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MITCHELL, B. GREGORY

Research Biologist

Senior Lecturer

Degrees:

• B.S., University of Texas, Austin
• Ph.D., University of Southern California

Research Interests:

• Phytoplankton photosynthetic physiology and ecology
• Ocean optics and satellite remote sensing of phytoplankton biomass and primary production
• Effects of UV-B on marine microorganisms
• Commercialization of algae biofuels

Honors and Awards:

• Nominee for Provosoli Award, Journal of Phycology: “C.D. Hewes, B.G. Mitchell, T.A. Moisan, M. Vernet and F.M.H. Reid, 1998; The phycobilin signatures of chloroplasts from three dinoflagellate species: a microanalytical study of Dinophysis caudate, D. fortii and D. acuminata, 34(6): 945-951.”
• Award of Excellence, International Seaweed Symposium, 2001: “M.H. Graham & B.G. Mitchell, Obtaining absorption spectra from individual macroalgal spores using microphotometry, Hydrobiologia, 398/399: 231-239, 1999.”
• Co-author and Research Advisor for Outstanding Student Poster Award: “A Comparison of Variable Fluorescence as Measured by a Fast Repetition Rate Fluorometer and a Pulse Amplitude Modulated Fluorometer; Jessica K. Nolan, Elizabeth R. Frame, and B. Greg Mitchell. Presented at the Ocean Sciences Meeting, Honolulu, HI, February 2002.”

Mentoring:

• Shang, Frank (Graduate; 2009-2009)
• Bonsall, Christina (Undergrad; 2008-2008)
• Busby, Kayla (Undergrad; 2008-2008)
• Cheng, Chun Fang (Graduate; 2008-2009)
• Chung-Kai, Sun (Graduate; 2008-2008)
• Hornug, Aaron (Undergrad; 2008-2008)
• Pearson, Brian (Undergrad; 2008-2008)
• Rhodes, Jamie (Post Doc; 2008-2009)
• Yee, Daniel (Undergrad; 2008-2008)
• Yee, Daniel (Masters; 2008-2009)
• DiVittorio, Sara (Undergrad; 2007-2007)
• Neal, Benjamin (Graduate; 2007-2010)
• Zaneveld, Eric (Undergrad; 2007-2007)
• Cape, Mattias (Undergrad; 2006-2008)
• Root, Lindsay (Undergrad; 2006-2006)
• Klimochkin, Alex (Undergrad; 2005-2006)
• Delaney, Nigel (Undergrad; 2004-2005)
• Reynolds, Rick (Post Doc; 2004-2004)
• Giles, Alma (Post Doc; 2003-2005)
• Wang, Haili (Post Doc; 2003-2008)
• Allison, Jennifer (Masters; 2001-2005)
• Chen, Xi (Masters; 1997-1999)
• Frame, Elizabeth (Graduate; 1997-2004)
• Nolan, Jessica (Graduate; 1997-2003)
• Moisan, Tiffany (Graduate; 1994-1999)

Cetacean Biomass, Prey Consumption, and Primary Production Requirements in the California Current Ecosystem. Marine Ecology Progress Series. [Barlow, J., Kahru, M., Mitchell, B. G.] ACCEPTED

Control of phytoplankton biomass by dilution and mixed layer depth in the western Weddell-Scotia Confluence (WSC), Marine Ecology Progress Series. [Hewes, C. D., Reiss, C.S., .Kahru, M., Mitchell, B.G., and Holm-Hansen, O.] 2007. ACCEPTED

Sea level anomalies control phytoplankton biomass in the Costa Rica Dome area. Geophysical Research letters, Vol. 34, L22601, doi:10.1029/2007gl031631. [Kahru, M., Fiedler, P. C., Gille, S. T., Manzano, M., & Mitchell, B. G.] 2007.

Iron limitation Across Chlorophyll Gradients in the Southern Drake Passage: Phytoplankton Responses to Iron Addition and Photosynthetic Indicators of Iron Stress. Limnology and Oceanography, 52(6), 2007, 2540-2554 [Hopkinson, B., Mitchell, B. G., Reynolds, R. A., Wang, H., Selph, K., Measures, C., Hewes, C., Holm-Hansen, O., Barbeau, K.] 2007.

Eddies enhance biological production in the Weddell-Scotia confluence of the southern ocean. Geophysical Research Letters, Vol. 34, L14603, doi:10.1029/2007gl030430 [Kahru, M., Mitchell, B. G., Gille, S. T., Hewes, C. D., and Holm-Hansen, O.] 2007.

Photosynthetic maximum quantum yield increases are an essential component of the Southern Ocean phytoplankton response to iron. PNAS, 105 (12) 4775-4780. [Hiscock, M., Lance, V., Apprill, A., Bidagare, R., Johnson, Z., Mitchell, B., Smith, W., and Barber, R.] 2007.

