ALBERT J. HERMANN PMEL / JISAO

Overview of Recent Work 

I work with other physical oceanographers and biologists on models of circulation, plankton and fish dynamics in the Gulf of Alaska and the Bering Sea, as part of the Fisheries Oceanography Coordinated Investigations (FOCI), the Southeast Bering Sea Carrying Capacity (SEBSCC) program, the Northeast Pacific GLOBEC program, and a new Sea Lion initiative. Other recent work centers on low-cost stereo virtual reality techniques. 

Here are some web pages which summarize our work: 

• A general overview of our biophysical models 
• Modeling efforts for the wider Coastal Gulf of Alaska (GLOBEC) (with animations), and a draft of a recent paper describing our findings.
• New nested models in development for the North Pacific, to address GLOBEC, Sea Lion, and Bering Sea issues
• Modeling activities for the Southeastern Bering Sea (SEBSCC) (with animations and virtual reality) ,and a draft of a recent paper describing our findings.
• Modeling results for the Northern Gulf of Alaska (FOCI) (with animations of salinity field), and a recent presentation on eddy statistics
• A presentation on our modeling activities as of September 1999
• A spawning experiment for FOCI using coupled biophysical models (with animations) 
• A paper which describes methods of physical-biological coupling
• An extended abstract describing boundary conditions for a regional model which includes tidal and subtidal flows
• Low-cost stereo virtual reality for oceanography (what you can do with two eyes, a PC, and a few hundred dollars) 

Virtual Reality 

A 4D representation of some of our indiviual-based fish (pollock) model results for various years. The model is centered near Kodiak Island, AK. In the above frame Kodiak Island is on the right and Alaska is to the left; we are looking northeast into Shelikof Strait. These are animated VRML worlds which *should* run on most PC and Mac web browsers (if not try installing the Cortona Viewer). Fish are represented as spheres which move through time, with modeled seafloor bathymetry rendered as a 3D surface. Click on the above frame to open this world. Here also are some representative fish worlds (in black and white)  for   1978 1987 1988 1991 1994

Also check out our animations of salinity fields for these years, which highlight eddies in this region.
 
 

Other Sample Movies

Pollock Movement Click the image to the left to view a quick sample movie of our individual-based biophysical modeling for FOCI. The moving black dots are representative fish (walleye pollock, Theragra chalcogramma), superimposed on the evolving salinity field for 1989 near Kodiak Island, Alaska. We performed these simulations on the CRAY Y-MP at the Arctic Region Supercomputing Center .
Pollock Size Another movie of pollock size for 1987 illustrates positions of fish after hatching, with length of individuals (in mm) coded by color. Note how some fish get entrained in eddy features, which limit their dispersion.

These are short animated gifs. We have experimented with other formats but these are *guaranteed* to run on any web browser
 

Selected Publications

Hermann, A.J., D. B. Haidvogel, E. L. Dobbins, and P. J. Stabeno. 2002. Coupling Global and Regional Circulation Models in the Coastal Gulf of Alaska .   Prog. Oceanog. 53: 335-367.

Hermann, A.J., P. J. Stabeno, D. B. Haidvogel, D. L. Musgrave. 2002. A regional tidal/subtidal circulation model of the southeastern Bering Sea: Development, sensitivity analyses and hindcasting. Deep-Sea Res. II (Topical Studies in Oceanography) 49: 5495-5967.. 

Stabeno, P. J., N. A. Bond, A. J. Hermann, C. W. Mordy and J. E. Overland. 2002. Meteorology and Oceanography of the Northern Gulf of Alaska . Progress in Oceanography (accepted pending revision). 
 

Hermann, A.J., S. Hinckley, B.A Megrey and J.M. Napp. 2001. Applied and theoretical considerations for constructing spatially explicit Individual-Based Models of marine fish early life history which include multiple trophic levels. ICES J. Mar. Sci. 58: 1030-1041. 

Hinckley, S., Hermann, A. J., Meir, K. L. and B. A. Megrey. 2001. The importance of spawning location and timing to successful transport to nursery areas: a simulation modeling study of Gulf of Alaska walleye pollock. ICES J. Mar. Sci. 58:1042-1052. 

Hermann, A. J. and P. J. Stabeno. 1996. An eddy resolving model of circulation on the western Gulf of Alaska shelf. I. Model development and sensitivity analyses. J. Geophys. Res. 101: 1129-1149. 

Stabeno. P. J. and A. J. Hermann. 1996. An eddy resolving model of circulation on the western Gulf of Alaska shelf. II. Comparison of results to oceanic observations. J. Geophys. Res. 101: 1151-1161. 

Hermann, A. J., S. Hinckley, B. A. Megrey and P. J. Stabeno. 1996. Interannual variability of the early life history of walleye pollock near Shelikof Strait, as inferred from a spatially explicit, individual-based model.Fish. Oceanogr. 5 (Suppl. 1): 39-57. 

Hinckley, S., A. J. Hermann and B. A. Megrey. 1996. Development of a spatially explicit, individual-based model of marine fish early life history. Mar. Ecol. Prog. Ser. 139: 47-68. 

Stabeno, P. J., A. J. Hermann, N. A. Bond and S. J. Bograd. 1995. Modeling the possible impact of climate change on the survival of larval walleye pollock (Theragra chalcogramma) in the Gulf of Alaska. Can. Spec. Pub. Fish. Aquat. Sci. 121: 719-727. 

Kemp, W. M., W. R. Boynton and A. J. Hermann. 1995. Simulation models of an estuarine macrophyte ecosystem. In: B. Patten and S. Jorgensen, eds., Complex Ecology: The Part-Whole Relation in Ecosystems, Prentice-Hall. 

Hermann, A. J. and W. B. Owens. 1993. Energetics of gravitational adjustment for mesoscale chimneys. Journal of Physical Oceanography 23: 346-371. 

Hermann, A. J. and H. M. Hsu. 1993. A vertical coordinate mapping technique for semi-spectral primitive equation models of oceanic circulation. Journal of Atmospheric and Oceanic Technology 10: 381-396. 

Hermann, A. J., P. B. Rhines and E. R. Johnson. 1989. Nonlinear Rossby adjustment in a channel: beyond Kelvin waves. J. Fluid Mech. 205:469 - 502. 

Hermann, A. J., B. M. Hickey, M. L. Landry and D. F. Winter. 1989. Coastal Upwelling Dynamics. In: B. M. Hickey and M. R. Landry, eds., Coastal Oceanography of Washington and Oregon, Elsevier Publishers. 

Contact Information

snail mail address:
NOAA/PMEL
7600 Sand Point Way NE, Bldg.3
Seattle, WA, 98115-0070, USA