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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 on theme: "The Changing Photochemistry of the North Pacific - Observations of Reactive Nitrogen from INTEX-B 2006 Ron Cohen Tim Bertram Anne Perring Paul Wooldridge."— Presentation transcript:

1 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

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

3 Ozone Production Rates INTEX-A PBL INTEX-B All

4 Thornton et al., Anal. Chem. 2000 UCB LIF on the DC-8 LIF Detection of NO 2 Detection Limit [S/N=2]: 25pptv @10seconds at 12km 10pptv @10seconds on ground

5 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

6 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

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

8 NO y Partitioning: Remote Pacific North South N S

9 15 May 2006 - Anchorage to North Dakota TD-LIF Flight Data

10 15 May 2006 - Anchorage to North Dakota TD-LIF Flight Data

11 15 May 2006 - Anchorage to North Dakota TD-LIF Flight Data

12 15 May 2006 - Anchorage to North Dakota TD-LIF Flight Data

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

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

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

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

17 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

18 PAN Thermal Dissociation: Remote Pacific North South N S

19 In situ constraints for satellite observations of NO 2 from OMI

20

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