Seaglider observationsintheGulfofOman:
Localised eddy-drivenupwellingandproductivity
BastienY.QuesteCentreforOceanandAtmosphericSciences,UniversityofEastAnglia,Norwich,NR47TJ,UK.
Contact ::[email protected]::www.byqueste.comIOCWestPac Meeting
Putrajaya,7th May2018
UEA owns a total of ~10 instruments7 x 1000m glidera 6000m glidera shallow glideran Autonaut surface vehicle
Standard: CTD, O2, Chlorophyll, CDOM & backscatter, currents (u, v and w)
Optional: PAR, echosounder, passive acoustic & microstructure turbulence
Testing: pH, pCO2, ADCP, N & P sensors
UEA Glider Group:5+ permanent faculty3 research staff2 engineering staff9+ PhD students
Winter(NE)monsoon Intermonsoon Summer(SW)monsoon
December– February March– MaySeptember– November June– August
P.L’Hegaret (2015)
Questeetal.(2018).PhysicalcontrolsonoxygendistributionanddenitrificationpotentialinthenorthwestArabianSea.GeophysicalResearchLetters
DatafromHydrobase 3
IIOE-1 JGOFS/ARABESQUE
PGW
Questeetal.(2018).PhysicalcontrolsonoxygendistributionanddenitrificationpotentialinthenorthwestArabianSea.GeophysicalResearchLetters
2Seaglider Deploymentsalong80km transect
- March– June2015
- December– March2016
Totalof58repeatobservationsofthetransect(twiceperweek)
Veryhighresolution:1.3kmhorz /0.5mvertRelativevorticity
PGW
Questeetal.(2018).PhysicalcontrolsonoxygendistributionanddenitrificationpotentialinthenorthwestArabianSea.GeophysicalResearchLetters
• MarchtoJune
• Standardpattern:collapseofthebloomthroughmixingandthengradualstratificationwithapersistentdeepchlorophyllmaximum.
doRosarioGom
eseta
l.(2014)
Questeetal.(2018).PhysicalcontrolsonoxygendistributionanddenitrificationpotentialinthenorthwestArabianSea.GeophysicalResearchLetters
PGW
80kmStoN
• Developingnewmethodtodirectlymeasureupwellingfluxinsitu:
𝑑(𝑏𝑢𝑜𝑦𝑎𝑛𝑐𝑦×𝑔)𝑑𝑡𝑖𝑚𝑒 ×𝑑𝑟𝑎𝑔34 −
𝑑𝑝𝑟𝑒𝑠𝑠𝑢𝑟𝑒𝑑𝑡𝑖𝑚𝑒
• Thehighintermonsoonchlorophylla isnotvisibleinremotesensing.
• Estimatesofproductivityintheregionareallbased,orvalidated,onremotesensing.
• MarchtoJune
• Standardpattern:collapseofthebloomthroughmixingandthengradualstratificationwithapersistentdeepchlorophyllmaximum.
Left. Glider calibration vs satellite showing what satellites can “see” (lines) and depth integrated chlorophyll a (black dots). Remote sensing cannot resolve the elevated biomass at the DCM
DCM(inter-monsoon)
WithcolleaguesfromthePlymouthMarineLab.
Loveday,Smyth&Queste,inprep.
• Asimilarproblemhappenslaterintheyearduringthestartofthespringbloom.
• DecembertoMarch
Temperature
Chlorophyll
Left. Glider calibration vs satellite showing what satellites can “see” (lines) and depth integrated chlorophyll a (black dots). Remote sensing cannot resolve the elevated biomass at the DCM
Bloomevent(monsoon)
WithcolleaguesfromthePlymouthMarineLab.
Loveday,Smyth&Queste,inprep.
KeyPoints:
•Primaryproductionisnotwellconstrainedbyremotesensingalgorithmsintheregion
•Submeso- andmesoscaleprocessesregulatehorizontalandverticalfluxesofChl a,CandO2
•Glidersareusefulforlinkingscales(submeso/meso)tobasinandseasonaldynamics(highresolutionandendurance)
•Candofullbiogeochemicalandphysicalobservationofupwellingfor~110kUSDat1.5km/0.5mresolutionforafullyear!
Doesn’thavetoberareand(too)expensive!
Contact ::[email protected]::www.byqueste.com
ONR GLOBAL N62909-14-1-N224/SQU SQU EG/AGR/FISH/14/01SQU IG/AGR/FISH/17/01 UK NERC NE/M005801/1UK NERC NE/N012658/1