1 / 8

Coupled BGC-Climate Experiments

Coupled BGC-Climate Experiments. Leap0: CCSM1 ( aka WCRP-IGBP C4MIP) Interactive land and ocean C cycles, Prognostic CO 2 in atm. Successful coupling of ocean BGC to CCSM1 – 30 year spin-up so far and running. Successful implementation of land BGC modules. Flexible architecture .

alexis
Download Presentation

Coupled BGC-Climate Experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Coupled BGC-Climate Experiments • Leap0: CCSM1 ( aka WCRP-IGBP C4MIP) • Interactive land and ocean C cycles, Prognostic CO2 in atm. • Successful coupling of ocean BGC to CCSM1 – 30 year spin-up so far and running. Successful implementation of land BGC modules. Flexible architecture. • Leap1: CCSM2 • Dust  marine productivity  C • Ongoing development and testing of dust cycle (Mahowald) and marine ecosystem model (Moore) Helps focus module development and scientific investigations Breckinridge, 6/01

  2. Atmosphere Model Applications • CO2inversions (Dargaville, Chen, Bruhwiler, Baker) – US C sink not so huge • Assimilation of AVHRR aerosol data (Collins & Rasch) • Forward modeling of dust cycle – changes in LGM and 21st century (Mahowald) • Forward modeling of SF6- diagnose transport in CCM (Dargaville) • Water isotopes – for interpreting CO18O, understanding climate proxies, diagnosing water cycle (Noone) MATCH CAM-LSM Breckinridge, 6/01

  3. Atmospheric Tracer Transport Model • MATCH (Rasch) – off-line NCAR model; widely used, minimally supported • Importance of atm circ. variability/ uncertainties in interpreting CO2 variations • 3 entries (out of 20) in IGBP TransCom - (Chen, Law, Bruhwiler) • Only model with 20+ yr interannual transport to investigate transport vs source/sink variability (Dargaville) • Simulations of SF6, CO2(z in PBL)  additional tests of circ statistics in GCM (Dargaville, Bruhwiler) Breckinridge, 6/01

  4. Ocean BGC • Migration of OCMIP2 BGC model to POP (Lindsay) • New ocean ecosystem model – Fe, Si (Moore) • 50% of world ocean is Fe limited • Computational not unreasonable • Successful implementation of C-13 in BGC (Fung) • diagnostic of ocean carbon processes and their competition • Planned implementation of additional tracers to diagnose C cycle: oxygen (Stephens) Breckinridge, 6/01

  5. Land BGC • Flexible architecture in CLM2 for community development of BGC modules (Bonan) • Community enthusiasm for development and applications of CLM2-BGC • Interactive land N-C cycles – ready for CLM2 (Thornton) • Disturbance: frequency, intensity, and recovery dynamics; dynamic vegetation (Thornton, Bonan et al.) • Dust (Mahowald and Zender) • Need to incorporate BGC in CLM2 river runoff – for coupling to coastal/open ocean BGC (Sundquist) Breckinridge, 6/01

  6. Issues • BGC – model development, model diagnostic, and model application. • Recommend addition of a standard suite of tracers in CAM2 and COM2 to diagnose transport • CAM: SF6 (interhem.),radon (convective), “Simple strat O3” (strat-trop), blobs at low, mid, upper trop • COM: CFC (101-102 yr), 14C(102-103 yr), … • Recommend addition of “Constrained Transport Module” into CCSM – for diagnosing land or ocean sources/sinks Breckinridge, 6/01

  7. Need procedure for community access to “b” versions of CAM2, CLM2, COM2 codes for BGC development • Code documentation • ? email to WG co-chairs stating scientific plan, will not distribute, will share code with CCSM community afterwards,… • Computer codes, platforms, computer time • How do we keep up with fast evolution Breckinridge, 6/01

  8. Potential growth: carbon/BGC data assimilation – • CO2 satellite hopeful • CCSM only comprehensive C-climate model in US • collaboration with DAO Breckinridge, 6/01

More Related