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Effect of Solar Irradiance Fluctuations on S-NPP Reflective Band CalibrationY. Savranskayaa, J. Wickera, E. Haasa, J. Cardemaa, and F. De Lucciaa
aThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 900245
SSI VIRGO Blue SSI VIRGO Green SSI VIRGO Red TSI ACRIM3
SSI VIRGO Blue (402nm) 1 0.9037 0.8544 0.7067
SSI VIRGO Green (500nm) 0.9037 1 0.9204 0.7457
SSI VIRGO Red (862nm) 0.8544 0.9204 1 0.7199
TSI ACRIM3 0.7067 0.7472 0.7199 1
I. Total Solar Irradiance (TSI) Fluctuations• Long term (~11 years)• Short Term (days/weeks)•Multiple data sources (from SORCE, VIRGO and ACRIM3) show good agreement
-2850 -2800 -2750 -2700 -2650 -2600 -2550 -2500 -2450-3
-2
-1
0
1
2
3x 10
-3
Time (days since 1 Jan 2013)
Rela
tive V
ariation in S
SI
SORCE blue-1.00985
SORCE green-1
SORCE red-1.0015
VIRGO blue-1.00985
VIRGO green-1
VIRGO red-1.0015
II. Fluctuations in VIIRS F-Factor•VIIRS F-Factor is a radiometric
calibration coefficient• Frequency-domain analysis
revealed similar frequency content for TSI and F-Factor fluctuations
IV. Correlation of TSI and SSI with F-Factor Fluctuations• TSI data generally correlates with F-Factor better than does SSI data•Correlation is best at short wavelengths• Time-domain plots below show strong local correlation (6-wk sliding window) for TSI data (around 0.8 or greater)
III. Solar Spectral Irradiance (SSI) Fluctuations• Two sources of SSI data considered: SORCE SIM
and VIRGO SPM (used here)•Plot below shows region of good agreement for
VIRGO SPM’s three (blue,green,red) spectral bands• Table below shows good correlation between SSI
components and TSI data over region of interest
V. Summary•Based on strong correlation of observed F-Factor fluctuations with solar irradiance fluctuations
(especially for shorter wavelength VIIRS bands), solar variability is a significant source of radiometric fluctuations• SSI data does not show significantly better correlation with F-Factor than TSI data does
EXTENTED ABSTRACT REFERENCES
1. Cardema, J. C., Rausch, K. W., Lei, N., Moyer, D. I., and De Luccia, F. J., “Operational Calibration of VIIRS Reflective Solar Band Sensor Data Records,” Proc. SPIE 8510 (2012).
2. Haas, E., Moyer, D., De Luccia, F., Rausch, K., and Fullbright, J., “VIIRS Solar Diffuser Bidirectional Reflectance Distribution Function (BRDF) degradation factor operational
trending and update,” Proc. SPIE 8510 (2012).
3. Ermolli, I., Mathess, K., Dudok de Wit, T., Krivova, N. A., Tourpali, K., Weber, M., Unruh, Y.C., Gray, L., Langematz, U., Pilewskie, P., Rozanov, E., Schmutz, W., Shapiero, A.,
Solanki, S. K., and Woods, T. N., “Recent variability of the solar spectral irradiance and its impact on climate modeling,” Atmos. Chem. Phys., vol. 13, pp. 3945-3977, 2013.
4. Frohlich, C., and Wehrli, C., “Variability of Spectral Solar Irradiance from VIRGO/SPM Observations,” Physikalish-Meteoroligisches Observatorium Davos, World Radiation
Center internal report, 2002.
0 0.2 0.4 0.6 0.8 1 1.20
0.05
0.1
0.15
0.2
Frequency (cyc/day)
Magnitude o
f T
SI_
SO
RC
E F
FT
norm
aliz
ed b
y n
um
ber
of sam
ple
s
0 0.2 0.4 0.6 0.8 1 1.20
0.2
0.4
0.6
0.8
1
1.2
1.4x 10
-4
Frequency (cyc/day)
Magnitude o
f M
4 F
Facto
r F
FT
norm
aliz
ed b
y n
um
ber
of sam
ple
s
-40 -20 0 20 40 601360.5
1361
1361.5
1362
Time (days since 1 Jan 2013)
Irra
dia
nce (
W/m
^2)
TSI_VIRGO(-4.1)
TSI_ACRIM3
TSI_SORCE
-8000 -6000 -4000 -2000 0 20001357
1358
1359
1360
1361
1362
1363
1364
Time (days since 1 Jan 2013)
Irra
dia
nce (
W/m
^2)
TSI_VIRGO(-4.1)
TSI_ACRIM3
TSI_SORCE
300 500 700 1000 2000 30000.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Wavelength (nm)
Corr
ela
tion(
Sola
r D
ata
, V
IIR
S
F F
acto
r)
M1 M2 M3 M4I1
M5 M6 M7I2
M8 M9 M10I3
M11
VIIRSBands {
VIRGO_blue
VIRGO_green
VIRGO_red
TSI_ACRIM3
VIIRS bands
-240 -210 -180 -150 -120 -90 -60 -30 0 30 60 900
0.2
0.4
0.6
0.8
1
Time (days since 1 Jan 2013)
Local C
orr
ela
tion C
oeffic
ient
Correlation(VIRGO_blue,FM1
)
Correlation(VIRGO_green,FM3
)
Correlation(VIRGO_red,FM7
)
Correlation(TSI_ACRIM3,FM4
)
-0.1
0
0.1
0.2
0.3
% F
luctu
ation
-240 -210 -180 -150 -120 -90 -60 -30 0 30 60 90-0.2
0
0.2
0.4
0.6
0.8
1
Time (days since 1 Jan 2013)
Local C
orr
ela
tion C
oeffic
ient
Correlation(TSI_ACRIM3,FM4
)
FM4
FTSI_ACRIM3
SENSOR/MISSION ACRONYMS
SORCE: Solar Radiation and Climate Experiment
SORCE SIM: SORCE Spectral Irradiance Monitor
VIRGO: Variability of Solar Irradiance and Gravity Oscillations (part of SOHO: Solar and Heliospheric Observatory)
VIRGO SPM: VIRGO 3-channel Sun Photometer
ACRIM3: Active Cavity Radiometer Irradiance Monitor 3 instrument