EDUCATION:    
       
  2011
Ph.D. University of California, Santa Cruz, Ocean Science Department
Advisor: Matthew D. McCarthy		  
       
  2000 to 2004 B.S. University of California, Santa Cruz, Earth and Planetary Science (Ocean Science concentration). Honors in Major, Cowell College Honors. Thesis Advisors: Andrew Fisher, Matthew D. McCarthy  
       
       
  POSITIONS HELD:  
       
  2006 to 2010 Teaching Assistant, University of California, Santa Cruz. Courses: The Oceans, Our Changing Planet, The Marine Environment  
  2010 Woods Hole Oceanographic Institute, National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Graduate Internship. Director: William Jenkins  
  2007 to 2009 Research Assistant, Stable Isotope Laboratory: DI-IRMS: Optima, Prism/CF-IRMS: EA, Gasbench, GC, UCSC  
  2006 Teaching Assistant, COSMOS - Ocean Dynamics: From Wind to Whales, University of California, Santa Cruz  
  2004 to 2005 Junior Research Specialist: Marine Organic Geochemistry. Matthew D. McCarthy, University of California, Santa Cruz  
  2004 Woods Hole Oceanographic Institute, Summer Student Fellow (NSF-REU): Bernhard-Peucker Ehrenbrink  
       
       
  DETAILED TEACHING EXPERIENCE:  
       
  2010 (Fall) Teaching Assistant, OCEA 80B: Our Changing Planet, University of California, Santa Cruz  
  2010 (Spring) Teaching Assistant, OCEA 80B: Our Changing Planet, University of California, Santa Cruz  
  2010 (Winter) Teaching Assistant, OCEA 80B: Our Changing Planet, University of California, Santa Cruz  
  2009 (Fall) Teaching Assistant, OCEA 1: The Oceans, University of California, Santa Cruz  
  2009 (Winter) Teaching Assistant, OCEA 101: Marine Environment, University of California, Santa Cruz  
  2008 (Winter) Teaching Assistant, OCEA 101: Marine Environment, University of California, Santa Cruz  
  2007 (Winter) Teaching Assistant, OCEA 80B: Our Changing Planet, University of California, Santa Cruz  
  2006 (Spring) Teaching Assistant, OCEA 80B: Our Changing Planet, University of California, Santa Cruz  
  2006 (Summer) Teaching Assistant, COSMOS - Ocean Dynamics: From Wind to Whales, University of California, Santa Cruz  
       
       
  FIELD EXPERIENCE:  
       
  2004 to 2009 GC-MPSL (Granite Canyon Marine Pollution Studies Lab), Established and maintained ongoing shore based geochemical time series field/lab - main dissertation sample set. Carmel, CA.  
  2005 (Winter) NELHA (Natural Energy Laboratory of Hawaii Authority), Isolation of Oligotrophic UDOM. Kona, HI.  
  2004 (Summer) R/V Tioga, Estuarine behavior of Rhenium and Molybdenum. Hudson River, NY.  
  2003 (Summer)

R/V Thompson, LEXEN Project. Juan de Fuca Ridge. Astoria, OR.

  
       
       
  PUBLICATIONS:    
       
  Walker B.D., S.R. Beaupre, T.P. Guilderson, E.R.M. Druffel, M.D. McCarthy. (2011) Large-volume ultrafiltration for the study of marine dissolved organic matter radiocarbon signatures. Geochimica et Cosmochimica Acta (75) p.5187-5202. pdf (397 KB)  
       
  Christian A. Miller, Bernhard Peucker-Ehrenbrink, Brett D. Walker, Franco Marcantonio. (2011) Re-assessing the surface cycling of molybdenum and rhenium. Geochimica Cosmochimica Acta (75) p.7146-7179. pdf (1.44 MB)  
       
McCarthy M.D., Beaupre S.R., Walker B.D., Voparil, I., Guilderson, T.P., Druffel, E.R.M. (2010) Chemosynthetic 14C-depleted dissolved organic carbon in a ridge-flank hydrothermal system. Nature Geoscience (4) p.32-36. DOI: 10.1038/NGEO1015. pdf (508 KB)  
       
  Roland L.A., McCarthy M.D., Peterson T.D., Walker B.D. (2009) A large-volume micro-filtration system for isolating suspended particulate organic matter: fabrication and assessment vs. GFF filters in central N. Pacific. L&O Methods (7) p.64-80. pdf (1.79 MB)  
       
  Walker B.D., McCarthy M.D., Fisher A.T., Guilderson T.P. (2008) Dissolved inorganic carbon isotopic composition of low-temperature axial and ridge-flank hydrothermal fluids of the Juan de Fuca Ridge. Marine Chemistry (108) p. 123-136. pdf (524 KB)  
       
  PUBLICATIONS IN PROGRESS:  
       
  Walker B.D., S.R. Beaupre, T.P. Guilderson, E.R.M. Druffel, M.D. McCarthy. Evidence for the size-age continuum of marine dissolved organic matter. In prep for Nature Geoscience.  
       
