Home > climate, climate models, Research Papers > Wang and Zeng: Development of global hourly 0.5-degree land surface air temperature datasets

Wang and Zeng: Development of global hourly 0.5-degree land surface air temperature datasets

2013 May 7



Figures extracted from a presentation at the AMS 25th Conference on Climate Variability and Change

https://ams.confex.com/ams/93Annual/webprogram/Paper217099.html

Land surface air temperature (SAT) is one of the most important variables in weather and climate studies, and its diurnal cycle and day-to-day variation are also needed for a variety of applications. Global long-term hourly SAT observational data, however, do not exist. While such hourly products could be obtained from global reanalyses, they are strongly affected by model parameterizations and hence are found to be unrealistic in representing the SAT diurnal cycle (even after the monthly mean bias correction).

Global hourly 0.5-degree SAT datasets are developed here based on four reanalysis products [MERRA (1979-2009), ERA-40 (1958-2001), ERA-Interim (1979-2009), and NCEP/NCAR (1948-2009)] and the CRU TS3.10 data for 1948-2009. Our three-step adjustments include the spatial downscaling to 0.5-degree grid cells, the temporal interpolation from 6-hourly (in ERA-40 and NCEP/NCAR) to hourly using the MERRA hourly SAT climatology for each day (and the linear interpolation from 3-hourly in ERA-Interim to hourly), and the mean bias correction in both monthly mean maximum and minimum SAT using the CRU data.

The final products have exactly the same monthly maximum and minimum SAT as the CRU data, and perform well in comparison with in situ hourly measurements over six sites and with a regional daily SAT dataset over Europe. They agree with each other much better than the original reanalyses, and the spurious SAT jumps of reanalyses over some regions are also substantially eliminated. One of the uncertainties in our final products can be quantified by their differences in the true monthly mean (using 24 hourly values) and the monthly averaged diurnal cycle.

Development of global hourly 0.5-degree land surface air temperature datasets
Wang and Zeng
Journal of Climate 2013 ; e-View
doi: http://dx.doi.org/10.1175/JCLI-D-12-00682.1

http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-12-00682.1

  1. p
    2013 May 8 at 1:50 am

    Hi Ron, can you answer the question that I asked in this thread?

    http://rhinohide.wordpress.com/2010/06/26/gsod-to-ghcn-round-2-2/

  2. 2013 May 9 at 7:23 am

    Hi ‘p’.

    I’ll try to carve out some time this weekend to take a look at what I’ve got. But no promises. I’ve got finals next week.

    Sorry about closing down the comments on older posts, but the spam-bots have arrived.

  3. p
    2013 May 9 at 10:53 am

    Thanks Ron,

    I think that this is quite simple: all I need is two scripts in perl:
    formatGhcnGsodMean.pl

    formatGhcnGsodInventory.pl

    I can’t dowload these scripts because of server error:
    [an error occurred while processing this directive]

  4. 2013 May 9 at 10:59 am

    Try right clicking and do a “Save Link As” or “Save Target As”. What is happening is that the web server thinks it should run the script instead of treating it as a static file.

  5. p
    2013 May 9 at 11:02 am

    Ron Broberg :
    Try right clicking and do a “Save Link As” or “Save Target As”. What is happening is that the web server thinks it should run the script instead of treating it as a static file.

    Not working. Curl, wget either.

  6. 2013 May 9 at 12:38 pm

    I can see the files in the directory

    http://rhinohide.org/rhinohide.cx/co2/gsod/scripts/201006/

    I’ll check permissions tonight.
    I’ll also create two new (but renamed) copies of those files
    formatGhcnGsodMean.pl.txt
    formatGhcnGsodInventory.pl.txt

    Those should be available in 12 hours or so…

  7. p
    2013 May 9 at 12:39 pm

    Thanks a lot :)

  8. 2013 May 9 at 6:40 pm

    Weird. Even stripping exec perms and adding a ‘,txt’ suffix was insufficient.

    You will need to fix the first line in each file.

    http://rhinohide.org/rhinohide.cx/co2/gsod/scripts/201006/

    formatGhcnGsodMean.txt
    formatGhcnGsodMean.txt

    No warranties!
    Not suitable for use in nuclear facilities.

    If you care to (no pressure), drop an email at yahoo.com to ronbroberg.
    I’m curious as to what my 3 year old code is up to. :D

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