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Air-Sea Interaction Profiler (ASIP)

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Air-Sea Interaction Profiler (ASIP). Scientific objectives behind ASIP: What is the functional depth distribution of the physical/chemical/biological components at the ocean surface?

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slide1

Air-Sea Interaction Profiler (ASIP)

Scientific objectives behind ASIP:

  • What is the functional depth distribution of the physical/chemical/biological components at the ocean surface?
  • Do the species assemblage and/or abundance of neustal organisms influence O2 production and CO2 uptake, and therefore the exchange of gases across the air–sea interface?
  • To what extent does the interplay of the physical/chemical/biological processes affect each other?
  • What is the concentration gradient of gases within the ocean surface layer and how much does this affect the determination of the gas fluxes?
  • What is the quantitative dependence of CO2 air–sea fluxes on the following factors: wind speed,turbulence level, stratification, temperature, salinity, insolation, humidity, precipitation, bubble population, skin effect
slide2

Upper Ocean Autonomous Profiling

  • The Air-Sea Interaction Profiler (ASIP) measures several parameters from one platform
  • Positively buoyant instrument submerged with a thruster
  • Measurements made during ascent only
  • Maximum depth 100m
  • Ascent rate ~ 25 cm/s
  • Overall length ~ 2 m
  • Weight ~65 kg
  • Onboard power 1000Whr from Li-ion batteries
  • GPS receiver to determine position
  • Iridium modem for transmitting position and mission parameters
  • Realtime mission change with iridium SBD (short burst data)
  • Xenon flasher for nighttime location
slide3

ASIP Sensors

  • Sensors:

- Shear (x2)

- Temperature microstructure

  • Conductivity
  • PAR
  • Fluoresence
  • Oxygen
  • Pressure
  • Video
slide4

ASIP Autonomous Profiling

  • Thruster submerges ASIP to programmable depth
  • ASIP descends at an angle for profiling in undisturbed water
  • Thruster controlled by onboard computer
slide6

Air-Sea Interaction Profiler (ASIP)

  • Shear (x2) to estimate rates of dissipation
  • Temperature (x2) for microstructure and stratification
  • Conductivity (x2) for microstructure and density
slide7

Air-Sea Interaction Profiler (ASIP)

  • Pressure for a record of depth within the water column
  • Fluorescence/transmissivity for chlorophyll and

water clarity

  • Video microscope for high–resolution images of biological species and bubbles
slide8

Air-Sea Interaction Profiler (ASIP)

  • Oxygen for chemical gradients in the water
  • PAR for light absorption in the water column
slide9

ASIP during deployment

  • Profiles over the depth of the mixed layer
  • Typical mission of 5-minute profiles for 24 hours
  • Ocean turbulence from shear and temperature microstructure
  • Chlorophyll from fluorometer (calibrated with shipboard water samples)
  • Attenuation of light from PAR sensor
  • Profiles of oxygen
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