K µ o ] v Wearthweb.ess.washington.edu/jnt/HolzworthAGU2015.pdf · 9duldwlrq lq 5hjlrqdo dqg...
Transcript of K µ o ] v Wearthweb.ess.washington.edu/jnt/HolzworthAGU2015.pdf · 9duldwlrq lq 5hjlrqdo dqg...
Variation in Regional and Global Lightning
R. H. Holzworth, J. B. Brundell, M. P. McCarthy, K. S. Virts, M. L Hutchins, A. R. Jacobson, S. Heckman
Univ. of Washington, Seattle, WAUltraMSK, Dunedin, New ZealandEarth Networks, Germantown, MD
Virts et al, BAMS, 2013
Outline:Global Lightning Detection: WWLLNENGLNStrokes Clustered into storms• UT variability of Clusters (storms)• Stroke Energy: ocean versus land• Tropical Cyclone online data set• Transient Gamma Flashes• Lightning sferics in the ionosphere and magnetosphere
Strokes(6.5 times increase)(mostly from adding new stations)
Clusters(2.3 times increasefrom 2005 and just )
10 Years WWLLN DATA
Per day
Median Strokes/Cluster : 5Mean Strokes/Cluster: 13 Median Strokes/Cluster : 6Mean Strokes/Cluster: 25
Sample Day in 2005 Sample Day in 2014
Note:Southern Hemisphere Summer (ONDJFM) is lower thanNorthern Hemisphere Summer (AMJJAS)AndContribution from Africa/Europe is relatively larger
Virts et al, BAMS, 2013
Showing strong detection differences for TRMM/LIS and WWLLN over Oceans and over continents
Average Stroke Energy over Ocean versus land
Africa Coast (WWLLN data)
ENTLN data
Sharp Transition –within 10 km pf coast
Hutchins et al, GRL, 2013
USAGI2013(black circles: WWLLN strokes)
WWLLN Strokes +-15min of TRMM passeyewall Rain bands
All TC’s from 2009 to present now on line: contactProfs. Jeremy Thomas or Robert Holzworth
Transient Gamma FlashesMulti-MeV Photons seen by Fermi and RHESSIStroke location and timing from WWLLNConnaughton et al, JGR 2010
Each Point is a lightning stoke location for a whistler seen on CNOFS (>400 km altitude)
Reconvergence
¼ way around the world (10,000 km)
Jacobson et al, Ann. Geophys., 2011
Typical Nose Whistler from Lightning Sfericdetected on Van Allen Probes (EFW and EMFISIS wave instruments)
Summary• Clustered Thunderstorms have clear diurnal variation• Clusters increase slightly in 10 yearsExamples Given of• Sharp stroke energy transition at coast• Stroke variation over Gulf Stream peaks after midnight• High Resolution Tropical Cyclone tracking• Lightning relation to TGF production• Whistler source locations and energy study with RBSP