Hi, Yes, You will need the @WEQ transformation along with the indefinat integral transform @IIN Example 3 here shows how to get salinity on an isotherm https://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPINDEXENTRY_532 Now, reather than salinity, you want the value of the indefinite integral so ... let isotherm_26 = temp[Z=@WEQ:26] let myvar = var[z=@iin] !!! Actually this might be wrong. There is a new transform in the latest Ferret let myvar=var[gz=var@iin] or something similar might be better. let integrand_26 = myvar * isotherm_26 ... and so on. If you computed d_26 earlier and no longer have the temperature field then we nee to create a new variable based on the depth field ad find the zero of the depth-d26 See example 5 for something similar. let zero_at_26 = z[g=integrand] - d26 let isotherm_26= zero_at_26[z=@WEQ:0] Oh yeah, You might need to replace missing values of the integrand with zero in case the temperature is >26 all the way to the sea floor. Russ On 20/08/18 16:23, Satyesh Ghetiya wrote:
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