geotraces atlantic basin workshop september 2007 aerosol sampling and analysis for geotraces: bill...

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


CLIVAR-Repeat Hydrography A16N-2003

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6359555047454137343131282421181512

9620

-3

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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).


CLIVAR-Repeat Hydrography A16N-2003

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62.81

59.14

54.50

50.03

47.11

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37.49

34.23

31.12

30.94

27.50

24.45

21.06

18.00

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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.


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.

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Aerosol FeT (pmol/m3)

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Aerosol FeT


A16N 34N: Aerosol Fe

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EDXRF DI % Soluble SumDI


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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


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.


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)


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.


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.


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

geotraces atlantic basin workshop september 2007 aerosol sampling and analysis for geotraces: bill...

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