mathomp4

Setting up uv on Discover

This setup keeps uv, its cache, managed Python installations, and tools on $NOBACKUP storage instead of in your home directory.

Configure uv

Add the following to ~/.bashrc:

mathomp4

MERRA-2 Zonal Mean File Conversion Analysis

Executive Summary

This document details the reverse-engineering analysis of how 3D MERRA-2 NetCDF files (on a $576 \times 361 \times 72$ grid) are processed to produce the corresponding zonal-mean files (MERRA-2.inst3_3d_asm_Nv.monthly.YYYYMM.0001x0091x0072.nc4 on a $1 \times 91 \times 72$ grid), specifically focusing on ozone ($O_3$/$OX$).

It includes comparison between two input sources:

1. Pre-made Monthly Means (MERRA-2.inst3_3d_asm_Nv.monthly.YYYYMM.nc4)
2. Daily Instantaneous Files (MERRA2_400.inst3_3d_asm_Nv.YYYYMMDD.nc4, 3-hourly, 240 timesteps/month)

The June 2012 validation changes an important earlier conclusion: the dominant difference from the canonical ozone field is a unit conversion, not numerical precision or the use of monthly rather than daily input. The canonical field is approximately the zonal mean of MERRA-2 mass mixing ratio converted to volume (mole) mixing ratio:

mathomp4

#!/usr/bin/env bash
set -euo pipefail

# ---- config ----
FLANG="${FLANG:-flang}"
FLAGS=(-O0 -g -fno-integrated-as -save-temps=obj)
OUTDIR="${OUTDIR:-obj}"
MAX=8

mkdir -p "$OUTDIR"

mathomp4

Making a Python stack with Miniforge

In the examples below, I'll mainly be using Discover at NCCS as my guide for paths, etc., but it can be genericized

Preliminary Setup

You want to make sure mamba, et al, do no cache files in your home dir as that can kill quota.

So:

mathomp4

Much of this is based on https://vivekdhami.com/post/git-move-repo-files-with-history/

0. First you need some preliminaries. If you are on a mac, you can do:

brew install git-filter-repo

If you are on discover, do:

module load python/GEOSpyD/Min4.11.0_py3.9 other/git-filter-repo

mathomp4

List of packages to install with Brew.

Some of these are needed for GEOS, Baselibs, etc. Some are things I personally just need.

Formulae

• autoconf
• autogen
• automake
• cmake

mathomp4

This bit of CMake is based off of code from Michael Hirsch (aka @scivision)

# https://www.scivision.dev/cmake-auto-gitignore-build-dir/
# --- auto-ignore build directory
if(NOT EXISTS ${PROJECT_BINARY_DIR}/.gitignore)
  file(WRITE ${PROJECT_BINARY_DIR}/.gitignore "*")
endif()

# Piggyback that file into install

mathomp4

Import GitHub labels

Based on: https://gist.github.com/cdlhub/02f59220d842b5a32d282f58bd502c11

Which was based on: https://gist.github.com/Isaddo/7efebcb673a0957b9c6f07cd14826ea4

1. Go on your labels page https://github.com/user/repo/labels
2. Paste this script in your console.
3. Press Enter.

mathomp4

module CommsMod

   implicit none
   private

   public SetDistGrid
   public CreateRequest
   public DistGrid
   public CommRequest
   public ArrayIGather