from local geochemical drivers, global factors, and microbial production/consumption balance. Holistic studies mandatory to capture complexity. Here, we report a large set of integrated biogeochemical data 387 samples, using concerted sampling...
Abstract. Dinitrogen pentoxide, N2O5, is an important nighttime intermediate in the oxidation of NOx that hydrolysed on surfaces. We conducted a field campaign Fairbanks, Alaska during November 2009 to measure gradient and derive flux (and deposition velocity) N2O5 depositing snowpack using aerodynamic method. The velocity under Arctic winter conditions was found be 0.59 ± 0.47 cm s−1, which first measurement this parameter our knowledge. Based measured velocity, we compared chemical loss...
Abstract Melt from debris‐covered glaciers represents a regionally important freshwater source, especially in high‐relief settings as found central Asia, Alaska, and South America. Sub‐debris melt is traditionally predicted surface energy balance models that determine heat conduction through the supraglacial debris layer. Convection rarely addressed, despite porous nature of debris. Here we provide first constraints on convection debris, development novel method to calculate individual...
Arctic Region Super Computing Center, Geophysical Institute, and Alaska Volcano Observatory, University of Fairbanks, AlaskaInternational Research AlaskaGeophysical AlaskaNorwegian Institute for Air Research, Kjeller, NorwayPacific Northwest National Laboratory, Richmond, WashingtonNational Information Communications Technology, Kogenai, Tokyo, JapanCORRESPONDING AUTHOR: Peter W. Webley, 909 Koyukuk Drive, A K 99775, E-mail: pwebley@gi.alaska.edu
Abstract. Electrochemical gas sensors (EGSs) have been used to measure the surface distributions and vertical profiles of trace gases in wintertime Arctic Boundary Layer during Alaskan Layered Pollution Chemical Analysis (ALPACA) field experiment Fairbanks, Alaska January–February 2022. The MICRO for MEasurements GASes (MICROMEGAS) instrument set up with CO, NO, NO2 O3 EGSs was operated on ground at an outdoor reference site downtown Fairbanks calibration, onboard a vehicle moving through...
Accelerations in the flow over forests generate coherent structures which locally enhance updrafts and downdrafts, forcing rapid exchanges of energy matter. Here, observations turbulent are made a highly heterogeneous black spruce boreal forest Fairbanks, Alaska at ~2.6 h (12 m) ~0.6 (3 m), where is mean canopy height 4.7 m. Wavelet analysis used to detect structures. The sonic temperature wind data cover 864 half‐hour periods spanning winter, spring, summer. When global statistics analyzed...
Abstract Methane‐cycling is becoming more important in high‐latitude ecosystems as global warming makes permafrost organic carbon increasingly available. We explored 387 samples from three high‐latitudes regions (Siberia, Alaska and Patagonia) focusing on mineral/organic soils (wetlands, peatlands, forest), lake/pond sediment water. Physicochemical, climatic geographic variables were integrated with 16S rDNA amplicon sequences to determine the structure of overall microbial communities...
Abstract We evaluate local differences in thermal regimes and turbulent heat fluxes across the heterogeneous canopy of a black spruce boreal forest on discontinuous permafrost interior Alaska. The data were taken during an intensive observing period summer 2013 from two micrometeorological towers 600 m apart central section forest, one denser (DC) other sparser canopy, but under approximately similar atmospheric boundary layer (ABL) flow conditions. Results suggest that average 34%...
High latitude winter soil CO2 emission is an important component of the annual carbon budget at regional and global scales. Here, continuous monitoring flux-measurement in black spruce forest interior Alaska was performed using non-destructive infrared (NDIR) sensors 10, 20, 30 cm above surface during snow-covered period 2006/7. To analyze effects environmental factors flux, dataset clustered based on major meteorological patterns. Periods were selected atmospheric pressure corresponding to...
As the acreages of agricultural lands increase, changes in surface energetics and evapotranspiration (ET) rates may arise consequently affecting regional climate regimes. The objective this study was to evaluate summertime ET dynamics energy processes a subarctic farm Interior Alaska. includes micrometeorological hydrological data. Results covering period from June September 2012 2013 indicated consistent fractions: LE/Rnet (67%), G/Rnet (6%), H/Rnet (27%) where LE is latent heat flux, Rnet...
Abstract The pre-ALPACA (Alaskan Layered Pollution And Chemical Analysis) 2019 winter campaign took place in Fairbanks, Alaska, November–December 2019. One objective of the was to study life-cycle surface-based temperature inversions and associated surface energy budget changes. Several instruments, including a 4-component radiometer sonic anemometer were deployed open, snow-covered University Alaska Fairbanks (UAF) Campus Agricultural Field. A local flow from connecting valley occurs at...
Abstract. Scintillometer measurements allow for estimations of the refractive index structure parameter Cn2 over large areas in atmospheric surface layer. Turbulent fluxes heat and momentum are inferred through coupled sets equations derived from Monin–Obukhov similarity hypothesis. One-dimensional sensitivity functions have been produced that relate to uncertainties single values beam height flat terrain. However, real field sites include variable topography. We develop here, using...
Recent field campaigns in Alaska and Finland combining situ observations remote sensing are analysed to investigate the components of surface energy budget stable atmospheric boundary layers during Winter Spring. Modulation stability by a local flow Central ALPACA (Alaskan Layered Pollution Chemical Analysis) 2019 2022 is discussed. The representation inversions over boreal forests layer scheme WRF (Weather Research Forecasting) mesoscale model also evaluated. impact mixed phase clouds on...