# CMIP6 Hackathon

**URL:** https://discourse.pangeo.io/c/cmip6hack/11.md

[Latest](https://discourse.pangeo.io/latest.md) · [Categories](https://discourse.pangeo.io/categories.md) · [Tags](https://discourse.pangeo.io/tags.md)

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## [Using ocean.pangeo.io for the CMIP6 Hackathon](https://discourse.pangeo.io/t/using-ocean-pangeo-io-for-the-cmip6-hackathon/291)

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**Author:** [@rabernat](https://discourse.pangeo.io/u/rabernat)\
**Replies:** 0\
**Last updated:** [October 15, 2019, 9:11pm UTC](https://discourse.pangeo.io/t/using-ocean-pangeo-io-for-the-cmip6-hackathon/291 "2019-10-15T21:11:48Z")

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All hackathon participants are invited to use ocean.pangeo.io for their project work. This is a JupyterHub environment running in Google Cloud which has direct access to the CMIP6 Cloud Data. Logging In Anyone is techni…

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## [About the CMIP6 Hackathon category](https://discourse.pangeo.io/t/about-the-cmip6-hackathon-category/50)

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**Author:** [@rabernat](https://discourse.pangeo.io/u/rabernat)\
**Replies:** 1\
**Last updated:** [September 19, 2019, 1:14pm UTC](https://discourse.pangeo.io/t/about-the-cmip6-hackathon-category/50 "2019-09-19T13:14:12Z")

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Discussion forum for the CMIP6 hackathon. Hackathon participants can use this forum to propose and coordinate projects, discuss data and software tools, and trade tips. Project proposals should be made in the #cmip6hack…

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## [Regridding of unstructured data (climate model)](https://discourse.pangeo.io/t/regridding-of-unstructured-data-climate-model/2300)

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**Author:** [@Ahmed](https://discourse.pangeo.io/u/Ahmed)\
**Replies:** 1\
**Last updated:** [March 10, 2022, 8:17pm UTC](https://discourse.pangeo.io/t/regridding-of-unstructured-data-climate-model/2300 "2022-03-10T20:17:30Z")

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I work with climate models from CMIP6 and I have to interpolate/re-grid them. The problem is that the data are unstructured in the shape of: msftmz(time, basin, latitude, level). I was able to interpolate the level (dept…

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## [Water masses of the future](https://discourse.pangeo.io/t/water-masses-of-the-future/165)

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**Author:** [@raphaeldussin](https://discourse.pangeo.io/u/raphaeldussin)\
**Replies:** 13\
**Last updated:** [October 27, 2020, 10:56pm UTC](https://discourse.pangeo.io/t/water-masses-of-the-future/165 "2020-10-27T22:56:16Z")

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Water masses of the future Scientific Motivation Water masses have historically been defined using certain potential temperature and salinity bounds for each given one. In view of projected changes in heat content and fr…

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## [Pipelines for downscaling CMIP6 data](https://discourse.pangeo.io/t/pipelines-for-downscaling-cmip6-data/214)

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**Author:** [@jhamman](https://discourse.pangeo.io/u/jhamman)\
**Replies:** 9\
**Last updated:** [September 23, 2020, 11:12pm UTC](https://discourse.pangeo.io/t/pipelines-for-downscaling-cmip6-data/214 "2020-09-23T23:12:26Z")

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Pipelines for downscaling CMIP6 Scientific Motivation Statistical downscaling and post-processing have been a part of both weather forecasting and climate modeling applications for decades. These statistical techniques a…

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## [Cloud Example: 3hr Precip Frequency Distribution](https://discourse.pangeo.io/t/cloud-example-3hr-precip-frequency-distribution/155)

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**Author:** [@rabernat](https://discourse.pangeo.io/u/rabernat)\
**Replies:** 1\
**Last updated:** [August 11, 2020, 5:28pm UTC](https://discourse.pangeo.io/t/cloud-example-3hr-precip-frequency-distribution/155 "2020-08-11T17:28:15Z")

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I know many people are curious about the Pangeo cloud-based environment and what a real hackathon project might look like there. We are working on a comprehensive contributor guide, which will give some guidelines on how…

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## [The CMIP6 Data for our Hackathon](https://discourse.pangeo.io/t/the-cmip6-data-for-our-hackathon/73)

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**Author:** [@naomi-henderson](https://discourse.pangeo.io/u/naomi-henderson)\
**Replies:** 7\
**Last updated:** [March 24, 2020, 12:30pm UTC](https://discourse.pangeo.io/t/the-cmip6-data-for-our-hackathon/73 "2020-03-24T12:30:19Z")

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This topic is for discussing the CMIP6 collection and the various resources for identifying and requesting data for your projects.

