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Use of multi-tracers simulations for characterizing transport models

Explore the use of multi-tracers to enhance transport model accuracy in atmospheric research. Learn about inter-hemispheric gradients, HIPPO observations, CONTRAIL measurements, and more.

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Use of multi-tracers simulations for characterizing transport models

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  1. Use of multi-tracers simulations for characterizing transport models Prabir K. Patra, TransCom modellers, ACTM modellers, HIPPO, CONTRAIL, CARIBIC, Surface measurement teams Presented atTransCom meeting 2012 04-08 June 2012; Nanjing, China Research Institute for Global Change

  2. Introduction • Uncertainties in transport model impede use and interpretation (inversion) of atmospheric observations • We believe use of multi-tracers is critical to separate errors associated with surface fluxes and model transport • Recent aircraft measurement provides opportunity for testing model performances at different altitudes

  3. Inter-Hemispheric (IH) gradient in transport models TransCom-CH4(Patra et al., ACP, 2011) HIPPO (Kort et al., GRL, 2011) 500m 4500m – 6.9 –6.8 –6.7 –6.6 –6.5 –6.4 SF6 [ppt] Observed Prior model 60oS 40oS 20oS Eq. 20oN 40oN 60oN 80oN

  4. Latitudinal gradients of CH3CCl3(emitted by industrial activity & phased out by Montreal protocol) between hemispheres BRW - SPO OBS_ESRL ACTM : NH/SH = 0.99 ACTM_OH : NH/SH = 1.32 (σpress=1.0-0.1)

  5. Recent work using ACTM

  6. Recent (post 2007) observational data coverage(Surface + CONTRAIL + CARIBIC+HIPPO)

  7. CARIBIC and ACTM between Frankfurt and Chennai - summer (Patra et al., ACP, 2011) Latitude (oN) Flight date

  8. Climate control of South Asian flux seasonality About 1-month delay in carbon uptake from rainfall

  9. CONTRAIL CO2: Role of fluxes on vertical profile simulation Strong CO2 uptake Strong CO2 release

  10. Using multiple tracers to help solve the model-measurement conundrum (Wofsy et al., Phil. Trans. R. Soc., 2011) GEMS HIPPO_1 HIAPER Pole-to-Pole Observations (“HIPPO”): H_1: January 7, 2009 – Jan. 31, 2009 H_3: March 19, 2010 – April 22, 2010 H_5: June 01, 2011 – June 15, 2011 H_6: August 15, 2011 – Sept. 15, 2011 H_2: October 26, 2009 – Nov. 24, 2009 GOES-Chem ACTM http://hippo.ucar.edu/HIPPO/videos/methane-concentrations-from-hippo-i

  11. CARIBIC & ACTM CH4 in the upper troposphere (Schuck et al., JGR, submitted, 2012) (b) Summer Simple inversion suggests 60% increase of CH4 emission from Southern Africa

  12. Tropospheric distribution and variability of N2O (Kort et al., GRL, 2011) NO YES Are we able to simulate the N2O maxima in the mid-/upper troposphere over the tropics and subtropics?

  13. TCCON vs ACTM comparison of CO2, CH4, N2O Park Falls r=0.75 (TransCom Continuous) Saito et al., ACPD, 2012

  14. What I would like to check next…

  15. Initial condition issue in TransCom-CH4 Mauna Loa (20 N) Cape Grim (45 S)

  16. Vertical profile analysis using TransCom-CH4 (in preparation)

  17. Expectations from future TransCom intercomparison (HIPPO STM, March 2012) Never been able to validate the tropospheric cross-sections CH4 (ppb) (Concentration gradients with (1) height for vertical transport, and (2) latitude for transport across the Hadley or Ferrell cells) 2. Multiple species – our best bet to disentangle flux and transport model errors in forward simulations 3. OH in two hemispheres : (critical for CO, NOx, SOx inversions and budgets of CH4, halogenated species etc. 4. Carbon cycle related species (CO2, O2/N2, APO, …, COS, CS2, DMS…) 5. Explore the new horizon – Halogenated species (HCFCs, HFCs, CH3x, CH2Br2, CHBr3)

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