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  • Meteorology and Climatology  (3)
  • Dieback  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Correction of crown disorders ofPinus caribaea var.hondurensis by application of zinc (1982)
    Springer
    Plant and soil 65 (1982), S. 293-296 
    Details
    ISSN: 1573-5036
    Keywords: Crown disorders ; Dieback ; Needleless shoots ; Pinus caribaea var.hondurensis Zn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Trees of a highland provenance ofPinus caribaea var.hondurensis Barr. and Golf. in an unhealthy stand on Melville Is., Australia displaying symptoms of needleless shoots, short needles, premature needle fall, resin exudation from the stem, fasciation of the stem tip tip dieback and multiple leadering were markedly improved by the application of Zn. Other plantings of highland provenances ofP. caribaea var.hondurensis in the lowland tropics with similar disorders may benefit from Zn application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374661
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Characteristics of Thunderstorms and Lightning Flashes Which Produce Mesospheric Transient Luminous Events (1999)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: A six year record of optical observations of lightning-induced mesospheric transient luminous events (TLEs) is available from the Yucca Ridge Field Station (YRFS) near Ft. Collins, CO. Climatological analyses reveal sprites and elves occur in a variety of convective storm types, but principally mesoscale convective systems (MCSs) and squall lines. Severe supercell storms rarely produce TLEs, except during their dissipating stage. Few TLEs are observed during storms with radar echo areas 〈7,500 sq km. Above this size there is a modest correlation with radar areal coverage. A typical High Plains storm produces 45 TLEs over a 143 interval. Sprites and most elves are associated with +CGs. The probability of a TLE increases with peak current. In six storms, 5.1% of +CGs produced TLEs, the number increasing to 32% of +CGs with 〉75 kA and 52% of +CGs with 〉100 kA peak current.
    Keywords: Meteorology and Climatology
    Type: 11th International Conference on Atmospheric Electricity; 84-87; NASA/CP-1999-209261
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Latitudinal variations of cloud base height and lightning parameters in the tropics (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The observed reduction in cloud-to-ground lightning in the new-equational zone is examined from the perspective of the width of the main negative charge region. Thermodynamic observations of cloud base height also show a climatological minimum value in the near-equatorial region. The association of low cloud base with both narrow updrafts and narrow changing zones may impede the bridging of the large air gap to ground, and thereby suppress cloud-to-ground lightning activity. This width dependence may be more important than the approx. 10% variation in height of the freezing level in the encouraging flashes to ground.
    Keywords: Meteorology and Climatology
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Global Validation of Single-Station Schumann Resonance Lightning Location (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Global measurements of large, optically bright lightning events from the Optical Transient Detector (OTD) satellite are used to validate estimates of lightning location from single-station Schumann resonance (SR) data. Bearing estimates are obtained through conventional magnetic direction-finding techniques, while source range is estimated from the range-dependent impedance spectrum of individual SR transients. An analysis of 40 such transients suggests that single-station techniques can locate lightning globally with an accuracy of 1-2mm. This is confirmed by further validation at close ranges from flashes detected by the National Lightning Detection-Network (NLDN). Observations with both OTD and SR systems may be useful for globally locating lightning with necessary, if not sufficient, characteristics to trigger mesospheric sprites.
    Keywords: Meteorology and Climatology
    Type: Journal of Atmospheric and Solar-Terrestrial Physics (ISSN 0017-9310)
    Format: text
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    NASA TECHNICAL REPORTS
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