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GSFC (N 38°59', W 76°50', Alt 87 m )AERONET Algorithm: Version 2
Site Index
Year: 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
Channel (nm): 1020, 870, 670, 500, 440, 380, 340, 500 (not interpolated), 1640
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and months (Month) in the observation periods. (alpha and PW are only displayed for 500nm)
|
Overall Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Month |
|
JAN | 0.016 | 0.010 |
••• | ••• |
••• | ••• | 124 |
7 |
FEB | 0.019 | 0.013 |
••• | ••• |
••• | ••• | 133 |
8 |
MAR | 0.030 | 0.018 |
••• | ••• |
••• | ••• | 144 |
8 |
APR | 0.041 | 0.026 |
••• | ••• |
••• | ••• | 178 |
8 |
MAY | 0.048 | 0.023 |
••• | ••• |
••• | ••• | 167 |
9 |
JUN | 0.039 | 0.023 |
••• | ••• |
••• | ••• | 182 |
8 |
JUL | 0.037 | 0.020 |
••• | ••• |
••• | ••• | 177 |
8 |
AUG | 0.033 | 0.022 |
••• | ••• |
••• | ••• | 179 |
7 |
SEP | 0.027 | 0.017 |
••• | ••• |
••• | ••• | 168 |
9 |
OCT | 0.022 | 0.012 |
••• | ••• |
••• | ••• | 163 |
7 |
NOV | 0.016 | 0.013 |
••• | ••• |
••• | ••• | 154 |
8 |
DEC | 0.015 | 0.012 |
••• | ••• |
••• | ••• | 130 |
9 |
YEAR | 0.029 | 0.011 |
••• | ••• |
••• | ••• | 1899 |
96 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2008 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2008 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | ••• | ••• |
••• | ••• |
••• | ••• | ••• |
••• |
FEB | ••• | ••• |
••• | ••• |
••• | ••• | ••• |
••• |
MAR | ••• | ••• |
••• | ••• |
••• | ••• | ••• |
••• |
APR | 0.061 | 0.036 |
••• | ••• |
••• | ••• | 15 |
376 |
MAY | 0.085 | 0.028 |
••• | ••• |
••• | ••• | 7 |
157 |
JUN | ••• | ••• |
••• | ••• |
••• | ••• | ••• |
••• |
JUL | ••• | ••• |
••• | ••• |
••• | ••• | ••• |
••• |
AUG | 0.016 | 0.000 |
••• | ••• |
••• | ••• | 1 |
54 |
SEP | 0.027 | 0.014 |
••• | ••• |
••• | ••• | 20 |
551 |
OCT | 0.021 | 0.010 |
••• | ••• |
••• | ••• | 23 |
728 |
NOV | 0.025 | 0.036 |
••• | ••• |
••• | ••• | 13 |
293 |
DEC | 0.019 | 0.019 |
••• | ••• |
••• | ••• | 14 |
225 |
YEAR | ••• | ••• |
••• | ••• |
••• | ••• | 93 |
2384 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2009 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2009 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.016 | 0.006 |
••• | ••• |
••• | ••• | 3 |
107 |
FEB | 0.021 | 0.010 |
••• | ••• |
••• | ••• | 22 |
572 |
MAR | 0.034 | 0.024 |
••• | ••• |
••• | ••• | 18 |
522 |
APR | 0.035 | 0.021 |
••• | ••• |
••• | ••• | 18 |
618 |
MAY | 0.036 | 0.016 |
••• | ••• |
••• | ••• | 16 |
492 |
JUN | 0.040 | 0.026 |
••• | ••• |
••• | ••• | 23 |
434 |
JUL | 0.034 | 0.013 |
••• | ••• |
••• | ••• | 25 |
517 |
AUG | 0.039 | 0.020 |
••• | ••• |
••• | ••• | 24 |
496 |
SEP | 0.022 | 0.006 |
••• | ••• |
••• | ••• | 7 |
243 |
OCT | 0.012 | 0.004 |
••• | ••• |
••• | ••• | 2 |
67 |
NOV | 0.019 | 0.007 |
••• | ••• |
••• | ••• | 8 |
227 |
DEC | 0.017 | 0.016 |
••• | ••• |
••• | ••• | 17 |
433 |
YEAR | 0.027 | 0.010 |
••• | ••• |
••• | ••• | 183 |
4728 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2010 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2010 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.020 | 0.011 |
••• | ••• |
