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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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


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


ASIP Sensors

  • Sensors:

    - Shear (x2)

    - Temperature microstructure

  • Conductivity

  • PAR

  • Fluoresence

  • Oxygen

  • Pressure

  • Video


ASIP Autonomous Profiling

  • Thruster submerges ASIP to programmable depth

  • ASIP descends at an angle for profiling in undisturbed water

  • Thruster controlled by onboard computer



Air-Sea Interaction Profiler (ASIP)

  • Shear (x2) to estimate rates of dissipation

  • Temperature (x2) for microstructure and stratification

  • Conductivity (x2) for microstructure and density


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


Air-Sea Interaction Profiler (ASIP)

  • Oxygen for chemical gradients in the water

  • PAR for light absorption in the water column


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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