Bibliography - R. Hallberg

1. Gnanadesikan, A., K. A. Emanuel, Gabriel A. Vecchi, Whit G. Anderson, and R. Hallberg, July 2010: How Ocean color can steer Pacific tropical cyclones. Geophysical Research Letters, (InPress),
   [ Abstract ]

   Because ocean color alters the absorption of sunlight, it can produce changes in sea surface temperatures with further impacts on atmospheric circulation. These changes can project onto fields previously recognized to alter the distribution of tropical cyclones. If the North Pacific subtropical gyre contained no absorbing and scattering materials, the result would be to reduce subtropical cyclone activity in the subtropical Northwest Pacific by 2/3, while concentrating cyclone tracks along the equator. Predicting tropical cyclone activity using coupled models may thus require consideration of the details of how heat moves into the upper thermocline as well as biogeochemical cycling.

2. Kunkel, C., R. Hallberg, and Michael Oppenheimer, 2006: Coral Reefs Reduce Tsunami Impact in Model Simulations. Geophysical Research Letters, 33(L23612), doi:10.1029/2006GL027892
   [ Abstract ]

   Significant buffering of the impact of tsunamis by coral reefs is suggested by limited observations and some anecdotal reports, particularly following the 2004 Indian Ocean tsunami. Here we simulate tsunami run-up on idealized topographies in one and two dimensions using a nonlinear shallow water model and show that a sufficiently wide barrier reef within a meter or two of the surface reduces run-up on land on the order of 50%. We studied topographies representative of volcanic islands (islands with no continental shelf) but our conclusions may pertain to other topographies. Effectiveness depends on the amplitude and wavelength of the incident tsunami, as well as the geometry and health of the reef and the offshore distance of the reef. Reducing the threat to reefs from anthropogenic nutrients, sedimentation, fishing practices, channelbuilding, and global warming would help to protect some islands against tsunamis.

Direct link to page: http://cmi.princeton.edu/bibliography/results.php?author=3896