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PyWBGT_analytic

The model developed by Liljegren et al (2008) [1] is the recommended approach for esmating wet-bulb globe temperature (WBGT) [2], but it requires iterative calculation from solving the nonlinear enegy balance equations of the wet wick and black globe sensors. By carefully exmaining self-nonlinearities in Liljegren's model, we develop an analytic WBGT approximation that doesn't require iteration while maintaining high accuracy and most of the physics of Liljegren's model.

What is in this repository?

  • WBGT_analytic.py: Python script for calculating the analytic approximation of WBGT.
  • coszenith.pyx: Cython code for calculating cosine zenith angle as develped by Kong and Huber (2022) [3]
  • setupcoszenith.py: Python setup tool script for compiling coszenith.pyx
  • Calculate_analytic_WBGT_with_CMIP6_data.ipynb: A jupyter nobtebook introducing the usage of our code.
  • environment.yml: a YAML file that can be used to build conda environment containing all needed python packages.

How to compile Cython code for calculating cosine zenith angle

coszenith.pyx need to be compiled first to obtain a shared object file .so that can be import in Python. The setup tool script setupcoszenith.py is used for such purpose:

  • for Intel compiler:
    • LDSHARED="icc -shared" CC=icc python setupcoszenith.py develop
  • for gcc compiler:
    • replace '-qopenmp' with '-fopenmp' in the setupcoszenith.py file.
    • python setupcoszenith.py build_ext --inplace

Citation

If you want to use our code, please consider cite upcoming

References

[1] Liljegren JC, Carhart RA, Lawday P, Tschopp S, Sharp R. Modeling the wet bulb globe temperature using standard meteorological measurements. J Occup Environ Hyg. 2008;5(10):645-55.

[2] Lemke B, Kjellstrom T. Calculating workplace WBGT from meteorological data: a tool for climate change assessment. Ind Health. 2012;50(4):267-78.

[3] Kong, Q. & Huber, M. Explicit calculations of Wet Bulb Globe Temperature compared with approximations and why it matters for labor productivity. Earth’s Future (2022) doi:10.1029/2021EF002334.