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AERONET Climatology, Level 2.0 - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

AERONET Algorithm: Version 2

Site Index

Year: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013

Channel (nm): 1020, 870, 670, 500, 440, 380, 340, 500 (not interpolated), 1640
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and months (Month) in the observation periods.

Overall Averages of taua500sigma alpha440-870sigma PWsigma NMonth

JAN 0.08 0.05 1.51 0.31 0.62 0.38 315 19
FEB 0.10 0.06 1.44 0.34 0.61 0.33 328 20
MAR 0.14 0.09 1.40 0.33 0.86 0.51 377 20
APR 0.18 0.10 1.32 0.31 1.22 0.63 389 20
MAY 0.24 0.16 1.46 0.29 1.85 0.81 386 21
JUN 0.34 0.23 1.69 0.25 2.62 0.85 444 21
JUL 0.40 0.27 1.75 0.26 3.02 0.82 466 21
AUG 0.41 0.27 1.75 0.25 2.95 0.81 447 21
SEP 0.23 0.20 1.71 0.27 2.12 0.80 402 21
OCT 0.13 0.10 1.61 0.34 1.42 0.64 383 21
NOV 0.10 0.07 1.64 0.27 0.99 0.53 350 20
DEC 0.08 0.05 1.62 0.29 0.71 0.42 342 20
YEAR 0.20 0.12 1.57 0.14 1.58 0.91 4629 245

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1993
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1993 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN •••••• •••••• ••••••••• •••
FEB •••••• •••••• ••••••••• •••
MAR •••••• •••••• ••••••••• •••
APR •••••• •••••• ••••••••• •••
MAY 0.22 0.04 1.07 0.01 1.49 0.18 2 59
JUN 0.44 0.34 1.27 0.27 1.96 0.83 12 224
JUL 0.57 0.26 1.45 0.21 2.97 0.44 8 116
AUG 0.27 0.07 1.50 0.30 2.48 0.16 3 47
SEP 0.15 0.05 1.25 0.25 0.95 0.15 4 98
OCT 0.17 0.15 1.06 0.42 1.09 0.50 19 477
NOV 0.15 0.05 1.20 0.26 0.68 0.21 13 220
DEC 0.14 0.07 1.04 0.28 •••••• 12 178
YEAR•••••• •••••• ••••••73 1419

Download_1993




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1994
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1994 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN •••••• •••••• ••••••••• •••
FEB 0.13 0.06 1.04 0.32 •••••• 13 255
MAR 0.22 0.11 1.22 0.24 0.81 0.15 12 176
APR 0.18 0.05 1.09 0.30 •••••• 19 324
MAY 0.18 0.03 1.13 0.37 1.38 0.53 5 56
JUN 0.48 0.25 1.50 0.25 2.80 0.94 15 199
JUL 0.55 0.21 1.69 0.16 3.38 0.82 14 191
AUG 0.58 0.35 1.63 0.12 2.66 0.75 11 147
SEP 0.39 0.35 1.62 0.16 2.19 0.65 19 413
OCT 0.15 0.12 1.41 0.47 1.32 0.51 16 401
NOV 0.08 0.07 1.37 0.30 1.02 0.63 20 365
DEC 0.11 0.10 1.57 0.49 0.84 0.46 15 316
YEAR•••••• •••••• ••••••159 2843

Download_1994




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1995
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1995 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.12 0.06 1.29 0.29 0.79 0.54 11 194
FEB 0.14 0.11 0.95 0.24 0.56 0.28 15 245
MAR 0.22 0.25 1.22 0.54 0.87 0.51 9 172
APR 0.21 0.11 1.45 0.32 1.31 0.61 18 412
MAY 0.20 0.10 1.32 0.34 1.39 0.45 19 435
JUN 0.45 0.24 1.46 0.28 •••••• 15 354
JUL 0.55 0.29 1.69 0.23 3.52 0.91 24 417
AUG 0.39 0.27 1.61 0.37 3.17 0.91 25 595
SEP 0.32 0.22 1.85 0.39 2.38 0.80 22 485
OCT 0.22 0.04 1.71 0.20 1.77 0.40 2 41
NOV 0.09 0.04 1.74 0.13 •••••• 9 196
DEC 0.07 0.02 1.47 0.23 •••••• 16 344
YEAR 0.25 0.15 1.48 0.26 -100.00-100.00 185 3890

