FRONTIERS OF OCEAN RESEARCH FOR THE 21 ST CENTURY: INTERDISCIPLINARY MULTISCALE GLOBAL COASTAL OCEAN...
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![Page 1: FRONTIERS OF OCEAN RESEARCH FOR THE 21 ST CENTURY: INTERDISCIPLINARY MULTISCALE GLOBAL COASTAL OCEAN Allan R. Robinson Harvard University.](https://reader036.fdocuments.in/reader036/viewer/2022062315/56649d385503460f94a12486/html5/thumbnails/1.jpg)
FRONTIERS OF OCEAN RESEARCH FOR THE 21ST CENTURY:
INTERDISCIPLINARY MULTISCALE GLOBAL COASTAL OCEAN
Allan R. Robinson
Harvard University
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Ocean Science: The 20th Century
• Modern Ocean Science defined as a Scientific Discipline
• Progress in Subdisciplines: Physical, Biological, Chemical, Geological Oceanography etc.
• Interdisciplinary Issues Recognized, but little progress possible
• Emergence of Concept of the Importance of Oceans to Society
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Ocean Science: 21st Century Research Frontiers Now
• Interdisciplinary Ocean Science• Ocean Science as a Complex System Science:
Multiscale Nonlinear Dynamics and Feedbacks• Ocean Science as a Component of Whole Earth
Science - Ocean, Atmosphere, Ice, Solid Earth, Biosphere: Interactions and Integral Processes
• Exploitation of Healthy Oceans to benefit Human population of the Planet Earth
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Interdisciplinary Ocean Science Today
• Research underway on coupled physical, biological, chemical, sedimentological, acoustical, optical processes
• Ocean prediction for science and operational applications has now been initiated on basin and regional scales
• Interdisciplinary processes are now known to occur on multiple interactive scales in space and time with bi-directional feedbacks
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THE GLOBAL COASTAL OCEAN• Interesting and important interdisciplinary marine system• Contribution to global ocean dynamics generally
COASTAL OCEAN INTERACTIONS• Link together the land, the open sea, the atmosphere and the
underlying sediments• Impact global processes disproportionately to relative volume
COASTAL ZONE CHANGES• Local and global forcings• Natural and anthropogenic origins• Sensitive to climate change• Increasing human coastal populations and impact
COASTAL OCEAN MANAGEMENT• Scientific understanding essential input to advanced methods
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Atkinson, et al.,Vol. 13, THE SEA
Processes Vol 13
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The coastal ocean’s role in the global carbon cycle• Is coastal ocean net source or sink of CO2 to atmosphere?• Conclusions controversial at this time
– Varying definitions– Balances difficult to work out
High coastal ocean biological production• Most biologically productive part of world’s oceans• Processes which drive productivity not globally well known
Natural ecosystem variability• Shifts pre-date significant human influences• Physical-biological couplings under investigation
The role of the bottom• Coupling of bottom to water column generally poorly quantified on a
global basis
Understanding human impacts on the coastal ocean• Anthropogenic influences increasingly obvious and diverse
– Nutrient release can cause harmful algal blooms– Fishing practices can change ecosystems
Need for more data
Status of Knowledge
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Ducklow and McCallister, et al., Vol. 13, THE SEA
Biogeochemical Dynamics – Carbon and Nutrient Exchanges
• Exchanges between land, coastal ocean and open ocean
• 3 carbon pumps regulating CO2 between surface and deep ocean
• Biologically mediated exchanges between inorganic and organic carbon pools
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Alongi, Vol. 13, THE SEA
Key processes linking land, sea and atmosphere
• Intermingling of estuarine and oceanic boundaries and food webs• High fertility of coastal ocean ecosystem driven by nutrient inputs from
rivers and groundwater, upwelling, exchanges at shelf edge and atmospheric inputs
Ecosystem Dynamics
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Jahnke, Vol. 13, THE SEA
Sediment Dynamics – Transport and Reaction Processes
• Particulates converted through dissolution and remineralization• Adsorption, precipitation and biological production creates particulates
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Integrated Ocean Observing and Prediction Systems
Platforms, sensors and integrative models: HOPS-ROMS real-timeforecasting and re-analyses
AOSN II
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Critical reasons for coastal measurements:• Establishing a global baseline of coastal information,• Discovering ocean processes, understanding how they work, and
developing parameterizations,• Testing hypotheses,• Driving and evaluating numerical models,• Observing change, either secular (as in the atmospheric increase of
CO2), or low frequency (such as ENSO phenomenology), and• Essential for monitoring and input to management
Ability to measure improved radically• New sensors (optical techniques, Video Plankton Recorders, etc.)
