Opened 4 days ago

#2150 new help

timestamp of .pa and monthly .pd files

Reported by: eelrm Owned by: um_support
Priority: normal Component: UKCA
Keywords: timestamp, STASH Cc: gmann
Platform: ARCHER UM Version: 8.4

Description

Hi,

I have found that although I simulate volcanic eruptions on July 1st, the output suggests they occur on 30th June.

I've conducted an ensemble of simulations (UKCA vn8.4 atmosphere-only, timeslice) of different sized volcanic eruptions where the eruption is specified to occur on 1st July - day 181 (30 day months).

Much of the output is set to go to monthly .pd files and when I look at the output anomaly, it is the June mean .pd file in which the volcanic perturbation is first seen. When traced back to the daily .pa files, the volcanic signal is first seen in the June 30th .pa file.

However, the 1st July dump file appears to have the same data for both volcanically perturbed and base-run simulations, indicating that the eruption, does indeed occur July 1st.

I have been informed that there could be an issue with the time-stamp being incorrect for the daily .pa files. Is the .pa file for June 30th in fact for July 1st? As we see the anomaly in the June monthly .pd file, are these monthly means also out of sync by a day?

Is there a way to fix this?

Thank you,

Best wishes,

Lauren

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