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## [XGCM: Your friend and helper for naughty grids](https://discourse.pangeo.io/t/xgcm-your-friend-and-helper-for-naughty-grids/262)

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**Author:** [@jbusecke](https://discourse.pangeo.io/u/jbusecke)\
**Replies:** 10\
**Last updated:** [February 25, 2020, 9:02pm UTC](https://discourse.pangeo.io/t/xgcm-your-friend-and-helper-for-naughty-grids/262 "2020-02-25T21:02:49Z")

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XGCM: Your friend and helper for naughty grids I am seeing many fantastic science projects emerging for the hackathon (so many I am already dreading to decide in a few days). I would like to add a project that is techni…

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## [CESM Large Ensemble Analysis](https://discourse.pangeo.io/t/cesm-large-ensemble-analysis/259)

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**Author:** [@jhamman](https://discourse.pangeo.io/u/jhamman)\
**Replies:** 7\
**Last updated:** [December 16, 2019, 5:48am UTC](https://discourse.pangeo.io/t/cesm-large-ensemble-analysis/259 "2019-12-16T05:48:19Z")

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We just announced that the CESM Large Ensemble Project is available on AWS as part of the Public Datasets Program. See below for a quick blog post describing the effort to publish this dataset and reproduce some figures …

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## [Decadal to multi-decadal forcing on precipitation and soil moisture in CMIP6 vs. observations](https://discourse.pangeo.io/t/decadal-to-multi-decadal-forcing-on-precipitation-and-soil-moisture-in-cmip6-vs-observations/241)

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**Author:** [@amv10070](https://discourse.pangeo.io/u/amv10070)\
**Replies:** 1\
**Last updated:** [October 22, 2019, 1:25pm UTC](https://discourse.pangeo.io/t/decadal-to-multi-decadal-forcing-on-precipitation-and-soil-moisture-in-cmip6-vs-observations/241 "2019-10-22T13:25:49Z")

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\#Decadal to multi-decadal forcing on precipitation and soil moisture in CMIP6 vs. observations Scientific Motivation Understanding oceanic and atmospheric forcing on regions around the world, and on what time scales, ar…

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## [Do tropical cyclones from highresMIP simulations behave consistently with prior stochastic TC emulators?](https://discourse.pangeo.io/t/do-tropical-cyclones-from-highresmip-simulations-behave-consistently-with-prior-stochastic-tc-emulators/119)

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**Author:** [@bolliger32](https://discourse.pangeo.io/u/bolliger32)\
**Replies:** 4\
**Last updated:** [October 18, 2019, 5:41pm UTC](https://discourse.pangeo.io/t/do-tropical-cyclones-from-highresmip-simulations-behave-consistently-with-prior-stochastic-tc-emulators/119 "2019-10-18T17:41:37Z")

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Do tropical cyclones from highresMIP simulations behave consistently with prior stochastic TC emulators? Scientific Motivation Most GCMs are unable to represent observed characteristics of tropical cyclones (TCs), e.g. f…

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## [Assessment tools for lossy compression of geoscientific data](https://discourse.pangeo.io/t/assessment-tools-for-lossy-compression-of-geoscientific-data/217)

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**Author:** [@kmpaul](https://discourse.pangeo.io/u/kmpaul)\
**Replies:** 10\
**Last updated:** [October 16, 2019, 5:20pm UTC](https://discourse.pangeo.io/t/assessment-tools-for-lossy-compression-of-geoscientific-data/217 "2019-10-16T17:20:02Z")

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Assessment tools for lossy compression of geoscientific data Scientific Motivation With data volumes increasing dramatically from both observations and numerical models, compression is increasingly necessary. In the pas…

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## [Atmospheric temperature trends under increasing CO2: contrasting CMIP5 and CMIP6 models](https://discourse.pangeo.io/t/atmospheric-temperature-trends-under-increasing-co2-contrasting-cmip5-and-cmip6-models/172)

