Lecture22A DeploymentStrategies Fixed Platforms sh

Lecture 22 Deployment StrategiesFixed Platforms: 

Lecture 22 Deployment Strategies Fixed Platforms Collin Roesler 18 July 2007

Issues related to fixed platform observatories, examples from the Gulf of Maine Ocean Observing System: 

Issues related to fixed platform observatories, examples from the Gulf of Maine Ocean Observing System Moored array issues System Integration Instrument characterization/calibration Biofouling Data Analysis

Moored Arrays: 

Moored Arrays Motivation Space/time (x, y, z, t) sampling strategies Advantages highly resolved time scales real time telemetry (line of site wireless, cell phone, satellite, irridium) 6 month deployments (TOGA TAO 12 months) Disadvantages no spatial information without other data sources (modeling, remote sensing, mobile platforms, shipboard surveys) biofouling

Time and Space Scales: 

Time and Space Scales

Moored Arrays: 

Moored Arrays Motivation Space/time (x, y, z, t) sampling strategies Advantages highly resolved time scales real time telemetry (line of site wireless, cell phone, satellite, irridium) 6 month deployments (TOGA TAO 12 months) Disadvantages no spatial information without other data sources/arrays (modeling, remote sensing, mobile platforms, shipboard surveys, arrays) biofouling

System Integration: 

System Integration Mooring types subsurface float vs. surface expression taut vs. elastic vs. scoping

System Integration: 

System Integration Mooring types subsurface float vs. surface expression taut vs. elastic vs. scoping System control centralized control (wired vs. inductive modem) centralized vs. local data storage Power centralized power vs. local power solar cells, traditional batteries, on board generation Real estate everyone wants the surface positions flow and drag simulations Data telemetry band width limitations onboard processing redundant telemetry

Instrument characterization/calibration: 

Calibrations Instrument characterization/calibration pure water cals total offset biofouling instrument drift - Re-deployment calibration (4)

Instrument characterization/calibration: 

Calibrations Instrument characterization/calibration pure water cals total offset biofouling instrument drift

Instrument characterization/calibration: 

Instrument characterization/calibration Calibrations Environmental characterization temperature salinity pressure irradiance

Chlorophyll Fluorometer Characterization: 

Chlorophyll Fluorometer Characterization

Chlorophyll Fluorometer Characterization Temperature Dependence: 

Chlorophyll Fluorometer Characterization Temperature Dependence

Chlorophyll Fluorometer Characterization Temperature Dependence: 

Range 1 to 5 counts/oC Chlorophyll Fluorometer Characterization Temperature Dependence The temperature dependence, of course, varies between sensors and between sensor type

Chlorophyll Fluorometer Characterization Correction for Temperature Dependence: 

Chlorophyll Fluorometer Characterization Correction for Temperature Dependence ~0.25 mg/l Compounding Issue: The biggest temperature effect occurs in the winter (DT), and that is when chlorophyll is lowest.

Biofouling: 

Biofouling

Biofouling: 

Biofouling Prevention toxic coatings copper shutters copper tape copper tubing

Biofouling: 

Biofouling Identification Long term trends

Biofouling: 

Biofouling Identification Long term trends Redundancy

Biofouling: 

Biofouling Identification Long term trends Redundancy

Biofouling: 

Biofouling Identification Long term trends Redundancy Temporal patterns

Biofouling: 

Biofouling Correction after the fact: calibrations real time redundancy signal separation flagging

Biofouling: 

Biofouling Correction after the fact: calibrations

Biofouling: 

Biofouling Correction after the fact: calibrations real time Redundancy (is signal real?) Signal separation (is it one component?) Flagging (pretty sure it is an artifact)

Calibrated Chlorophyll Fluorescence Time Series: 

Calibrated Chlorophyll Fluorescence Time Series