1 / 12

Lightning-Produced Nitrogen Oxides during ACTIVE: what have we learned thus far?

This study examines the production and distribution of lightning-produced nitrogen oxides (NOx) during the ACTIVE campaign, providing insights into the role of tropical storms and monsoon convection. The findings highlight the significance of lightning-NOx in these regions and call for further research.

gwendolynj
Télécharger la présentation

Lightning-Produced Nitrogen Oxides during ACTIVE: what have we learned thus far?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lightning-Produced Nitrogen Oxides during ACTIVE: what have we learned thus far? Lorenzo Labrador, Geraint Vaughan and the ACTIVE team (lorenzo.labrador@manchester.ac.uk) SEAES, University of Manchester.

  2. LINET stroke time series, ACTIVE campaign Total ic cg Mini-monsoon Monsoon Pre-monsoon Monsoon-break MCS Suppressed monsoon

  3. Lightning-produced NOx in Hector storms, pre-monsoon 16/11/2005 Egrett’s altitude profile, NOx, CO and cloud particles 16/11/2005 Egrett’s flight track, LINET lightning strokes Average in-cloud NOx enhancement value = 2.5 ppbv LINET- detected strokes in storm ≥ 10KA = 832 (24.5% of storm’s total)

  4. Lightning-produced NOx in Hector storms, monsoon break 10/02/2002 AE27 Egrett’s altitude profile, NOx, CO and cloud particles 16/11/2005 Egrett’s flight track, LINET lightning strokes Average in-cloud NOx enhancement value = 1.16 ppbv LINET- detected strokes in storm ≥ 10KA = 1188(20.9% of storm’s total)

  5. Lightning-NOx production Fltnox = Χltnox M(N)/M(air) ρair (va – vs) Δx Δz Pltnox = Fltnox/RLINET (RLINET/RLIS)-> Pltnox=Fltnox/RLIS ; GLtNOx =Pltnox x Global flash rate AE04 = Pltnox=Fltnox/RLIS = 1.69 kg(NO) flash-1 AE04 GLtNOx = 2.34 Tg yr-1 AE27 = Pltnox=Fltnox/RLIS = 0.234 kg(NO) flash-1 AE27 GLtNOx = 0.32 Tg yr-1

  6. Lightning-produced NOx in monsoon convection Storm sampled produced only 9 lightning strokes and only 17% of that day’s strokes had been produced by the time the flight ended. So, where did the NOx in the spikes come from? 22/01/2005 Egrett’s flight track, LINET lightning strokes, 00:00-23:59 UTC 22/01/2005 Egrett’s altitude profile, NOx, CO and cloud particles 22/01/2005 Egrett’s flight track, LINET lightning strokes, 00:00-10:00 UTC (end of flight) Average in-cloud NOx enhancement value = 984 ppt Average out-of-cloud NOx enhancement value =720 ppt

  7. 22/01/06; flight AE18’s 5-day backward trajectories AE18’s 3rd NOx spike (741 pptv NOx) AE18’s 7th NOx spike (1570 pptv NOx) 5-day backward-trajectories suggest that airmass sampled may have accrued NOx during transit over convectively-active region

  8. Conclusions • The tropics play a crucial role in the production and redistribution of Lightning-produced NOx • LtNOx production in Hector storms on a par with tropical continental convection elsewhere (Brazil), although further studies are warranted • Lightning-NOX in monsoon convection more significant than previously thought

  9. NO: Vertical profiles

  10. Conclussions

More Related