Ocean Sciences Program (OS and PS)

There will be an ocean sciences program at the General Assembly in Boulder. Although IAPSO has announced intentions to hold a separate meeting from the General Assembly of the IUGG, the program committee has an obligation to provide an appropriate scientific program for those oceanographers who have planned to attend the XXI General Assembly.

Session designated "PS" in this program will be held as originally planned and advertised; abstracts and programming will be handled by the conveners listed in this circular. Sessions designated "OS" may have modified scopes depending on the abstracts received. Abstracts and programming will be handled by Christopher N. K. Mooers, the Ocean Sciences Program Committee representative. For questions and abstract submission, you may reach him at the University of Miami, RSMAS/AMP, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, Miami, FL 33149 (USA); tel: 1-305-361-4825; fax: 1-305-361-4797; e-mail: cmooers@rsmas.miami.edu.

G JS3 Earth Rotation_An Interdisciplinary Approach To Earth System Science (IAG, IAMAS, OCEANS, IASPEI, IAGA, IAHS, SEDI)

The modern approach to understanding Earth rotation irregularities deals with interacting physical constituents as diverse as a liquid, magnetic core, a visco-elastic mantle, and liquid and gaseous external layers, each with internal motions and responding to external forces. The global character of the observational evidence is a major challenge to theoreticians who develop dynamical models of the behavior of each layer. No single theory can explain the complete set of observed irregularities. The monitoring of Earth rotation itself includes the participation of worldwide space geodetic and astronomical programs, leading to intensive international cooperation. The symposium will focus on those aspects of Earth rotation studies that imply, or even create, bridges between scientific disciplines. Lead Convener: M. Feissel (IAG), Observatoire de Paris, Central Bureau, International Earth Rotation Service, 61, Avenue d'Observatoire, F-75014 Paris (FRANCE); tel: +33-1-4051-2226; fax: +33-1-40-51-22-91; e-mail: feissel@obspm.fr. Co-conveners: D. Cartwright (UK), R. Hide (UK), R. Sabadini (ITALY), J. Wahr (USA), P. Brosche (GERMANY).

M JS6: Atmospheric C02 and 02: The Breathing of the Earth (IAMAS, IAVCEI, OCEANS)

The terrestrial biosphere plays an important role in atmospheric CO2 variations on seasonal and interannual timescales. The purpose of this symposium is to provide a forum for scientists from different disciplines to bring together their different approaches to the problem area of biosphere-atmosphere interaction and how that is affected by global change. The main focus will be to define concrete ways to better assess the role of the terrestrial biosphere in the global carbon cycle. Lead Convener: Ingeborg Levin, Institut fur Umweltphysik, Universitat Heidelberg, Im Neuenheimer Feld 366, D-69120, Heidelberg, Germany; tel: +49-221-56-3330; fax: +49-221-56-3405. Co-conveners: P. Tans, D. Schimel

M JS14: Climatic Variability and Forcing over the Past Millennium (IAMAS, IASPEI, IAVCEI, OCEANS)

This joint symposium invites presentations describing the climate of the past millennium, including its natural variations and changes induced by natural forcing and by human activities. The symposium will cover the means and techniques for reconstruction of the climate and climate forcings over this period, the spatial and temporal patterns of the climate and its variations, the explanations for and causes of these variations, the extent to which natural and human influences can be distinguished over the past two centuries, and the implications of these findings for distinguishing anthropogenic and natural changes in climate in the future. Session themes are planned to include: methods for reconstructing climate, high-resolution records of volcanism and other forcing factors, the Medieval Climate Optimum, the Little Ice Age, the Industrial Period, and the implications of past climate relationships for the future climate. Lead Convener: Michael MacCracken, Office of the U.S. Global Change Research Project, c/o National Science Foundation 300 D Street, S.W., Suite 840, Washington, DC 20024 (USA); tel: 1- 202-651-8250; fax: 1-202-554-6715, e-mail: mmaccracken@usgcrp.gov. Co-conveners: C. Folland (UK), P. D. Jones (UK), H. Pollack (USA), A. Robock (USA), S. Self (USA), G. Zielinski (USA), U. Mikolajewicz (GERMANY).

