SS37 Linking Dynamic Temporal Processes with Spatial Domains (Spatial and Temporal Connections)
Date: Tuesday, February 13, 2001, Time: 2:00:00 PM
Location: San Miguel
 
Zimmerman, R, C, Moss Landing Marine Laboratories, Moss Landing, CA 95039, USA, rzimmer197@aol.com
Buddemeier, R, W, Kansas Geological Survey, University of Kansas, Lawrence, KS 66047, USA,
 
LINKING DYNAMIC TEMPORAL PROCESSES WITH SPATIAL DOMAINS IN ECOSYSTEM STUDIES
 
Dynamic process emphasize the mechanisms of ecosystem function often without regard for the spatial distribution of the process in question while spatial studies often fail to incorporate important temporal dynamics adequately. This session focuses on the integration of these approaches to achieve greater understanding of the dynamics and control of ecosystem function. Problems to overcome in successfully merging these different approaches include issues of scale, resolution and complexity, and the integration of physical, chemical, biotic, and anthropogenic efforts. Presentations will consider several aspects of this issue with regard to data density, parameter uncertainty and reliability of the resulting predictions and analyses.
 
 Powerpoint presentation page -- Special session overview/tutorial: issues plus examples from talks
 
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SS01 Submerged Aquatic Vegetation and the Water Column (Environmental Connections)
Date: Tuesday, February 13, 2001, Time: 10:30:00 AM
Location: Galisteo
 
Zimmerman, R, C, Moss Landing Marine Laboratories, Moss Landing, CA 95039, USA, rzimmer197@aol.com
Buddemeier, R, W, Kansas Geological Survey, University of Kansas, Lawrence, KS 66047, USA,
 
THE COST OF GOING WITH THE FLOW: IMPACT OF CURRENT VELOCITY ON SEAGRASS CANOPY PHOTOSYNTHESIS
 
Water motion enhances seagrass productivity by increasing the delivery of dissolved substances to the leaf surface. But coherent currents also collapse the vertical biomass distribution of the seagrass canopies and increase the leaf area projected toward the incoming light. The increased projected leaf area increases light attenuation in the upper layers of the canopy, but reduces radiative transfer to the lower portion of the canopy where most of the biomass resides. Consequently, total canopy photosynthesis decreases as leaf tissue in the upper illuminated portion of the canopy cannot utilize all the absorbed photons for photosynthesis, even though lower regions of the canopy are increasingly light limited. Current velocities of 20 cm per sec may reduce canopy photosynthesis by as little as 10 percent in clear shallow waters. In turbid water, however, canopy photosynthesis may be reduced by as much as 50%, which can enough to limit seagrass density and depth distribution in certain environments.
 
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SS37 Linking Dynamic Temporal Processes with Spatial Domains (Spatial and Temporal Connections)
Date: Tuesday, February 13, 2001, Time: 2:45:00 PM
Location: San Miguel
 
Buddemeier, R, W, Univ. of Kansas, Lawrence, USA, buddrw@ukans.edu
 
GLOBALIZATION OF COASTAL ZONE FUNCTION ACROSS MULTIPLE SPATIO-TEMPORAL SCALES
 
The LOICZ project is assessing the role of the coastal zone (CZ) in global fluxes of C, N, and P by linking, integrating and extrapolating scattered datasets at scales of 1-1000 km. Global trends must be identified from combinations of data sets with both natural and human-induced variablilty at scales from subannual to millennial. The approach combines standardized, comparable compilation of available CZ biogeochemical budgets with determination of systematic relationships to environmental variables. Globally available datasets in a gridded coastal database are used to generate a coastal typology (multidimensional similarity classification) by clustering. The method is simple, robust, and applicable over a wide range of data types, spatio-temporal resolutions, and environmental conditions. It can be refined by sub-grid scale parameterization, addition of variables, and/or use of nested high-resolution studies for calibration. Time-dependent information can be stored within the grid-cell database structure or used to generate successive scenario 'snapshots' for change analysis and identification of opportunities for space-for-time tradeoff analysis. The developmental emphasis is on versatility, flexibility, and broad applicability to the exploration of multiscale spatio-temporal relationships.

Powerpoint presentation page

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SS37 Linking Dynamic Temporal Processes with Spatial Domains (Spatial and Temporal Connections)
Date: Tuesday, February 13, 2001, Time: 3:00:00 PM
Location: San Miguel
 
Bartley, J, D, Kansas Geological Survey, University of Kansas, Lawrence, USA, jbartley@kgs.ukans.edu
Buddemeier, R, W, Kansas Geological Survey, Lawrence, USA, buddrw@kgs.ukans.edu
 
A MUTIPLE SCALE ANALYSIS OF SPATIAL AND TEMPORAL PATTERNS OCCURING IN THE COASTAL ZONE USING GEOGRAPHIC INFORMATION SYSTEMS
 
We present a methodology that uses Geographic Information Systems (GIS) and statistical clustering techniques for comparing data across multiple spatial and temporal scales. For the coastal zone of the Australian region, we explored the functional response of available biogeochemical budgets to globally available environmental variables. We compared environmental variables aggregated at 30' resolution with local CNP budgets representing coastal systems of various sizes. The role of intra-annual variability in characterizing types of CNP budgets is explored by clustering experiments comparing the results of analyses using only average values with those including information on the range and variance of the variable data. This provides a means of incorporating some key aspects of temporal variation in an analysis based largely on static or averaged data.

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PC08 New Techniques and Technologies from Single Cells to the Global Ocean
Date: Wednesday, February 14, 2001
Location: Southwest Hall
 
McLaughlin, C, J, Kansas Geol. Survey, University of Kansas, Lawrence, USA, cjm@ukans.edu
 
UTILIZING GIS TO RELATE SPATIAL AND TEMPORAL DYNAMICS OF THE EMERGENT EAST ASIAN COAST
 
The natural sedimentation rates and geomorphology of the Yellow (Huang He) River are well documented; these have not been related across time and space in a GIS and existing models fail to address human influences. The Yellow River, for example, no longer flows into the ocean for a large portion of the year due to increased water consumption by industry, agriculture, and a growing population in the last 20 to 30 years. The Yellow River delta's shift from rapid accretion (fueled by its traditionally large sediment load) to coastal erosion is a dramatic shift in the development of coastal morphology with profound societal repercussions. Historical maps and remotely sensed data will be used to create a GIS model to determine impacts of river change on the East Asian coastline using a multi-scale approach. Historical maps create a long record of spatial change, but with only a few temporal intervals. Satellite images, however, construct a scale with a short temporal record (30 years), but provide a high degree of precision within those confines both temporally and spatially.