6 Decades of Shortwave Radiation

Scientists developed a very high resolution dataset that goes back 6 decades: TerraClimate (Nature link). I will/may be examining their data (with model stuffing) in the next few posts.

The first thing I downloaded was the srad dataset, all 8.4GB of it, from 1958 to 2021.

srad means Shortwave Radiation (to Surface).

Solar Downwelling Radiation – July 2021

I was a little disappointed that it only covers land. No oceans. But let’s see what we can get out of it anyway …

These numbers suggest this is solar downwelling, not Net Solar (minus solar upwelling). Also dissapointed, but will do.

If this data with model filling is true, the ~3 W/m2 difference (~179 minus ~176) over 6 decades is WAY more than could even be hypothesized by carbon dioxide warming over the last 2 centuries.

Again we see that the solar shortwave is the dominant force in all the global warming we observed.

Sorry, times up.

Best regards, -Z

P.S. No, I have no idea what happened there in the early 1970s.

Code

# Zoe Phin, 2022/06/11
# File: srad.sh
# Run: source srad.sh; require; download; extract; plot

require() { sudo apt-get install -y gmt nco gnuplot python3-xarray python3-netcdf4; }
download() {
    for y in {1958..2021}; do
        wget -O $y.nc "http://thredds.northwestknowledge.net:8080/thredds/fileServer/TERRACLIMATE_ALL/data/TerraClimate_srad_$y.nc"
    done
}
extract() { echo "import xarray as x; import numpy as n
    a=6378.137; e=1-6356.752**2/a**2; r=n.pi/180
    d = x.open_dataset('1958.nc')['srad']
    by_lat=(a*r/24)**2*(1-e)*n.cos(r*d.lat)/(1-e*n.sin(r*d.lat)**2)**2/59035.372
    for y in range(1958,1960):
        for m in x.open_dataset(str(y)+'.nc')['srad'].weighted(by_lat).mean({'lon','lat'}).values:
            print(y,m)" | sed 's/\t//1' | python3 -u | tee .srad
}
parse() { awk '{ printf "%.3f %.6f\n", 1958+NR/12-1/24,$2 }' .srad; }
annual() { awk '{S[substr($0,1,4)]+=$2/12} END {for (y in S) printf "%d %.6f\n",y,S[y]}'; }
plot() { 
    parse > srad.mon
    parse | annual > srad.ann
    parse | yoy 12 > srad.yoy
    paste -d ' ' srad.mon srad.yoy > srad.csv
    echo "set term png size 740,740
        set key outside top center horizontal
        set grid xtics ytics
        set xrange [1958:2021]
        set format y '%.1f'
        plot 'srad.csv' u 1:3 t 'Shortwave Radiation to Surface (W/m²) - 12mo CMA' w l lw 2 lc rgb 'orange'
    "| gnuplot > srad.png 
}
yoy() { awk '{printf "%s ",$2}' | awk -vp=$1 '{ h=p/2;
    for (i=0;i<h;i++) print ""
    for (i=h;i<=NF-h;i++) { s=0
        for (j=i-h+1;j<=i+h;j++) s+=$j/p
            printf "%8.6f\n", s
    } }'
}

Published by Zoe Phin

https://phzoe.com

11 thoughts on “6 Decades of Shortwave Radiation

  1. Too many posts in a row.
    Can’t keep up.
    I’m exhausted.
    Slow down.
    ha ha
    R. Greene
    Professional Complainers
    of America

    Like

      1. That was intended to be a joke
        about your sudden burst of publishing.
        I assumed it would be deleted.
        I recommended your blog
        on one of my blogs today,
        where there have been 252
        page views as of 3:15 pm.
        I don’t expect a thank you,
        but “spam” was unfriendly.

        Richard Greene
        EconomicLogic@Yahoo.com

        Like

  2. Interesting to see that the record warm year of 1998 was a year of rather low srad to surface. The El Niño effect sure must be strong….

    Liked by 1 person

  3. Also interesting to see that El Chichon in 1982 and Pinatubo in 1991 doesn’t seem to have affected the srad that much as the srad was already low in advance…

    Like

    1. JRA-55 also seems to contradict CERES over the last 20 years.

      Clue: TerraClimate is LAND only.

      P.S. I wouldn’t be surprised if fluxes have also gotten politicized!

      Like

  4. It would be interesting to compare your data with those in this study…too much of a headache for me 🙂

    [ Edit: _https://www.arm.gov/publications/other/P012745.pdf ]

    Like

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