ARL Weekly News – December 14, 2018

“Weak-constraint inverse modeling using HYSPLIT-4 Lagrangian dispersion model and Cross-Appalachian Tracer Experiment (CAPTEX) observations – effect of including model uncertainties on source term estimation,” authored by Tianfeng Chai, Ariel Stein, and Fong Ngan, was published in Geoscientific Model Development. This paper is available at

Nine ARL HQ scientists gave presentations at the American Geophysical Union’s (AGU) Fall Meeting held December 10-14, 2018 in Washington, D.C. Only ARL co-authors are noted below. For more information, please visit:

  • Patrick Campbell presented “Impacts of sub-grid scale land cover composition in the Model for Prediction Across Scales-Atmosphere (MPAS-A)” in the session on Advances in Understanding Impacts of Land Use and Land Cover Change Using Earth System Models and Data Records I.
  • Tianfeng Chai presented ” Effect of including model uncertainties in HYSPLIT inverse modeling,” co-authored by Ariel Stein and Fong Ngan, during the session on Advances in Data Assimilation, Inverse Modeling, and Forecasting of Trace Gases and Aerosols II.
  • Alice Crawford presented “Modeling Concentrations of Suspended Volcanic Ash,” co-authored by Christopher Loughner and Ariel Stein, during the poster session on Quantitative Volcanic Hazard Assessment and Uncertainty Analysis in Satellite Remote Sensing and Modeling.
  • Hyun Cheol Kim presented “A HYSPLIT-based fire emission inverse modeling system for smoke forecast,” co-authored by Tianfeng Chai and Ariel Stein.
  • Christopher Loughner presented “Incorporation of STILT features into HYSPLIT,” co-authored by Ariel Stein, during the Boundary Layer Processes and Turbulence I poster session.
  • Fong (Fantine) Ngan presented ” Evaluation of turbulent mixing in HYSPLIT using measurements from controlled tracer experiments,” co-authored by Ariel Stein and Christopher Loughner, during the Boundary Layer Processes and Turbulence I poster session.
  • Xinrong Ren presented ” Greenhouse Gas Emissions from New York City Based on Airborne Mass Balance Experiments” during the poster session on Understanding and Attributing Greenhouse Gas Fluxes from Urban Systems and Major Hot Spots I.
  • Ariel Stein presented “NOAA’s HYSPLIT Model: Protecting the Public from Atmospheric Pollutants for Over 30 Years” in NOAA’s booth.
  • Youhua Tang presented ” Development of Events-Driven Chemical Lateral Boundary Conditions (LBC) in Support of NOAA Air Quality Forecast Prediction,” co-authored by Daniel Tong, Barry Baker, Pius Lee, and Ariel Stein, during the poster session Air Quality in the Mid-Atlantic States II.

A paper entitled “Observations and numerical simulation of the effects of the 21 August 2017 North American total solar eclipse on surface conditions and atmospheric boundary-layer evolution,” by Michael S. Buban, Temple R. Lee, Edward J. Dumas, C. Bruce Baker, and Mark Heuer, has been accepted by Boundary-layer Meteorology. Abstract: We present unique observations of a total solar eclipse from a small unmanned aircraft system platform that was operated during the 21 August 2017 North American solar eclipse. Simulations of the eclipse show consistent results with the observations, both in terms of magnitude and timing of the surface and boundary layer evolution. Contact:

ATDD participation in the AGU Fall Meeting:

  • Praveena Krishnan presented a paper entitled Airborne Hyperspectral Imaging to Estimate Vegetation Indices during the Land – Atmosphere Feedback Experiment by Krishnan, P., T. Lee, M. Buban, E. J. Dumas, T. P. Meyers, B. Baker, and S. Brooks in the session: A14A Advances in Optical Remote Sensing of the Atmosphere and Surface II. This oral presentation was on the estimation of vegetation indices using airborne hyperspectral imaging and its comparison with those estimated using airborne multispectral data and tower-based radiation measurements carried out during the Land-Atmosphere Feedback Experiment (LAFE) in August 2017.
  • LaToya Myles presented a poster entitled Measurements of nitrogen and carbon fluxes over coastal salt marsh ecosystem in the northeastern U.S. using eddy covariance systems (Nebila Lichiheb, lead author) during a session on the Bioatmospheric Nitrogen Cycle—Nitrogen Emissions, Transformations, Deposition, and Terrestrial and Aquatic Ecosystem Impacts.
  • LaToya Myles gave a talk entitled Creating and Connecting Champions for Diversity in the Geosciences: Hearts of GOLD during a session on Strategies for More Inclusive Practices Across the Geological Sciences.
  • As a member of the AGU Honors and Recognition Committee, LaToya Myles participated in several H&R events aimed at recognizing scientific achievement and excellence at all levels through AGU Fellows, medals, awards, and prizes.
  • LaToya Myles was featured as a “Scientist-in-Booth” at the NOAA exhibit, where she engaged with meeting attendees and fielded questions about NOAA science.
  • John Kochendorfer presented the results of recent testing of a relative humidity probe both at the NOAA booth and in an oral session on evapotranspiration measurements. The field evaluation of the low cost, fast response humidity probe has demonstrated that the probe can be used to record eddy covariance measurements of water vapor. The long-term goal is to integrate the probe into a fixed wing unmanned aerial system used to measure the exchange of water vapor between the land surface and the atmosphere.