aus dem MARUM und dem Fachbereich Geowissenschaften der ...

MARIA S. MERIAN-Berichte, Cruise 20, Leg 4, Bridgetown – Freeport, 14.3.2012 – 7.4.2012
Table of Contents Page
1 Summary .................................................................................................................................. 1
2 Participants ............................................................................................................................... 2
3 Research Program .................................................................................................................... 2
4 Narrative of the Cruise ............................................................................................................ 4
5 Methodology and Instrumentation ........................................................................................... 9
5.1 Marine Aerosol Network - Microtops II ......................................................................... 9
5.2 Underway Hydroacoustics ............................................................................................ 10
5.2.1 Attributed sensors (navigation, motion data, sound velocity) .......................... 10
5.2.2 USBL POSIDONIA .......................................................................................... 11
5.2.3 Multibeam echosounder (MBES) ..................................................................... 11
5.2.4 ATLAS PARASOUND .................................................................................... 12
5.2.5 Acoustic Doppler Current Profiler (ADCP) ..................................................... 12
5.3 Hydrography with CTD and Water Sampler ............................................................... 12
5.3.1 Objectives ......................................................................................................... 12
5.3.2 Sampling and methods ...................................................................................... 13
5.3.3 Shipboard Analyses .......................................................................................... 13
5.3.3.1 Seawater Oxygen Analyses ............................................................. 13
5.4 Sediment Sampling Gear and Sample Treatment ......................................................... 14
5.4.1 Grab Sampler......................................................................................................... 14
5.4.2 Box Corer ............................................................................................................. 14
5.4.3 Gravity Corer ........................................................................................................ 15
5.5. MARUM-CHEROKEE ROV ....................................................................................... 15
6 Preliminary Results by Region ............................................................................................... 16
6.1 The North-eastern Slope of the Campeche Bank off the Yucatan Peninsula ............... 16
6.1.1 Campeche Bank: Overview .............................................................................. 16
6.1.2 Campeche Bank: The Water Column Structure ................................................ 17
6.1.3 Campeche Bank: Bathymetry and Sub-Seafloor Structures ............................. 18
6.1.4 Campeche Bank: ROV Observations................................................................ 20
6.1.5 Campeche Bank: Sediment Sampling .............................................................. 24
6.2 The West-Florida Slope ................................................................................................ 25
6.2.1 The West-Florida Slope: Overview .................................................................. 25
6.2.2 The West-Florida Slope: The Water Column Structure ................................... 26
6.2.3 The West-Florida Slope: Bathymetry and Sub-Seafloor Structures ................. 28
6.2.4 The West-Florida Slope: ROV Observations ................................................... 29
6.2.5 The West-Florida Slope: Sediment Sampling .................................................. 32
6.3 The Southwest-Florida Slope ....................................................................................... 33
6.3.1 The Southwest-Florida Slope: Overview .......................................................... 33
6.3.2 The Southwest -Florida Slope: The Water Column Structure .......................... 34
6.3.3 The Southwest -Florida Slope: Bathymetry and Sub-Seafloor Structures ........ 34
6.3.4 The Southwest -Florida Slope: ROV Observations .......................................... 34
6.3.5 The Southwest -Florida Slope: Sediment Sampling ........................................ 35