History of SWIM / JCM

A brief reverse-timeline of the model development:

(which helps explain relative age of modules)

See also: archive of recent SWIM updates

• 2025 (Jun) Mod: Electric-supply rewritten (+ apply Ember data to 2024)
• 2025 (May) Gui: Restore draggable arrow controls
• 2025 (Apr) Restruc merging cross-platform code, Setups/startup
• 2025 (Mar) Scala-Native version
• 2024 (Dec) Restructured emissions to clarify variants, re-org cogs, ...
• 2024 (Jun) Gui: Topic-focus & expert-cogs, Oval-Panels layout, ...
• 2023 (Nov) More data updates, revive attribution (Histo-responsib), fixes
• 2023 (May) Revive histogram/scaterplots/maps, GUI / usability fixes, data updates, core refactoring
• 2022 Summer: presented at conferences: Scenarios Forum (Laxenburg June 22), Earth System Governance (Oct 22), IAMC (Dec 22)
• 2021 Dec: first prototype (presented to conf of Integrated Assessment Modeling Consortium Dec 21)
• 2021 (since May) - conversion to new language Scala3, develop scala.js web GUI
• 2018 (paused - as java-ws removed from browsers, so model no longer accessible )
• 2017 Add economy module - explore socioeconomic drivers without scenarios
• 2016 (in Godinne, to present)
  probabalistic regional pathways <1.5°C / 1.75°C (presented 1.5°C conference Oxford Oct 16)
  + added demographics, migration (presented Hugo Migration conference Liege Dec 16)
  + SSP chooser modules, update core datasets, and Paris pledges
• 2011 (mainly in Rio Brazil)
  energy module with investments (only electricity complete)
  + probabalistic regional pathways <2°C,
  + equity driven pathways (Swiss project) following Cancun pledges
• 2010 contribution EU 2C analyses, UNEP gap report
• 2005-9 contribution influence new Scenarios framework
• 2008 Aviation emissions and forcing, update core to IPCC-AR4
• 2007 Responsibility (attribution analysis - MATCH)
  + complete transition to "JCM5"
• 2006 Land Use Change module (with C. Pires de Campos)
• 2005 start transition to "JCM5" (java5) incl java-webstart GUI with flexible layouts, tree, parallel worlds, wiki, scripts
• 2004 economic cost- optimisation and risk analysis
• 2002-3 (in Louvain la Neuve, until 2010)
  educational versions, testing with students
  + first probabalistic stabilisation analyses <2°C - scripts
  + analysis "shifting the burden of uncertainty" (compare stabilise emit/conc/forcing/temperature/sea-level)
• 2002 (in Bern, Swiss) f-gases, other gases, aerosols - carbon/chem/forcing consistent IPCC 3AR, iterative stabilisation
• 2001 (in Arendal Norway) better interface, documentation, translations, scenarios
• 2000-1 (in Copenhagen) better carbon and climate models (based IPCC-3AR), expo-model, sea-level
• 2000 (in Norwich) first java applet model based on C&C
• 1995-6 (in Norwich) develop policy framework "Contraction and Convergence" - javascript model

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