Isotopes in the CCSM - PowerPoint PPT Presentation

Loading...

PPT – Isotopes in the CCSM PowerPoint presentation | free to view - id: 149432-NTdmM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Isotopes in the CCSM

Description:

... and Work plan (with Inez Fung and Bette OttoBliesner on ... Jung-Eun Lee and Inez Fung. CAM2 - Precipitation Weighted Annual Mean 18O in Precipitation ... – PowerPoint PPT presentation

Number of Views:32
Avg rating:3.0/5.0
Slides: 12
Provided by: maho6
Category:
Tags: ccsm | inez | isotopes

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Isotopes in the CCSM


1
Isotopes in the CCSM
  • No resources in NCAR community effort
  • NCAR efforts to organize Andrew Gettelman and
    Natalie Mahowald
  • Identify priorities
  • Identify gaps/complementary and overlaping
    activities
  • Make plan to implement water and carbon dioxide
    isotopes into CCSM
  • Organizational meeting (June, 2003) community
    indicated there was a need for a workshop and
    plan
  • CCSM Isotope workshop (Jan, 2004) Identified
    Science questions, Priorities and Work plan (with
    Inez Fung and Bette OttoBliesner on
    organizational committee)

2
  • Water Isotopes can help address following science
    questions
  • Paleoclimate (many proxies are isotopes)
  • Upper troposphere/lower stratospheric transport
  • Water cycle improvements
  • Improve parameterizations of cloud processing,
    transport
  • Improve understanding
  • Surface Water budget
  • Ocean circulation
  • Need for some carbon
  • dioxide isotopes

Figure courtesy of Gavin Schmidt
3
  • Carbon dioxide isotopes (delO18)
  • Can provide information about sources and sinks
    of carbon dioxide in atmosphere and plants
  • Intimately linked with water isotopes in the
    plants
  • Requires links to water in soils and plants

Figure courtesy of Chris Still
4
  • Carbon dioxide isotopes
  • (C13) Differentiates between different land
    sources and sinks of carbon dioxide (land, ocean,
    C3/C4 plants)
  • (C14-bomb C14) Provides information about
    reservoir lifetimes of carbon in different pools
    (e.g. woody mass, roots, etc.)

5
Work Plan
  • Priorities (1) Water Isotopes, (2) Carbon
    dioxide isotopes
  • Water Isotopes ongoing work by
  • David Noone (CU), Sun Wong (Maryland), Andrew
    Gettelman (NCAR)
  • Jung Eun Lee (UCB) simple approach
  • Difficulties
  • Moving target (CCM3-CAM2-gtCAM3)
  • Problems in physics, transport code makes water
    isotopes difficult to implement
  • Few NCAR resources (need to incorporate into
    development branch, etc.)

6
Carbon dioxide isotopes (work plan)
  • Entrepeneurial work by
  • Bill Riley, Chris Still and David Noone to
    incorporate delO18 isotopes into CLM (from LSM)
  • Scott Denning and Neil Suits to incorporate
    delC13 into CLM
  • delC14 ?(relatively easy once above done, but no
    plan)
  • Ocean model isotopes (tracer work in progress)
  • Problems
  • Moving targets (LSM vs. CLM), hopefully reduced
    in future
  • Needs many new features (e.g. new tracers
    advected in plants in CLM)
  • Lack of BGC resources (land working group
    supportive)

7
CAM2 - Precipitation Weighted Annual Mean ?18O in
Precipitation
CAM2
GNIP Obs.
  • Reasonable first simulation of water isotopes in
    precipitation in CAM2.

Jung-Eun Lee and Inez Fung
8
Mean Annual ?D in vapor
CAM2
  • Observed
  • Nebraska, USA (Ehhalt, 1974)
  • Heidelberg, Germany (Taylor, 1972 only up to 5
    km)
  • Stratosphere (Pollock, 1980)
  • From Araguas-Araguas
  • et al., 2000
  • CAM 2 captures general feature of the vertical
    profile of water isotopes in vapor.
  • But minimum value too low--first guess need
    more condensate in CAM2 upper tropopause,
    oxidation of methane (?)

Jung-Eun Lee and Inez Fung
9
CCM3 prototype
David Noone
10
What BGCWG (and other working groups) can do
  • Identify isotopes in the model as a priority to
    the CCSM so that resources are allocated to
    implement and support the codes.

11
New areas
  • Iron cycle (atmosphere (Mahowald) and ocean
    (Moore))
  • Nitrogen cycleland (Thornton) and atmosphere
    (Lamarque/Hess)
  • Sulfur cycle--? (atmosphere ready, ocean?)
  • River biogeochemistry
  • Coastal biogeochemistry
  • Ocean Sediment model
  • Isotopes
  • Fires
  • Phosphate (no need to couple?)
About PowerShow.com