ࡱ> MOL @ $bjbj)) "<KzKz tttt4$ $> #######$$R '#####}"" p CONTRIBUTORS Douglas W.R. Wallace (CHIEF SCIENTIST) Leibniz Institute of Marine Sciences at Kiel University Marine Biogeochemistry Duesternbrooker Weg 20 D-24105 Kiel, Germany Email:  HYPERLINK "mailto:dwallace@ifm-geomar.de" dwallace@ifm-geomar.de SCOPE Hydrographical and chemical data made during the German Meteor 55 (M55) cruise in the tropical North Atlantic. Start of cruise: 2002.10.13 in Willemstad. End of cruise: 2002.11.17 in Duala. DATA DESCRIPTION The methods, corrections and post-cruise calibration procedures are described below. CTD WORK The temperature and salinity are reported on the ITS-90 and PSS-78 calibration scales, respectively. For more information regarding CTD data, contact Jens Schafstall ( HYPERLINK "mailto:jschafstall@ifm-geomar.de" jschafstall@ifm-geomar.de). The CTD underwater unit was a SBE 9+. TOTAL ALKALINITY Potentiometric titration [Mintrop et al., 2000]. CRM corrected from batch 60. The mean difference between measurements and the Certified values was 0.8 ( 2.37 (mol kg-1 (95% confidence interval, n=16). Alkalinity values have been adjusted to the certified value by addition of this mean offset. The alkalinity samples were measured after the cruise in the lab in Kiel. DISSOLVED INORGANIC CARBON (DIC) Coulometric titration [Johnson et al., 1993]. CRM corrected from batch 60. Mean offset between our measurements and the Certified Values was 0.12 ( 0.84 (mol kg-1 (95% confidence interval, n = 17). Measured DIC concentrations were therefore adjusted to the Certified calibration scale by subtraction of this mean offset. The DIC samples were measured after the cruise in the lab in Kiel. OXYGEN Oxygen measurements performed by Frank Malien ( HYPERLINK "mailto:fmalien@ifm-geomar.de" fmalien@ifm-geomar.de) by means of Winkler titration. NUTRIENTS Nutrient analysis performed by Frank Malien ( HYPERLINK "mailto:fmalien@ifm-geomar.de" fmalien@ifm-geomar.de). The relative standard deviation of the high standard concentration was less than 1%. The ammonium data are noisy, and are all flagged. DATA FORMAT The data are supplied in comma separated format (.csv). Units for nutrients, oxygen, DIC and alkalinity are umol/kg. Missing data are denoted with 999. OTHER MESUREMENTS N2O; Contact Hermann Bange ( HYPERLINK "mailto:hbange@ifm-geomar.de" hbange@ifm-geomar.de) Carbon isotopes; Contact Douglas Wallace ( HYPERLINK "mailto:dwallace@ifm-geomar.de" dwallace@ifm-geomar.de) Bioincubations; Contact Matthew Mills ( HYPERLINK "mailto:mmmills@stanford.edu" mmmills@stanford.edu) Trace metals; Contact Peter Croot ( HYPERLINK "mailto:pcroot@ifm-geomar.de" pcroot@ifm-geomar.de) Brominated organohalgens and light alkyl nitrates; Contact Douglas Wallase ( HYPERLINK "mailto:dwallace@ifm-geomar.de" dwallace@ifm-geomar.de). Underway pCO2: Contact Arne Krtzinger ( HYPERLINK "mailto:akoertzinger@ifm-geomar.de" akoertzinger@ifm-geomar.de). DMS: Contact Hermann Bange ( HYPERLINK "mailto:hbange@ifm-geomar.de" hbange@ifm-geomar.de ). Chlorophyll a, phytoplankton pigments, flow cytometry, Utermhl microscopy, particulate phosphorus, POC, PON, N-15 and C-13 in particulate matter, particulate biogenic silica, total seston: Contact Ilka Pekeen ( HYPERLINK "mailto:ipekeen@ifm-geomar.de" ipekeen@ifm-geomar.de ). See cruise report for more information on measurements and preliminary results. REFERENCES Mintrop, L., F.F. Perez, M. Gonzalez-Davila, J.M. Santana-Casiano, and A. Krtzinger (2000), Alkalintiy determination by potentiometri: intercalibration using three different methods, Scienc. Mar., 