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Interpolation of temperature at 2m is affected by the changes to:

the land sea-mask processing
the default interpolation method
the distance computation and selection of nearest points

HRES - O1280

Temperature at 2m has been interpolated from the O1280 octahedral reduced Gaussian grid to regular lat-lon grids at different target resolutions using EMOSLIB and MIR.

For the cases shown here, differences between MIR and EMOSLIB generally lie between +/-5K.
In general, more than 99.55% of points differ by less than +/-0.5 K.
The largest differences occur close to the coasts and in areas of steep orography where the gradient of the 2m temperature field changes most rapidly

The plots show the differences with the contours chosen on a logarithmic scale to enhance the smaller differences. Differences smaller than 0.1% of the field range are not shown. Grid points where the absolute difference is greater than 25% of the maximum absolute difference are indicated with red (EMOSLIB greater than MIR) and blue (EMOSLIB less than MIR) filled circles.

Target resolution	Statistics of differences	Histogram of differences	Global	Europe

N.AmericaS.AmericaAfricaIndiaEast AsiaAustralasia


0.1x0.1	Maximum difference = 4.757812 Minimum difference = -4.185547

Average difference = -0.000148

Mean absolute difference =

-

0.

000148

011020
Median absolute difference = 0.

000000

001953
Standard deviation = 0.054195

Variance

RMS of differences = 0.

002937

054195

RMS of differences = 0.054195

Percentage of points with absolute difference

       < 0.5 = 99.771%
        < 1.0 = 99.955%
        < 2.0 = 99.996%

-5.5 : -4.5 -          0 ( 0.000000%)
-4.5 : -3.5 -          4 ( 0.000062%)
-3.5 : -2.5 -         44 ( 0.000679%)
-2.5 : -1.5 -        322 ( 0.004966%)
-1.5 : -0.5 -       7168 ( 0.110556%)
-0.5 : 0.5 -    6468824 ( 99.772102%)
0.5 : 1.5 -       6847 ( 0.105605%)
1.5 : 2.5 -        354 ( 0.005460%)
2.5 : 3.5 -         31 ( 0.000478%)
3.5 : 4.5 -          4 ( 0.000062%)
4.5 : 5.5 -          2 ( 0.000031%)

Image Added

    -4.757812 : -3.806250 -              2 (0.000031%)
    -3.806250 : -2.854687 -             19 (0.000293%)
    -2.854687 : -1.903125 -            140 (0.002159%)
    -1.903125 : -0.951563 -           1528 ( 0.023567%)
    -0.951563 : 0.000000 -        1943245 (29.971698%)
    0.000000 : 0.951562 -        4537029 (69.977004%)
    0.951562 : 1.903125 -           1473 (0.022719%)
    1.903125 : 2.854687 -            148 (0.002283%)
    2.854687 : 3.806250 -             13 (0.000201%)
    3.806250 : 4.757812 -              3 (0.000046%)

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0.125x0.125	Maximum difference = 5.131653 Minimum difference = -3.907410

Average difference = -0.000150

Mean absolute difference =

-

0.

000150

011335
Median absolute difference = 0.

000793

001160
Standard deviation = 0.054557

Variance

RMS of differences = 0.

002976

054557

RMS of differences = 0.054557

Percentage of points with absolute difference

       < 0.5 = 99.772%
        < 1.0 = 99.954%
        < 2.0 = 99.996%

-6.5 : -5.5 - 0 ( 0.000000%)
-5.5

-5.131653

: -4.

105322

5 -

0 ( 0.000000%)
-4.

105322

5 : -3.

078992 - 6

5 - 3 ( 0.

000145%

000072%)
-3.

078992

5 : -2.

052661 - 66

5 - 25 ( 0.

001590%

000602%)
-2.

052661

5 : -1.

026331 - 811

5 - 230 ( 0.

019542%

005542%)

-1.

026331

5 : -0.

000000 -        1904768 ( 45.897139%)
0.000000 : 1.026331 -        2243534 ( 54.060018%)
1.026331 : 2.052661 -            823 ( 0.019831%)
2.052661 : 3.078992 -             67 ( 0.001614%)
3.078992 : 4.105322 -              4 ( 0.000096%)
4.105322 : 5.131653 -              1 ( 0.000024%)

5 - 4543 ( 0.109468%) -0.5 : 0.5 - 4140621 ( 99.772077%) 0.5 : 1.5 - 4386 ( 0.105685%) 1.5 : 2.5 - 249 ( 0.006000%) 2.5 : 3.5 - 20 ( 0.000482%) 3.5 : 4.5 - 2 ( 0.000048%) 4.5 : 5.5 - 1 ( 0.000024%) 5.5 : 6.5 - 0 ( 0.000000%)	Image Added	Image Added
0.25x0.25	Maximum difference = 3.029404 Minimum difference = -3.908096

Average difference = -0.000183

Mean absolute difference =

-

0.

