This is part of the labels / documentation for <a href='http://jcm.chooseclimate.org'>Java Climate Model</a><hr/>

#responsibility		¨oldJCMHELLO		§This module sets the key parameters for @jcm.mod.resp, particularly the set of emissions to include - which gases, sectors and time-period, and the @attmeth 

Note also:
€€adju  You can calculate attribution of responsibility for any set of regions, including individual nations - this is set by the general parameter  @socregions  
€€adju Likewise, you can continue attribution calculations into the future, depending on global mitigation scenarios set in @jcm.mod.obj and the options for "effort-sharing" in @shares

#startyear		¨oldJCM4		§Before this date emissions are not attributed to regions.
Note that regional CH4 and N2O data is only available between 1890 and 2100.

#endyear		¨oldJCM4		§After this date emissions are not attributed to regions.
Note that regional CH4 and N2O data is only available between 1890 and 2100.

#sepbunker		¨oldJCM4		§Puts the aviation/shipping "bunker fuels" into a separate region (as specified for unfccc exercise).

#simplecarbon		¨oldJCM4		§Applies a simpler formula for attributing carbon sinks (see responsibility.java code).

#differential		¨oldJCM4		§Applies the differential attribution of radiative forcing (see @attribution JCM documentation, and Enting et al 98).

#incunatt		¨oldJCM4		§Include the 'Unattributed' Category in the plot. Unattributed includes the effect of emissions before and after the attribution period, of gases/forcings other than CO2, CH4 and N2O, and associated feedback processes.  By deselecting this option, and also selecting the @stack and @frac options, you can explore the relative (%) attribution from different regions, which is much less sensitive than the absolute attribution to certain scientific uncertainties and varying future scenarios.

#resphowwork		¨oldJCM4		§The methods section of the Documentation submitted for the UNFCCC assessment (@attribution) explains more about how these calculations are done, and discuss some scientific and methodological issues.

Potentially,  this approach could be applied not only to regions, but to any set of emissions from different sources -e.g. individual projects (CDM), time-periods (intergenerational equity), gases (to replace GWP), etc.
  %%€€cogs Note: To fulfil the specifications of the UNFCCC assessment, this module works with only 4 regions, compared to the 12 in JCM (see @regshares, @aboutregions). Therefore it is not currently possible to apply the  Brazilian proposal as a @distribution option %%

#att_berlin_int		¨oldJCM4		§<center>UNFCCC workshop on scientific and technical aspects of the Brazilian Proposal

Berlin, 8-9 Sept 2003

Ben Matthews,
  matthews 

 @climate.be

UCL-ASTR, Belgium

Java Climate Model
  jcm.chooseclimate.org
  <hr>

<li>@att_berlin_new  <li>@att_berlin_absrel  <li>@att_berlin_sciasp  <li>@att_berlin_methasp  <li>@att_berlin_commsens

  <hr>
  £!AttributeSetup

#att_berlin_new		¨oldJCM4		§(Since last workshop)  <li>More Regions  <li>Stabilisation - Concentration, Forcing, Temperature  <li>Climate-Carbon Feedbacks  <li>Presentation, Relative %,   <li>start probabilistic approach

  <hr>£!AttributeSetup <hr>@att_berlin_absrel

#att_berlin_absrel		¨oldJCM4		§Sensitivity to uncertainties depends on what we care about:  <li>Absolute attribution (metric of future warming commitment, potential damages/adaptation fund?)  <li>Relative attribution (% for each Party as original proposal)

Choice affects design of Stage 3

  <hr>£!AttributeSetup <hr>@att_berlin_sciasp

#att_berlin_sciasp		¨oldJCM4		§<li>Climate Model / Sensitivity, Sulphate / Solar forcing   <li>Response time / mixing rates  <li>Carbon cycle - mixing & Climate-Carbon Feedbacks
  %%(note "simple" method sink prop to concn)%%  <li>LUCF emissions   <li>Other gas -OH lifetime %%depends on attribution method%%  <li>Historical Emissions: how to constrain?

  <hr>£!AttributeSetup <hr>@att_berlin_methasp

#att_berlin_methasp		¨oldJCM4		§<li>Timescale:  depends on indicator and data  <li>Indicator:  Forcing, Temperature, Sealevel
  - time response different (SL curves cross 30yr after T)
  - sensitivities of relative attribution similar  <li>Scenario:  Effect of Future Stabilisation level on Attributed Warming due to Historical Emissions
-%% Depends on attribution method. Shape of scenario? %%
  -%%(Future convergence: Percapita emissions doesn't converge percapita attribution! Integration?)%%

  <hr>£!AttributeSetup <hr>@att_berlin_commsens

#att_berlin_commsens		¨oldJCM4		§%%(diversion from BP to Article2/Stabilisation, but about probabilistic <b>method</b>)%%  <li>JCM Can stabilise Temperature, Forcing, Concentration.  <li>@wccc2003  <li>Relative Responsibility not so sensitive,
  but "Probabilistic" approach maybe useful for Absolute Responsibility.   <li>Communication of how-it-works / choices / sensitivities
  - interactive JCM shows cause-effect
  - general problem for IPCC-AR4 (more probabilities/dimensions)  <li>To solve Article 2 - need more citizen involvement - Article 6
  - same for value-judgements in methodological choices of BP
  - Recall "Policymaker Model" concept
  - Languages, web tool for Global Dialogue

  <hr>£!AttributeSetup <hr>@att_berlin_int

#othghg		¨oldJCM4		§(not currently used)

#accc-match-doc		¨oldJCM4[oldkey=attribution]		§For a general introduction see @jcm.mod.resp

JCM has recently contributed to 2 scientific paperson this topic published by the MATCH group. These may become available from the MATCH website. {{
*:See <a href="http://www.match-info.net">Modelling and Assessment of Contributions to Climate Change</a>
}}
The methods section of the Documentation submitted for the older UNFCCC assessment (ACCC)  explains more detail about the calculations made by JCM using the @attribTracer, and discusses some scientific and methodological issues.

The pages and external links below are rather out-of-date, but may still be useful
{{
*: @att_berlin_int
%%Note: some new features were added prior to the Berlin meeting, which have not yet been documented %%
*: <a href="http://www.chooseclimate.org/jcm24dec02/doc/fcccattrib/fcccattrib.html"> Documentation from JCM 2002</a>
%%The Documentation from Phase I/II intercomparison exercise (2002) has not yet been converted to the jcm wiki-doc format %%
*: <a href="http://www.chooseclimate.org/jcm24dec02/attribution.html" target='_new'> Open the old version of JCM (Sept 2002)</a> ,  for consistency with the documentation and submitted results  
}}