[MITgcm-support] Questions about the seaice pkg（SEAICE_ mcPheePiston）

[Martin Losch]

Hi again,

I think the error message is self-explanatory, you should have
0 < SEAICE_ mcPheePiston < drF(1)/SEAICE_deltaTtherm
and from SEAICE_PARAMS.h:
C     SEAICE_mcPheePiston:: ocean-ice turbulent flux "piston velocity" (m/s)
C                           that sets melt efficiency.
it basically means that the piston velocity cannot be larger than it takes to travel throught the top layer within one timestep. To be honest, I don’t know what the proper values for this parameter is supposed to be. It’s a tuning parameter and the larger it is, the faster ice melts from below.

I am sure I understand the second question. The model variable “AREA” is a bad name, becaues it is really fractional area (0-1) or concentration/100, so that initial conditions for this field can be only between 0 and 1 for earch grid cell. Everything else depends on the number of grid points and the grid spacing.

Martin

> On 30. Oct 2020, at 04:37, 张昊昊 <191311040038 at hhu.edu.cn> wrote:
> 
> Professor Martin：
>           First of all, Thank you very much for your patient answers every time. As the picture in the last email may not be displayed, I sent it again.
>           I encountered some problems when conducting the '1D_ocean_ice_column' experiment.I changed the    number of vertical layers from 23 to 60，and then there was an error in the calculation（See below）. So I want to know how to  adjust 'SEAICE_mcPheePiston' to be correct.
> 
>                      The error message is as follows：
> 
>                      SEAICE_ CHECK: SEAICE_ mcPheePiston is out of bounds ,
>                      SEAICE_ CHECK: They must lie within 0. and drF(1) /SEAICE_ deltaTtherm 
>                      ABNORMAL END: S/R SEAICE_ CHECK
> 
>    My other question is what is the specific value of the sea ice area in this experiment. For example, if I want to change the initial sea ice area from 1 square meter to 100 square meters, what should I do.
>       I am looking forward to your help and I wish you good health and good luck in everything！ 
>                                                                                                                                        yours 
>                                                                                                                                        ZhangHaohao
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