Download_1995




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1996
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1996 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.13 0.07 1.54 0.49 •••••• 11 157
FEB 0.08 0.04 1.10 0.33 •••••• 9 191
MAR 0.12 0.10 0.94 0.27 •••••• 16 450
APR 0.21 0.11 1.26 0.39 1.26 0.61 21 474
MAY 0.25 0.13 1.54 0.26 1.67 0.86 16 411
JUN 0.52 0.40 1.67 0.43 2.86 0.91 20 504
JUL 0.54 0.49 1.56 0.56 3.00 1.05 21 328
AUG 0.63 0.37 1.69 0.30 •••••• 26 502
SEP 0.30 0.28 1.75 0.46 •••••• 9 171
OCT 0.16 0.13 1.38 0.41 •••••• 19 429
NOV 0.08 0.03 1.58 0.18 •••••• 14 215
DEC 0.08 0.03 1.61 0.25 •••••• 9 169
YEAR 0.26 0.20 1.47 0.25 -100.00-100.00 191 4001

Download_1996




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1997
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1997 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.03 1.30 0.31 •••••• 7 92
FEB 0.15 0.08 1.22 0.50 •••••• 13 216
MAR 0.11 0.05 1.41 0.27 1.22 0.53 18 393
APR 0.15 0.06 1.17 0.32 0.81 0.44 9 238
MAY 0.17 0.08 1.48 0.40 1.35 0.53 17 432
JUN 0.27 0.18 1.73 0.21 2.38 0.83 19 479
JUL 0.35 0.27 1.70 0.29 2.58 0.66 23 564
AUG 0.37 0.26 1.92 0.23 2.83 0.80 25 346
SEP 0.24 0.28 1.58 0.31 1.86 0.72 16 475
OCT 0.21 0.20 1.83 0.24 1.29 0.72 16 506
NOV 0.10 0.05 1.76 0.22 0.74 0.32 13 496
DEC 0.07 0.02 1.84 0.24 0.60 0.21 16 279
YEAR 0.19 0.10 1.58 0.26 -100.00-100.00 192 4516

Download_1997




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1998
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1998 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.10 0.05 1.66 0.32 0.98 0.45 18 271
FEB 0.11 0.05 1.45 0.40 0.78 0.25 12 218
MAR 0.16 0.09 1.58 0.33 1.09 0.71 18 796
APR 0.17 0.10 1.24 0.24 1.14 0.64 19 450
MAY 0.30 0.15 1.49 0.26 2.07 0.56 18 461
JUN 0.28 0.20 1.75 0.16 2.60 0.90 18 247
JUL 0.49 0.28 1.81 0.19 2.73 0.83 23 424
AUG 0.36 0.20 1.60 0.22 2.82 1.03 23 500
SEP 0.36 0.23 1.78 0.14 2.48 0.82 25 633
OCT 0.10 0.06 1.62 0.18 1.19 0.36 17 457
NOV 0.09 0.07 1.76 0.21 0.95 0.29 14 276
DEC 0.11 0.10 1.74 0.22 1.07 0.86 17 319
YEAR 0.22 0.13 1.62 0.17 1.66 0.81 222 5052

Download_1998




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 1999
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

