MLD calculation

[kaushik]

Dear GOTM Users,

In Burchard 2001 JPO paper (page. 1383), it is mentioned that the 'The observed MLD is calculated as the uppermost location in the water column where the temperature is more than 0.1 Deg C lower than the SST.' My question is that what SST data and temperature data has been used to calculate MLD. Is that taken from the input data tprof.dat or tprof_ctd.


Kaushik

[Hans Burchard]

Dear Kaushik,

that is a good question 13 years after the study made during the very
early days of GOTM.

The sentence you cite is from the OWS Papa simulation section and if I
have a look into the files for ows_papa in GOTM, I only see tprof.dat as
possible data source. So, this must be the file which has been used to
calculate the MLD.

The test case where we have two measured temperature profile files
(tprof.dat and tprof_ctd.dat) is the flex test case. There, the tprof.dat
file is based on reanalysed and low pass filtered and tprof_ctd.dat files
are original data from CTD.

Hope that helps.

Kind regards, Hans.

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--
Hans Burchard
Leibniz Institute for Baltic Sea Research Warnemuende
Dept. for Physical Oceanography and Instrumentation
Seestrasse 15
D-18119 Rostock-Warnemuende
Germany

Tel. : +49 - 381 - 5197 -140
Fax : +49 - 381 - 5197 -114
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skype : hans.burchard

[Kaushik Sasmal]

Dear Hans,

 Thank you for the confirmation regarding the calculation of MLD from tprof.dat. Now, I have the sst plots from both tprof.dat (taking the first  layer) and from  the model ascii output (ows_papa.temp). The look different. Using these sst data the calculated MLD is also different. Now my question is why are they different?. Moreover, data in tprof.dat is probably not in regular interval of time.


Regards,
Kaushik

***************************************************************
Kaushik Sasmal
Dept. of Ocean Engineering and Naval Architecture
IIT Kharagpur
India -721302
****************************************************************

[Hans Burchard]

Dear Kaushik,

the SST data you compare are from different data products, one comes from
sst.dat (resolution is 0.5 K) and the other from the CTD profile file
tprof.dat. I do not know how the original data have been treated to
generate the files, but it is not surprising that there is a difference. I
would guess that the difference is largely the resolution in time and data
accuracy.

Kind regards,

Hans.