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**Author:** [@polvani](https://discourse.pangeo.io/u/polvani)\
**Replies:** 7\
**Last updated:** [October 16, 2019, 8:21pm UTC](https://discourse.pangeo.io/t/atmospheric-temperature-trends-under-increasing-co2-contrasting-cmip5-and-cmip6-models/172 "2019-10-16T20:21:24Z")

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Atmospheric temperature trends under increasing CO2: contrasting CMIP5 and CMIP6 models Scientific motivation it has been widely reported that the CMIP6 models have much higher climate sensitivity that the CMIP5 models. …

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## [Response of tropical Pacific SSTs to climate forcing in CMIP6](https://discourse.pangeo.io/t/response-of-tropical-pacific-ssts-to-climate-forcing-in-cmip6/227)

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**Author:** [@rcjwills](https://discourse.pangeo.io/u/rcjwills)\
**Replies:** 4\
**Last updated:** [October 16, 2019, 7:26pm UTC](https://discourse.pangeo.io/t/response-of-tropical-pacific-ssts-to-climate-forcing-in-cmip6/227 "2019-10-16T19:26:40Z")

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Response of tropical Pacific SSTs to climate forcing in CMIP6 Scientific Motivation The gradient of sea-surface temperatures (SSTs) between the western and eastern equatorial Pacific, with warmer temperatures in the west…

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## [Plotting ocean variables in density coordinates (using xhistogram)](https://discourse.pangeo.io/t/plotting-ocean-variables-in-density-coordinates-using-xhistogram/125)

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**Author:** [@cspencerjones](https://discourse.pangeo.io/u/cspencerjones)\
**Replies:** 25\
**Last updated:** [October 16, 2019, 7:16pm UTC](https://discourse.pangeo.io/t/plotting-ocean-variables-in-density-coordinates-using-xhistogram/125 "2019-10-16T19:16:04Z")

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Plotting ocean variables in density space (using xhistogram) Scientific Motivation Most of the ocean variables in the CMIP6 dataset are in z-coordinates (like the overturning in the top panel of the figure below). But th…

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## [Hackathon Operating Guide](https://discourse.pangeo.io/t/hackathon-operating-guide/288)

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**Author:** [@rabernat](https://discourse.pangeo.io/u/rabernat)\
**Replies:** 3\
**Last updated:** [October 16, 2019, 4:57pm UTC](https://discourse.pangeo.io/t/hackathon-operating-guide/288 "2019-10-16T16:57:00Z")

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This post will serve as the official operating guide for hackathon participants. Table of contents: Team structure Git / GitHub Setup Cloud vs Cheyenne, how to choose? How to browse the data catalogs and load data Gui…

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## [How do CMIP6 models simulate future changes in the terrestrial carbon cycle?](https://discourse.pangeo.io/t/how-do-cmip6-models-simulate-future-changes-in-the-terrestrial-carbon-cycle/271)

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**Author:** [@katiedagon](https://discourse.pangeo.io/u/katiedagon)\
**Replies:** 2\
**Last updated:** [October 16, 2019, 3:54pm UTC](https://discourse.pangeo.io/t/how-do-cmip6-models-simulate-future-changes-in-the-terrestrial-carbon-cycle/271 "2019-10-16T15:54:13Z")

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How do CMIP6 models simulate future changes in the terrestrial carbon cycle? Scientific Motivation Uncertainties in projections of atmospheric carbon dioxide concentrations are largely driven by uncertainties in the land…

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## [Explicitly support CMIP6 Decadal Prediction (DCPP) output in climpred](https://discourse.pangeo.io/t/explicitly-support-cmip6-decadal-prediction-dcpp-output-in-climpred/128)

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**Author:** [@bradyrx](https://discourse.pangeo.io/u/bradyrx)\
**Replies:** 3\
**Last updated:** [October 16, 2019, 3:37pm UTC](https://discourse.pangeo.io/t/explicitly-support-cmip6-decadal-prediction-dcpp-output-in-climpred/128 "2019-10-16T15:37:43Z")

