“First Steps in Biosphere-Atmosphere Modelling”

In this course, everyone programs an atmospheric boundary layer model, to which we then add chemistry (chemical reactions, mixing of chemicals between model layers), emission of volatile organic compounds (BVOCs) from vegetation, deposition of gases and aerosols, and aerosol formation and growth inside the boundary layer.

So this is a programming project course.

Why we need this course?• Climate change and air quality are serious threats to the Earth´s future and

human wellbeing. • At high latitudes in the Arctic climate change has proceeded fastest, with its

near-surface warming being about twice the global average during the recent decades.

• These changes have dramatic impacts on the ecology and societies of the Arctic, underlining the urgent need for a better understanding of the processes leading to climate change.

• Assessment of these research topics require a multi-disciplinary research effort to integrate available observations and knowledge to further develop and improve multi-scale and multi-component model systems (e.g. land-atmosphere interactions).

• The course "First steps in atmospheric modelling" focuses on the education of the "Next Generation of Atmosphere Modellers" and will provide a strong basic education in biological, chemical and physical atmospheric processes and their numerical solutions

Why we need this course?

Contents • Introduction• What is good coding?• Fortran• Boundary layer meteorology• Advanced numerical techniques • Atmospheric chemistry (Michael)• Emission of natural and anthropogenic gases• Applications of the 1-D model • Regional and Earth System Models (ESMs)• Aerosol dynamics• Deposition of gases and aerosols

Tutorials(Hold Shift + ? or Ctrl, then click)

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Main Code

Module 3

Module 4

Task 1

Task 2

Task 3

Module 2

Subroutine

Module 1

Boundary Layer

Meteorology

Model Version

3

Nucleation

Emissions

Modelling course Mind map

Model Version

2

Model Version

1

Chemistry Box

model

- Calculate concentration change of compounds.

- Code equation for vertical fluxes and transport of chemical species and energy.

- Calculate emissions for ?-pinene and isoprene.

Aerosol Box

Model

Condensation

Coagulation

- Calculate concentration change of compounds.

Deposition

- Calculate the dry deposition of gases and particles.

- This is where all the modules come together.

- Here we combine import Chemisty, Aerosol and deposition module and couple it to the Boundary layer module to mix the gases and species throught out the boundary layer

Contents – flow chart

Credits

• 5 ECTS by University of Helsinki or Lund University• No grades – only pass or fail

• Examination– Report on scientific tasks which will be provided during the

course (different simulations with your model) – Developed computational code

Deposition- gaseous compounds - aerosols