where to download the surface wind forcing field associated with GOFS 3.1

[Yang Yang]

Hi,

I found there is an new version of Global reanalysis GOFS 3.1 released at hycom.org. It's a good news that the surface wind stress of this version has taken into account the surface current effect. 

I wonder where to download the corrected wind stress field spanning 1994-01-01 to 2015-12-31 as the same period as the reanalysis covers? I found that there is no such field available at https://hycom.org/dataserver/gofs-3pt1/reanalysis. 

I'm looking forward to your kindly reply.

Thanks in advance.

Yang Yang

Lecturer, School of Marine Sciences

Nanjing University of Information Science and Technology

219 Ningliu Road, Nanjing 210044, China

Email: yangyan...@gmail.com

Tel: +86-15651999690

[alan.wa...@hycom.org]

The wind stress is calculated inside HYCOM, using a bulk parameterization with HYCOM SST and HYCOM surface (averaged over the top 2m) currents.

We write the stress out hourly, but we did not transfer these fields to the HYCOM data server.

You could in principle recalculate the wind stress every 3 hours using the provided SST and near-surface currents plus the CSFR fields interpolated to the model grid, but it would be a lot of work.

Alan.

Tel: +86-15651999690

[Michael McDonald]

Yang,

We have located the "_ice" and the "_sur" files that on the Navy storage archive that have the data you were seeking. If you are interested in the entire reanalysis time series, then this will take several days/weeks to download, unpack, and publish to hycom.org. We will set up an equivalent THREDDS aggregation catalog as the reanalysis and include these 1-hrly surface fields as a separate dataset.  If you only need the variables from the _ice files then I will start with downloading those. 

We save this in the "_ice" file:

COAPS 135> ncdump -h hycom_GLBv0.08_539_2015010112_t012_ice.nc | grep "short"

    short sst(time, lat, lon) ;

    short sss(time, lat, lon) ;

    short ssu(time, lat, lon) ;

    short ssv(time, lat, lon) ;

    short sic(time, lat, lon) ;

    short sih(time, lat, lon) ;

    short siu(time, lat, lon) ;

    short siv(time, lat, lon) ;

    short surtx(time, lat, lon) ;

    short surty(time, lat, lon) ;

This is available hourly, in daily tar bundles:

The "sur" file is also hourly and is bigger mostly because it contains floats:

COAPS 137> ncdump -h hycom_GLBv0.08_539_2015010112_t012_sur.nc | grep "float"

    float qtot(time, lat, lon) ;

    float emp(time, lat, lon) ;

    float steric_ssh(time, lat, lon) ;

    float ssh(time, lat, lon) ;

    float u_barotropic_velocity(time, lat, lon) ;

    float v_barotropic_velocity(time, lat, lon) ;

    float surface_boundary_layer_thickness(time, lat, lon) ;

    float mixed_layer_thickness(time, lat, lon) ;

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Michael McDonald
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[alan.wa...@hycom.org]

Here are the standard (or long) names for the fields:

COAPS 268> ncdump -h hycom_GLBv0.08_539_2015010112_t012_ice.nc | grep "standard_name"
        sst:standard_name = "sea_water_temperature" ;
        sss:standard_name = "sea_water_salinity" ;
        ssu:standard_name = "eastward_sea_water_velocity" ;
        ssv:standard_name = "northward_sea_water_velocity" ;
        sic:standard_name = "sea_ice_area_fraction" ;
        sih:standard_name = "sea_ice_thickness" ;
        siu:standard_name = "eastward_sea_ice_velocity" ;
        siv:standard_name = "northward_sea_ice_velocity" ;
        surtx:standard_name = "surface_downward_eastward_stress" ;
        surty:standard_name = "surface_downward_northward_stress" ;

COAPS 271> ncdump -h hycom_GLBv0.08_539_2015010112_t012_sur.nc | grep "long_name"
        qtot:long_name = "surf. heat flux" ;
        emp:long_name = "surf. water flux" ;
        steric_ssh:long_name = "steric SSH" ;
        ssh:long_name = "sea surf. height" ;
        u_barotropic_velocity:long_name = "baro. u-vel." ;
        v_barotropic_velocity:long_name = "baro. v-vel." ;
        surface_boundary_layer_thickness:long_name = "bnd.layr.thickness (KPP)" ;
        mixed_layer_thickness:long_name = "mix.layr.thickness (tmljmp=0.3 degC)" ;

The "surface stress" is ice-ocean stress under sea ice, and wind stress, as calculated by HYCOM, in ice-free regions.

Alan.

[yangyan...@gmail.com]

Hi,

I'd like to see the surtx, surty and qtot fields to be published to the hycom server. These three forcing fields are essential for air-sea interaction study together with the already uploaded oceanic fields. Considering the massive data load, I think only uploading t000 snapshot at an daily interval will meet most research needs. 

Thanks.

在 2018年8月13日星期一 UTC-4下午3:42:54，Michael McDonald写道：