[{"data":1,"prerenderedAt":710},["ShallowReactive",2],{"experiment-explainers":3,"glossary":484},[4,122,205,279,347,411],{"id":5,"title":6,"author":7,"body":8,"date":103,"description":104,"experiment":17,"extension":105,"furtherReading":106,"meta":116,"navigation":117,"path":118,"seo":119,"stem":120,"__hash__":121},"content\u002Fblog\u002Fwhat-is-1pctco2.md","What is the 1pctCO2 experiment?","Charles Turner, ACCESS-NRI",{"type":9,"value":10,"toc":97},"minimark",[11,23,28,49,53,56,84],[12,13,14,18,19,22],"p",{},[15,16,17],"strong",{},"1pctCO2"," is an idealised ramp experiment. Starting from the pre-industrial\ncontrol climate, the carbon dioxide concentration is increased by ",[15,20,21],{},"1% every\nyear",", compounding, so it doubles after about 70 years and quadruples after\nroughly 140.",[24,25,27],"h2",{"id":26},"what-it-does","What it does",[12,29,30,31,35,36,38,39,43,44,48],{},"Like ",[32,33,34],"code",{},"abrupt-4xCO2",", this run is not meant to be realistic — no real-world\nscenario raises CO2 on such a smooth, steady schedule. Instead of one instant\nshock, though, ",[32,37,17],{}," applies the CO2 as a slow, clean ramp. That lets us\nwatch the climate respond to a ",[40,41,42],"em",{},"gradually"," strengthening\n",[45,46,47],"jargon",{"term":47},"forcing",", which is much closer to how the real world\nwarms over time.",[24,50,52],{"id":51},"why-we-care","Why we care",[12,54,55],{},"The steady ramp is what makes this experiment so useful:",[57,58,59,66,74],"ul",{},[60,61,62,65],"li",{},[15,63,64],{},"Transient Climate Response (TCR)"," — the warming at the moment CO2 doubles\n(around year 70) tells us how much the planet heats up while the ocean is\nstill catching up.",[60,67,68,73],{},[15,69,70],{},[45,71,72],{"term":72},"TCRE"," — because emissions accumulate smoothly, this\nrun is the backbone for relating cumulative CO2 to warming, which underpins\ncarbon budgets.",[60,75,76,77,79,80,83],{},"It bridges the gap between the instantaneous ",[32,78,34],{}," shock and the\nmessier, forcing-rich ",[32,81,82],{},"historical"," run.",[12,85,86,88,89,92,93,96],{},[32,87,17],{}," is one of the core ",[45,90,91],{"term":91},"DECK"," experiments that every\n",[45,94,95],{"term":95},"CMIP"," model runs, so its results can be compared cleanly\nfrom one model to the next.",{"title":98,"searchDepth":99,"depth":99,"links":100},"",2,[101,102],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"2026-07-08","CO2 rises by 1% every year until it has quadrupled — a clean, gradual ramp used to measure how fast the climate warms.","md",[107,110,113],{"title":108,"url":109},"WCRP CMIP — the Coupled Model Intercomparison Project","https:\u002F\u002Fwcrp-cmip.org\u002Fcmip7\u002F",{"title":111,"url":112},"Eyring et al. (2016): CMIP6 experimental design and organisation (defines the DECK, including 1pctCO2)","https:\u002F\u002Fdoi.org\u002F10.5194\u002Fgmd-9-1937-2016",{"title":114,"url":115},"Carbon Brief: explainer on the transient climate response","https:\u002F\u002Fwww.carbonbrief.org\u002Fexplainer-how-scientists-estimate-climate-sensitivity\u002F",{},true,"\u002Fblog\u002Fwhat-is-1pctco2",{"title":6,"description":104},"blog\u002Fwhat-is-1pctco2","H98s5U8GxRTEFOPL0sTPpIEgZc6X87HwKtC8VzwlPzc",{"id":123,"title":124,"author":7,"body":125,"date":103,"description":194,"experiment":131,"extension":105,"furtherReading":195,"meta":200,"navigation":117,"path":201,"seo":202,"stem":203,"__hash__":204},"content\u002Fblog\u002Fwhat-is-1pctco2-bgc.md","What is the 1pctCO2-bgc experiment?",{"type":9,"value":126,"toc":190},[127,140,142,149,151,165,180],[12,128,129,132,133,135,136,139],{},[15,130,131],{},"1pctCO2-bgc"," is a companion to ",[32,134,17],{}," that splits the climate system in\ntwo. The CO2 still rises by 1% every year, but only the ",[15,137,138],{},"biogeochemistry"," —\nthe carbon cycle — is allowed to notice it. The radiation code is told CO2 is\nstill at its pre-industrial level, so the climate never actually warms.",[24,141,27],{"id":26},[12,143,144,145,148],{},"This is a deliberately artificial trick. By letting plants and the ocean respond\nto rising CO2 while keeping the physical climate fixed, we isolate a single\neffect: ",[15,146,147],{},"how much extra carbon the land and ocean draw down purely because there\nis more CO2 in the air",", with no warming to complicate it. \"bgc\" stands for\nbiogeochemically coupled.",[24,150,52],{"id":51},[12,152,153,154,156,157,160,161,164],{},"On its own, ",[32,155,131],{}," measures the ",[40,158,159],{},"concentration–carbon feedback",": the\nappetite of natural carbon sinks as CO2 climbs. Paired with its radiatively\ncoupled twin ",[32,162,163],{},"1pctCO2-rad",", it lets scientists cleanly separate the two ways CO2\naffects the carbon cycle:",[57,166,167,173],{},[60,168,169,172],{},[15,170,171],{},"This run"," — more CO2 means more uptake by land and ocean.",[60,174,175,179],{},[15,176,177],{},[32,178,163],{}," — a warmer climate weakens that uptake.",[12,181,182,183,185,186,189],{},"Comparing the fully coupled ",[32,184,17],{}," against these two idealised halves is how\nmodels quantify carbon–climate feedbacks, which shape the remaining\n",[45,187,188],{"term":72},"carbon budget",".",{"title":98,"searchDepth":99,"depth":99,"links":191},[192,193],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"The same 1%-a-year CO2 ramp, but only the carbon cycle 'sees' it — isolating how much carbon the land and ocean soak up.",[196,197],{"title":108,"url":109},{"title":198,"url":199},"Jones et al. (2016): C4MIP experimental protocol (defines 1pctCO2-bgc and -rad)","https:\u002F\u002Fdoi.org\u002F10.5194\u002Fgmd-9-2853-2016",{},"\u002Fblog\u002Fwhat-is-1pctco2-bgc",{"title":124,"description":194},"blog\u002Fwhat-is-1pctco2-bgc","ocLias2NxjllWoKEt4PWv-aXw2M33Z67v6j9xSurmrU",{"id":206,"title":207,"author":7,"body":208,"date":103,"description":270,"experiment":163,"extension":105,"furtherReading":271,"meta":274,"navigation":117,"path":275,"seo":276,"stem":277,"__hash__":278},"content\u002Fblog\u002Fwhat-is-1pctco2-rad.md","What is the 1pctCO2-rad experiment?",{"type":9,"value":209,"toc":266},[210,222,224,234,236,244,258],[12,211,212,214,215,217,218,221],{},[15,213,163],{}," is the mirror image of ",[32,216,131],{},". The CO2 concentration rises\nby 1% every year, but this time only the ",[15,219,220],{},"radiation"," code is allowed to see it,\nso the climate warms as usual. The carbon cycle, meanwhile, is told CO2 is still\nat its pre-industrial level.",[24,223,27],{"id":26},[12,225,226,227,229,230,233],{},"The trick is reversed. Here the planet heats up from the rising\n",[45,228,47],{"term":47},", but plants and the ocean never \"know\" that\natmospheric CO2 has changed — they only feel the warming. That isolates a single\neffect: ",[15,231,232],{},"how a warming climate on its own changes the amount of carbon the land\nand ocean hold",". \"rad\" stands for radiatively coupled.",[24,235,52],{"id":51},[12,237,238,156,240,243],{},[32,239,163],{},[40,241,242],{},"climate–carbon feedback",": warming tends to weaken\nnatural carbon sinks — warmer soils respire more, and a warmer ocean holds less\nCO2. It is the other half of the pair:",[57,245,246,253],{},[60,247,248,252],{},[15,249,250],{},[32,251,131],{}," — more CO2 in the air means more carbon taken up.",[60,254,255,257],{},[15,256,171],{}," — the warming that