Puget Sound Tow CTD chain TestJanuary 4, 2011

Participants:Scientist : Frank Henyey, Barry MaCaptain : Eric BogetEngineer : Tim McGinnis, Tim Wen, Nicolas Michel-HartSBE expert: Joel Reiter, Robin Clifford

TOWSBE Tow chain system with inductive SBE microCATS Steel armored cable (long-line fishing proof). Real time inductive queries Internal recording Adjustable sensor amount and depth Attachable Fairing system

Sea Cable150m

6-8SBE37IMPMicroCats

V-Fin Depressorw/Lower Electrode

Deck Unit

Deck Cable30m

R/V Robertson

A-Frame

Steel or Kevlar Tow Cable

Electronics Housing

Winch

LabView interface

Puget Sound Trial January 4, 2011

Sea Cable150m

6-8SBE37IMPMicroCats

V-Fin Depressorw/Lower Electrode

Deck Unit

Deck Cable30m

R/V Robertson

A-Frame

Steel or Kevlar Tow Cable

Electronics Housing

Winch

New clamp designSwing with flow

Fairing reduce drag and strumming

Electronic housing

SBE37IM x8

Depressor

80m Fairings

150 m armored coax sea-cable

UIMM

UIMMx1

15meter interval

January 4, 2011 TOWSBE Puget Sound Trial

8 SBE 37 IM sensors (C, T, P) with 150m armored cable SBE sampling interval 10s, query 1 period: dn20 /3min, query2: dn10/3min Towing speed 1~ 4 kts Upper and lower boundaries mark the instrument depth Black dots indicate near real-time data query during the Puget Sound Trial.

query 1 query 2

Detail Ocean Structure Reviewed

January 4, 2011 TOWSBE Puget Sound Trial

TOWSBE Puget Sound trial results New clamp designs ensured the micorCATs swing freely Armored sea cable has good inductive character for data transmission and

also prevent potential damage from long-line fishing. Ship speed over 4 kts affect inductive transmission. More query errors

occurred. Possible caused by the cable strumming due to the upper 70m without fairings during the Puget Sound trial.

SBE37 IM #1 and #2 (top two sensors ) have more query errors (cable strumming? loaner units? older IMM model? without pump?)

microCATs internal recordings data are good. High resolution downloaded after TOWSBE recovery

Little flow effect observed on the microCATs conductivity data (need to further verify).

LabView interface and Matlab near real-time processing are tested.

Data: SBE raw and Queriedhttp://kirin.apl.washington.edu/~barry/TOWSBE_0104_2011/data/Cable strumming videohttp://kirin.apl.washington.edu/~barry/TOWSBE_0104_2011/movie/Strumming0104.AVI

IWISE Field Program TOWSBE Spec 800m armored sea cable Fully faired ~ 40 microCATs sensors ~10 HOBO U10 loggers 3-4 kts towing speed High resolution T,C,P data internal recording Real time inductive query for assessing ocean condition