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Explicit Support of DCPP Output for CMIP6 in climpred Scientific Motivation Decadal climate prediction is an emerging field that initializes Earth System Models (ESMs) and integrates forward an ensemble forecast for mont…

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## [Pangeo Tools Repo](https://discourse.pangeo.io/t/pangeo-tools-repo/297)

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**Author:** [@jhamman](https://discourse.pangeo.io/u/jhamman)\
**Replies:** 0\
**Last updated:** [October 16, 2019, 3:32pm UTC](https://discourse.pangeo.io/t/pangeo-tools-repo/297 "2019-10-16T15:32:40Z")

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@rabernat and and I have put together a high-level overview of the Pangeo Tools ecosystem. The presentation is an interactive Jupyter Notebook (presented via RISE). Check it out: Repo: https://github.com/pangeo-data/pa…

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## [JupyterHub access on Cheyenne](https://discourse.pangeo.io/t/jupyterhub-access-on-cheyenne/253)

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**Author:** [@jukent](https://discourse.pangeo.io/u/jukent)\
**Replies:** 8\
**Last updated:** [October 16, 2019, 3:03pm UTC](https://discourse.pangeo.io/t/jupyterhub-access-on-cheyenne/253 "2019-10-16T15:03:59Z")

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JupyterHub access on Cheyenne Step 1: Navigate to https://jupyterhub.ucar.edu/. Step 2: Launch your server, select from: - Cheyenne Supercomputer (i.e., the batch nodes) - Casper DAV (Analysis machine) You may hav…

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## [Precipitation and its changes with warming in CMIP6](https://discourse.pangeo.io/t/precipitation-and-its-changes-with-warming-in-cmip6/257)

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**Author:** [@apendergrass](https://discourse.pangeo.io/u/apendergrass)\
**Replies:** 4\
**Last updated:** [October 16, 2019, 8:18am UTC](https://discourse.pangeo.io/t/precipitation-and-its-changes-with-warming-in-cmip6/257 "2019-10-16T08:18:18Z")

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Precipitation and its changes with warming in CMIP6 Scientific Motivation Precipitation is a key variable driving and responding to atmosphere, ocean, and land surface climate. What are some key aspects of precipitation,…

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## [Eastern Pacific SST Trends in CMIP6 vs. Observations](https://discourse.pangeo.io/t/eastern-pacific-sst-trends-in-cmip6-vs-observations/200)

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**Author:** [@rabernat](https://discourse.pangeo.io/u/rabernat)\
**Replies:** 4\
**Last updated:** [October 16, 2019, 3:16am UTC](https://discourse.pangeo.io/t/eastern-pacific-sst-trends-in-cmip6-vs-observations/200 "2019-10-16T03:16:03Z")

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Eastern Pacific SST Biases and Trends in CMIP6 vs. Observations Scientific Motivation The Eastern Tropical Pacific is one of the most important regions in the world in terms of climate variability and teleconnections. Wh…

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## [Southern Ocean bottom water and sea ice in CMIP6 models](https://discourse.pangeo.io/t/southern-ocean-bottom-water-and-sea-ice-in-cmip6-models/224)

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**Author:** [@s-ragen](https://discourse.pangeo.io/u/s-ragen)\
**Replies:** 10\
**Last updated:** [October 15, 2019, 11:38pm UTC](https://discourse.pangeo.io/t/southern-ocean-bottom-water-and-sea-ice-in-cmip6-models/224 "2019-10-15T23:38:51Z")

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Southern Ocean bottom water and sea ice in CMIP6 models This is a topic that Lettie Roach and I are proposing together at UW. Scientific Motivation: The circulation in the Southern Ocean is important for global climate,…

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## [What determines Ocean Heat Uptake in CMIP6 Models?](https://discourse.pangeo.io/t/what-determines-ocean-heat-uptake-in-cmip6-models/246)

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**Author:** [@hansialice](https://discourse.pangeo.io/u/hansialice)\
**Replies:** 2\
**Last updated:** [October 15, 2019, 8:53pm UTC](https://discourse.pangeo.io/t/what-determines-ocean-heat-uptake-in-cmip6-models/246 "2019-10-15T20:53:39Z")

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Subpolar Ocean Heat Uptake in CMIP6 Models: Mechanisms, Hemispheric Asymmetry, and Radiative Feedbacks Scientific Motivation Ocean heat uptake is fundamentally a coupled atmosphere-ocean problem: how do the dynamics of t…

