HFC-152a 4-hourly mixing ratios normalised by monthly mean HFC-134a

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Presentation transcript:

INTERCONTINENTAL TRANSPORT FROM USA OBSERVED AT THE AGAGE STATION AT MACE HEAD, IRELAND HFC-152a 4-hourly mixing ratios normalised by monthly mean HFC-134a HCFC-141b HCFC-142b AGAGE - GCMS P.G. Simmonds S. O’Doherty 14TH July 2004

BACK-TRACK AIR-MASS TRAJECTORY A. Stohl NILU

ESTIMATED USA EMISSIONS USING RATIOS RELATIVE TO N2O ON 14TH JULY 2004 Thousand tonnes per year HCFC-141b 13 HCFC-142b 19 HFC-152a 9 HFC-134a 40

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