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SUMMARY:Measuring ocean bottom pressure for geostrophic reference velociti
 es
DTSTART:20260706T090000Z
DTEND:20260706T100000Z
DTSTAMP:20260712T113700Z
UID:indico-event-1130@events.geomar.de
DESCRIPTION:Speaker: Dr. Simon Wett\, Experimental Oceanography Unit\, Ins
 titute of Oceanography\, Hamburg\nHybrid  -  online via \nhttps://geoma
 r.webex.com/geomar-en/j.php?MTID=m6f187b689fccd196c05d249d28f6d0d8\nAbstra
 ct:Large scale estimates of ocean transport are routinely made from moored
  hydrographic measurements. This is done using the thermal wind relation\,
  which relates zonal density gradients to vertical gradients of meridional
  velocities. To estimate meridional transport\, a constant of integration 
 – the geostrophic reference level velocity – is required\, typically a
  level-of-no-motion or a level-of-known-motion. If ocean pressure at the s
 eafloor is known to high accuracy\, then the velocity can be computed dire
 ctly from zonal pressure gradients. However\, oceanographic pressure senso
 rs suffer from intrinsic drift\, which results in a drift in the calculate
 d velocity. For a 1-year deployment\, this drift can be several centimeter
 s of liquid water equivalent\, corresponding to a meridional transport of 
 several Sverdrups. Novel drift-correcting bottom pressure recorders are ca
 pable of determining the sensor drift by using multiple pressure sensors. 
 We evaluate pressure measurements obtained from a pair of drift-correcting
  bottom pressure sensors deployed at the tail of the Grand Banks (2023-202
 5). We compare the drift-corrected pressure estimates with GLORYS reanalys
 is data. The required residual accuracy is roughly O(1 cm)\; if this accur
 acy can be achieved in situ\, drift-correcting bottom pressure sensors wou
 ld provide a valuable additional constraint on the time-varying\, zonally-
 averaged barotropic circulation estimated from mooring arrays spanning the
  Atlantic.\n \n\nhttps://events.geomar.de/event/1130/
LOCATION:5-1.214 - PAZIFIK / PACIFIC- Rechte Seite - Großer\, unterteilba
 rer Konferenzraum (GEOMAR - Standort Ostufer  / GEOMAR - East Shore)
URL:https://events.geomar.de/event/1130/
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