Tracers in ATTREX: What we learn from CR-AVE, TC- 4, and HIPPO Steve Wofsy Elliot Atlas Presented at the ATTREX Science Team meeting, DFRC 26 Aug 2010.

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Presentation transcript:

Tracers in ATTREX: What we learn from CR-AVE, TC- 4, and HIPPO Steve Wofsy Elliot Atlas Presented at the ATTREX Science Team meeting, DFRC 26 Aug 2010

Whole Air Sample Locations during TC4: DC8 and WB N m

Variation of total organic bromine in the TTL during TC4

What we learn from this: Short lived organic bromine compounds add about 2 ppt of Br to the lower tropical troposphere in one region & season What we have yet to learn: What is the global picture ? Is inorganic Br left behind or scavenged ?

"upper TTL" CO 2 in TC-4 – seasonal cycle and long-term trend provide a unique probe of transport rates and processes. CO 2

Park et al., ACP, 2010 of the mole

Optimum 24-hr mean OH profiles GMI GEOS-CHEM (dashed lines give a priori model OH)

Time Lag (days) Age Spectra t chem

August February "upper TTL"

Flt 0805 & 0809 (transit) Source signatures in the UT: Hydrocarbons Ethane (continental BL)

What we learn from this: CO 2 data can resolve transport time scales of a few days in most seasons, relative to zero age in the ICTZ. CO 2 and data for short lived tracers, with diverse loss mechanisms, can tell us quantitatively about loss rates and transport rates for radical precursors in the TTL. What we have yet to learn: What is the global picture ? How can we do much better than the 1-d (!!) model.

Brooks Range, AK HIPPO: What do the GV cross sections of the Pacific tell us about what we will see from the Global Hawk in ATTREX? HIPPO and ATTREX share a key characteristic: each is taking a broad swath of atmospheric data which will simultaneously give fine-grained texture and a global image. Unexpected results are very likely to emerge.

GV launch in the rain, Anchorage, January, 2009 (HIPPO-1) NCAR Gulfstream V "HIAPER"

HIPPO Instrumentation Multiple measurements: Red symbols ≥ 3, Blue = 2; sampling rates in ().

HIPPO_2 Nov 2009 HIPPO_3 Apr 2010 HIPPO_1 Jan 2009 preHIPPO Apr-Jun 2008 HIPPO itinerary

Day of Year H1 H3 P-H H4 H5 H2 HIPPO Statistics To Date: 156 days of field program, 524 profiles National Science Foundation National Oceanic and Atmospheric Administration G-V "HIAPER": National Center for Atmospheric Research HIPPO Sponsors

Shadow of the Earth visualized by ice crystals over Alaska. Pago Pago, Samoa ITCZ HIPPO scenes

HIPPO-1 Atmospheric Structure (Pot'l T K): January, 2009, Mid-Pacific (Dateline) Cross section m Latitude

CO 2 CH 4 CO HIPPO sections, January km LATITUDE N2ON2OSF 6 O3O km

January 15, UTC W N

CH 4 CO HIPPO_1 Flight 4 Anchorage -> Hawaii 14 January 2009

Nov 2009 CO 2 CH 4 CO Jan 2009 CO 2 CH 4 CO km LATITUDE

January 2009 November LATITUDE N2ON2OO3O km N2ON2O O3O3

January – November Water Vapor comparison

H-3 Mar-Apr 2010 O 3 BC H-1 Jan 2009 O 3

Observed vs Model (ACTM) Prabir Patra, Kentaro Ishijima HIPPO_1 Jan 2009 HIPPO Nitrous Oxide (N 2 O)

Pollution in the upper troposphere of the Arctic …a fall/winter transition phenomenon HIPPO Arctic Pollution

80 N Photo E. Kort

N 2 O CO CH 4 CO BC

What we learn from this: ATTREX science would be enormously enhanced by a companion mission of the GV or the DC-8…because it really matters what is going on below Global Hawk flight levels. We should lavish some attention on jet stream transports, strong-CAPE convection over North America, and the SPCZ. What we have yet to learn: What is the global picture ?