Biological structure and seasonality Article in the Japan-East Sea. Oceanography, 19 (3) 122-133. [Ashjian, C., Arnone, R., Davis, C., Jones, B., Kahru, M., Lee, C., and Mitchell, B.] 2007.

Validation of ADEOS-II GLI ocean color products using in-situ observations. Journal of Oceanography, 62 3, 373-393. [Murakami, H., Sasaoka, K., Hosoda, K., Fukushima, H., Toratani, M., Frouin, R., Mitchell, B. G., Kahru, M., Deschamps, P. Y., Clark, D., Flora, S., Kishino, M., Saitoh, S., Asanuma, I., Tanaka, A., Sasaki, H., Yokouchi, K., Kiyomoto, Y., Saito, H., Dupouy, C., Siripong, A., Matsumura, S., and Ishizaka, J.] 2006.

Climate effect on food supply to depths greater than 4000 meters in the northeast Pacific. Limnology and Oceanography, 51(1): 166-176, 2006. [K. L. Smith, K.L. Jr., R.J. Baldwin, H.A. Ruhl, M. Kahru, B.G. Mitchell, and R.S. Kaufmann]. 2006

Efecto de los vientos Santa Ana en las propiedades bio-ópticas frente a Baja California (Effect of Santa Ana winds on bio-optical properties off Baja California). Ciencias Marinas (2005), 31(2): 339–348 [Ramón Sosa-Ávalos, Gilberto Gaxiola-Castro, Reginaldo Durazo, B. Greg Mitchell]. 2005

Assessment of the ultraviolet radiation field in ocean waters from space-based measurements and full radiative-transfer calculations. Applied Optics 44: 2863-2869. [A. P. Vasilkov , J. R. Herman, Z. Ahmad, M. Kahru, and B. G. Mitchell]. 2005

Ocean-color variability in the Gulf of California: scales from days to ENSO. Deep-Sea Research Part II-Topical Studies in Oceanography 51: 139-146. [M. Kahru, S. G. Marinone, S. E. Lluch-Cota, A. Pares-Sierra, and B. G. Mitchell. 2004

Performance of the MODIS semi-analytical ocean color algorithm for chlorophyll-a. Climate Change Processes in the Stratosphere, Earth-Atmosphere-Ocean Systems, and Oceanographic Processes from Satellite Data 33 : 1152-1159, 2004. [K. L. Carder, F. R. Chen, J. P. Cannizzaro, J. W. Campbell, and B. G. Mitchell] 2004

Phytoplankton absorption, photosynthetic parameters, and primary production off Baja California: summer and autumn 1998. Deep-Sea Research Part II-Topical Studies in Oceanography 51: 799-816, [E. Aguirre-Hernandez, G. Gaxiola-Castro, S. Najera-Martinez, T. Baumgartner, M. Kahru, and B. G. Mitchell] 2004

Temporal and spatial distribution of chlorophyll-a in surface waters of the Scotia Sea as determined by both shipboard measurements and satellite data. Deep-Sea Research Part II-Topical Studies in Oceanography 51: 1323-1331. [O. Holm-Hansen, M. Kahru, C. D. Hewes, S. Kawaguchi, T. Kameda, V. A. Sushin, I. Krasovski, J. Priddle, R. Korb, R. P. Hewitt, and B. G. Mitchell]. 2004

MODIS Detects a Devastating Algal Bloom in Paracas Bay, Peru. EOS, Trans. AGU, Vol. 85 (45), p. 465-472. [M. Kahru, B.G. Mitchell, A. Diaz, M. Miura]. 2004

Influence of submicron absorptive aerosol on sea-viewing wide field-of-view sensor (SeaWiFS)-derived marine reflectance during Aerosol Characterization Experiment (ACE)-Asia. Journal of Geophysical Research-Atmospheres 108(D15): 4472, doi:10.1029/2002JD002776. [L.P. Li, H. Fukushima, R. Frouin, B. G. Mitchell, M.X. He, I. Uno , T. Takamura, and S. Ohta]. 2003

Two models for absorption by coloured dissolved organic matter (CDOM). Oceanologia, Vol. 44 (2), p. 209-241. [Schwarz, J.N., P. Kowalczuk, S. Kaczmarek, G.F. Cota, B.G. Mitchell, M. Kahru, F.P. Chavez, A. Cunningham, D. McKee, P. Gege, M. Kishino, D.A. Phinney, R. Raine] 2002

Problems in assessment of the UV penetration into natural waters from space-based measurements. Optical Engineering 41 : 3019-3027. [Alexander P. Vassilkov, Jay R. Herman, Nickolay A. Krotkov, Mati Kahru, B. Greg Mitchell, and Christina Hsu]. 2002

Influence of the El Niño – La Niña cycle on satellite-derived primary production in the California Current. Geophysical Research Letters. 29(17), doi: 10.1029/2002GL014963. [Mati Kahru and B. Greg Mitchell]. 2002

