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  • Other Sources  (5)
  • Meteorology and Climatology; Geophysics  (2)
  • Computer Programming and Software  (1)
  • Environment Pollution  (1)
  • Geophysics  (1)
  • 1
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    Global Lightning Nitrogen Oxides Production (2014)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: No abstract available
    Keywords: Meteorology and Climatology; Geophysics
    Type: M13-3063
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Mathematical Inversion of Lightning Data: Techniques and Applications (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: A survey of some interesting mathematical inversion studies dealing with radio, optical, and electrostatic measurements of lightning are presented. A discussion of why NASA is interested in lightning, what specific physical properties of lightning are retrieved, and what mathematical techniques are used to perform the retrievals are discussed. In particular, a relatively new multi-station VHF time-of-arrival (TOA) antenna network is now on-line in Northern Alabama and will be discussed. The network, called the Lightning Mapping Array (LMA), employs GPS timing and detects VHF radiation from discrete segments (effectively point emitters) that comprise the channel of lightning strokes within cloud and ground flashes. The LMA supports on-going ground-validation activities of the low Earth orbiting Lightning Imaging Sensor (LIS) satellite developed at NASA Marshall Space Flight Center (MSFC) in Huntsville, Alabama. The LMA also provides detailed studies of the distribution and evolution of thunderstorms and lightning in the Tennessee Valley, and offers interesting comparisons with other meteorological/geophysical datasets. In order to take full advantage of these benefits, it is essential that the LMA channel mapping accuracy (in both space and time) be fully characterized and optimized. A new channel mapping retrieval algorithm is introduced for this purpose. To characterize the spatial distribution of retrieval errors, the algorithm has been applied to analyze literally tens of millions of computer-simulated lightning VHF point sources that have been placed at various ranges, azimuths, and altitudes relative to the LMA network. Statistical results are conveniently summarized in high-resolution, color-coded, error maps.
    Keywords: Computer Programming and Software
    Format: text
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  • 3
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    Estimates of the Lightning NOx Profile in the Vicinity of the North Alabama Lightning Mapping Array (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The NASA Marshall Space Flight Center Lightning Nitrogen Oxides Model (LNOM) is applied to August 2006 North Alabama Lightning Mapping Array (NALMA) data to estimate the (unmixed and otherwise environmentally unmodified) vertical source profile of lightning nitrogen oxides, NOx = NO + NO2. Data from the National Lightning Detection Network (Trademark) (NLDN) is also employed. This is part of a larger effort aimed at building a more realistic lightning NOx emissions inventory for use by the U.S. Environmental Protection Agency (EPA) Community Multiscale Air Quality (CMAQ) modeling system. Overall, special attention is given to several important lightning variables including: the frequency and geographical distribution of lightning in the vicinity of the NALMA network, lightning type (ground or cloud flash), lightning channel length, channel altitude, channel peak current, and the number of strokes per flash. Laboratory spark chamber results from the literature are used to convert 1-meter channel segments (that are located at a particular known altitude; i.e., air density) to NOx concentration. The resulting lightning NOx source profiles are discussed.
    Keywords: Environment Pollution
    Type: M10-0569 , M10-0443 , 21st International Lightning Detection Conference (ILDC)/Vaisala; Apr 18, 2010 - Apr 22, 2010; Orlando, FL; United States
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  • 4
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    Ozone Lidar Observations for Air Quality Studies (2015)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: Tropospheric ozone lidars are well suited to measuring the high spatio-temporal variability of this important trace gas. Furthermore, lidar measurements in conjunction with balloon soundings, aircraft, and satellite observations provide substantial information about a variety of atmospheric chemical and physical processes. Examples of processes elucidated by ozone-lidar measurements are presented, and modeling studies using WRF-Chem, RAQMS, and DALES/LES models illustrate our current understanding and shortcomings of these processes.
    Keywords: Geophysics
    Type: MSFC-E-DAA-TN26418 , International Workshop on Air Quality Forecasting Research; Sep 01, 2015 - Sep 03, 2015; College Park, MD; United States
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  • 5
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    Correlation of DIAL Ozone Observations with Lightning (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The purpose of this project is to see whether ozone maxima measured by the DIfferential Absorption Lidar (DIAL) instrument in Huntsville, AL may be traced back to lightning events occurring 24 48 hours beforehand. The methodology is to start with lidar measurements of ozone from DIAL as well as ozonesonde measurements. The HYbrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model is then used to determine the origin of these ozone maxima 2448 hours prior. Data from the National Lightning Detection Network (NLDN) are used to examine the presence/absence of lightning along the trajectory. This type of analysis suggests that lightningproduced NOx may be responsible for some of the ozone maxima over Huntsville.
    Keywords: Meteorology and Climatology; Geophysics
    Type: M13-2904 , 2013 American Geophysical Union (AGU) Fall Meeting; Dec 09, 2013 - Dec 13, 2013; San Francisco, CA; United States
    Format: application/pdf
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