Campbell-scientific CNR4 Net Radiometer Manuel d'utilisateur télécharger pdf (Page 45)

Appendix A. CNR4 Performance and Measurements under Different Conditions

upwellingsignal(downwardfacing)pyrgeometer

‐30

‐20

‐10

0:00:00

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:00

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Pyrgeometer:U‐emf/sensitivity[W/m²] Tempofinstrument[°C]

Upwelling Signal (Downward Facing) Pyrgeometer

FI rd facing pyrgeometer

ume at when am ent temperature varies, t t far i ared

ation roug me, in t of ambient temperature. The

lting d val yrg and p ome sho

mns 4 TABL hese cative res only, they depend

rongly on r circumstances; the pyr eter results, of course, change

the sen tempera is is in l 8. Du the da

he Pt-100 r ing may o sola g, up degr ove

bient tem rature. D e night or t atur be low

the am pe e to fa d radi oli e lat

ffects d not influence nd res e calcul ions of T and

und T. Therefore, t ot take coun e ta colu

might e to see “0 –50” for all sitions t showing “0”; i

lumn 5, th ” values m reality b -20 to +2 The r g sky

emperature indicated in lumn 9. Un cloudy ition sky

erature equal to a t temperatu . Under clear con , the s

erature lower than mbient tem rature.

The ground temperature, in column 10, is assumed to be equal to the ambient

temperature. In practice, it may be higher during the day, due to solar heating.

values of the sensors using formulas A-1 and A-2

GURE A-3. Clear day for the downwa

It is ass d th bi he ne nfr

radi

resu

colu

remains

measure

to 7 in

othe

hly the sa

ues of the p

E A-1. T

dependen

eometers

are indi

geom

yran

figu

ters are wn in

with sor ture. Th dicated in co umn ring y,

ead

rise due t

uring th

r heatin

, the sens

to 10

emper

ees ab

e may er

than

two e

bient tem

rature du

the e

r infrare

ult of th

ative co

ng. Th

sky

ter

gro hey are n n into ac t in th ble. In mn 4,

one

xpect

e “0

ay in

e “

hat are

0”.

esultin

t is co der cond s, this

temp

mbien

the a

ditions ky

Ground temperature may be lower than ambient during the night, due to far

infrared radiative cooling. The sky and the ground temperature can be

calculated from the measured

below.

A-3

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 63 64

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Campbell-scientific CNR4 Net Radiometer Manuel d'utilisateur Page 45

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