Title: Discoverer Aerosol Optical Depth

Contact:

   Patricia Quinn
   OCRD
   NOAA/Pacific Marine Environmental Laboratory
   7600 Sand Point Way NE
   Seattle, WA, USA, 98115
   Telephone: (206) 526-6892
   Facsimile: (206) 526-6744
   E-Mail Address: quinn@pmel.noaa.gov


Data Set Description:

NOAA/PMEL and NOAA/CMDL ACE-1, Legs 1 and 2 Aerosol Optical Depth (AOD)
As measured by CMDL's handheld sunphotometers.

(P. Quinn, Feb. 25, 1997).

Notes on data reduction:

Calibration of the sunphotometers is based on Langley plots derived from
measurements at Mauna Loa.

The relative air mass, (mr), was calculated using Kasten's formula.

The total measured optical depth was used to calculate the Aerosol
Optical Depth (AOD) by subtracting Rayleigh and ozone extinction, i.e.

AOD = TotalOD - OD,Rayleigh - OD,ozone

where

OD, Rayleigh = P/Po x 0.00877l-4.05 + d(l)

and P = the atmospheric pressure during the observation, Po is standard
atmospheric pressure (1013.25 mb), and d(l) is a time-dependent
minor correction for a shift in the filter l.

OD,ozone = 0.01 at 500 nm and negligible at all other wavelengths.

The 380 nm channel displayed a severe drift after Day of Year (DOY) 338.
Therefore, these data have been removed  from the record.

Format: comma-delimited ASCII.

1, DATE (YYYY/MM/DD) (UTC)
2, TIME (HH:MM:SS) (UTC)
3, DOY GMT (Julian Decimal Date) (UTC)
2, Decimal Latitude
3, Decimal Longitude
4, AOD, 380 nm
5, AOD, 500 nm
6, AOD, 778 nm
7, AOD, 862 nm
8, comments (text)
9, AVHRR overpass


File Name Conventions:
   quin_aod.dat

References: None.