1999 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.04 1.50 0.34 0.64 0.35 16 303
FEB 0.12 0.07 1.54 0.34 0.61 0.31 14 280
MAR 0.13 0.07 1.35 0.32 0.66 0.25 23 680
APR 0.16 0.13 1.32 0.28 1.10 0.62 21 552
MAY 0.20 0.10 1.45 0.29 1.76 0.62 17 449
JUN 0.28 0.16 1.60 0.27 2.45 0.89 20 308
JUL 0.40 0.28 1.78 0.22 3.14 0.68 24 441
AUG 0.37 0.22 1.87 0.15 2.74 0.47 20 346
SEP 0.18 0.21 1.72 0.27 1.87 0.74 17 447
OCT 0.11 0.06 1.72 0.32 1.35 0.42 25 621
NOV 0.13 0.12 1.61 0.29 1.26 0.75 24 486
DEC 0.08 0.04 1.74 0.21 0.72 0.37 23 645
YEAR 0.19 0.11 1.60 0.17 1.53 0.87 244 5558

Download_1999




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2000
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2000 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.05 1.41 0.37 0.53 0.40 17 293
FEB 0.12 0.07 1.61 0.33 0.72 0.46 17 493
MAR 0.13 0.08 1.74 0.23 1.04 0.50 23 762
APR 0.16 0.09 1.48 0.24 1.22 0.57 16 359
MAY 0.35 0.19 1.61 0.26 2.18 0.94 20 529
JUN 0.39 0.21 1.82 0.25 3.03 0.88 21 446
JUL 0.36 0.23 1.92 0.20 2.77 0.72 21 449
AUG 0.39 0.20 1.81 0.17 2.80 0.89 21 357
SEP 0.18 0.14 1.85 0.26 2.08 1.11 20 566
OCT 0.15 0.12 1.70 0.33 1.43 0.81 23 743
NOV 0.09 0.06 1.75 0.30 0.94 0.48 21 437
DEC 0.08 0.04 1.63 0.33 0.50 0.20 21 493
YEAR 0.21 0.13 1.69 0.15 1.60 0.93 241 5927

Download_2000




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2001
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2001 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.09 0.06 1.61 0.20 0.59 0.27 16 359
FEB 0.12 0.06 1.38 0.34 0.67 0.29 21 431
MAR 0.11 0.04 1.52 0.31 0.59 0.24 19 559
APR 0.23 0.12 1.12 0.40 1.30 0.86 21 565
MAY 0.31 0.27 1.42 0.37 1.49 0.64 22 566
JUN 0.43 0.30 1.77 0.22 2.59 0.74 24 664
JUL 0.22 0.14 1.66 0.27 2.42 0.87 22 556
AUG 0.59 0.30 1.71 0.22 3.05 0.64 24 445
SEP 0.18 0.13 1.61 0.27 1.93 0.62 23 569
OCT 0.12 0.08 1.47 0.42 1.32 0.66 26 1006
NOV 0.14 0.10 1.63 0.23 1.10 0.59 25 810
DEC 0.08 0.04 1.64 0.16 0.82 0.49 22 494
YEAR 0.22 0.16 1.54 0.18 1.49 0.83 265 7024

Download_2001




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2002
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2002 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.07 0.05 1.59 0.26 0.53 0.16 17 445
FEB 0.09 0.06 1.46 0.36 0.55 0.25 21 638
MAR 0.15 0.08 1.42 0.23 0.80 0.49 17 490
APR 0.18 0.09 1.49 0.23 1.45 0.93 24 663
MAY 0.26 0.23 1.43 0.29 1.73 0.92 26 700
JUN 0.44 0.27 1.79 0.19 2.57 0.80 26 707
JUL 0.61 0.43 1.67 0.20 3.18 0.93 23 642
AUG 0.41 0.25 1.81 0.24 3.15 0.88 23 645
SEP 0.24 0.20 1.54 0.27 1.91 0.23 24 782
OCT 0.20 0.12 1.77 0.15 1.69 0.75 14 287
NOV 0.09 0.04 1.75 0.26 0.79 0.20 13 314
DEC 0.07 0.04 1.71 0.26 0.59 0.27 18 371
YEAR 0.23 0.17 1.62 0.15 1.58 0.98 246 6684