PS JS2 Sea Level and Ice-Sheet Volume Changes As Geophysical Indicators (OCEANS, IAG, IAHS)

Sea level variations occur across a wide spectrum of space and time scales: from global to local and from millions of years to minutes. This session will highlight the wide range of geophysical causes, and the implications of sea level changes. It will also emphasize how many of them are interrelated. Lead Convener: David T. Pugh, Institute of Oceanographic Sciences, Deacon Laboratory, Brook Road Wormley, Godalming, Surrey, GU8 5UB (UK); tel: +44-428-684141; fax: +44-428-685637/683066; telex: 858833 OCEANS G; Omnet: D.PUGH; e-mail: dtp@uk.ac.nwo.ua. Co-conveners: Suzanna Zerbini (Italy), Mark F. Meier (USA).

PS JS3: Internal Waves and Small-Scale Turbulence in Oceans, Lakes, and Atmosphere (OCEANS, IAMAS)

This symposium has as its goal the examination of similarities and differences between oceans, lakes and the atmosphere with regard to the structure of small-scale turbulence and internal waves, and with regard to how turbulence and internal waves interact with large-scale dynamics in the three different environments. Modelling/theoretical papers that assess the importance of these interactions of small-scale processes with the large-scale flow will be encouraged. Lead Convener: Michael C. Gregg, Applied Physics Laboratory and School of Oceanography, University of Washington, 1013 N. E. 40th Street, Seattle, WA 98195 (USA); tel: 1-206-543-1353; fax: 1-206-543-6785; telex: 910.444.1345; Omnet: M.GREGG; e-mail: gregg@apl.washington.edu. Co-convener: Thomas E. Van Zandt (USA).

PS JS4: Tsunami Disaster Reduction (OCEANS, IASPEI)

This symposium, which is also the Tsunami Commission's 17th International Tsunami Symposim, will focus on research that leads to disaster reduction. The themes of the symposium are (1) historical and contemporary observations of tsunamis; (2) physical processes of tsunami evolution; and (3) hazard reduction through assessment techniques and warning systems. All interested scientists are invited to contribute. Lead Convener: Eddie N. Bernard, Director, Pacific Marine Environment Laboratory, NOAA/PMEL Bin C 15700 - Bldg. 3, 7600 Sand Point Way NE, Seattle, WA 98115-0070 (USA); tel: 1-206-526-6800; fax: 1-206-526-6815;
e-mail: bernard@pmel.noaa.gov. Co-conveners: Gerassimos A. Papadopoulos (GREECE), Nobuo Shuto (JAPAN), Stefano Tinti (ITALY).

S JS3: Long-Term Seafloor Observations and Networks (IASPEI, IAG, IAGA, OCEANS, ION)

The observation network of global processes is currently nonuniform and undersampled. Establishing long-term seafloor stations to cover 70% of the Earth's surface, hosting most of the active plate boundaries and hot spots, is the key to bringing about a breakthrough in understanding the dynamic Earth. Careful planning and experiments, taking an interdisciplinary approach through international coordination utilizing available resources such as ODP drilled holes and submarine cables, could accelerate such efforts. Scientific objectives and the technological feasibility of establishing deep sea floor stations to observe geophysical or geochemical parameters ranging from ocean to core processes are to be discussed in light of experimental and theoretical studies. Lead Convener: K. Suyehiro, Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164 (JAPAN); tel: +81-3-5351-6439; fax: +81-3-5351-6438; e-mail: suyehiro@trout.ori.u-tokyo.ac.jp. Co-conveners: J.-P. Montagner (FRANCE), J. Orcutt (USA), A. Chave (USA), A. Schultz (UK), F. Spiess (USA).