000183

011457
Median absolute difference = 0.

000107

001846
Standard deviation = 0.057023

Variance

RMS of differences = 0.

003252

057023

RMS of differences = 0.057023

Percentage of points with absolute difference

       < 0.5 = 99.743%
        < 1.0 = 99.946%
        < 2.0 = 99.996%

-4.5

-3.908096

: -3.

126477

5 -

1 ( 0.000096%)
-3.

126477

5 : -2.

344858

5 -

11

7 ( 0.

001059%

000674%)
-2.

344858

5 : -1.

563239 - 44

5 - 60 ( 0.

004238%

005779%)
-1.

563239

5 : -0.

781619 - 481

5 - 1293 ( 0.

046328%

124538%)
-0.

781619

5 : 0.

000000 -         327788 ( 31.571506%)
0.000000 : 0.781619 -         709392 ( 68.326399%)
0.781619 : 1.563239 -            455

5 - 1035573 ( 99.743123%)
0.5 : 1.5 - 1224 ( 0.

043824%

117892%)
1.

563239

5 : 2.

344858 - 61

5 - 79 ( 0.

005875%

007609%)

2.

344858

5 : 3.

126477 - 7

5 - 3 ( 0.

000674%

000289%)

3.

126477

5 :

3

4.

908096

5 -

0 ( 0.000000%)

Image Added

0.5x0.5

Maximum difference = 4.168945
Minimum difference = -3.477539

Average difference = -0.000101

Mean absolute difference =

-

0.

000101

013174
Median absolute difference =

-

0.000977
Standard deviation = 0.066953

Variance

RMS of differences = 0.

004483

066953

RMS of differences = 0.066953

Percentage of points with absolute difference

       < 0.5 = 99.645%
        < 1.0 = 99.920%
        < 2.0 = 99.990%

-5.5 : -4.5 - 0

-4.168945 : -3.335156 - 1

( 0.

000385%

000000%)
-

3

4.

335156

5 : -

2

3.

501367 - 3

5 - 0 ( 0.

001154%

000000%)

2

-3.

501367

5 : -

1

2.

667578

5 -

17

4 ( 0.

006540%

001539%)
-

1

2.

667578

5 : -

0

1.

833789

5 -

149

23 ( 0.

057325%

008849%)
-

0

1.

833789

5 : -0.

000000 - 130503 ( 50.208910%)
0.000000

5 - 434 ( 0.166974%)
-0.5 : 0.

833789 - 129088 ( 49.664512%)
0.833789

5 - 258998 ( 99.645275%)
0.5 : 1.

667578 - 138

5 - 433 ( 0.

053093%

166590%)
1.

667578

5 : 2.

501367 - 18

5 - 25 ( 0.

006925%

009618%)

2.

501367

5 : 3.

335156

5 -

2 ( 0.000769%)
3.

335156

5 : 4.

168945

5 -

1 ( 0.000385%) 4.5 : 5.5 - 0 ( 0.000000%)	Image Added	Image Added
1.0x1.0	Maximum difference = 2.676575 Minimum difference = -1.856628

Average difference = -0.000261

Mean absolute difference =

-

0.

000261

013214
Median absolute difference = 0.

000793

001160
Standard deviation = 0.063501

Variance = 0.004032

RMS of differences = 0.063501

Percentage of points with absolute difference

-2.676575 : -2.141260 -              0 ( 0.000000%)
-2.141260 : -1.605945 -              1 ( 0.001535%)
-1.605945 : -1.070630 -             19 ( 0.029159%

< 0.5 = 99.652%
< 1.0 = 99.932%
< 2.0 = 99.994%

-3.5 : -2.5 - 0 ( 0.000000%)
-2.5 : -1.5 - 2 ( 0.003069%)
-1.

070630

5 : -0.

535315 - 84

5 - 116 ( 0.

128913%

178023%)
-0.

535315

5 : 0.

000000 -          29936 ( 45.942296%)
0.000000 : 0.535315 -          35020 ( 53.744629%)
0.535315 : 1.070630 -             80

5 - 64933 ( 99.651627%)
0.5 : 1.5 - 104 ( 0.

122775%

159607%)

1.

070630

5 :

1

2.

605945

5 -

15

4 ( 0.

023020%

006139%)

1

2.

605945

5 :

2

3.

141260

5 -

1 ( 0.001535%)

2.141260 : 2.676575 - 4 ( 0.006139%)

Image Added

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Key

HRES - O1280