26, 1, 23-37. Johnson, K., K.D. Willis, D.B. Butler, W.K. Johnson, and C.S. Wong (1993), Coulometric carbon dioxide analysis for marine studies: Maximizing the performance of an automated gas extraction system and coulometric detector, Mar. Chem., 44 (2-4), 167-188. Articles based on data collected during the M55 cruise Mills, M.M., C. Ridame, M. Davey, J. LaRoche, R. Geider, Iron and phosphorus co-limit nitrogen fixation in the eastern tropical North Atlantic, Nature 429, 292 - 294 (20 May 2004); doi:10.1038/nature02550 Gros V., J. Williams, M. G. Lawrence, R. von Kuhlmann, J. van Aardenne, E. Atlas, A. Chuck, D. P. Edwards, V. Stroud, M. Krol (2004), Tracing the origin and ages of interlaced atmospheric pollution events over the tropical Atlantic Ocean with in situ measurements, satellites, trajectories, emission inventories, and global models, J. Geophys. Res., 109, D22306, doi:10.1029/2004JD004846. Walter, S., Bange, H.W., Breitenbach, U. and Wallace, D.W.R., 2006. Nitrous oxide in the North Atlantic Ocean. Biogeosci., 3: 607-619. Baker, A.R., Weston, K., Kelley, S. D., Voss, M., Streu, P., and Cape, J. N., 2007. Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation. Deep-Sea Res. I, in press. Williams, J., Gros, V., Atlas, E., Macieczyk, K., Batsaikhan, A., Schoeler, H.F., Forster, C., Quack, B., Yassaa, N., Sander, R., and Van Dingenen, R., 2007. Possible evidence for a connection between methyl iodide emissions and Saharan dust. J. Geophys. Res., 112: D07302, doi:10.1029/2005JD006702. Geophysical Research Letters Special Section Baker, A. R. (2004), Inorganic iodine speciation in tropical Atlantic aerosol, Geophys. Res. Lett., 31(23), L23S02, doi:10.1029/2004GL020144. Croot, P. L., P. Streu, and A. R. Baker (2004), Short residence time for iron in surface seawater impacted by atmospheric dry deposition from Saharan dust events, Geophys. Res. Lett., 31(23), L23S08, doi:10.1029/2004GL020153. Croot, P. L., P. Streu, I. Peeken, K. Lochte, and A. R. Baker (2004), Influence of the ITCZ on H2O2 in near surface waters in the equatorial Atlantic Ocean, Geophys. Res. Lett., 31(23), L23S04, doi:10.1029/2004GL020154. Krtzinger, A., A significant CO2 sink in the tropical Atlantic Ocean associated with the Amazon River plume, Geophys. Res. Lett., 30(24), 2287, doi:10.1029/2003GL018841, 2003. Quack, B., E. Atlas, G. Petrick, V. Stroud, S. Schauffler, and D. W. R. Wallace (2004), Oceanic bromoform sources for the tropical atmosphere, Geophys. Res. Lett., Geophys. Res. Lett., 31(23), L23S05, doi:10.1029/2004GL020597. Richter, Uwe; Wallace, Douglas W. R., Production of methyl iodide in the tropical Atlantic Ocean, Geophys. Res. Lett., 31(23), L23S03, doi:10.1029/2004GL020779. Voss, M., P. Croot, K. Lochte, M. Mills, and I. Peeken (2004), Patterns of nitrogen fixation along 10N in the tropical Atlantic, Geophys. Res. Lett., 31(23), L23S09, doi:10.1029/2004GL020127. Walter, S., H. W. Bange, and D. W. R. Wallace (2004), Nitrous oxide in the surface layer of the tropical North Atlantic Ocean along a west to east transect,, Geophys. Res. Lett., 31(23), L23S07, doi:10.1029/2004GL019937. Wallace, D. W. R., and H. W. Bange (2004), Introduction to special section: Results of the Meteor 55: Tropical SOLAS Expedition, Geophys. Res. Lett., 31, L23S01, doi:10.1029/2004GL021014. Williams, J., R. Holzinger, V. Gros, X. Xu, E. Atlas, and D. W. R. Wallace (2004), Measurements of organic species in air and seawater from the tropical Atlantic, Geophys. Res. Lett., 31(23), L23S06, doi:10.1029/2004GL020012. 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