CO2 causes pushes some of that carbon back out.",[12,259,260,261,263,264,189],{},"Adding the two idealised halves back together should approximately reproduce the\nfully coupled ",[32,262,17],{},". That decomposition is how models pin down carbon–climate\nfeedbacks, a major source of spread in the remaining\n",[45,265,188],{"term":72},{"title":98,"searchDepth":99,"depth":99,"links":267},[268,269],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"The 1%-a-year CO2 ramp is felt only by the radiation code — isolating how a warming climate weakens natural carbon sinks.",[272,273],{"title":108,"url":109},{"title":198,"url":199},{},"\u002Fblog\u002Fwhat-is-1pctco2-rad",{"title":207,"description":270},"blog\u002Fwhat-is-1pctco2-rad","4c_ssIGia6fI_vMt8SWm8_aveQpn12VxSWdL1Q1g4YQ",{"id":280,"title":281,"author":7,"body":282,"date":334,"description":335,"experiment":34,"extension":105,"furtherReading":336,"meta":342,"navigation":117,"path":343,"seo":344,"stem":345,"__hash__":346},"content\u002Fblog\u002Fwhat-is-abrupt-4xco2.md","What is the abrupt-4xCO2 experiment?",{"type":9,"value":283,"toc":330},[284,293,295,298,300,303,324],[12,285,286,288,289,292],{},[15,287,34],{}," is an idealised stress-test. Starting from the pre-industrial\ncontrol climate, the carbon dioxide concentration is ",[15,290,291],{},"instantly quadrupled"," and\nthen held there while the model runs on.",[24,294,27],{"id":26},[12,296,297],{},"Nothing about this is meant to be realistic — no real scenario quadruples CO2\novernight. That is the point. By applying one large, clean, well-defined push, we\ncan watch the climate system respond without the clutter of volcanoes, aerosols\nand gradually changing emissions getting in the way.",[24,299,52],{"id":51},[12,301,302],{},"This experiment is how we measure some of the most important numbers in climate\nscience:",[57,304,305,311,317],{},[60,306,307,310],{},[15,308,309],{},"Climate sensitivity"," — how much the planet ultimately warms for a given\nincrease in CO2.",[60,312,313,316],{},[15,314,315],{},"Feedbacks"," — how clouds, water vapour, ice and the like amplify or damp\nthat warming.",[60,318,319,320,323],{},"How quickly the ocean takes up heat, which sets the ",[40,321,322],{},"pace"," of warming.",[12,325,326,327,329],{},"Because every model runs exactly the same idealised experiment, ",[32,328,34],{},"\ngives us a clean way to compare one model against another.",{"title":98,"searchDepth":99,"depth":99,"links":331},[332,333],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"2026-07-04","A deliberately extreme idealised run: quadruple the CO2 instantly and watch how the climate responds.",[337,338,340],{"title":108,"url":109},{"title":339,"url":112},"Eyring et al. (2016): CMIP6 experimental design and organisation (defines the DECK, including abrupt-4xCO2)",{"title":341,"url":115},"Carbon Brief: explainer on climate sensitivity",{},"\u002Fblog\u002Fwhat-is-abrupt-4xco2",{"title":281,"description":335},"blog\u002Fwhat-is-abrupt-4xco2","hw0eYjW8bKPPsMycmgBmnqXOAyx1dBrxmdZYuMeF9Hw",{"id":348,"title":349,"author":7,"body":350,"date":397,"description":398,"experiment":82,"extension":105,"furtherReading":399,"meta":406,"navigation":117,"path":407,"seo":408,"stem":409,"__hash__":410},"content\u002Fblog\u002Fwhat-is-historical.md","What is the historical experiment?",{"type":9,"value":351,"toc":393},[352,358,360,367,381,384,386],[12,353,354,355,357],{},"The ",[15,356,82],{}," experiment is the model's attempt to reproduce the climate we\nhave actually observed, from the mid-19th century up to the near-present. It is\none of the cornerstone simulations every model contributes to CMIP.",[24,359,27],{"id":26},[12,361,362,363,366],{},"Starting