Download_2002




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2003
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2003 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.07 0.03 1.50 0.35 0.47 0.26 19 448
FEB 0.09 0.05 1.61 0.37 0.48 0.24 10 285
MAR 0.16 0.09 1.42 0.32 1.01 0.43 19 578
APR 0.23 0.16 1.26 0.27 1.38 0.48 21 643
MAY 0.33 0.16 1.44 0.25 1.83 0.64 12 194
JUN 0.40 0.18 1.78 0.20 2.51 0.84 16 446
JUL 0.37 0.19 1.79 0.28 3.08 0.67 21 415
AUG 0.58 0.26 1.63 0.17 3.40 0.74 20 412
SEP 0.22 0.22 1.78 0.29 2.13 0.82 20 497
OCT 0.12 0.09 1.79 0.27 1.36 0.49 21 524
NOV 0.10 0.06 1.77 0.19 1.17 0.71 20 467
DEC 0.06 0.03 1.64 0.25 0.63 0.18 19 402
YEAR 0.23 0.16 1.62 0.18 1.62 0.99 218 5311

Download_2003




Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2004
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2004 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.07 0.04 1.52 0.32 0.47 0.18 19 397
FEB 0.09 0.06 1.59 0.30 0.54 0.22 20 575
MAR 0.14 0.06 1.52 0.26 0.99 0.63 19 485
APR 0.20 0.11 1.34 0.26 1.32 0.71 19 481
MAY 0.31 0.12 1.49 0.25 2.49 0.80 22 491
JUN 0.32 0.22 1.75 0.21 2.37 0.83 19 437
JUL 0.61 0.34 1.66 0.21 3.11 0.59 21 445
AUG 0.41 0.21 1.76 0.32 3.01 0.82 21 451
SEP 0.18 0.12 1.73 0.26 2.09 0.60 14 404
OCT 0.11 0.07 1.47 0.22 1.38 0.46 19 567
NOV 0.07 0.07 1.63 0.31 1.05 0.53 20 487
DEC 0.09 0.07 1.69 0.39 0.73 0.37 20 499
YEAR 0.22 0.17 1.60 0.13 1.63 0.95 233 5719

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2005
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2005 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.06 1.29 0.38 0.67 0.61 14 315
FEB 0.10 0.05 1.45 0.33 0.67 0.35 20 452
MAR 0.16 0.13 1.62 0.23 0.72 0.34 20 424
APR 0.16 0.11 1.41 0.32 1.04 0.42 20 697
MAY 0.24 0.15 1.60 0.31 1.65 0.62 20 531
JUN 0.34 0.17 1.71 0.23 2.85 0.86 22 559
JUL 0.42 0.18 1.66 0.25 3.39 0.87 22 468
AUG 0.53 0.36 1.68 0.36 3.34 0.70 24 706
SEP 0.24 0.22 1.66 0.22 2.19 0.81 25 875
OCT 0.10 0.06 1.83 0.25 1.33 0.49 16 523
NOV 0.08 0.05 1.77 0.19 1.02 0.60 20 487
DEC 0.09 0.05 1.78 0.16 0.59 0.27 19 384
YEAR 0.21 0.15 1.62 0.16 1.62 1.06 242 6421

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2006
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2006 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.06 1.33 0.35 0.72 0.28 18 377
FEB 0.09 0.04 1.54 0.23 0.56 0.31 17 526
MAR 0.13 0.09 1.37 0.32 0.77 0.49 23 738
APR 0.15 0.08 1.28 0.43 1.12 0.51 23 784
MAY 0.22 0.16 1.56 0.25 1.76 0.81 26 773
JUN 0.31 0.17 1.75 0.23 2.37 0.74 22 603
JUL 0.51 0.24 1.71 0.27 3.27 0.66 24 551
AUG 0.34 0.24 1.69 0.20 2.82 0.95 25 610
SEP 0.28 0.23 1.80 0.22 2.10 0.54 17 476
OCT 0.11 0.08 1.67 0.28 1.39 0.68 24 746
NOV 0.09 0.03 1.71 0.24 1.09 0.56 14 403
DEC 0.10 0.06 1.62 0.15 0.80 0.36 22 444
YEAR 0.20 0.13 1.59 0.17 1.56 0.90 255 7031

