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Re: NCEP North American Reanalysis (fwd)



Hi All,

I've been able to download a subset of the NARR data (only surface-level values from a week at the 3 hour time step) from the NCDC website using the ftp4u link. It works great and I had no problems. If we also have the grib2nc conversion, we will be all set. Glenn, when do you hope to has this conversion available?

Jon Goodall
Center for Research in Water Resources
University of Texas at Austin


----Original Message Follows----
From: "Glenn Rutledge" <address@hidden>
To: Steve Worley <address@hidden>
CC: Ben Domenico <address@hidden>, David Maidment <address@hidden>, Jon Goodall <address@hidden>, "Dennis P. Lettenmaier" <address@hidden>, support-ldm <address@hidden>, Martin Benno Blumenthal <address@hidden>, Don Hooper <address@hidden>, Roland Schweitzer <address@hidden>, Robb Kambic <address@hidden>, Sharon Leduc <address@hidden>, Russell Vose <address@hidden>, Dan Swank <address@hidden>
Subject: Re: NCEP North American Reanalysis (fwd)
Date: Fri, 01 Oct 2004 09:04:49 -0400

--- Begin Message ---
  • Subject: Re: NCEP North American Reanalysis (fwd)
  • Date: Fri, 01 Oct 2004 09:04:49 -0400
Thanks Steve and Ben for your forward. 

We are now ingesting and have avbl the NARR.  We have 1987 thru 2003 (of the 1979-2004) as requested below.  NCAR and SDSC will also have copies.  Here at NCDC, Murphy got in the way as I usually have grib sub-seting capabilities,  however the RAID I expected in for this operation has not yet arrived!  I'm told the check is in the mail.  To get around this, the NOMADS team (all 2.5 of us) put together direct access http to (m)get at the data due to this hardware delay. 

So, users may access the data as per Steve's url below.  Use the http link to get at the data directories.  Depending on your internet connection, it may be a slow process (maybe open 2 ports).

By next week (or so), please point users to the "ftp4u" capability that can subset this large (5TB) dataset by parameter space and time (and by variable).   There is dataset documentation also avbl at the site. 

As I write, we are developing a grib2nc capability for users to retrieve in NetCDF format.  We will also compress the NetCDF for transmission (GFDL, Kerr) found that these NetCDF files compress very well.   Please let me know your experiences with this site and do try to subset when that's avbl.  Thanks, Glenn

Steve Worley wrote:
All,

North American Regional Reanalysis is just coming available from
two location I know of:

the NCDC NOMADS server (Glenn's work) at
http://nomads.ncdc.noaa.gov/data-access.html#narr_datasets

and NCAR through the Data Support Section.
We have 1987-2003 archived, but not fully ready for service.  However,
if you wish to let us know what you require we might be able to
accomodate your needs without too much problem.  Chi-Fan Shih
(address@hidden) can address your further questions about NARR
from NCAR.

sjw


Ben Domenico wrote:
Hi David, Jon and Dennis,

Your questions are flattering in terms of the assumed breadth and depth of knowledge about data collections here at the Unidata Program Center (UPC), but we should be honest and offer a few clarifications that will help you find what you are looking for more quickly.

The main clarification is that the staff at the UPC mainly focuses on infrastructure for real-time data systems for weather data.   I understand that archived climate information is closely related, but your questions about the details of specific archived climate datasets are skirting pretty much at and beyond the edges of our UPC expertise.  Those sorts of questions are better posed to the folk who create and maintain the climate data archives at places like the  NCDC, NCAR, Lamont-Doherty, and CDC.  I plan to send a copy of this note to Glenn Rutledge at NCDC, Benno Blumenthal at LDEO, Steve Worley at NCAR, and Don Hooper & Roland Schweitzer at CDC who should be able to help you find what you need in terms of the North American Reanalysis datasets -- in particular a netCDF version.

On the other hand, we do have experience at the UPC with decoders that transform certain GRIB datasets into netCDF form (indeed with considerably expanded size) and I'll ask Robb to follow up on that issue to see if there is a version of that (GRIBTONC) decoder for the North American Reanalysis data.

I don't mean to be passing the buck, but there are many groups who have more detailed expertise than the UPC about archives of climate datasets.

--Ben
******************************************************
  Ben Domenico                Unidata Deputy Director
  http://my.unidata.ucar.edu            P.O. Box 3000
  address@hidden              Boulder, CO 80307
  (303)497-8631                    FAX: (303)497-8690

--On Thursday, September 30, 2004 3:45 PM -0500 David Maidment <address@hidden> wrote:

Robb:

Dennis Lettenmaier is correct here.  What you are pointing us to is
the global NCEP reanalysis, which is on a 2.5 degree grid and not
very informative for the hydrology of the US.  What we are seeking
to work with is the reanalysis for North America alone, which is
on a 32km grid and is in Grib format, not netCDF.   The global
reanalysis is available in netCDF.

David


-----Original Message-----
From: Robb Kambic [mailto:address@hidden]
Sent: Thursday, September 30, 2004 11:25 AM
To: Ben Domenico
Cc: David Maidment; support-ldm
Subject: Re: NCEP North American Reanalysis (fwd)



look at url:

http://www.cdc.noaa.gov/cdc/data.ncep.reanalysis.html#surface_gauss

parameters  water runoff, soil moisture, etc.  these files are in netcdf
so they should be usuable for your analysis. i downloaded a couple of
files and dumped them using ncdump.

there are proably other hydrologic fluxes data sets that can be found by
searching the web.

robb...

On Thu, 30 Sep 2004, Ben Domenico wrote:

Hi all,

The note below from David Maidment asks about getting the NCAR
reanalysis products into netCDF form.  Is there something special
about these datasets or would our grib to netcdf decoder work with
them.  Regarding the grads part of it, I'm assuming that refers to the


fact that they are available via the GDS protocol, but let me know if
there's more to it than that.

And how about the CDC archives?  I thought they published these data
in netCDF form.

Thanks.

-- Ben

---------- Forwarded Message ----------
Date: Thursday, September 30, 2004 8:18 AM -0500
From: David Maidment <address@hidden>
To: Ben Domenico <address@hidden>
Subject: NCEP North American Reanalysis


Ben:

In CUAHSI HIS, we are thinking that a good "coverage" of hydrologic
fluxes from the atmosphere could be obtained from the NCEP North
American Reanalysis. More info is at
http://www.emc.ncep.noaa.gov/mmb/rreanl/

It seems like the data are all stored in one of your sister
institutions in Boulder.

Could you please help us to interpret what the data available are?

The data are in Grib/Grads format.   We have invested a lot of effort

in

working
with netCDF and I don't want Jon Goodall or others in our CUAHSI

community

having to tussle with Grib/Grads.   We have another other data formats
already
with GIS, point observations and remote sensing to consider.

Would it be possible to translate these reanalysis data layers into
netCDF format?

David


---------- End Forwarded Message ----------




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Robb Kambic                       Unidata Program Center
Software Engineer III               Univ. Corp for Atmospheric
Research
address@hidden           WWW:
http://www.unidata.ucar.edu/
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