| Preliminary Comparison of ECMWF ERA-Interim and ERA-5 Reanalyses | ||
|---|---|---|
| Based on Core-Climax Workshop, Brussels, January 15-16, 2015, and "ECMWF – Computing and Forecast System", iCAS 2015, Annecy, France, September 2015 (Isabella Weger) | ||
| Category | ERA-Interim | ERA-5 |
| Start of Production | August 2006 IFS1 Cy31r2 | June 2015 IFS1 Cy41r1 |
| Model Input | As in operations (inconsistent SST) | Appropriate for Climate (CMIP52, HadISST.23) |
| Model Horizontal Grid | Reduced Gaussian and spectral coefficients | Reduced Gaussian and spectral coefficients |
| Model Horizontal Resolution | Nominally 79 km global (0.703125°) ECMWF T255 N128 (∼512 x 256) | Nominally 31 km global (0.140625°) ECMWF T1279 N640 (∼2560 x 1280) |
| Model Vertical Resolution | 60 levels to 10 Pa (hybrid coordinate) | 137 levels to 1 Pa (hybrid coordinate) |
| Time Period | 1979 to present time | 1979 to present time Possible extension back to ∼1950 |
| Dissemination | Monthly (up to 3 month lag at NCAR) | Monthly (up to 3 month lag at NCAR) Daily for ERA-5T |
| Observations | Primarily ERA-40, GTS4 | Various reprocessed CDR5s |
| Radiative Transfer | RTTOV67 | RTTOV611 |
| Analysis Method | 4D-Var7 1D + 4D-Var for rain | 10-member ensemble 4D-VAR (EDA8) All-sky microwave |
| Variational Bias Correction | Satellite radiances | Satellite radiances, ozone, aircraft, surface pressure, radiosondes |
| Maximum Volume | 50 TB | 1.5 PB |
| 1IFS, Integrated Forecast System 2CMIP5, Coupled Model Intercomparison Project Phase 5 3HadISST.2, Hadley Centre Sea Ice and Sea Surface Temperature data set version 2 4GTS, Global Telecommunication System 5CDR, Climate Data Record 6RTTOV, Radiative Transfer for TOVS, TOVS being TIROS Operational Vertical Sounder (originally hosting the Microvave Sounding Unit – MSU, the High Resolution Infrared Radiation Sounder – HIRS, and the Stratospheric Sounding Unit – SSU) 74D-Var, 4-Dimensional Variational Data Assimilation 8EDA, Ensemble Data Assimilation | ||
28 January 2016
ERA5 compared to ERA-Interim
The RDA anticipates downloading and processing a significant portion of ECMWF ERA5 beginning calendar year 2016. In response to user inquiries about the characteristics of ERA5, the following basic information from various sources has been tabulated:
22 January 2016
The data starts here 2
Professor Catherine D'Ignazio asked What would feminist data visualization look like? I've never thought about data visualization and feminism together before, but her essay over at the MIT Center for Civic Media is well worth a read. So are all the essays from the recent Responsible Data Forum's event about Data Visualization.
Her concept of feminist data visualization is just plain sound data visualization (dataviz).
Her concept of feminist data visualization is just plain sound data visualization (dataviz).
- Invent new ways to represent uncertainty, outsides, missing data, and flawed methods
- Invent new ways to reference the material economy behind the data.
- Make dissent possible
20 January 2016
ds735.0 NCEP GDAS Satellite Data Extended
New and improved, with more satellites!
A chance encounter with members of the WRF Data Assimilation (WRFDA) team led me down a rabbit hole to improve the usefulness of ds735.0 for users of WRFDA.
In 2009, RDA began archiving satellite data products that were ingested into GDAS. (We backfilled the data to 2004 or 2005.) Since then, the number and types of satellite data products ingested into GDAS has grown. It was time for ds735.0 to keep up.
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| Visualization of DMSP F17 WV courtesy of REMSS. |
In 2009, RDA began archiving satellite data products that were ingested into GDAS. (We backfilled the data to 2004 or 2005.) Since then, the number and types of satellite data products ingested into GDAS has grown. It was time for ds735.0 to keep up.
15 January 2016
WRF-able data sets
RDA data specialists has been working with wrfhelp to help Weather Research and Forecasting Model (WRF) users more easily get set up and running with RDA-supplied data sets.
Gridded data in GRIB format is used in the WRF Preprocessing System (WPS) to create both initial conditions inside the WRF domains and lateral boundary conditions outside of them. In order to read in the GRIB data and write it out into a WRF input file, users need to supply a Vtable--a Rosetta stone of sorts that tells WPS which variables to pull-out from the GRIB file.
Gridded data in GRIB format is used in the WRF Preprocessing System (WPS) to create both initial conditions inside the WRF domains and lateral boundary conditions outside of them. In order to read in the GRIB data and write it out into a WRF input file, users need to supply a Vtable--a Rosetta stone of sorts that tells WPS which variables to pull-out from the GRIB file.
04 January 2016
AGU Poster Session Basics
I enjoyed meeting many RDA data users at the 2015 American Geophysical Union Fall Meeting, including two graduate students from IIT Delhi.
The AGU Fall Meeting is always a bit of a homecoming for me as I catch up with colleagues and school friends. (I attended both high school and college within 20 miles of Moscone Center so it is literally a homecoming as well.)
With over 24,000 attendees over the five days of the meeting, it is not logistically possible to give everyone an oral presentation slot. Moreover, many find condensing their work into a 12-minute talk difficult.
Most attendees will be offered a spot in a poster session, which allows ample time for face-to-face (f2f) discussion. Many find the f2f discussion so helpful, they present their work twice in oral AND poster sessions. I've often seen professors give oral talks and refer the audience to the poster(s) of the graduate student(s) for more details about the work in the talk.
If you haven't attended an AGU before, the AGU Poster Presenter Guidelines are a good place to start. But, they don't adequately give you a feel for what these sessions are like.
The AGU Fall Meeting is always a bit of a homecoming for me as I catch up with colleagues and school friends. (I attended both high school and college within 20 miles of Moscone Center so it is literally a homecoming as well.)
With over 24,000 attendees over the five days of the meeting, it is not logistically possible to give everyone an oral presentation slot. Moreover, many find condensing their work into a 12-minute talk difficult.
Most attendees will be offered a spot in a poster session, which allows ample time for face-to-face (f2f) discussion. Many find the f2f discussion so helpful, they present their work twice in oral AND poster sessions. I've often seen professors give oral talks and refer the audience to the poster(s) of the graduate student(s) for more details about the work in the talk.
If you haven't attended an AGU before, the AGU Poster Presenter Guidelines are a good place to start. But, they don't adequately give you a feel for what these sessions are like.
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