The Changing Photochemistry of the North Pacific - Observations of Reactive Nitrogen from INTEX-B 2006 Ron Cohen Tim Bertram Anne Perring Paul Wooldridge.

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Presentation transcript:

The Changing Photochemistry of the North Pacific - Observations of Reactive Nitrogen from INTEX-B 2006 Ron Cohen Tim Bertram Anne Perring Paul Wooldridge with contributions from the INTEX science team

Richter et al., Nature 2005 Changing Photochemistry of the North Pacific

Ozone Production Rates INTEX-A PBL INTEX-B All

Thornton et al., Anal. Chem UCB LIF on the DC-8 LIF Detection of NO 2 Detection Limit [S/N=2]: at 12km on ground

XNO 2 + heat  X + NO 2 T< 50CNO 2 (1) T~ 200CN 2 O 5 +RO 2 NO 2 +(1) (2) T~ 300CRONO 2 + (2) (3) T~ 550CHNO 3 + (3) (4) TD-LIF Detection of  PNs,  ANs and HNO 3 Day et al., JGR. 2002

Sample at 4Hz in a 2 minute sampling cycle 90 seconds NO 2 60 seconds  PNs 15 seconds  ANs 30 seconds NO y (-NO)15 seconds HNO 3 TD-LIF Sampling Strategy

NO y = NO + NO 2 +  PNs +  ANs +HNO 3 Reactive Nitrogen & Ozone: Remote Pacific North South N S

NO y Partitioning: Remote Pacific North South N S

15 May Anchorage to North Dakota TD-LIF Flight Data

15 May Anchorage to North Dakota TD-LIF Flight Data

15 May Anchorage to North Dakota TD-LIF Flight Data

15 May Anchorage to North Dakota TD-LIF Flight Data

Expect: [PAN] ~ 0.85 [  PNs] PAN and  PNS

 ANs and C 1 -C 4 ANs  ANs C 1 -C 4 (Blake group)

Comparison to Previous Observations: North Pacific [Latitude > 35N] North

Comparison to Previous Observations: South Pacific [Latitude < 35N] South

Questions and Directions Further intercomparison of satellite and in situ data Use NO 2 /HNO 3 and age of air to explore sources of NO x/y and convective influences Document Intercomparisons of TD-LIF with other airborne measurements during INTEX-B Compare and Contrast modeled composition of  ANs and abundances of individual ANs in INTEX-A, and both phases of INTEX-B Compare observations to previous Pacific Missions

PAN Thermal Dissociation: Remote Pacific North South N S

In situ constraints for satellite observations of NO 2 from OMI