PS 3: Circulation of Marginal Seas and Semi-Enclosed Seas

This symposium will address the general and transient circulation of marginal and semi-enclosed seas, including the interaction of these seas with regional meteorological and hydrological processes. Physical and chemical aspects of this topic will be treated. Observational and modeling issues will be covered, especially those peculiar to such seas. A global overview of these seas will be achieved through comparisons and elucidation of similarities and differences. The following areas will be covered: "The Intra-Americas Sea" (G. Maul), "The Mediterranean Sea" (P. Malanotte-Rizzoli, N. Pinardi), "N. W. European Seas" (J. Huthnance), "East Asian Marginal Seas" (M. Takematsu, P. Hsueh, G. I. Yurasov, L. Ye), and "Other Related Sea" (D. A. Brooks). Lead Convener: Christopher N. K. Mooers, Ocean Pollution Research Center, RSMAS /MSC 132, 4600 Rickenbacker Causeway, Miami, FL 33149 (USA); tel: 1-305-361-4825; fax: 1-305-361-4797; Omnet: C.MOOERS; e-mail: cmooers@rsmas.miami.edu. Co-conveners: George A. Maul (USA), Paola Malanotte-Rizzoli (USA), Nadia Pinardi (ITALY), John M. Huthnance (UK), Masaki Takematsu (JAPAN), Ya Hsueh (USA), Gennady I. Yurasov (RUSSIA), Longfei Ye (CHINA), David A. Brooks (USA).

PS W3: Understanding Ocean Physics Using Laboratory, Numerical, and Theoretical Modeling

The purpose of this workshop is to bring together researchers who are interested in understanding ocean physics using laboratory experiments, numerical modelling, and theoretical analysis, and to discuss the state of the art.

Ocean Sciences Symposia

The following symposia will be organized in Boulder. Conveners have not been chosen but Christopher N. K. Mooers has been appointed by the President of IUGG, Helmut Moritz, to organize these sessions with conveners to be selected later. All abstracts for these symposia should be sent directly to the Assembly organizers: American Geophysical Union, 2000 Florida Avenue, N.W., Washington, DC 20009. A copy of each abstract should also be sent to C. N. K. Mooers, RSMAS, Ocean Pollution Research Center, MSC 132, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149 (USA); tel: 1-305-361-4825; fax: 1-305-361-4797; e-mail: cmooers@rsmas.miami.edu. Abstracts on any aspect of physical, chemical, geological, or biological oceanography are also encouraged. These will be organized into symposia which reflect the subject matter of the abstracts received.

OS 1: Large-Scale Ocean Circulation

This symposium will present new results (observational, modeling, theoretical), that diagnose the present-era, large-scale circulation of the world ocean, and transports of mass, heat, and the substances of the ocean. In particular, the symposium will include early results of the international WOCE relevant to these topics. Sections will be organized as follows: "Direct measurements of the global conveyor," "The great trans-ocean sections," "The new Lagrangian data-set," "Circulation of polar and sub-polar seas" (E. Fahrbach), and, "oceanic subduction" (T. Joyce).

OS 2: Decadal and Interdecadal Variations in the Ocean

This symposium will address decadal and interdecadal variations in the oceans, large-scale ocean-atmosphere intereactions on these time scales, and their implications of/for climate and climate change.

OS 4: Coastal Ocean (A) Interaction With the Open Ocean

This symposium will address circulation and processes in the coastal oceans, especially those that have connections and/or interactions with the open ocean. Topics to be covered include boundary currents (both inertia and buoyancy driven), cross-shelf transport, shelf break fronts, scattering of coastal trapped waves, and internal waves and tides.

OS 5: Coastal Ocean (B) Interaction With the Adjacent Land

This symposium will focus on circulations and processes in the coastal oceans, especially those having connections or interactions with the land. Problems of estuaries, studies of natural hazards in the coastal zone, and presentations on the mitigation of these hazards will be included.

OS 6: Carbon Dioxide in the Oceans

This symposium will focus on processes that influence the distribution and flux of CO2 in the oceans, including those phenomena that affect the extent of oceanic/atmospheric exchange of CO2. The current measurement strategies will be assessed, and the likely role of current and future satellite observations in estimating the uptake of fossil fuel CO2 by the ocean. Particular emphasis will be placed on data syntheses and on modeling presentations that incorporate results from the many recent national and international programs to measure the components of the CO2 system in the ocean: e. g., measurements of _P(CO2) made along ship tracks by many nations, measurements made at the JGOFS time series stations or during the various JGOFS process studies, and the CO2 measurements made on oceanographic sections; such as those of the WOCE Hydrographic Program.