••• | ••• | 19 |
373 |
FEB | 0.025 | 0.021 |
••• | ••• |
••• | ••• | 15 |
419 |
MAR | 0.028 | 0.021 |
••• | ••• |
••• | ••• | 16 |
678 |
APR | 0.049 | 0.020 |
••• | ••• |
••• | ••• | 24 |
846 |
MAY | 0.040 | 0.021 |
••• | ••• |
••• | ••• | 20 |
626 |
JUN | 0.040 | 0.021 |
••• | ••• |
••• | ••• | 27 |
655 |
JUL | 0.038 | 0.019 |
••• | ••• |
••• | ••• | 26 |
792 |
AUG | 0.046 | 0.043 |
••• | ••• |
••• | ••• | 23 |
616 |
SEP | 0.027 | 0.013 |
••• | ••• |
••• | ••• | 23 |
893 |
OCT | 0.027 | 0.020 |
••• | ••• |
••• | ••• | 22 |
786 |
NOV | 0.013 | 0.007 |
••• | ••• |
••• | ••• | 22 |
668 |
DEC | 0.015 | 0.007 |
••• | ••• |
••• | ••• | 14 |
338 |
YEAR | 0.031 | 0.012 |
••• | ••• |
••• | ••• | 251 |
7690 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2011 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2011 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.016 | 0.007 |
••• | ••• |
••• | ••• | 14 |
264 |
FEB | 0.024 | 0.020 |
••• | ••• |
••• | ••• | 19 |
471 |
MAR | 0.033 | 0.019 |
••• | ••• |
••• | ••• | 20 |
573 |
APR | 0.047 | 0.037 |
••• | ••• |
••• | ••• | 17 |
420 |
MAY | 0.050 | 0.021 |
••• | ••• |
••• | ••• | 21 |
433 |
JUN | 0.046 | 0.029 |
••• | ••• |
••• | ••• | 26 |
593 |
JUL | 0.035 | 0.016 |
••• | ••• |
••• | ••• | 11 |
303 |
AUG | 0.031 | 0.019 |
••• | ••• |
••• | ••• | 17 |
466 |
SEP | 0.046 | 0.028 |
••• | ••• |
••• | ••• | 9 |
251 |
OCT | 0.022 | 0.010 |
••• | ••• |
••• | ••• | 20 |
563 |
NOV | 0.015 | 0.009 |
••• | ••• |
••• | ••• | 18 |
534 |
DEC | 0.012 | 0.004 |
••• | ••• |
••• | ••• | 17 |
381 |
YEAR | 0.031 | 0.014 |
••• | ••• |
••• | ••• | 209 |
5252 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2012 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2012 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.016 | 0.016 |
••• | ••• |
••• | ••• | 22 |
445 |
FEB | 0.015 | 0.006 |
••• | ••• |
••• | ••• | 20 |
724 |
MAR | 0.044 | 0.022 |
••• | ••• |
••• | ••• | 23 |
769 |
APR | 0.036 | 0.014 |
••• | ••• |
••• | ••• | 24 |
732 |
MAY | 0.050 | 0.024 |
••• | ••• |
••• | ••• | 18 |
572 |
JUN | 0.037 | 0.023 |
••• | ••• |
••• | ••• | 25 |
713 |
JUL | 0.044 | 0.027 |
••• | ••• |
••• | ••• | 24 |
561 |
AUG | 0.041 | 0.022 |
••• | ••• |
••• | ••• | 21 |
467 |
SEP | 0.023 | 0.014 |
••• | ••• |
••• | ••• | 23 |
699 |
OCT | 0.019 | 0.009 |
••• | ••• |
••• | ••• | 11 |
285 |
NOV | 0.015 | 0.006 |
••• | ••• |
••• | ••• | 16 |
436 |
DEC | 0.021 | 0.019 |
••• | ••• |
••• | ••• | 15 |
208 |
YEAR | 0.030 | 0.013 |
••• | ••• |
••• | ••• | 242 |
6611 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2013 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2013 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.015 | 0.008 |
••• | ••• |
••• | ••• | 18 |
408 |
FEB | 0.016 | 0.006 |
••• | ••• |
••• | ••• | 14 |
406 |
MAR | 0.020 | 0.007 |
••• | ••• |
••• | ••• | 17 |
499 |
APR | 0.046 | 0.024 |
••• | ••• |
••• | ••• | 22 |
756 |
MAY | 0.044 | 0.021 |
••• | ••• |
••• | ••• | 20 |
549 |
JUN | 0.032 | 0.013 |
••• | ••• |
••• | ••• | 19 |
584 |
JUL | 0.029 | 0.009 |
••• | ••• |
••• | ••• | 21 |
518 |
AUG | 0.027 | 0.016 |
••• | ••• |
••• | ••• | 19 |
439 |
SEP | 0.025 | 0.023 |
••• | ••• |
••• | ••• | 27 |
837 |
