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Re: [ferret_users] conversion of decibars to metre depth in sea water



hi, Russ and ferreters

i came across with a similar post from James Orr http://www.pmel.noaa.gov/maillists/tmap/ferret_users/fu_2017/msg00042.html. i coded the way he suggested and with the reference he provided.

and this my output for depth (m) from decibars.  Now I want to use this axis in my data as the Z axis. So i need help in doing this operation.


dbars             meters
 2.5     /  1:     2.480
 10      /  2:     9.919
 20      /  3:    19.838
 30      /  4:    29.756
 40      /  5:    39.673
 50      /  6:    49.590
 60      /  7:    59.507
 70      /  8:    69.423
 80      /  9:    79.339
 90      / 10:    89.254
 100     / 11:    99.169
 110     / 12:   109.083
 120     / 13:   118.997
 130     / 14:   128.910
 140     / 15:   138.823
 150     / 16:   148.735
 160     / 17:   158.647
 170     / 18:   168.558
 182.5   / 19:   180.947
 200     / 20:   198.290
 220     / 21:   218.108
 240     / 22:   237.925
 260     / 23:   257.739
 280     / 24:   277.552
 300     / 25:   297.363
 320     / 26:   317.171
 340     / 27:   336.978
 360     / 28:   356.783
 380     / 29:   376.587
 400     / 30:   396.388
 420     / 31:   416.187
 440     / 32:   435.985
 462.5   / 33:   458.255
 500     / 34:   495.366
 550     / 35:   544.837
 600     / 36:   594.296
 650     / 37:   643.743
 700     / 38:   693.179
 750     / 39:   742.603
 800     / 40:   792.015
 850     / 41:   841.415
 900     / 42:   890.804
 950     / 43:   940.180
 1000    / 44:   989.546
 1050    / 45:  1038.899
 1100    / 46:  1088.241
 1150    / 47:  1137.571
 1200    / 48:  1186.889
 1250    / 49:  1236.196
 1300    / 50:  1285.492
 1350    / 51:  1334.775
 1412.5  / 52:  1396.364
 1500    / 53:  1482.557
 1600    / 54:  1581.021
 1700    / 55:  1679.438
 1800    / 56:  1777.810
 1900    / 57:  1876.136
 1975    / 58:  1949.851

regards,saurabh

On Fri, Mar 3, 2017 at 1:34 PM, Russ Fiedler <russell.fiedler@xxxxxxxx> wrote:
Hi Saurabh,

You'll need the density information in order to integrate 1/(g*rho) from the surface downwards and then use ZAXREPLACE to map to the z axis.
If you have the salinity information then use the function RHO_UN.

Russ


On 03/03/17 11:49, saurabh rathore wrote:
HI Ferreters

I was wondering that do ferret/pyferret is having any function to convert depth in decibars to depth in meters. As I am having ocean temperature data in decibars along Z axis i just want to convert this pressure axis to metre axis i.e. Z axis of decibars to Z axis of meters.

yes? sh da
     currently SET data sets:
    1> ./temp_rg.nc  (default)
 name     title                                                  I         J             K         L          M         N
 TEMP     TEMP_RG[L=100]                   1:360     1:130     1:58      1:152     ...       ...
 
yes? sh gr temp
    GRID GJF1
 name       axis                           # pts                     start                      end                       subset
 LONGITUDE LONGITUDE      360mr                  20.5E                  19.5E(379.5)             full
 LATITUDE  LATITUDE            130 r                  64.5S                     64.5N                       full
 PRESSURE  DEPTH (dbar)    58 i-                      2.5                      1975                         full
 TIME      TIME                          152 i   16-JAN-2004 05:14       16-AUG-2016 04:28        full
 normal    E
 normal    F


​regards, saurabh​

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REGARDS

Saurabh Rathore
Research Scholar (PhD.)
Centre For Oceans, Rivers, Atmosphere & Land Science Technology
Indian Institute Of Technology, Kharagpur
contact :- 91- 8345984434





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REGARDS

Saurabh Rathore
Research Scholar (PhD.)
Centre For Oceans, Rivers, Atmosphere & Land Science Technology
Indian Institute Of Technology, Kharagpur
contact :- 91- 8345984434

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