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2007
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2007 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.06 0.02 1.46 0.27 0.56 0.31 18 446
FEB 0.08 0.04 1.50 0.25 0.38 0.22 19 652
MAR 0.17 0.13 1.42 0.30 0.99 0.70 24 722
APR 0.18 0.11 1.51 0.25 1.24 0.58 17 438
MAY 0.30 0.21 1.37 0.31 1.98 0.75 27 917
JUN 0.43 0.28 1.59 0.23 2.74 0.87 27 695
JUL 0.37 0.21 1.84 0.25 2.85 0.88 27 667
AUG 0.56 0.28 1.77 0.24 3.13 0.93 24 642
SEP 0.23 0.19 1.75 0.21 2.21 0.85 27 1062
OCT 0.16 0.13 1.60 0.34 1.90 0.93 23 716
NOV 0.12 0.09 1.66 0.31 0.96 0.58 21 383
DEC 0.09 0.05 1.68 0.18 0.71 0.38 14 293
YEAR 0.23 0.16 1.59 0.15 1.64 0.96 268 7633

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2008
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2008 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.09 0.05 1.48 0.30 0.66 0.56 22 474
FEB 0.10 0.06 1.55 0.25 0.66 0.34 17 420
MAR 0.15 0.08 1.49 0.24 0.74 0.30 23 636
APR 0.22 0.11 1.39 0.27 1.35 0.69 16 382
MAY 0.20 0.12 1.40 0.26 1.54 0.57 22 635
JUN 0.30 0.18 1.75 0.21 2.84 0.81 28 709
JUL 0.35 0.18 1.95 0.18 2.89 0.62 24 645
AUG 0.26 0.16 1.90 0.20 2.57 0.55 26 723
SEP 0.18 0.10 1.74 0.27 2.06 0.68 20 556
OCT 0.09 0.04 1.59 0.20 1.27 0.52 24 756
NOV 0.13 0.10 1.68 0.20 0.90 0.56 16 377
DEC 0.08 0.04 1.52 0.30 0.69 0.47 16 265
YEAR 0.18 0.09 1.62 0.18 1.51 0.87 254 6578

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2009
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2009 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.06 1.66 0.20 0.45 0.20 18 497
FEB 0.11 0.05 1.53 0.24 0.60 0.28 22 572
MAR 0.15 0.11 1.36 0.17 0.86 0.60 18 522
APR 0.13 0.05 1.42 0.21 1.09 0.58 18 618
MAY 0.18 0.10 1.44 0.26 1.67 0.78 16 492
JUN 0.23 0.10 1.64 0.17 2.59 0.61 23 434
JUL 0.27 0.12 1.74 0.13 2.57 0.63 25 517
AUG 0.30 0.12 1.69 0.20 3.24 0.72 24 496
SEP 0.15 0.08 1.60 0.17 2.10 0.65 18 521
OCT 0.10 0.04 1.65 0.16 1.55 0.66 15 480
NOV 0.11 0.05 1.55 0.20 1.13 0.31 15 460
DEC 0.07 0.03 1.43 0.31 0.63 0.35 17 433
YEAR 0.16 0.07 1.56 0.12 1.54 0.91 229 6042

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GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2010
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2010 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.09 0.05 1.43 0.24 0.64 0.30 20 377
FEB 0.11 0.05 1.38 0.33 0.56 0.16 15 419
MAR 0.10 0.07 1.19 0.24 0.74 0.32 16 678
APR 0.16 0.07 1.20 0.28 1.19 0.43 24 846
MAY 0.16 0.10 1.38 0.23 2.02 0.83 20 626
JUN 0.23 0.11 1.71 0.14 2.87 0.89 27 655
JUL 0.28 0.17 1.73 0.20 2.89 0.92 26 792
AUG 0.32 0.13 1.74 0.18 3.01 0.66 23 616
SEP 0.14 0.11 1.61 0.26 2.13 0.64 23 893
OCT 0.12 0.08 1.59 0.22 1.37 0.39 22 786
NOV 0.07 0.04 1.67 0.20 0.90 0.43 22 668
DEC 0.07 0.03 1.56 0.27 0.52 0.21 14 338
YEAR 0.15 0.08 1.52 0.20 1.57 0.97 252 7694