OCT | 0.024 | 0.013 |
••• | ••• |
••• | ••• | 19 |
599 |
NOV | 0.016 | 0.005 |
••• | ••• |
••• | ••• | 20 |
467 |
DEC | 0.020 | 0.006 |
••• | ••• |
••• | ••• | 16 |
293 |
YEAR | 0.026 | 0.010 |
••• | ••• |
••• | ••• | 232 |
6355 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2014 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2014 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.020 | 0.008 |
••• | ••• |
••• | ••• | 17 |
388 |
FEB | 0.020 | 0.008 |
••• | ••• |
••• | ••• | 13 |
444 |
MAR | 0.026 | 0.009 |
••• | ••• |
••• | ••• | 16 |
453 |
APR | 0.040 | 0.029 |
••• | ••• |
••• | ••• | 20 |
533 |
MAY | 0.055 | 0.028 |
••• | ••• |
••• | ••• | 24 |
546 |
JUN | 0.046 | 0.023 |
••• | ••• |
••• | ••• | 24 |
764 |
JUL | 0.046 | 0.032 |
••• | ••• |
••• | ••• | 22 |
641 |
AUG | 0.032 | 0.015 |
••• | ••• |
••• | ••• | 22 |
643 |
SEP | 0.024 | 0.017 |
••• | ••• |
••• | ••• | 22 |
521 |
OCT | 0.020 | 0.008 |
••• | ••• |
••• | ••• | 21 |
513 |
NOV | 0.016 | 0.007 |
••• | ••• |
••• | ••• | 19 |
411 |
DEC | 0.013 | 0.012 |
••• | ••• |
••• | ••• | 14 |
253 |
YEAR | 0.030 | 0.014 |
••• | ••• |
••• | ••• | 234 |
6110 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2015 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2015 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.011 | 0.004 |
••• | ••• |
••• | ••• | 13 |
352 |
FEB | 0.015 | 0.004 |
••• | ••• |
••• | ••• | 15 |
422 |
MAR | 0.022 | 0.010 |
••• | ••• |
••• | ••• | 17 |
431 |
APR | 0.031 | 0.023 |
••• | ••• |
••• | ••• | 18 |
586 |
MAY | 0.048 | 0.019 |
••• | ••• |
••• | ••• | 25 |
559 |
JUN | 0.042 | 0.027 |
••• | ••• |
••• | ••• | 17 |
341 |
JUL | 0.033 | 0.015 |
••• | ••• |
••• | ••• | 23 |
585 |
AUG | 0.024 | 0.008 |
••• | ••• |
••• | ••• | 24 |
700 |
SEP | 0.030 | 0.019 |
••• | ••• |
••• | ••• | 18 |
603 |
OCT | 0.019 | 0.010 |
••• | ••• |
••• | ••• | 21 |
647 |
NOV | 0.014 | 0.012 |
••• | ••• |
••• | ••• | 16 |
503 |
DEC | 0.010 | 0.003 |
••• | ••• |
••• | ••• | 11 |
292 |
YEAR | 0.025 | 0.012 |
••• | ••• |
••• | ••• | 218 |
6021 |
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GSFC (N 38°59', W 76°50', Alt 87 m )Year: 2016 Top | Site Index
Aerosol optical depth at 1640 nm (taua1640)
the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs). (alpha and PW are only displayed for 500nm)
|
2016 Averages of |
taua1640 | sigma |
alpha440-870 | sigma |
PW | sigma |
N | Obs |
|
JAN | 0.010 | 0.005 |
••• | ••• |
••• | ••• | 18 |
492 |
FEB | 0.013 | 0.007 |
••• | ••• |
••• | ••• | 15 |
387 |
MAR | 0.023 | 0.013 |
••• | ••• |
••• | ••• | 17 |
512 |
APR | 0.027 | 0.013 |
••• | ••• |
••• | ••• | 20 |
780 |
MAY | 0.042 | 0.017 |
••• | ••• |
••• | ••• | 16 |
346 |
JUN | 0.028 | 0.011 |
••• | ••• |
••• | ••• | 21 |
767 |
JUL | 0.035 | 0.014 |
••• | ••• |
••• | ••• | 25 |
594 |
AUG | 0.028 | 0.011 |
••• | ••• |
••• | ••• | 28 |
969 |
SEP | 0.028 | 0.011 |
••• | ••• |
••• | ••• | 19 |
612 |
OCT | 0.022 | 0.012 |
••• | ••• |
••• | ••• | 24 |
720 |
NOV | 0.016 | 0.013 |
••• | ••• |
••• | ••• | 22 |
767 |
DEC | 0.009 | 0.003 |
••• | ••• |
••• | ••• | 12 |
283 |
YEAR | 0.024 | 0.010 |
••• | ••• |
••• | ••• | 237 |
7229 |
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