  Walker B.D., M.D. McCarthy. Elemental and stable isotopic composition of dissolved and particulate organic matter within a coastal HNLC upwelling system. In prep for Limnology and Oceanography.  
       
  Walker B.D., T.P. Guilderson, K.M. Okimura, M.D. McCarthy. Radiocarbon signature and size-age continuum of organic matter within a California upwelling system. In prep for Marine Chemistry.  
       
  Walker B.D., T.P. Guilderson, M.D. McCarthy. Acid soluble organic matter radiocarbon signatures as a proxy for upwelling-derived organic carbon flux from coastal margins. In prep for GCA.  
       
  PRESENTATIONS AT NATIONAL AND INTERNATIONAL MEETINGS:  
       
  Walker B.D., Guilderson, T.P., McCarthy, M.D. Evaluation of acid soluble organic matter radiocarbon signatures as a new proxy for directly tracing upwelling-derived organic carbon in the California Current System. Oral Presentation. ASLO Ocean Sciences Meeting. February 22-26th, 2010, Portland, OR.  
       
  Okimura K.M., McCarthy, M.D., Walker, B.D. A Study of Trophic Interactions and Nutrient Cycling in Coastal Upwelling Systems. Poster Presentation. ASLO Ocean Sciences Meeting. February 22-26th, 2010, Portland, OR.  
       
  Walker B.D., Guilderson, T.P., McCarthy, M.D. Examining linkages between seasonal upwelling and major biochemical reservoirs within the California Current System: a natural abundance radiocarbon approach. Poster. Gordon Research Conference: Chemical Oceanography. August 2-7th, 2009, Tilton, NH.  
       
  McCarthy M.D., Beaupre S.R., Walker B.D., Voparil, I., Guilderson, T.P., Druffel, E.R.M. DOC from off-axis hydrothermal circulation: An unrecognized source of "Pre-AGED" autochthonous material to the deep ocean. Poster, Chemical Oceanography in a Changing World. February 22-24th, 2009, Savanna, GA.  
       
  Walker B.D., Granite Canyon Marine Pollution Studies Laboratory 2008 Research Symposium. Upwelling and the California Current System: A Dynamic Source of Dissolved and Particulate Organic Matter. Guest: Congressman Sam Farr. May 16th, 2008, Carmel, CA.  
       
  Peucker-Ehrenbrink, B., Miller, C.A., Walker B. (2007), Riverine Re and Mo Inputs to Seawater, EOS Trans. AGU, 88 (52), Fall Meet Suppl., Abstract B23B-1272.  
       
  Walker B.D., S.R. Beaupre, L.A. Roland, T.P. Guilderson, E.R.M. Druffel, M.D. McCarthy. Carbon isotopic composition and reactivity across the dissolved organic matter continuum. Poster, ASLO Aquatic Sciences Meeting. February 4-9th, 2007, Santa Fe, NM.  
       
  Walker B., A. Fisher, T. Guilderson, M. McCarthy. Use of DIC 14C fluid ages to estimate mixing of crustal fluid reservoirs, Juan de Fuca Ridge. Poster, AMS-10 Meeting. September 5-10th, 2005, Berkeley, CA.  
       
  Walker B., A.T. Fisher, T.P. Guilderson, M.D. McCarthy. DIC 14C ages of fluid from ridge flank hydrothermal systems, Juan de Fuca Ridge. Poster, ASLO Aquatic Sciences Meeting. February 20-25th, 2005, Salt Lake City, UT.  
       
  Walker B.D., B. Peucker-Ehrenbrink. Evidence for non-conservative behavior of rhenium in aquatic systems. Poster, ASLO Aquatic Sciences Meeting. February 20-25th, 2005. Salt Lake City, UT.  
       
  Walker B.D., B. Peucker-Ehrenbrink. Rhenium and molybdenum in rivers and estuaries. Poster, AGU Meeting. December 13-17th, 2004. San Francisco, CA.  
       
