Historical spin up using GSWP3-W5E5 data before 1979

[ingrafaria]

Hi everyone,
I'm a master student at the Technical University of Munich and am working with OGGM for a research project.
I need to run a historical spin-up from the period of 1901-1970, with the GSWP3-W5E5 climate dataset, but am encountering difficulties with it.

OGGM's climate data documentation (https://docs.oggm.org/en/latest/climate-data.html) mentions that, GSWP3-W5E5 is a combination of W5E5 v2.0 [Lange_et_al_2021] for 1979-2019 with GSWP3 v1.09 [Kim_2017] homogenized to W5E5 for 1901-1978. Note that the baseline url file paths are only named W5E5 to make it shorter, however they include both, GSWP3 and W5E5 data.

I'm currently stuck in this loop:

>>> tasks.process_w5e5_data(gdirs, y0=1901, y1=2020)

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ingra/miniforge3/envs/oggm_env/lib/python3.11/site-packages/oggm/shop/w5e5.py", line 259, in process_w5e5_data
    raise InvalidParamsError(text)
oggm.exceptions.InvalidParamsError: The W5E5 climate only goes from 1979-2019,if you want older climate data,use instead "process_gswp3_w5e5_data()"

>>> tasks.process_gswp3_w5e5_data(gdirs, y0=1901, y1=2020)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'oggm.tasks' has no attribute 'process_gswp3_w5e5_data'. Did you mean: 'process_w5e5_data'?

When I checked the task "process_w5e5_data" in the documentation (https://docs.oggm.org/en/stable/generated/oggm.tasks.process_w5e5_data.html), I found that it calls internally for process_gswp3_w5e5_data but only for the W5E5 part, limiting the starting year to 1979.

It seemed a bit counterintuitive for me that the climate data mentions GSWP3 as a dataset starting in 1901, but the task doesn't allow its use for a spin up before 1979.

Could anybody please help a begginer with some insights on what I might be doing wrong or if it's indeed not possible?

Thank you!

[pat-schmitt]

Hi, nice that you use OGGM for your research project!

The problem is that process_gswp3_w5e5_data is not included in the oggm tasks. You still can use it with the following code:

from oggm.shop.w5e5 import process_gswp3_w5e5_data
workflow.execute_entity_task(process_gswp3_w5e5_data, gdirs, y0=1901, y1=2019)

Having said this, if you have further questions please consider joining the OGGM slack channel: https://community.oggm.org/guides/slack-intro.html, it is the right place to ask user questions in the #support channel. Github is meant to be used for model development and bug reports.