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French oceanographic cruises G. Reverdin, F. Marin

French oceanographic cruises G. Reverdin, F. Marin.

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French oceanographic cruises G. Reverdin, F. Marin

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  1. French oceanographic cruisesG. Reverdin, F. Marin • French oceanographic cruises with XBTs launched ship steaming arond 10-12 knots between two CTDs typically 20-40 km apart from XBT. The launch is done manually from a position fairly low above water, typically near the aft of the ship or along the side (a little higher on DTX, seems to be) • There seems to be generally no documentation on the equation used in the French archives (‘unknown’). And for the recent ones, different choices have been done on the total depth of reported data (and no correlation with the equation used) • Comparisons of XBT T(3m) with intake temperatures have not been done, but this is possible in a large number of cases. • Cruises are in the tropical Oceans mostly (from 1979, 1980, 1983, 1985, 1986, 1991, some of the PIRATA cruises since 1997, EGEE cruises, 2005-2007); also mid-latitude North Atlantic (Semaphore, 1993; POMME 2000-2001 among others)

  2. POMME winter-early spring 2001Hanawa

  3. POMME late summers 2000 and 2001original

  4. POMME winter-early spring 2001original

  5. EGEE1 June 2005Hanawa

  6. EGEE3 June 2006Hanawa

  7. EGEE2 Sep 2005original

  8. EGEE4 Nov 2006original

  9. EGEE5 June 2007original

  10. EGEE6 Oct 2007original

  11. EGEE1: numerous problems. Why? • All EGEE (except EGEE5, 6 on the R.V. Antea) show positive SST anomaly (0.06°C) and upper thermocline too warm (suggesting depth overestimated down to 80m). Is same software used (MK12 EGEE1 MK21 others, but I dont know for EGEE5, 6) • Pomme winter data on Atalante dont have a positive SST bias. On the other hand the late summer Thalassa ones have a 0.12°C bias (same software, same batch of XBTs). The DTX winter ones also seem to have a small bias (0.04°C). Questions: Do we trust the CTD SSTs during ‘warm’ season? (mixing by the ship in station: what is its effect?). • Conditions on research vessels very different than the ones on merchant vessels (height of launch of XBTs; also position on the ship somewhat different)

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