Notes, Questions and Discussion

Submitted by esrl_admin on Wed, 07/20/2016 - 10:04

Users have requested workspaces and comment areas for general reanalysis questions and for asking specific questions or posting comments about specific reanalysis datasets.

The links below are good places to post notes, ask questions, comment, or start a discussion about each dataset.

Or, leave a comment at the bottom of this page. 

Links to Notes, Questions, and Discussions for each reanalysis dataset:

Reanalyses.org Overview Comparison Table
 

Reanalyses.org Overview of each reanalysis
 

SPARC-Reanalysis Intercomparison Project (S-RIP) Comparison Paper and its Tables 

  • the paper includes several tables comparing assimilating models, resolution, major physical parameterizations, data input, and boundary conditions

Richard Yablonsky (not verified)

Fri, 05/12/2017 - 12:23

Hello... we are attempting to simulate the coastal flooding in Great Britain from the 1953 North Sea flood, and we are having trouble finding an atmospheric reanalysis product that provides reasonably accurate surface wind and pressure forcing for our simulations.  Our time period of interest is January 30, 1953 to February 2, 1953.  Any advice on which reanalysis product(s) would be most appropriate for our purposes would be much appreciated.

Dear Richard,

Which datasets have you already tried in this context? 

There are only 5 possibilities: 

20CR v2

20CR v2c

ERA-20C

CERA-20C

NCEP-NCAR 

Links to all of these are available at http://reanalyses.org/atmosphere/overview-current-atmospheric-reanalyses. 

For the ensemble-based 20CR v2 and v2c, you should use individual members, though using the ensemble mean for 1953 Great Britain should be alright.  CERA-20C also has an ensemble, and individual members would probably be better for your purposes. 

best wishes,

gil

20CR2c has a decent qualitative representation of the storm - https://vimeo.com/165142838 - I've not looked at the quantitative accuracy. I think David Hein, at the Met Office has has a regional model run covering the UK downscaled from one of the 20CR ensemble members. That might also be worth a look. 

Cathy.Smith@noaa.gov

Fri, 04/07/2017 - 09:57

The WRIT page is a good start.

For specific countries, The World Bank has data by country but not to 2015. You might contact them and see if they have it available.

http://data.worldbank.org/data-catalog/cckp_historical_data

They use CRU data.

You could also look at the URL below  (they have different years/months available). NCEI has many datasets and could have it lesehwre. You can look/ask them.

https://www.ncdc.noaa.gov/sotc/global/201513


good luck!

Cathy

Tracy Carty (not verified)

Thu, 04/06/2017 - 08:26

Hi

I work for a leading development NGO.  I'm writing a paper on the East Africa drought and I'm trying to get the following information, or close to it based on what's available.  I'm not up to speed with the data sets or how to use them and hence this message is a call to see if anyone would be able to lend me a hand.  I'm hoping this is a quick job for someone who has the data to hand and knows what they are doing??

[Mean annual temperatures increased from 1960-2016 by X in Kenya, X in Ethiopia and X in Somalia][would also be interested for 2015 and first few months of 2017 if available]

FYI - I've also emailed merra-questions@lists.nasa.gov to see if anyone can help with this.

Best wishes,

Tracy

 

Dear Tracy,

If you go to the Web-based reanalysis intercomparison tools https://reanalyses.org/atmosphere/writ and select the WRIT Timeseries button, you can make these calculations yourself for regions that encompass your countries of interest. The JRA-55 Screen dataset is probably the best for your purposes, as it includes actual near-surface thermometer values and is fairly up to date. The JRA-55 itself does not directly include the near surface temperature observations (it does include the upper-air, which start near the surface). 

Enter your latitude and longitude box approximating each country and you will get a time series that includes statistics about how much the temperature has changed.

You can also use the WRIT Maps and zoom in on Africa, and show the difference between the current period and an earlier period.

Hope that this is helpful.

Best wishes,

gil

 

Ashwin (not verified)

Thu, 09/01/2016 - 02:31

Does anyone have any code samples that are newer than this one - http://www.esrl.noaa.gov/psd/data/gridded/readgeneral.F ?

 

I want to be able to read a reanalysis 2 file using fortran and netcdf .

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