USCG Polar Star overview & Particle export during SOFeX Ken O. Buesseler.

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Presentation transcript:

USCG Polar Star overview & Particle export during SOFeX Ken O. Buesseler

Planned Sampling Operations: Operationpersonnel, etc. Export- 234ThWHOI w/on board detectors- K. Buesseler & S. Pike SF6WHOI/UEA UK (J. Ledwell, A. Watson)- L. Houghton & L. Goldson surf. water pCO2AOML install prior to departure in Seattle (R. Wanninkhof) Major NutrientsTo collect & freeze for later analyses (ancillary team- C. Herbold, K. Mahoney, J. Tegeder, M. Coggeshall) Particles, small volume- POC/PON/bSi & pigments WHOI to collect for CHN & bSi (M. Brzezinski- UCSB); pigments (frozen for R. Bidigare, U. Hawaii); C/N isotopes (for M. Altabet)- Ancillary team Particles, large volume- 234Th, C/N isotopes share between Buesseler & Altabet for 234Th & stable C/N work- K. Buesseler & S. Pike DIC/DOCCollect & return for on shore analyses (F. Millero- U Miami/J. Bauer-VIMS)- R. Daniels IronFe dissolved, total & speciation from Kevlar/bottles & towed fish (P. Croot- IfM & R. Frew- U. Otago, NZ) Production- primary & bacterial 14C and 3H- (W. Smith-VIMS/R. Barber- Duke and H. Ducklow- VIMS)- C. van Hilst, R. Daniels Biological Fe stressFv/Fm- P. Boyd & E. Abraham (NZ) otherssalinity, radium (Herbold), bio (chl-C. van Hilst) Polar Star Science team

Polar Star cruise- 10 profile stations; 6 In, 4 Out

BC1 BC2 BC3 CTD2 CTD4 CTD6 6 “In” profiles- 5 at highest SF6; 1 shoulder sta. SF6 Goldson et al.

65 S W172 W SOFeX patch as seen from space 4 weeks after iron fertilization SeaWiFS ocean color Satellite image- Feb. 12, 2002, F. Chavez et al. SOFeX patch seen as SF6 peak & Fv/Fm peak Thorium-234 indicates similar particle flux in & out of patch (C flux may be elevated, but didn’t see diatom crash)

Calculate 234 Th flux from the measured 234 Th activities Low 234 Th = High flux Low 234 Th = High flux Prior Fe Fertilization export data: FeEX-II: 6 surface samples SOIREE: 1 5pt profile and & time-series integrals (better coverage for EISENEX & SERIES?) Thorium-234 approach for estimating particle export half-life = 24.1 days source = 238 U parent is conservative sinks = attachment to sinking particles and decay depth(m) [ 234 Th] 238 U      

Highest resolution thorium-234 data set See progression to lower Thorium-234 on average during course of SOFeX “In” patch (and “Out” stations also)

 234 Th/  t = ( 238 U Th)  - P Th + V where  decay rate; P Th = 234 Th export flux; V = sum of advection & diffusion In Out

Thorium-234 flux increasing both “In” and “Out”, but significantly larger increased particle flux in Fe fertilized patch - first time that we see So. Ocean export response to Fe!

POC export = 234 Th flux [POC/ 234 Th ] sinking particles See references by: Buesseler, Bacon, Benitez-Nelson, Cai, Charette, Cochran, Coppola, Dunne, Guo, Gustafsson, Hall, Langone, Miller, Moran, Murray, Pates, Roy-Barman, Rutgers vd Loeff, Santschi, Sarin, Shimmield, Smith, Wei & more ….. >53um particles: C/Th below 50m relatively constant - used in POC flux calculations Some evidence of increase C/Th “In” stations 0-50m - growth of phyto?

POC flux “In” increased from 7-8 to 11 mmol C m-2 d-1 - calculated at 50m Did not see “crash” of Fe induced bloom - flux still increasing; high Fv/Fm; still Fe….

Does iron fertilization lead to carbon sequestration into the deep ocean via sinking particles? FeExII- significant C flux (12 days) SOIREE- little/no C flux (13 days & satellite 55 days) EisenEx – little/no “C flux” (22 days) - lack of in/out differences (thorium-234) SOFeX- small C flux increase (27.5 days since t^0) - enhanced export “in” vs “out” (subtle changes) - did not see crash of Fe induced (or natural) bloom - maintained high photosynthetic efficiency - low loss terms imply efficient recycling of iron

N-patch: see no clear in vs. out or time-series trend ? hint at 10-20m on Feb. 19 th ? late station with lower PProd & Chl than Revelle