from a stable pre-industrial state, the model is driven forward using\nour best reconstruction of the real-world ",[40,364,365],{},"forcings"," over that period:",[57,368,369,372,375,378],{},[60,370,371],{},"rising greenhouse gas concentrations,",[60,373,374],{},"volcanic eruptions and changes in solar output,",[60,376,377],{},"aerosols and other pollutants,",[60,379,380],{},"land-use change.",[12,382,383],{},"Everything else — the winds, ocean currents, the timing of El Niño — the model\nworks out for itself.",[24,385,52],{"id":51},[12,387,388,389,392],{},"The historical run is how we check the model against reality. If it can\nreproduce the observed warming, the pattern of temperature change, and events\nlike the cooling after major volcanic eruptions, we gain confidence that its\nprojections of the ",[40,390,391],{},"future"," are worth taking seriously. It is also the baseline\nthat future scenario runs branch off from.",{"title":98,"searchDepth":99,"depth":99,"links":394},[395,396],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"2026-07-03","The historical run recreates the climate of 1850 to the present using our best estimate of what actually drove it.",[400,401,403],{"title":108,"url":109},{"title":402,"url":112},"Eyring et al. (2016): CMIP6 experimental design and organisation (defines the historical simulation)",{"title":404,"url":405},"Carbon Brief: how do climate models work?","https:\u002F\u002Fwww.carbonbrief.org\u002Fqa-how-do-climate-models-work\u002F",{},"\u002Fblog\u002Fwhat-is-historical",{"title":349,"description":398},"blog\u002Fwhat-is-historical","59nZOFQUExHhYA3c-NPrmbtKnfN4Tu_HIE3ik-r0XYc",{"id":412,"title":413,"author":7,"body":414,"date":473,"description":474,"experiment":420,"extension":105,"furtherReading":475,"meta":479,"navigation":117,"path":480,"seo":481,"stem":482,"__hash__":483},"content\u002Fblog\u002Fwhat-is-picontrol.md","What is the piControl experiment?",{"type":9,"value":415,"toc":469},[416,426,428,431,433,440,461],[12,417,418,421,422,425],{},[15,419,420],{},"piControl"," — pre-industrial control — is a long simulation of the climate as\nit was ",[40,423,424],{},"before"," large-scale human influence, with greenhouse gases, aerosols and\nland use all held fixed at their roughly-1850 levels.",[24,427,27],{"id":26},[12,429,430],{},"Nothing is changed once the run starts. The forcings are constant, so the\nclimate simply settles into its own natural rhythm and drifts only very slowly.\nThese runs are long — often a thousand model years or more — precisely because\nwe want to see that natural, unforced variability play out over centuries.",[24,432,52],{"id":51},[12,434,435,436,439],{},"piControl is the ",[15,437,438],{},"reference point"," for almost everything else on this\ndashboard:",[57,441,442,455,458],{},[60,443,444,445,447,448,450,451,454],{},"Other experiments (like ",[32,446,82],{}," or ",[32,449,34],{},") branch off from it, so\ntheir results are read as a ",[40,452,453],{},"departure"," from this quiet baseline.",[60,456,457],{},"It tells us how much a climate can wobble on its own, which is how we judge\nwhether a change in another run is a real signal or just noise.",[60,459,460],{},"A stable piControl with little drift is a basic sign the model is behaving.",[12,462,463,464,92,466,468],{},"It is one of the core ",[45,465,91],{"term":91},[45,467,95],{"term":95}," model runs, which is what lets results be compared\nacross models and across CMIP generations.",{"title":98,"searchDepth":99,"depth":99,"links":470},[471,472],{"id":26,"depth":99,"text":27},{"id":51,"depth":99,"text":52},"2026-07-02","A long, stable simulation of a pre-industrial world