How to deploy sensors evolving• Remote sensing, AUVs, Ocean Observatories
Knowledge of space/time scales is critical• Frequency, repetition, resolution
Measurements and Observations
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Models
Cury, et al., Vol. 13, THE SEA
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Linked, Coupled Models
Runge, et al., Vol. 13, THE SEA
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Linked Coupled Models and Adaptive Modeling
Harvard Ocean Prediction System - HOPS
Robinson and Lermusiaux,Vol. 12, THE SEA
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Measurements and Models: Data Assimilation in Advanced Interdisciplinary Ocean Prediction Systems
Robinson and Lermusiaux,Vol. 12, THE SEA
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Physics - Density
Biology – Fluorescence (Phytoplankton)
Acoustics – Backscatter (Zooplankton)
Almeira-Oran front in Mediterranean SeaFielding et al, JMS, 2001
Griffiths et al.,Vol. 12, THE SEA
Interdisciplinary Processes - Biological-Physical-Acoustical Interactions
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PAA PAO PAB
P = POA POO POB
PBA PBO PBB
Coupled Interdisciplinary Data Assimilation
Physics: xO = [T, S, U, V, W]
Biology: xB = [Ni, Pi, Zi, Bi, Di, Ci]
Acoustics: xA = [Pressure (p), Phase ()]
x = [xA xO xB]
P = (x – x t ) ( x – x
t )Tˆ ˆ Coupled error covariancewith off-diagonal terms
Unified interdisciplinary state vector
Lermusiaux and Chiu,Acoustic Variability, 2002Robinson and Lermusiaux,Theoretical and Computational Acoustics, 2003
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Coupled Physical-Acoustical Data Assimilation of real TL-CTD data:TL measurements affect TL and C everywhere.
Source
Receivers (VLA)
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Day 7 Day 10
Temperature
PhytoplanktonPhysical Assim.
PhytoplanktonCoupled Assim.
Coupled Physical-Biological Data Assimilation – Compatibility Issues
Anderson and Robinson,DSR I, 48, 1139-1168.
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Nesting HOPS in a Coarse-Resolution Climate PCM A.R. Robinson, P.J. Haley, Jr., W.G. Leslie
Nest a high-resolution hydrodynamic model within a coarse-resolution Global Circulation Model (GCM) to provide high-resolution forecasts of mesoscale features in the Gulf of Maine
•Results applicable to cod and lobster temperature-dependent behavior change, including recruitment
• Parallel Climate Model (PCM) outputs for 2000 and 2085 for coarse circulation (1 degree)
• Gulf of Maine Feature Model provides higher-resolution synoptic circulation (5km)
• Harvard Ocean Prediction System (HOPS) dynamically adjusts Feature Model output
Setup
Concept
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Gulf of Maine Feature Model
Parallel Climate Model (PCM)Ocean Fields
• Prevalent circulation features are identified• Synoptic water-mass structures are characterized
and parameterized to develop T-S feature models• Temperature and Salinity feature model profiles are
placed on a regional circulation template
Gangopadhyay, A., A.R. Robinson, et al., 2002. Feature-oriented regional modeling and simulations (FORMS) in the Gulf of Maine and Georges Bank, Continental Shelf Research, 23 (3-4), 317-353
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Dynamically adjusted fields for September 2000
Compare September 2000 and September 2085
Dynamically adjusted fields for September 2085
Temperature Salinity
• Temperature increases from 2000-2085
• Salinity increases from 2000-2085
• Details under study
• Fields provided to Union of Concerned Scientists (UCS) for studies on regional climate change effectshttp://oceans.deas.harvard.edu/UCS
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Regions and Syntheses
Western boundary – blue Eastern boundary – yellowPolar boundary – green Semi-enclosed seas - red
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Western Boundaries
Loder, Boicourt and Simpson,Vol. 11, THE SEA
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Lohrenz and CastroVol. 14A, THE SEA
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Western Ocean Boundaries
• Complex circulation patterns, typified by eddies and current instabilities, are key to enhanced nutrient entrainment and high biological productivity.
• Exchanges between offshore and coastal waters create a dynamic environment, in many cases stimulating high primary productivity.
• Role of intrusions of subsurface waters in enhancing nutrient supply is important for extensive areas of continental shelves.
• Linkages are evident within regions, and important linkages exist between western boundary current systems and other regions. Consequences and importance for ecosystem processes have only begun to be explored.
• Lack of observations limits understanding of physics and associated ecosystem processes. Examples: linkages between primary production and higher trophic levels, and impact on recruitment of key fisheries species; biogeochemical rates critical for carbon and nitrogen budgets; microbial processing of terrigeneous organic matter; denitrification; and, nitrogen fixation.