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2011
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2011 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.09 0.06 1.71 0.19 0.53 0.29 14 264
FEB 0.10 0.07 1.42 0.31 0.85 0.59 19 471
MAR 0.12 0.05 1.31 0.25 0.72 0.37 20 573
APR 0.19 0.12 1.51 0.34 1.36 0.65 17 420
MAY 0.22 0.11 1.51 0.19 2.17 0.79 21 433
JUN 0.30 0.19 1.73 0.21 2.59 0.91 26 593
JUL 0.32 0.17 1.81 0.16 3.17 0.96 28 850
AUG 0.23 0.14 1.85 0.16 2.65 0.72 19 543
SEP 0.38 0.23 1.87 0.14 3.07 0.69 9 251
OCT 0.11 0.04 1.65 0.19 1.35 0.43 20 563
NOV 0.07 0.03 1.58 0.29 0.81 0.37 18 534
DEC 0.07 0.02 1.68 0.13 0.74 0.24 17 381
YEAR 0.18 0.11 1.64 0.17 1.67 1.00 228 5876

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2012
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2012 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.03 1.55 0.23 0.75 0.40 22 445
FEB 0.09 0.02 1.52 0.18 0.67 0.32 20 724
MAR 0.16 0.08 1.19 0.40 1.21 0.73 23 769
APR 0.14 0.06 1.28 0.21 1.03 0.53 24 732
MAY 0.24 0.13 1.50 0.19 2.33 0.99 18 572
JUN 0.24 0.18 1.78 0.20 2.29 0.81 25 713
JUL 0.28 0.09 1.84 0.18 3.29 0.62 24 561
AUG 0.32 0.15 1.88 0.21 3.00 0.69 21 467
SEP 0.15 0.11 1.88 0.18 1.96 0.87 23 699
OCT 0.11 0.07 1.68 0.40 1.70 0.62 17 449
NOV 0.08 0.02 1.70 0.12 0.89 0.38 18 493
DEC 0.10 0.07 1.58 0.19 0.96 0.58 15 208
YEAR 0.17 0.08 1.61 0.22 1.67 0.90 250 6832

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Level 2.0 Climatology - Quality Assured Data

GSFC (N 38°59', W 76°50', Alt 87 m )

Year: 2013
Top | Site Index
Aerosol optical depth at 500 nm (taua500), Angstrom exponent (alpha440-870), precipitable water (PW), the associated standard deviations (sigma), the number of days (N) and number of observations in the period (Obs).

2013 Averages of taua500sigma alpha440-870sigma PWsigma NObs

JAN 0.08 0.04 1.62 0.18 0.61 0.42 18 408
FEB 0.09 0.03 1.56 0.19 0.56 0.17 14 406
MAR 0.09 0.04 1.31 0.30 0.70 0.24 17 499
APR 0.16 0.04 1.33 0.23 1.20 0.65 22 756
MAY 0.15 0.08 1.36 0.35 1.79 1.04 20 549
JUN 0.19 0.09 1.68 0.23 2.72 0.81 19 584
JUL 0.21 0.11 1.77 0.31 3.39 0.73 21 518
AUG 0.22 0.15 1.82 0.13 2.55 0.87 19 439
SEP 0.14 0.15 1.63 0.22 1.94 0.98 27 837
OCT 0.21 0.05 1.91 0.05 2.97 0.49 5 137
NOV •••••• •••••• ••••••••• •••
DEC •••••• •••••• ••••••••• •••
YEAR•••••• •••••• ••••••182 5133

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Generated: 22/10/2014