Marine Biogeochemistry

Dr. William Haskell

Dr. William Haskell

Staff Scientist, Program Manager

Dr. Haskell is a Marine Biogeochemist who uses geochemical tracers and sensors on autonomous vehicles to estimate the magnitude and rates of biological production and physical transport mechanisms, which are intimately linked to the sources and fate of nutrients, like C, N and O, within coastal and open ocean ecosystems. His specific research areas include: biological production and export, global biogeochemical cycling of C, N, and O, autonomous sampling platforms, upper ocean physicochemical dynamics, stable and radioisotope tracers, coastal ocean processes, and physical-biological (ecological) interactions.

Much of Dr. Haskell's work utilizes cutting edge, innovative ocean technology, such as biochemical/physical sensors and autonomous assets (buoyancy-driven (gliders and profiling floats) and propelled Autonomous Underwater Vehicles (AUVs)). During his graduate work, he studied the biological response to coastal upwelling in Southern California using radioactive isotopes, sediment traps, O2/Ar, the three stable isotopes of oxygen, and sensors on Slocum gliders. As a postdoctoral researcher, his work included quantifying the influence of internal waves on vertical turbulent mixing of biologically-limiting nutrients over the continental shelves using a propelled AUV (Remus 600) and budgeting biogeochemical tracers of carbon export over a decade in the Northeast Pacific with profiling floats (APEX and Navis) in collaboration with the NASA EXPORTS study.

At Mote, Dr. Haskell manages the Ocean Technology and Marine Biogeochemistry programs, which currently operate two Slocum gliders for routine surveys of the West Florida Shelf and numerous Programmable Hyperspectral Seawater Scanners (PHySS) that provide near-real time detection of Harmful Algal Blooms (HABs) in the region for policy makers, stakeholders and the public.

Education

2015 Ph.D. Ocean Sciences - University of Southern California

2011 M.S. Ocean Sciences - University of Southern California

2009 B.S. Marine Science/Chemistry - University of Miami (RSMAS)

Publications

1. Haskell, W.Z., A.J. Fassbender, J. Long, J. Plant, K.S. Johnson. (in review) Annual net community production of particulate and dissolved organic carbon from a decade of biogeochemical profiling float observations in the Northeast Pacific. Global Biogeochemical Cycles.

2. Haskell, W.Z., D.E. Hammond, M.G. Prokopenko, E.N. Teel, B.N. Seegers, M.A. Ragan, N. Rollins, B. H. Jones (2019) Net community production in a productive coastal ocean from an autonomous buoyancy-driven glider. Journal of Geophysical Research: Oceans, 124, https://doi.org/10.1029/2019JC015048.

3. Haskell, W.Z. and J.C. Fleming. (2018) Concurrent estimates of carbon export reveal physical biases in ΔO2/Ar-based net community production estimates in the Southern California Bight. Jour. of Mar. Sys, 183, pp. 13-23. doi.org/10.1016/j.jmarsys.2018.03.008.

4. Teel, E.N., X. Liu, B.N. Seegers, M.A. Ragen, W.Z. Haskell, B.H. Jones, N.M. Levine. (2018) Contextualizing time-series data: Quantification of short-term regional variability in the San Pedro Channel using high-resolution in-situ glider data. Biogeosciences, 15, 6151-6165. doi.org/10.5194/bg-15-6151-2018.

5. Haskell, W.Z., M.G. Prokopenko, D.E. Hammond, R.H.R. Stanley, Z.O. Sandwith. (2017) Annual cyclicity in export efficiency in the inner Southern California Bight. Global Biogeochemical Cycles, 31, pp. 357-376. doi: 10.1002/2016GB005561.

6. Fassbender, A.J., H.I. Palevsky, T.R. Martz, A.E. Ingalls, M. Gledhill, S.E. Fawcett, J.A. Brandes, L.I. Aluwihare, the participants of COME ABOARD, DISCO XXV. (2017) Perspectives on Chemical Oceanography in the 21st century: Participants of the COME ABOARD Meeting examine aspects of the field in the context of 40 years of DISCO. Marine Chemistry, 196, pp. 181-190. doi.org/10.1016/j.marchem.2017.09.002.

7. Haskell, W.Z., M.G. Prokopenko, D.E. Hammond, R.H.R. Stanley, W.M. Berelson, J.J. Baronas, J.C. Fleming, L. Aluwihare. (2016b) An organic carbon budget for coastal Southern California determined by estimates of upwelled nutrients, net production, and export. Deep-Sea Res. I., 116, pp. 49-76.

8. Haskell, W.Z., M.G. Prokopenko and R.H.R. Stanley. (2016a) Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross O2 production in the oligotrophic South Pacific Gyre. Geophys. Res. Lett., 43, pp. 7590-7599, doi: 10.1002/2016GL069523.

9. Haskell, W.Z., D.E. Hammond, M.G. Prokopenko. (2015b) A dual-tracer approach to estimate upwelling velocity in coastal Southern California. Earth and Planet. Sci. Lett., 422, pp. 138-149.

10. Haskell, W.Z., D. Kadko, D.E. Hammond, M.G. Prokopenko, W.M. Berelson, A.N. Knapp, D.G. Capone. (2015a) Upwelling velocity and eddy diffusivity from 7Be measurements used to compare vertical nutrient flux to export POC flux in the Eastern Tropical South Pacific. Marine Chemistry, 168, pp. 140-150.

11. Berelson, W.M., W.Z. Haskell, M.G. Prokopenko, D. G. Capone, A.N. Knapp, D.E. Hammond, N. Rollins. (2015) Biogenic rain and remineralization in the Eastern Tropical South Pacific. DeepSea Res. I, 99, pp. 23-34.

12. Haskell, W.Z., W.M. Berelson, D.E. Hammond, D.G Capone. (2013) Particle sinking dynamics and POC fluxes in the Eastern Tropical South Pacific based on 234Th and sediment trap deployments. Deep-Sea Res. I, 81, pp.1-13.

Awards & Honors

Invited Participant | Dissertations Symposium in Chemical Oceanography (DISCO XXV) and Chemical Oceanography Meeting: A Bottom-up Approach to Research Directions (COME ABOARD) 2016

Invited Participant | UNOLS Chief Scientist Training Course 2016

National Science Foundation Postdoctoral Research Fellow (OCE-PRF)

Woods Hole Oceanographic Institution Postdoctoral Scholarship | Declined 2015

USC Keck Endowed Graduate Fellowship 2013

USC Sonosky Graduate Fellowship 2011

USC Earth Sciences Department TA Award 2010, 2011

Univ. of Miami George E. Merrick Scholarship 2005 - 2009