CLIVAR OCEAN REANALYSIS

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Results assess prelim.

• WWV in Pacific 5S-5N and 20S-20N
• Variability in most runs similar but with mean
  offsets (5)
• Presumably most long-runs forced with NCEP winds?
• H-L (ENSO) transitions in 83-84 87-88, 97-98
  appear in all runs
• Other H-L transitions in 69-70, 72-73, 76-77
• UKDP low 5? (low res Equator 1.25x1.25)?
• All UKMO runs fairly consistent for 20?
• All ECCO runs low or drifting low in both 5? and
  20? (4dVar)?
• ECCO50y, ECCO-SIO slightly reduced variability?
• K7 20? only downward drift 87-93 then similar to
  ECCO (4dVar)?

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Literaturesurvey

• D20 variability from BMRC

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Literature survey

• N Atlantic STMW 18C water
• 1988gtcolder mode water 1989gtwarmer mode water
  (Klein and Hogg (1996)
• SST warming 1910-1960 then cooling (Fieux
  Stommel)
• Talley, JoyceRobbins
• Strong (more) STMW in ve NAO years 56-57, late
  60s, early 80s
• Weak (less) STMW low salinity after ve NAO,
  75-78
• Bermuda PV (thickness) changes rapidly in
  65,75,80,85-87
• Dickson et al
• STMW out of phase with Labrador sea water and NAO
• NAO gt More Lab sea water production less STMW
  (reduced S)
• -NAO gt More STMW less Lab Sea

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Results assessment prelim

• N Atl 18C Mode water Volume
• Many more differences between products
• SODA, UKDP, UKOI similar level variability over
  50 yrs CERFACS 10 lower GFDL 15 lower (annual
  data only)
• MOVE-G consistent with above (92- )
• MERC 15 low through (93- ) with small
  variability
• UKGS larger interpentadal variability from (90- )
  
• ECCO50y large inter-decadal var. only with Peaks
  in 71,82,97 consistent with rest (ECCO-SIO
  similar (92-)) 30 changes
• ECCO-GODAE v. low but variability (92- )
  consistent
• ECCO-JPL Low with no identifiable var. signals
• N Atl 18C Mode water Salinity
• Outliers GFDL, ECCO-JPL, ECCO-SIO
• Most show more variability and reduced S during
  1990s

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Literature survey

• Labrador sea T and S (after Lazier)
• T,S increase 50-70 sharp decrease to 75 and again
  88-95
• S more slow decrease 70 -95

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Results