I09N_2007_Trace_Metal_CTD

This dataset consists of water column measurements collected from a trace metal CTD during the CLIVAR/GO‑SHIP repeat hydrography section I09N from 22 March to 1 May 2007, a meridional transect from the Bay of Bengal to the South Indian subtropical gyre. Station metadata, hydrographic data, and cruise documentation are provided by the CLIVAR & Carbon Hydrographic Data Office (CCHDO) under expocode 33RR20070322. A trace-metal clean rosette was used to collect seawater from the upper 1000 m of the water column and then subsampled in a clean van for salinity, nutrients, and dissolved and particulate trace metal samples. Filtered (<0.4 µm) samples were collected for shipboard analysis by flow injection methods for dissolved Fe and Al concentrations. Total suspended matter samples were collected onto 0.4 µm filters and analyzed for particulate Al, Si, P, Ca, Mn, and Fe by ED-XRF at NOAA-PMEL. The timestamp is in UTC. For a full description of sampling protocols and analytical methods see: J.A. Resing, C.I. Measures, 1994. Fluorometric determination of Al in seawater by flow injection analysis with in-line preconcentration, Anal. Chem., 66, 4105-4111.C.I. Measures, J. Yuan, J.A. Resing, 1995. Determination of iron in seawater by flow injection analysis using in-line preconcentration and spectrophotometric detection, Limnol. Oceanogr. Methods, 50, 3-12.C.I. Measures, W.M. Landing, M.T. Brownand, C.S. Buck, 2008a. A commercially available rosette system for trace metal-clean sampling, Limnol. Oceanogr. Methods, 6, 384-394.M.M. Grand, C.I. Measures, M. Hatta, W.T. Hiscock, C.S. Buck, W.M. Landing, 2015a. Dust deposition in the eastern Indian Ocean: the ocean perspective from Antarctica to the Bay of Bengal, Glob. Biogeochem. Cycles, 29, 357-374.M.M. Grand, C.I. Measures, M. Hatta, W.T. Hiscock, W.M. Landing, P.L. Morton, C.S. Buck, P.M. Barrett, J.A. Resing, 2015b. Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: a high-resolution transect along 95°E from the Antarctic margin to the Bay of Bengal, Glob. Biogeochem. Cycles, 29, 375-396PM Barrett, JA Resing, MM Grand, CI Measures, WM Landing, 2018. Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions, Chem. Geol., 502, 15-28.PM Barrett, JA Resing, MM Grand, CI Measures, WM Landing, 2026. Distributions of particulate Al and Fe in the Bay of Bengal and south Indian subtropical gyre, Mar. Chem., 104611. We thank the captain and crew of R/V Roger Revelle and chief scientists Janet Sprintall and Sabine Mecking. This research was funded by NSF grants OCE-0223397 to Christopher I. Measures (University of Hawaii), OCE-0223378 to William M. Landing (Florida State University), and OCE-0649505 to Joseph A. Resing (University of Washington and NOAA-PMEL).