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## [Ocean oxygen in a warming world](https://discourse.pangeo.io/t/ocean-oxygen-in-a-warming-world/68)

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**Author:** [@matt-long](https://discourse.pangeo.io/u/matt-long)\
**Replies:** 12\
**Last updated:** [October 15, 2019, 3:24am UTC](https://discourse.pangeo.io/t/ocean-oxygen-in-a-warming-world/68 "2019-10-15T03:24:46Z")

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Ocean oxygen in a warming world Scientific Motivation Observations indicate that the ocean is losing oxygen and models suggest that this will accelerate under persistent climate warming. Current indications are, however,…

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## [Sensitivity of sea ice to changes in air temperature](https://discourse.pangeo.io/t/sensitivity-of-sea-ice-to-changes-in-air-temperature/261)

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**Author:** [@smithmadisonm](https://discourse.pangeo.io/u/smithmadisonm)\
**Replies:** 2\
**Last updated:** [October 10, 2019, 3:55pm UTC](https://discourse.pangeo.io/t/sensitivity-of-sea-ice-to-changes-in-air-temperature/261 "2019-10-10T15:55:27Z")

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Sensitivity of sea ice to changes in air temperature Topic proposed by myself, Katie Brennan, and Robin Clancy at UW Scientific Motivation The state of global sea ice is strongly related to changes in global mean temper…

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## [Ocean Carbon Uptake and Productivity in the CMIP6 Ensemble](https://discourse.pangeo.io/t/ocean-carbon-uptake-and-productivity-in-the-cmip6-ensemble/193)

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**Author:** [@yassir.eddebbar](https://discourse.pangeo.io/u/yassir.eddebbar)\
**Replies:** 10\
**Last updated:** [October 10, 2019, 1:49pm UTC](https://discourse.pangeo.io/t/ocean-carbon-uptake-and-productivity-in-the-cmip6-ensemble/193 "2019-10-10T13:49:19Z")

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Ocean Carbon Uptake and Productivity in The CMIP6 Ensemble Scientific Motivation The invasion of anthropogenic carbon and heat into the upper ocean is expected to continue into the 21st century, raising major concerns fo…

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## [Sample Models like Observations](https://discourse.pangeo.io/t/sample-models-like-observations/95)

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**Author:** [@pochedley](https://discourse.pangeo.io/u/pochedley)\
**Replies:** 9\
**Last updated:** [October 9, 2019, 2:33pm UTC](https://discourse.pangeo.io/t/sample-models-like-observations/95 "2019-10-09T14:33:50Z")

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Sample Models Like Observations Scientific Motivation Model geophysical fields are not always directly comparable to observations. Observations have limited spatial sampling (e.g., we do not have surface temperature obse…

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## [Testing model representation of seasonal air-sea exchange of O2 and CO2](https://discourse.pangeo.io/t/testing-model-representation-of-seasonal-air-sea-exchange-of-o2-and-co2/232)

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**Author:** [@brittstephens](https://discourse.pangeo.io/u/brittstephens)\
**Replies:** 3\
**Last updated:** [October 8, 2019, 11:05pm UTC](https://discourse.pangeo.io/t/testing-model-representation-of-seasonal-air-sea-exchange-of-o2-and-co2/232 "2019-10-08T23:05:09Z")

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Testing model representation of seasonal air-sea exchange of O2 and CO2 Scientific Motivation The processes driving air-sea CO2 exchange are not understood well enough to support predictions of future atmospheric CO2 tre…

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## [Public-Facing Tool Summarizing Local CMIP6 Projections](https://discourse.pangeo.io/t/public-facing-tool-summarizing-local-cmip6-projections/239)

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**Author:** [@czarakas](https://discourse.pangeo.io/u/czarakas)\
**Replies:** 2\
**Last updated:** [October 7, 2019, 3:46pm UTC](https://discourse.pangeo.io/t/public-facing-tool-summarizing-local-cmip6-projections/239 "2019-10-07T15:46:00Z")

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Public-Facing Tool Summarizing Local CMIP6 Projections Scientific Motivation Decision makers and the general public are often most interested in what cutting-edge climate projections mean for a specific location. However…

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