       
  OTHER TALKS AND GUEST LECTURES:  
       
  Invited Speaker: UC Santa Cruz, Department of Ocean Science. A new 14C-based method for directly tracing upwelling-derived and pre-aged organic carbon flux from a coastal upwelling plume. March 3rd, 2010.  
       
  Invited Speaker: Woods Hole Oceanographic Institution, A new 14C-based method to quantify upwelling-derived organic carbon flux from coastal margins. February 10th, 2010.  
       
  Guest Lecture: Effective Strategies for Teaching Undergraduates in Ocean Science. November 2nd, 2009. UC Santa Cruz, OCEA-296, Teaching in Ocean Sciences (Prof. Chris Edwards).  
       
  Guest Lecture: Plate Tectonics - Plate Boundaries and their Global Consequences. October 5th, 2009. UC Santa Cruz, OCEA-01, The Oceans (Prof. Matthew McCarthy).  
       
  Invited Speaker: Friends of Long Marine Lab 2007 Global Oceans Gala, Upwelling and the California Current System: A Dynamic Source of Coastal Dissolved Organic Matter. April 14th, 2007. Guest: Congressman Leon Panetta.  
       
       
  FUNDING AND GRANTS:  
       
 
2011
 Doctoral Student Sabbatical Fellowship - University of California, Santa Cruz
Ocean Sciences Graduate Student Support Award - UCSC Department of Ocean Science		  
       
 
2009
 Friends of Long Marine Lab, Student Research Award. Proposal: "Investigating the Production and Molecular Structure of Dissolved Organic Matter (DOM) Within the California Current System: a New Approach Using NMR and Multivariate Statistics"  
       
 
2008
 UC Santa Cruz, Institute of Geophysics and Planetary Physics (IGPP): Graduate Student Mini-Grant. Proposal: "Molecular and Isotopic Composition of DOC Produced within the California Current
System: A Combined Nuclear Magnetic Resonance and Radiocarbon Approach." 		 
       
 
2007

- Earl H. Myers and Ethel M. Myers Oceanographic and Marine Biology Trust: Graduate Student Research Award.
- STEPS Institute for Innovation in Environmental Research: Graduate Student Grant.
- UC Santa Cruz, Institute of Geophysics and Planetary Physics (IGPP): Graduate Student Mini-Grant.
- Center for the Dynamics and Evolution of the Land-Sea Interface (CDELSI): Graduate Student Research Award.
Proposal: "Establishing linkages between seasonal upwelling and major biochemical reservoirs within the California Current System."

 
       
 
2004
 Friends of Long Marine Lab, Student Research Award. Undergraduate Thesis: Fluid Transport Through Oceanic Crust: Circulation Between Off-Axis Seamounts of the Juan de Fuca Ridge System and Implications for a Crustal Biosphere. Advisors: Matt McCarthy, Andy Fisher.  
       
       
  HONORS AND AWARDS:  
       
 
2010
 Outstanding University Teaching Assistant Award - University of California, Santa Cruz
Outstanding Student Achievement Award - UCSC Department of Ocean Science
Outstanding Teaching Assistant Award - UCSC Department of Ocean Science		  
       
 
2009
 Woods Hole Oceanographic Institute, National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Graduate Student Internship. One of two recipients. Director: William Jenkins, Advisor: Ann McNichol
  
    Proposal: "A new 14C-based method to quantify upwelling-derived organic carbon flux from coastal margins"  
 
   
 
2007

Global Oceans Award, Friends of Long Marine Lab (Top Proposal).

  
 
   
 
2007
 Outstanding Student Poster Award. ASLO Aquatic Sciences Meeting: Carbon isotopic composition and reactivity across the dissolved organic matter continuum.  
 
   
 
2005
 Outstanding Student Poster Award. ASLO Aquatic Sciences Meeting: Evidence for non-conservative behavior of rhenium in aquatic systems.  
 
   
 
2004
 Woods Hole Oceanographic Institute, Summer Student Fellow. Estuarine Behavior of Rhenium and Molybdenum Along the Hudson River Salinity Gradient. Advisor: Bernhard Peucker-Ehrenbrink.  
 
   
 
2004
 Honors in Earth Science Major, Cowell College Honors  
 
   
 
1999 to 2000
 Rotary International Youth Exchange (RYE), U.S. Ambassador - Tucuman, Argentina  
       
       
  VOLUNTEER ACTIVITIES:  
       
 
2009 to 2010
 Graduate Student Representative, UCSC Department of Ocean Science  
 
2010
 Surfrider Foundation, Santa Cruz: Water Quality Sample Collector.