that acts as the quiet baseline for every other run.",[476,477],{"title":108,"url":109},{"title":478,"url":112},"Eyring et al. (2016): CMIP6 experimental design and organisation (defines the DECK, including piControl)",{},"\u002Fblog\u002Fwhat-is-picontrol",{"title":413,"description":474},"blog\u002Fwhat-is-picontrol","CdqHqJ9FVGT4tMlHwMVnT_RT5v9Jf4aMzl3ZosLmSNM",[485,503,514,527,539,550,563,575,591,600,612,626,639,658,673,685,698],{"id":486,"aliases":487,"expansion":488,"extension":489,"links":490,"long":497,"meta":498,"short":499,"stem":500,"term":501,"__hash__":502},"glossary\u002Fglossary\u002Faccess.yml",null,"Australian Community Climate and Earth System Simulator","yml",[491,494],{"title":492,"url":493},"ACCESS-NRI","https:\u002F\u002Fwww.access-nri.org.au",{"title":495,"url":496},"CSIRO","https:\u002F\u002Fwww.csiro.au","ACCESS is Australia's flagship coupled climate and earth-system model, developed and run as a partnership: ACCESS-NRI (the National Research Infrastructure) leads the software, model development and computational infrastructure, while CSIRO leads the underlying science. Together they produce ACCESS's contribution to CMIP7 — the experiments this dashboard tracks.",{},"Australia's national climate and earth-system model, developed and run jointly by ACCESS-NRI and CSIRO.","glossary\u002Faccess","ACCESS","o8ZtyKkJtSPysdaWaKNF4BbczAXDQ9XefRDW-8t-yx0",{"id":504,"aliases":505,"expansion":507,"extension":489,"links":487,"long":508,"meta":509,"short":510,"stem":511,"term":512,"__hash__":513},"glossary\u002Fglossary\u002Famip.yml",[506],"amip","Atmospheric Model Intercomparison Project","In AMIP-style experiments the sea-surface temperatures and sea ice are fixed to observed values, so only the atmospheric part of the model is exercised. This isolates atmospheric behaviour from ocean feedbacks, which is why AMIP runs are treated as model-evaluation experiments rather than projections of the future.",{},"Experiments where the ocean is prescribed from observations, testing just the atmosphere.","glossary\u002Famip","AMIP","6bbuZBBgDDqOFmk3Hz_KoxM7HCWYMWWBmneya4I1d1k",{"id":515,"aliases":516,"expansion":518,"extension":489,"links":519,"long":522,"meta":523,"short":524,"stem":525,"term":95,"__hash__":526},"glossary\u002Fglossary\u002Fcmip.yml",[517],"CMIPs","Coupled Model Intercomparison Project",[520],{"title":108,"url":521},"https:\u002F\u002Fwcrp-cmip.org\u002F","CMIP is a long-running, community-wide project that agrees on a common set of climate-model experiments and output formats. Because every participating group runs the same experiments in the same way, their models can be compared like-for-like, and the results feed into major assessments such as the IPCC reports. It runs in numbered phases — CMIP5, CMIP6, and now CMIP7.",{},"The international effort where climate-modelling groups run a shared set of experiments so their results can be compared.","glossary\u002Fcmip","yXvJGCh1M-AysIQJzeLyxQcF_YjS3fa1AAe5e0yVoCU",{"id":528,"aliases":487,"expansion":529,"extension":489,"links":530,"long":533,"meta":534,"short":535,"stem":536,"term":537,"__hash__":538},"glossary\u002Fglossary\u002Fcmip7.yml","Coupled Model Intercomparison Project — Phase 7",[531],{"title":532,"url":109},"WCRP CMIP7","CMIP7 is the seventh phase of CMIP. It defines the current generation of shared experiments that modelling groups worldwide are running and publishing. This dashboard reports the progress and results of ACCESS — Australia's model, developed and run jointly by ACCESS-NRI and CSIRO.",{},"The current phase of CMIP, and the set of experiments this dashboard