Table 2. The Lightning Sources Used in This Study and Other Studies


Reference	Scalinga	Lightning Sourceb	Time Period

This study, simulation L0	OTD/LIS	0.16 (240)	1 Jul to 15 Aug 2004
This study, simulation L1	NLDN	0.25 (240)	1 Jul to 15 Aug 2004
This study, simulation L2	NLDN	0.50 (480)	1 Jul to 15 Aug 2004
Hudman et al. [2007, 2009]	no scaling	0.27 (500)	1 Jul to 15 Aug 2004
Jourdain et al. [2010], simulation L0 (base)c	OTD/LIS	0.15 (260)	1 Jul to 15 Aug 2006
Jourdain et al. [2010], simulation L1 (NLDN)c	NLDN	0.21 (260)	1 Jul to 15 Aug 2006
Jourdain et al. [2010], simulation L2 (lighx2)c	NLDN	0.42 (520)	1 Jul to 15 Aug 2006
Allen et al. [2010], simulation L0 (low NOx)	OTD/LIS	0.17 (240)	1 Jul to 15 Aug 2004
Allen et al. [2010], simulation L0 (high NOx)	OTD/LIS	0.34 (480)	1 Jul to 15 Aug 2004

aObserved flash rates used to adjust the model-calculated (different models and lightning schemes) flash rates.
bThe lightning NOx source in Tg N from the contiguous United States and adjacent coastal areas; lightning NO moles produced per flash are in parentheses.
cPlease note the different year (2006). The lightning sources for the period of 1 July to 15 August are estimated by multiplying the lightning source values from July 2006 by a factor of 1.5.