UV absorption by mycosporine-like amino acids in Phaeocystis Antarctica Karsten induced by photosynthetically available radiation. Marine Biology, 138: 217-227. [T.A. Moisan and B.G. Mitchell]. 2001

Comparison of the ocean inherent optical properties obtained from measurements and inverse modeling. Applied Optics, 40(15): 2384-2397. [H. Loisel, D. Stramski, B.G. Mitchell, F. Fell, V. Fournier-Sicre, B. Lemasle and M. Babin]. 2001

Seasonal and nonseasonal variability of satellite-derived chlorophyll and colored dissolved organic matter concentration in the California Current. Journal of Geophysical Research, 106(C2): 2517-2529. [M. Kahru and B.G. Mitchell]. 2001

A chlorophyll-dependent semianalytical reflectance model derived from field measurements of absorption and backscattering coefficients within the Southern Ocean. Journal of Geophysical Research, 106(C4): 7125-7138. [R.A. Reynolds, D. Stramski and B.G. Mitchell]. 2001

Estimation of the absorption and backscattering coefficients from in-water radiometric measurements. Limnology & Oceanography 45(3): 628-641. [M. Stramska, D. Stramski, B.G. Mitchell and C.D. Mobley]. 2000

Influence of the 1997-98 El Niño on the surface chlorophyll in the California Current. Geophysical Research Letters, 27(18): 2937-2940. [M. Kahru and B.G. Mitchell]. 2000

Artificial neural networks for modeling the transfer function between marine reflectance and phytoplankton pigment concentration. Journal of Geophysical Research, 105(C2): 3,483-3,495. [L. Gross, S. Thiria, R. Frouin and B.G. Mitchell]. 2000

Ocean color algorithms for estimating water clarity (Seechi Depth) from SeaWiFS. Journal of Advanced Marine Science and Technology Society, 301-306. [K.S. Prasad, R.L. Bernstein, M. Kahru and B.G. Mitchell]. 2000

Study of A Recurring Anticyclonic Eddy Off The Northeast Korean Coast Using Satellite Ocean Color and Sea Surface Temperature Imagery. Journal of Advanced Marine Science and Technology Society, 275-280. [Y.S. Suh, S.D Hahn, Y.Q. Kang and B.G. Mitchell]. 2000 Empirical chlorophyll algorithm and preliminary SeaWiFS validation for the California Current. International Journal of Remote Sensing, 20(17): 3423-3429. [M. Kahru and B.G. Mitchell]. 1999

Obtaining absorption spectra from individual macroalgal spores using microphotometry. Hydrobiologia, 398-399: 231-239 [M.H. Graham and B.G. Mitchell] 1999

Estimation of particulate organic carbon in the ocean from satellite remote sensing. Science, 285: 239-242. [D. Stramski, R.A. Reynolds, M. Kahru and B.G. Mitchell] 1999

Early phase analysis of OCTS radiance data for aerosol remote sensing. IEEE Transactions on Geoscience and Remote Sensing, 37(3): 1,575-1,585. [T. Nakajima, A. Higurashi, K. Aoki, T. Endoh, H. Fukushima, M. Toratani, Y. Mitomi, B. G. Mitchell, and R. Frouin] 1999

Photophysiological acclimation of Phaeocystis antarctica Karsten under Light Limitation. Limnology and Oceanography, 44(2): 247-258. [T.A. Moisan and B.G. Mitchell] 1999

Ocean Color Chlorophyll Algorithms for SeaWiFS. Journal of Geophysical Research, 103(C11): 24,937-24,953. [J.E. O'Reilly, S. Maritorena, B.G. Mitchell, D.A. Siegel, K.L. Carder, S.A. Garver, M. Kahru, C. McClain] 1998

Xanthophyll cycling in Phaeocystis: Changes in cellular fluorescence. Marine Ecology Progress Series, 169: 113-121. [T.A. Moisan, M. Olaizola and B.G. Mitchell] 1998

Spectral reflectance and absorption of a massive red tide off Southern California. Journal of Geophysical Research, 103(C10): 21,601-21,609. [M. Kahru and B.G. Mitchell] 1998

The phycobilin signatures of chloroplasts from three dinoflagellate species: a microanalytical study of Dinophysis caudata, D. fortii and D. acuminata [Dinophysiales Dinophyceae]. Journal of Phycology, 34(6): 945-951. [C.D. Hewes, B.G. Mitchell, T.A. Moisan, M. Vernet and F.M.H. Reid] 1998

Algorithms for SeaWiFS standard products developed with the CalCOFI bio-opticaldata set. CalCOFI Reports, Vol. 39, 133-147, Oct., 1998. [B.G. Mitchell and M. Kahru] 1998

Photosynthetic Parameters of Phytoplankton in the California Current System. CalCOFI Reports Vol. 39, 148-158, Oct., 1998. [J.E. Valdez-Holguín, S. Alvarez- Borrego and B.G. Mitchell] 1998