tracks.","glossary\u002Fcmip7","CMIP7","E2njjZ4DrUaEcBrKZKTIaZPZ7Pvm6b7_8QeM5zMhuV0",{"id":540,"aliases":487,"expansion":541,"extension":489,"links":542,"long":545,"meta":546,"short":547,"stem":548,"term":91,"__hash__":549},"glossary\u002Fglossary\u002Fdeck.yml","Diagnosis, Evaluation, and Characterization of Klima",[543],{"title":544,"url":112},"Eyring et al. (2016): CMIP6 experimental design and organisation (defines the DECK)","The DECK (Diagnosis, Evaluation, and Characterization of Klima) is a small, fixed  set of core experiments — a pre-industrial control, a historical run, and a couple of idealised CO₂ experiments — that every model contributes in each phase of CMIP.  Keeping this entry set constant across models and across CMIP generations is what  makes results comparable over time. (\"Klima\" is just the Greek word for climate.)",{},"The standard baseline set of experiments every CMIP model is expected to run.","glossary\u002Fdeck","AQKMzRq3CIgg7bprFiQq1GLIu5Hj0XXVeeDApubZySA",{"id":551,"aliases":552,"expansion":487,"extension":489,"links":487,"long":557,"meta":558,"short":559,"stem":560,"term":561,"__hash__":562},"glossary\u002Fglossary\u002Fensemble.yml",[553,554,555,556],"ensemble member","ensemble members","realisation","realization","Because the climate varies naturally from year to year, a single run can be misleading. An ensemble runs the same experiment several times from slightly different starting conditions; comparing the members separates the forced climate signal from random internal variability.",{},"A set of runs of the same experiment that differ only in tiny initial tweaks.","glossary\u002Fensemble","ensemble","GFhiJSSwghpMIJrauOIq520HzfBRN4Heluafeng2-A8",{"id":564,"aliases":487,"expansion":565,"extension":489,"links":566,"long":569,"meta":570,"short":571,"stem":572,"term":573,"__hash__":574},"glossary\u002Fglossary\u002Fesgf.yml","Earth System Grid Federation",[567],{"title":565,"url":568},"https:\u002F\u002Fesgf.llnl.gov\u002F","ESGF is a federation of data servers around the world that together host climate model output, including all CMIP data. When an experiment on this dashboard is marked \"ESGF published\", its data has been uploaded to that archive and is available for anyone to download and analyse.",{},"The distributed data archive where CMIP model output is published and downloaded.","glossary\u002Fesgf","ESGF","dijiLuudvBET1pHKmGNQJg7eq-Fka4Lx6L6rASxcChw",{"id":576,"aliases":577,"expansion":487,"extension":489,"links":582,"long":585,"meta":586,"short":587,"stem":588,"term":589,"__hash__":590},"glossary\u002Fglossary\u002Ffast-track.yml",[578,579,580,581],"Fast-Track","FastTrack","AFT","Assessment Fast Track",[583],{"title":584,"url":109},"WCRP CMIP7 — experiments and Fast Track","The Fast Track is the set of highest-priority CMIP7 experiments that modelling groups focus on completing first, so the most important science and assessment needs are met early rather than waiting for the full experiment catalogue. It is a scheduling and prioritisation concept, not a different kind of experiment.",{},"A prioritised subset of CMIP7 experiments that groups aim to deliver first.","glossary\u002Ffast-track","Fast Track","Y_IF1Fq_vueDidWGgmhMogm3CLIknIlIzZQTqIWBFXg",{"id":592,"aliases":593,"expansion":594,"extension":489,"links":487,"long":595,"meta":596,"short":597,"stem":598,"term":47,"__hash__":599},"glossary\u002Fglossary\u002Fforcing.yml",[594,365],"Radiative forcing","A radiative forcing is an externally imposed change to the planet's energy budget, measured in watts per square metre, such as the extra heat trapped by added CO₂. Experiments differ mainly in how their forcings are set — held fixed (controls), following the historical record, or changed in an