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CMIP6 WITHOUT THE INTERPOLATION GRID-NATIVE ANALYSIS WITH PANGEO IN THE CLOUD JULIUS BUSECKE | RYAN ABERNATHEY

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EYRING ET AL., BOM 2003. … Each “MIP” consists of many numerical models

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SLOW AND STORAGE INTENSIVE TYPICAL WORKFLOW Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰

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SLOW AND STORAGE INTENSIVE TYPICAL WORKFLOW Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset (~600TB)

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SLOW AND STORAGE INTENSIVE TYPICAL WORKFLOW Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset (~600TB)

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CURVILINEAR GRIDS DELANDMETER AND VAN SEBILLE, 2019 X0 , Y0 X1 , Y1 X2 , Y2 X3 , Y3 u0 u1 v0 v1 T0 F0 F1 F2 F3 x,y x y ⇠ ⌘ 0, 0 1, 0 1, 1 0, 1 F0 F1 F2 F3 U0 U1 V0 V1 T0 ⇠,⌘ (a) (b) ENES.ORG

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X Not too complicated but tedious and error prone

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COMPUTING A DERIVATIVE XGCM DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM Starting from xarray dataset DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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COMPUTING A DERIVATIVE XGCM Starting from xarray dataset Create a `grid` object DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X

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DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X COMPUTING A DERIVATIVE XGCM

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DELANDMETER AND VAN SEBILLE, 2019 u, v, T u v T & ` ' A ep g b j 1 j 1 j j j + 1 j + 1 j + 2 i 1 i 1 i i i + 1 i + 1 Axis:Y axis:X COMPUTING A DERIVATIVE XGCM Currently supported operations: difference interpolation cumulative sum min/max average integral cumulative integral derivative

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CMIP6_PREPROCESSING

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CMIP6_PREPROCESSING consistent renaming

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CMIP6_PREPROCESSING consistent renaming

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CMIP6_PREPROCESSING consistent renaming

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CMIP6_PREPROCESSING consistent renaming

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CMIP6_PREPROCESSING consistent renaming homogenize units

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CMIP6_PREPROCESSING consistent renaming homogenize units consistent longitude convention

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CMIP6_PREPROCESSING consistent renaming homogenize units xgcm grids consistent longitude convention

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Sea Surface Temperature Gradient Magnitude

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Sea Surface Temperature Gradient Magnitude

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SPENDING TIME ON DISCOVERY NOT PREPROCESSING Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset

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SPENDING TIME ON DISCOVERY NOT PREPROCESSING Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset

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SPENDING TIME ON DISCOVERY NOT PREPROCESSING Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset cmip6_preprocessing

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SPENDING TIME ON DISCOVERY NOT PREPROCESSING Download Data ⏰ Apply Analysis Discovery Regrid Data ⏰ Homogenize Data ⏰ Pangeo’s CMIP6 Google Cloud Public Dataset cmip6_preprocessing ❤

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@JULIUSBUSECKE [email protected] INTERESTED? JOIN US ON GITHUB! HTTPS://XGCM.READTHEDOCS.IO/ HTTPS://GITHUB.COM/JBUSECKE/CMIP6_PREPROCESSING HTTPS://GITHUB.COM/XGCM/XGCM Check out the full tutorial in the Earthcube notebook: HTTPS://GITHUB.COM/EARTHCUBE2020/EC20_BUSECKE_ETAL