OS 7: Air-Sea-Ice Interactions and High-Latitude Ocean Processes

This symposium will consider many of the complex physical processes that arise in oceans with ice cover. Subjects include mechanisms of air-sea-ice interactions, brine-driven convection, maintenance of polar pycnoclines, fluxes across these pycnoclines, structure and properties of sea ice, sea ice dynamics, growth and decay, and the role of marginal ice zones on sea level.

OS 8: Dynamics of the Open Ocean From New Satellites (IAG)

This symposium will address recent results in the analysis of open-ocean dynamics as determined from spaceborne sensors, either unaided or in conjunction with conventional measurements. Particular interest will be in the observations from recently launched satellites such as TOPEX/Poseidon, and ERS-1. Fields of interest include wind driven dynamics (e. g. equatorial wave dynamics, mixed layer variability), sea-surface topography for large-scale circulation studies, open ocean tides, and surface waves.

OS 9: Marine Dispersion

This symposium will address those characteristics of turbulent fluids that promote dispersion, both absolute with respect to a fixed point, and relative to the center of mass of the tracer. The rate of relative dispersion is scale-dependent, being subject to the processes leading to separation of fluid particles. At small scales, processes such as breaking internal waves, may lead to diapycnal transport, while at mesoscales the stability of eddies may determine the development and structure of biological communities. The rates of dispersion depend on the characteristics of the dispersed material, e. g., whether it is soluble or particulate, neutrally buoyant, or confined to a surface of constant pressure.

OS 10: Spatial Structure of Short Ocean Waves

This symposium will make an interdisciplinary assessment of recent advances in the study of short surface waves (short-gravity to capillary band) and of their implications for electromagnetic backscatter. Emphases will include (1) new experimental results from the laboratory and the field, (2) theoretical results on short waves, nonlinear wave-wave interactions, interaction of waves with turbulent flow in the wave-influenced layer, and wave generation and dissipation, and (3) implications of these findings for remote sensing of wavy surfaces using electromagnetic backscatter.

OS 11: Physical, Chemical, and Geological Oceanography; Poster/Precis Sessions

This symposium will cover a wide range of topics such as (1) ocean motions and properties; (2) chemical distributions and interaction; (3) geological structures and their interactions with the ocean; (4) the formation and movements of ice, waves, tides, sealevel and storm surges, and; (5) new instrumentation and techniques for the study of the oceans.

OS JS1 Ocean-Atmosphere Coupling TOGA/COARE (OCEANS, IAMAS, IAHS)

This symposium will communicate results of recent observational and modeling efforts to understand the continuum of air-sea interactions that take place in the Western Pacific warm pool, from microscale turbulent fluxes of heat, moisture, and momentum across the interface to the mesoscale and synoptic-scale motions in the ocean and atmosphere that modulate these fluxes. Timescales of interest range from a few minutes to a few years, with emphasis on nonstationary processes. A particular objective is to address issues of scale interactions, with the intent to improve parameterizations of subgrid-scale processes in coupled ocean-atmosphere models. Emphasis will be on results derived from TOGA/COARE. However, selected papers of different origin, but addressing air-sea interaction processes of importance in TOGA/COARE, will be included.

OS W1: Present and Future Oceanographic Research in Developing Countries

This workshop will address recent developments in ocean sciences in developing countries. Contributions based on observational data aimed at identifying the linkage between the unique physical, chemical oceanographic processes and biological features, having particular importance to the waters between 30N and 30S will be encouraged.

OS W2 Fossil Turbulence: Microstructure and Hydropaleontology

Microstructure and hydropaleontology, i.e., the use of information preserved by fossil turbulence remnants to understand the properties of the turbulence and mixing that produced them, is the topic of this workshop.

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IUGG XXI General Assembly