idealised way (like abruptly quadrupling CO₂).",{},"An imposed change to Earth's energy balance — for example from CO₂ — that drives climate change.","glossary\u002Fforcing","2EkBUNA1duf6Tuz1mpNoj1fKcNG44jG7BrGbZMFl4vA",{"id":601,"aliases":487,"expansion":602,"extension":489,"links":603,"long":607,"meta":608,"short":609,"stem":610,"term":605,"__hash__":611},"glossary\u002Fglossary\u002Fipcc.yml","Intergovernmental Panel on Climate Change",[604],{"title":605,"url":606},"IPCC","https:\u002F\u002Fwww.ipcc.ch\u002F","The IPCC periodically assesses the state of climate science for policymakers. Its assessment reports draw heavily on CMIP model experiments, which is much of the reason those experiments are standardised and comparable across models.",{},"The UN body that assesses climate science, and a major consumer of CMIP results.","glossary\u002Fipcc","cX88Quu83cLjE96-jrdqruAvahyvGyocpEv4A8SRLP0",{"id":613,"aliases":614,"expansion":487,"extension":489,"links":616,"long":620,"meta":621,"short":622,"stem":623,"term":624,"__hash__":625},"glossary\u002Fglossary\u002Fpayu.yml",[615],"Payu",[617],{"title":618,"url":619},"payu documentation","https:\u002F\u002Fpayu.readthedocs.io\u002F","payu is a workflow-management tool for running climate-model experiments reproducibly on supercomputers, developed and maintained by ACCESS-NRI. It lays out each experiment, submits its runs and records metadata — which is where much of the run telemetry on this dashboard comes from.",{},"The workflow tool ACCESS-NRI develops to configure, run and track model experiments.","glossary\u002Fpayu","payu","PPfaz9GwOWPnXwC6CdXhxcT0AljCjqS34-x-gswYDFk",{"id":627,"aliases":628,"expansion":629,"extension":489,"links":630,"long":633,"meta":634,"short":635,"stem":636,"term":637,"__hash__":638},"glossary\u002Fglossary\u002Fref.yml",[629],"Rapid Evaluation Framework",[631],{"title":632,"url":109},"WCRP CMIP7 — Rapid Evaluation Framework","The Rapid Evaluation Framework (REF) is the evaluation layer of CMIP7: automated tooling that assesses how well a model's output reproduces the observed climate. It is a distinct dimension from run progress — an experiment can be finished yet not yet evaluated — which is why this dashboard shows evaluation status apart from the years-run telemetry.",{},"Tooling that checks how well model output performs, separate from how far a run has progressed.","glossary\u002Fref","REF","9oLaHWmNxr0-WcI5GsqK6092RD4vyS2bpQkZR81ijC4",{"id":640,"aliases":641,"expansion":487,"extension":489,"links":645,"long":652,"meta":653,"short":654,"stem":655,"term":656,"__hash__":657},"glossary\u002Fglossary\u002Fscenario.yml",[642,643,644],"Scenarios","ScenarioMIP","scen7",[646,649],{"title":647,"url":648},"WCRP CMIP — Explainer: scenarios for CMIP7","https:\u002F\u002Fwcrp-cmip.org\u002Fexplainer-scenarios-for-cmip7\u002F",{"title":650,"url":651},"van Vuuren et al. (2026): The Scenario Model Intercomparison Project for CMIP7","https:\u002F\u002Fgmd.copernicus.org\u002Farticles\u002F19\u002F2627\u002F2026\u002F","A scenario is a storyline of future emissions — built from assumptions about population, economic growth, technology and climate policy — that models run forward to project how the climate could respond. CMIP7 uses seven, named for where they end up rather than by an SSP number: High (h), High-to-Low (hl), Medium (m), Medium-to-Low (ml), Low (l), Low-to-Negative (ln) and Very Low (vl). Medium follows today's policies; Very Low cuts emissions as fast as is plausibly possible; the \"-to-\" pathways rise first and fall later, overshooting before coming back down. Runs named esm-scen7-* are the same pathways driven by emissions with an interactive carbon cycle rather than by prescribed CO₂ concentrations. Scenarios are exploratory, not predictions: each asks \"if the world went this way, what would the climate do?