NEXUS

This is the NOAA Emission and Exchange Unified System (NEXUS)

Development

Clone the repository and check out the submodules:

git clone -b develop --recurse-submodules https://github.com/noaa-oar-arl/NEXUS.git

or

git clone -b develop --recurse-submodules git@github.com:noaa-oar-arl/NEXUS.git

(Replace noaa-oar-arl/NEXUS with your fork if desired.)

To install the pre-commit hooks, first install pre-commit, e.g. to your Conda environment. Then, run

pre-commit install --install-hooks

Setup

NOAA Hera

Use the official setup.

module use ./modulefiles
module load hera.intel

Input data:

/scratch1/NCEPDEV/rstprod/nexus_emissions

/scratch1/RDARCH/rda-arl-gpu/Barry.Baker/emissions/nexus

GMU Hopper

. /groups/ESS3/zmoon/nexus/env5

Input data:

/groups/ESS3/ytang/RRFS-input/nexus_emissions

Ubuntu

Tested with Ubuntu 22.04. Using GCC v12 available via apt.

Dependencies:

sudo apt install build-essential gfortran-12 libnetcdf-dev libnetcdff-dev liblapack-dev libopenblas-dev mpi-default-dev mpi-default-bin

Build ESMF and prepare for NEXUS build:

v="8.3.1"  # ESMF
gcc="12"
esmf_base=$HOME/esmf

export ESMF_DIR=${esmf_base}/${v}-gcc-${gcc}
cd $esmf_base
mkdir -p $ESMF_DIR
wget https://github.com/esmf-org/esmf/archive/refs/tags/v${v}.tar.gz
tar xzvf v${v}.tar.gz --directory=/tmp && mv /tmp/esmf-${v}/* $ESMF_DIR

export ESMF_COMPILER=gfortran
export ESMF_LAPACK=netlib
export ESMF_COMM=mpi
export ESMF_PIO=internal
export ESMF_NETCDF=nc-config

export OMPI_FC=gfortran-${gcc}
export OMPI_CC=gcc-${gcc}
export OMPI_CXX=g++-${gcc}
export ESMF_F90COMPILER=mpifort
export ESMF_CCOMPILER=mpicc
export ESMF_CXXCOMPILER=mpic++
export ESMF_F90LINKER=/usr/bin/ld
export ESMF_CLINKER=/usr/bin/ld
export ESMF_CXXLINKER=/usr/bin/ld

cd $ESMF_DIR
make lib

# Location of the corresponding `esmf.mk` is needed for CMake to find the lib later
# You can find these with, e.g., `find . -name 'esmf.mk' -exec realpath {} \;`,
# but it should be the following:
ESMFMKFILE=${ESMF_DIR}/lib/libO/Linux.gfortran.64.mpi.default/esmf.mk

# For NEXUS
export CMAKE_Fortran_COMPILER=$ESMF_F90COMPILER

To build NEXUS, at least these env vars should be set:

• ESMFMKFILE
• OMPI_FC
• CMAKE_Fortran_COMPILER

Build

cmake -S . -B build

cmake --build build

If successful, the executable will be at build/bin/nexus.

To clean up, remove the build directory or use

cmake --build build --target clean