geotraces atlantic basin workshop september 2007 aerosol sampling and analysis for geotraces: bill...
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GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
Aerosol Sampling and Analysis Aerosol Sampling and Analysis
for GEOTRACES:for GEOTRACES:Bill LandingBill Landing
Department of OceanographyDepartment of Oceanography
Florida State UniversityFlorida State University
Tallahassee, FL 32306-4320Tallahassee, FL 32306-4320
850-644-6037850-644-6037
[email protected]@fsu.edu
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
CLIVAR-Repeat Hydrography A16N-2003
0 20,000 40,000 60,000 80,000
6359555047454137343131282421181512
9620
-3
Latitude
Total Aerosol Fe (pmol/m^3)
Shipboard aerosol sampling and satellite imagery show good Shipboard aerosol sampling and satellite imagery show good agreement for mineral dust concentrations (field calibration agreement for mineral dust concentrations (field calibration
important if we want to use satellite imagery).important if we want to use satellite imagery).
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
CLIVAR-Repeat Hydrography A16N-2003
0 20 40 60 80
62.81
59.14
54.50
50.03
47.11
44.50
40.50
37.49
34.23
31.12
30.94
27.50
24.45
21.06
18.00
15.00
11.66
8.67
5.67
2.33
-0.36
-3.00
Latitude
Aerosol Fe Flux (umol/m 2̂/day)
Two days later……~100x lower in qualitative agreement with TOMS imagery.
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
Imprint of Atmospheric Dust Input on Upper Ocean Chemistry
A16N, North Atlantic: High aerosol Fe is expressed in high dissolved Fe (8x) and particulate Fe (20x) in surface waters. Residence times with respect to atmospheric deposition range from 3-10 days.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65
Latitude
[Fe] (nM)
0.1
1.0
10.0
100.0
1000.0
10000.0
100000.0
Aerosol FeT (pmol/m3)
Fe-D
Fe-P
Aerosol FeT
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
A16N 34N: Aerosol Fe
0
50
100
150
200
250
300
350
400
Particle Size (um)
0
10
20
30
40
50
60
70
80
90
100
EDXRF DI % Soluble SumDI
A16N 15N: Aerosol Fe
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
Particle Size (um)
0
10
20
30
40
50
60
70
80
90
100
EDXRF DI % Soluble SumDI
A16N 12N: Aerosol Fe
0
100
200
300
400
500
600
700
800
900
Particle Size (um)
0
10
20
30
40
50
60
70
80
90
100
EDXRF DI % Soluble SumDI
A16N 18N: Aerosol Fe
0
500
1000
1500
2000
2500
3000
183.16 1.78 0.97 0.56 0.32 0.18 0.098 0.056 Total
Particle Size (um)
[Aerosol] (pmol/m3)
0102030405060708090100
Percent Soluble
EDXRF DI % Soluble SumDI
A16N, North Atlantic: Soluble aerosol Fe in size-fractionated samples is dominated by >1um particles. Fractional Fe solubility (blue symbols) in fine particles is not significantly enhanced.
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
Water column dissolved: Fe, Ni, Cu, Zn, Cd, and Pb by isotope dilution ICPMS; Mn and Co by std adds ICPMS
Rainfall and DI solubility leaches: HR-ICPMS (47 elements)
Aerosol and TSM EDXRF (Joe Resing; PMEL/UW)
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
NSF Proposal August 15, 2007 (US and International participation being actively sought).
GEOTRACES: Intercalibration for Aerosol Sampling and Analysis
1. acquire high-volume sampling equipment to be made available for deployment on GEOTRACES research cruises for the collection of total aerosols (TSP) and size-fractionated aerosols on low-blank filter matrices that can be subsampled and shared with colleagues around the world.
2. acquire automated rainwater sampling equipment to be made available for deployment on GEOTRACES research cruises for the collection of large volumes of unfiltered and filtered rainfall that can be subsampled and shared.
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
3. Test and intercalibrate the equipment during two field experiments (2008 on the RSMAS-University of Miami roof and 2009 on the Tudor Hill Marine-Atmospheric Observatory Sampling Tower in Bermuda).4. Invite collaborators from the US and elsewhere to participate in sampler intercalibration during the field experiments.5. Distribute aerosol and rainwater subsamples to collaborators from the US and elsewhere for the purposes of intercalibrating analytical methods.6. Collect intercalibration data from the various collaborators and produce an intercalibration document (for journal publication).7. Prepare “handbooks” describing the atmospheric sampling and analytical protocols for use on GEOTRACES cruises; to be shared with our US and international GEOTRACES colleagues.
GEOTRACES Atlantic Basin Workshop September 2007GEOTRACES Atlantic Basin Workshop September 2007
Email list
Brief summaries of ongoing aerosol and rainfall projects
Cruise sampling and island sites
Collect references and anecdotal information on methods, cleaning, etc.
Sensors: optical depth, CCN, others
Rainfall sampling, filtration
TSP, size fractionated aerosols
Marine Chemistry special issue
What to measure? TEIs, exotic isotopes