\"",{},"A storyline of future emissions that models run forward to project a possible climate.","glossary\u002Fscenario","Scenario","_h1ConnMffoq6Gvy0kqagh9CA_e7qk0Ybgd4Pmx6RKk",{"id":659,"aliases":660,"expansion":662,"extension":489,"links":663,"long":667,"meta":668,"short":669,"stem":670,"term":671,"__hash__":672},"glossary\u002Fglossary\u002Fssp.yml",[661],"SSPs","Shared Socioeconomic Pathway",[664],{"title":665,"url":666},"O'Neill et al. (2016): The Scenario Model Intercomparison Project (ScenarioMIP)","https:\u002F\u002Fdoi.org\u002F10.5194\u002Fgmd-9-3461-2016","SSPs describe different plausible futures for population, economic growth, technology and policy, each implying a different path for greenhouse-gas emissions. Pairing an SSP with a level of climate forcing (for example \"SSP2-4.5\") gives a scenario that models run forward to project a possible future climate — as opposed to the idealised or historical experiments that characterise how the model itself behaves. CMIP7 names its scenarios by the emissions level they reach (High, Medium, Very Low …) rather than by SSP number.",{},"A storyline of future society and emissions used to drive climate projections.","glossary\u002Fssp","SSP","eMgiwaw9jaJelkBMy46WRw2WolZQujm1Gzqj_wqTZyg",{"id":674,"aliases":675,"expansion":676,"extension":489,"links":487,"long":679,"meta":680,"short":681,"stem":682,"term":683,"__hash__":684},"glossary\u002Fglossary\u002Fsu.yml",[676,677,678],"Service Unit","Service Units","SUs","A Service Unit is the accounting unit for time on a shared supercomputer (roughly one core-hour, adjusted for the resources a job requests). The dashboard reports the SUs used per experiment as a measure of how much compute a run has cost.",{},"The unit of supercomputer time an experiment consumes — a measure of compute cost.","glossary\u002Fsu","SU","Ihkp2N6_-2PUwpX2pcS0ar9ETRZxLv2Cf2GAXhjcuQc",{"id":686,"aliases":687,"expansion":691,"extension":489,"links":487,"long":692,"meta":693,"short":694,"stem":695,"term":696,"__hash__":697},"glossary\u002Fglossary\u002Ftas.yml",[688,689,690],"TAS","near-surface air temperature","gm_tas","Near-surface air temperature","\"tas\" is the CMIP variable name for near-surface (about 2 metres) air temperature. Its global mean is the number most people mean by \"global warming\", and several derived indicators on this dashboard — such as global-mean temperature — are built from it.",{},"Air temperature about 2 m above the surface — the basis of \"global temperature\".","glossary\u002Ftas","tas","EN-X7nW_zqM4ib-tb95wkapIrREAqz0VXPmLAeiQs88",{"id":699,"aliases":487,"expansion":700,"extension":489,"links":701,"long":705,"meta":706,"short":707,"stem":708,"term":72,"__hash__":709},"glossary\u002Fglossary\u002Ftcre.yml","Transient Climate Response to cumulative CO₂ Emissions",[702],{"title":703,"url":704},"IPCC AR6 WG1 — the near-linear relationship between cumulative CO₂ and warming","https:\u002F\u002Fwww.ipcc.ch\u002Freport\u002Far6\u002Fwg1\u002F","TCRE is the amount of global warming produced per unit of cumulative CO₂ emitted, and it turns out to be roughly constant. That near-linear relationship is what lets scientists translate a temperature target (say 1.5 °C) into a remaining \"carbon budget\" of how much more CO₂ can be emitted. Several experiments on this dashboard are designed to pin down this value.",{},"How much the planet warms per tonne of CO₂ emitted — the basis of carbon budgets.","glossary\u002Ftcre","uiufZjp_Ap1OWsBuK8vMgCqHCV33UmgXWR4s8fOaP5c",1784874744225]