GACP Datasets

NOAA PMEL In-situ Aerosol Data Base Dataset

Contacts:
Tim Bates (bates@pmel.noaa.gov)
Trish Quinn (quinn@pmel.noaa.gov)

Measurement Approach

  • Local contamination is avoided by using a sector-controlled inlet. Local wind speed, wind direction, and particle concentration are used to determine sampling periods.
  • The sampled aerosol is dried to a reference RH in order to maintain constant instrumental cut sizes through variations in RH. In this way, data obtained from all instruments are directly comparable.
  • All chemical measurements are performed on size segregated aerosol thus recognizing the strong dependence of aerosol optical properties on particle size.

Temporal and Spatial Coverage Dataset

Cruise (Research Vessel) Date Location
 
PSI-3 (1991) 15 April 1991 Seattle, WA
(Discoverer)   Washington Coast
  1 May 1991 Seattle, WA
 
RITS-1992 21 February 1992 Los Angeles, CA .
(Vickers) 11-12 March 1992 Marquesas Is.
(IGAC-MAGE) 25 March 1992 Los Angeles, CA
 
RITS-1993 20 March 1993 Punta Arenas, Chile
(Surveyor) 24-25 March 1993 Palmer Station, Antarctica
  1 April 1993 68°S, 140° W
  15-19 April 1993 Papeete, Tahiti
  4 May 1993 54°N, 140°W
  7 May 1993 Seattle, WA
 
RITS-1994 20 November 1993 Seattle, WA
(Surveyor) 23 November 1993 55°N, 140°W
  13-17 December 1993 Papeete, Tahiti
  28 December 1993 68°S, 130°W
  3-4 January 1994 Palmer Station, Antarctica
  7 January 1994 Punta Arenas, Chile
 
ACE-1 (1995) 11 October 1995 Seattle, WA
(Discoverer) 19 October 1995 Honolulu, HI
  30 October 1995 30°S, 160°W
  10-15 November 1995 Hobart, Australia
  13 December 1995 Hobart, Australia
 
CSP-1 (1996) 14 March 1996 American Samoa
(Discoverer) 17 March 1996 2°S, 180°W
  27-31 March 1996 2°S, 147°E
  8 April 1996 1°S, 180°W
  13 April 1996 Honolulu, HI
 
ACE-2 (1997) 19 June 1997 Lisbon, Portugal
(Vodyanitskiy)   8-15°W, 29-41°N
  24 July 1997

Lisbon, Portugal

  • PSI - Pacific Sulfur/Stratus Investigation (1991)
  • RITS - Radiatively Important Trace Species (1992, 1993, 1994)
  • IGAC-MAGE - International Global Atmospheric Chemistry Program's Marine Aerosol and Gas Exchange Equatorial Pacific Experiment (1992)
  • ACE - IGAC Aerosol Characterization Experiment (1995, 1997)
  • CSP - Combined Sensor Program (1996)

Measured Properties Dataset

Aerosol Physical Properties

Property Symbol Method
Number concentration N Dp > 3 nm, UCPCa
Dp > 12 nm, CPCb
Number size distribution dN/dlogDp 5 < Dp < 28 nm: DMPSc
20 < Dp < 600 nm: DMPSd
0.5 < Dp < 10 μm: APSe

Aerosol Chemical Properties

Property Symbol Method
Chemical mass size distribution dm/dlogDp Collection with impactor followed by chemical analysis for ionsf, elemental and organic carbong, total massi
Refractive index m Chemical equilibrium model
Density ρ Chemical equilibrium model

Aerosol Optical Properties

 Property  Symbol  Method
Scattering coefficient σsp (λ) Integrating nephelometer 450, 550, and 650 nm
Backscattering coefficient σbsp (λ) Integrating nephelometer 450, 550, and 650 nm
Backscattered fraction b  
Absorption coefficient for soot aerosol σap (λ) PSAPj at 550±20 nm
Scattering phase function f(λ, q )  Mie calculation
Asymmetry parameter g  Mie calculation
Single scattering albedo ωo  Mie calculation
Mass scattering efficiency of component i αsp,i  Mie calculation
Particle optical depthk δp(λ) Sunphotometer

a-ultra-fine condensation particle counter
b-condensation particle counter
c-ultra-fine differential mobility analyzer and UCPC
d-differential mobility analyzer and CPC
e-aerodynamic particle sizer
f-ion chromatography
g-thermo-optical techniques (ACE 2 only)
i-gravimetry
j-particle soot absorption photometer
k-available for RITS 93 (390 and 500 nm), RITS 94 (380 and 500 nm), ACE 1 (380, 500, 672, and 778 nm)

Data Format

Data are available as ASCII files. ACE 1 data are available at the ACE 1 project page at UCAR/OFPS (http://www.ofps.ucar.edu/cgi-bin/codiac/projs?ACE-1). All other data sets are available from NOAA PMEL.