Journal of Geophysical Research: Oceans Supporting Information for Variability in diatom contributions to biomass, organic matter production and export across a frontal gradient in the California Current Ecosystem Jeffrey W. Krause a,b, Mark A. Brzezinski a,c, Ralf Goericke d, Michael R. Landry d, Mark D. Ohman d, Michael R. Stukel e, f, Andrew G. Taylor d a Marine Science Institute, University of California, Santa Barbara, California b Dauphin Island Sea Lab, Dauphin Island, Alabama c Department of Ecology Evolution and Marine Biology, University of California, Santa Barbara, California d Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California e Horn Point Laboratory, University of Maryland, Cambridge, Maryland f Current Address: Florida State University, Earth, Ocean, and Atmospheric Science Department Tallahassee, Florida Additional Supporting Information (Files uploaded separately) Introduction The supporting data files are in tab delimited text format. Each file presents the profile data collected during the California Current Ecosystem (CCE) Long Term Ecological Research (LTER) program’s P1106 cruise aboard the R/V Melville from 18 June – 17 July 2011 presented in this manuscript. This cruise used a quasi-Lagrangian approach to sample three types of water masses associated with a front or on the oceanic or coastal sides of the front. Six three-day Lagrangian experiments (termed “Cycles”) were conducted in each water type and a high-resolution spatial transect was conducted through the frontal region. Supporting data files are separated by Cycle type (i.e. oceanic, frontal or coastal) and the transect. These data are also available through CCE LTER data archive at http://oceaninformatics.ucsd.edu/datazoo/ or upon request. This work was supported by the CCE LTER program under award OCE 1026607 (awarded to MDO, MRL, RG) by the National Science Foundation. Data Set S1 (Krauseetal-ds01.txt). Profile data for California Current Ecosystem (CCE) Long Term Ecological Research (LTER) process cruise P1106 Oceanic Cycles (2 and 5). Data include: CTD temperature (°C), salinity (psu) and potential density (kg m-3), silicic acid (μmol L-1), autoanalyzer phosphate (μmol L-1), autoanalyzer nitrate (μmol L-1), biogenic silica (μmol Si L-1), Chlorophyll a (μg L-1), biogenic silica production (μmol Si L-1 d-1) and biomass-normalized specific biogenic silica production (d-1). Stations are denoted by cycle number (i.e. C#), day during a cycle (i.e. D#). Values of “-999” denote no data. Data Set S2 (Krauseetal-ds02.txt). Profile data for California Current Ecosystem (CCE) Long Term Ecological Research (LTER) process cruise P1106 Frontal Cycles (1 and 6). 1 Data include: CTD temperature (°C), salinity (psu) and potential density (kg m-3), silicic acid (μmol L-1), autoanalyzer phosphate (μmol L-1), autoanalyzer nitrate (μmol L-1), biogenic silica (μmol Si L-1), Chlorophyll a (μg L-1), biogenic silica production (μmol Si L-1 d-1) and biomass-normalized specific biogenic silica production (d-1). Stations are denoted by cycle number (i.e. C#), day during a cycle (i.e. D#). Values of “-999” denote no data. Data Set S3 (Krauseetal-ds03.txt). Profile data for California Current Ecosystem (CCE) Long Term Ecological Research (LTER) process cruise P1106 Coastal Cycles (3 and 4). Data include: CTD temperature (°C), salinity (psu) and potential density (kg m-3), silicic acid (μmol L-1), autoanalyzer phosphate (μmol L-1), autoanalyzer nitrate (μmol L-1), biogenic silica (μmol Si L-1), Chlorophyll a (μg L-1), biogenic silica production (μmol Si L-1 d-1) and biomass-normalized specific biogenic silica production (d-1). Stations are denoted by cycle number (i.e. C#), day during a cycle (i.e. D#). Values of “-999” denote no data. Data Set S4 (Krauseetal-ds04.txt). Profile data for California Current Ecosystem (CCE) Long Term Ecological Research (LTER) process cruise P1106 transect. Data include: CTD temperature (°C), salinity (psu) and potential density (kg m-3), silicic acid (μmol L1), autoanalyzer phosphate (μmol L-1), autoanalyzer nitrate (μmol L-1), biogenic silica (μmol Si L-1) and Chlorophyll a (μg L-1). Values of “-999” denote no data. 2