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Eastern Boundaries
Hill, Hickey, Shillington, Strub, Brink, Barton, Thomas,Vol. 11, THE SEA
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Mackas, Strub, Thomas, Montecino,Vol. 14A, THE SEA
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Eastern Ocean Boundaries
• Mechanisms and rates of nutrient supply, and differences in these between macronutrients (N, P, Si) vs. micronutrients (Fe, Cu, . . .)
• Within-region zonation of habitat utilization – ‘hotspots’ of high productivity and abundance, spawning centers, nursery grounds.
• Strong variability at interannual to decadal time scales. Important between-and within-region contrasts in seasonal and event-scale timing and sequencing of key processes, especially relative phasing of nutrient supply, advection, mixing, and somatic and reproductive growth of biota.
• Role of topographic complexity: islands, capes, canyons and shelf-edge irregularities produce important and recurrent perturbations of distribution fields.
Important research issues and oceanographic mechanisms are important in all or most regions, including:
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Polar Boundaries
Ingram, Carmack, McLaughlin, NicolVol. 14A, THE SEA
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Ingram, Carmack, McLaughlin, NicolVol. 14A, THE SEA
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Ingram, Carmack, McLaughlin, NicolVol. 14A, THE SEA
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Three types:i) nearly-enclosed with limited
exchanges with the open ocean (e.g. Sea of Okhotsk, Bohai Sea, Japan Sea)
ii) Partially-enclosed with moderate exchanges along 1 or 2 boundaries (e.g. Yellow Sea)
iii) Peripheral seas extending along continental margins and having strong interactions (e.g. Outer SE China Sea, shelf seas around Australia)
Semi-Enclosed Seas and Islands
Church, Bethoux, Theocharis, Vol. 11, THE SEA; Oguz and Su, Vol. 14, THE SEA
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The effective management and protection of coastal ecosystems must be science-based. With this general
purpose in mind, the COASTS Programme, sponsored by the Intergovernmental Oceanographic Commission of UNESCO and the Scientific Committee on Oceanic Research, was established to promote and facilitate
research and applications in interdisciplinary coastal and shelf ocean sciences and technology on a global basis to increase scientific understanding of coastal
ocean processes.
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THE SEAIdeas and Observations on Progress in the Study of
the SeasVolume 13: THE GLOBAL COASTAL OCEAN:MULTISCALE INTERDISCIPLINARY PROCESSES
Volume 14: THE GLOBAL COASTAL OCEAN: INTERDISCIPLINARY REGIONAL STUDIES AND
SYNTHESES
THE VOLUMES COMPRISE 60 CHAPTERS, 2550 PAGES, AUTHORED BY 170 INTERNATIONAL
SCIENTISTS.
Allan R. Robinson and Kenneth H. Brink, Editors
Part A – Pan-regional Syntheses and the Coasts of North America and South America and Asia
Part B – The Coasts of Africa, Europe, Middle East, Oceania and Polar Regions.
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Progress in interdisciplinary research on the multi-scale dynamics of the global
coastal ocean Three emerging concepts• coupled pelagic-benthic dynamical processes
interactive between the water column and the sediments
• significant contribution arising from coastal ocean biogeochemical cycles to global cycles and budgets
• large variety of dominant structures, trophic interactions and variabilities (robust-rapid change-robust) that occur in the highly productive coastal ocean ecosystems
These three concepts and their linkages now provide a powerful potential framework for
research directions
Challenging from intellectual, scientific, technical and methodological viewpoints
• specific research issues and next step problems essential
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To advance understanding of the dynamics of the complex global coastal ocean, critical processes must be identified and quantified by critical experiments and concomitant advanced theoretical/numerical models.
Efficient progress can be made by using processes to identify dynamically analogous regions of the global coastal ocean and sharing scientific information, technologies and methodologies among them
• coastal deep sea exchanges, benthic productivity, CO2 uptake/release, recruitment, etc.
• issues of measurability and modelability
• Many types of interactions among relatively well studied and less well understood regions can be fruitful
Progress 2: Critical Processes
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The material presented indicates the great complexity of the requisite scientific input and the unique opportunity for advanced management now provided by ongoing scientific and methodological progress, including advanced interdisciplinary ocean prediction systems.
Efficient and holistic management of the global coastalocean and its interconnected natural and national subregions is essential to ensure the health of the coastal seas and their ecosystems, and the well being of the ever increasing human coastal populations.
Achievable only via effective and well-motivated collaboration and cooperation among the scientific, technical, governmental, commercial, economic and environmental communities.
From a technical and methodological viewpoint we are at the threshold of a new management era.