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SUMMARY:Snowpack nitrate photolysis drives the summertime atmospheric nitr
 ous acid (HONO) budget in coastal Antarctica - Millie Bond\, British Antar
 ctic Survey
DTSTART:20230606T130000Z
DTEND:20230606T140000Z
UID:TALK201268@talks.cam.ac.uk
CONTACT:Vichawan (Print) Sakulsupich
DESCRIPTION:In the polar regions\, the usual OH radical formation pathway 
 (ozone photolysis and reaction of O(1D) with H2O) is limited by the low wa
 ter vapour concentration. However\, gases emitted from the snowpack can be
  pre-cursors of HOx radicals and ozone\, thereby controlling the oxidising
  capacity of the lower atmosphere above remote snow-covered regions. One s
 uch gas is nitrous acid (HONO) which is photolyzed to produce OH. Previous
  studies of HONO in the polar boundary layer and snowpack interstitial air
  suggest a photolytic snowpack source but the exact mechanism for HONO pro
 duction is poorly understood\; photochemical models of HONO sources and si
 nks often cannot be reconciled with the measured HONO concentrations. We i
 nvestigated the net HONO flux density above snow in the Clean Air Sector a
 t Halley VI Research Station in coastal Antarctica during austral summer 2
 021-22. Amount fraction measurements of HONO in ambient air will be presen
 ted\, as well as measurements of the HONO flux density between the snow an
 d atmosphere. The potential snowpack reactions driving this HONO release\,
  and the implications of these measurements for the HOx budget\, will be d
 iscussed. These findings help further our understanding of the atmospheric
  budget of reactive nitrogen and highlight the significant effects snow su
 rfaces can have on the atmospheric chemistry in the boundary layer above.\
 n\n\n-------------------------------------------\n\nTopic: CAS Seminar: Am
 elia Bond\, 6 June (2:00 PM)\nTime: Jun 6\, 2023 02:00 PM London\n\nJoin Z
 oom Meeting\nhttps://us02web.zoom.us/j/81374421855?pwd=bHdnVmxxTUlyL3lzTlp
 iVTRmZWtIQT09\n\nMeeting ID: 813 7442 1855\n\nPasscode: 397514
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Zoom https://us02we
 b.zoom.us/j/81374421855?pwd=bHdnVmxxTUlyL3lzTlpiVTRmZWtIQT09
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