NCAR (National Center for Atmospheric Research)
ACD (Atmospheric Chemistry Division)

CARI (Community Airborne Research Instrumentation (CARI) Group)

Contact Information:

Email:	david(at)ucar.edu
Address:	1850 Table Mesa Dr. Boulder, CO 80305
Phone:	303-497-1716
Fax:	303-497-1411

Education

BS Physics, University of Colorado, Boulder

Research, Activities and Interests:

In-situ measurements of NO_x, NO_y and O₃

Biomass-burning sources of NO_x and NO_y, transport and chemistry

(Q: What is NOy? A: NOy= [NO, NO₂, NO₃, HNO₄, HONO, R-ONO₂, ClONO₂, BrONO₂, HNO₃ , N₂O₅, and PANs (as PPN + PiBN + MPAN + APAN + PBzN + MoPN)]

Honors:

NASA Group Acheivement Award for CRYSTAL-FACE, INTEX-B missions

Missions:

CRYSTAL-FACE 2002 (Florida & Gulf)

MIRAGE-MILAGRO/ INTEX-B (Mexico City, Seattle & Pacific)

TC-4 (Costa Rica)

ARCTAS (California, Central Canada, Greenland, Arctic & Arctic Ocean)

OASIS (Barrow, Alaska)

Click Here to goto CRYSTAL-FACE data
Click Here to goto CRYSTAL-FACE photos

Publications in progress:

An Isolated, mid-latitude Source for Pyro-Convective Injection Directly Into the Lower Stratosphere.

Transport and Transformations of NOy and Other Species in Pyro-Convection

The Effect of Inlet Aspiration of Aerosol Odd-nitrogen Species on NOy Budget Determination.

Recent Publications:

	D Knapp, B Ridley, A Weinheimer, D Montzka, F Grahek, R Hendershot, D Fahey, R Gao, P Popp, T Marcy, D Baumgardner, M Mahoney, M Loewenstein, H Jost, J Lopez, J Grose, J Podolske, M Schoeberl, L Lait and P Newman, Observations of NO and NOy in the southernmost CRYSTAL-FACE mission flights , Poster presentation at NASA CF Workshop, Salt Lake City, Utah, 24-28 Feb 2003.
	Brian Ridley, Andrew Weinheimer, Denise Montzka, David Knapp, Frank Grahek, Roger Hendershot, Lesley Ott, Kenneth Pickering, Darrel Baumgardner, Michael Mahoney , Florida Thunderstorms: A Faucet of Reactive Nitrogen to the Upper Troposphere, Poster presentation at NASA CF Workshop, Salt Lake City, Utah, 24-28 Feb 2003.
	AJ Weinheimer, BA Ridley, DJ Knapp, DD Montzka, FE Grahek, RG Hendershot, DW Fahey, RS Gao, PJ Popp, TP Marcy, EM Weinstock, JB Smith, DS Sayres, J Vellovic, JG Anderson, D Baumgardner, BE Anderson, TP Bui, SW Bowen, L Pfister, J Dean-Day, C Chang., Measurements of Condensed-Phase NOy from the WB-57F in CRYSTAL-FACE., Poster presentation at NASA CF Workshop, Salt Lake City, Utah, 24-28 Feb 2003.
	Xueref, I., C. Gerbig, B. Daube, E. Weinstock, J. Smith, D. Sayres, J. Anderson, S. Wofsy, A. Andrews, M. Loewenstein, H. Jost, J. Podolske, J. Lopez, B. Ridley, A. Weinheimer, D. Knapp, D. Montzka, E. Richard, Distribution of CO2 and other tracers in convective and non-convective regions during CRYSTAL-FACE, Eos. Trans. AGU, 83(47), Fall Meet. Suppl., Abstract A21A-0023, 2002.
	Richard, E., Aikin, K., Ray, E., Rosenlof, K. , Thompson, T., Weinheimer, A. Montzka, D., Knapp, D., Ridley, B., Large-scale equatorward transport of ozone in the subtropical lower stratosphere, JGR-Atmospheres, Accepted: 200 August 2003

Overland fire (Jamestown,Colorado)

Photo D.Knapp from south near NCAR facing north. 10.29.03 ~2000 UTC

MODIS Aqua photo 10.29.03 2045 UTC, thanks to Jeff Schmaltz and Holli Riebeek at NASA GSFC

I used to be with it, but then they changed what "it" was. Now, what I'm with isn't it, and what's "it" seems weird and scary to me.
-Abe Simpson

We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time.

T.S. Eliot

First they came for the communists, and I did not speak out because I was not a communist
Then they came for the socialists, and I did not speak out because I was not a socialist
Then they came for the trade unionists, and I did not speak out because I was not a trade unionist
Then they came for the Jews, and I did not speak out because I was not a Jew
Then they came for me and there was no one left to speak out for me.

Martin Niemoller - moral failure in the face of the fascist terror