Opened 6 years ago

Last modified 6 years ago

## #94 new enhancement

# Need filter 'time-derivate' or 'tendency'

Reported by: | ssenesi | Owned by: | ymipsl |
---|---|---|---|

Priority: | minor | Component: | XIOS |

Version: | 2.0 | Keywords: | |

Cc: |

### Description

Some physical schemes may have a timestep shorter than the one used for xios_send(ing)_field.

In that case, time averaged values computed by Xios cannot be as accurate as time averaged values computed by a time-derivation on high-frequency-time-integrated values (assuming here that his time-integration is performed by the high-frequency physical scheme, at its high frequency)

This advocates for providing an Xios time-derivation operation, in addition to the already existing time-integration

### Change History (2)

### comment:1 Changed 6 years ago by ymipsl

### comment:2 Changed 6 years ago by ssenesi

I mean time derivation :

- let X(t) be the field, delivered to XIOS at t, t+dt, t+2*dt ...
- I want XIOS to compute Y(t) = dX(t)/dt , so, in details :

Y(0)=0

Y(t)=(X(t) - X(t-dt))/dt for t > 0

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Hi Stéphane,

What do you mean by time-derivation ? Time interpolation ? Could you give us a concrete example ?

Regards