Variables for the  Semaphore  experiments :
           R/V  Le Suroit

  30 min. data from the ALBATROS database  at
    http://dataserv.cetp.ipsl.fr/

  1. date = year-month-day
  2. hour = decimal hour ( denotes end of 30 min. data period )
  3. lat  = latitude North ( - = South )
  4. lon  = longitude East ( - = West )
  5. ws = true wind speed at 16.5 meters ( Gill solent sonic anemometer )
  6. nws = 10 m neutral wind speed ( from Bulk alogrithm )
  7. seaT = sea near-surface temperature ( from Thermosalinograph )
  8. airT = air temperature at 14.5 meters ( Vaisala sensors )
  9. airpT = 10 m neutral potential temperature ( from Bulk alogrithm )
 10. qa  = specific humidity at 14.5 meters 
 11. nqa  = 10 m neutral specific humidity ( from Bulk alogrithm )
 12. rhum = relative humidity at 14.5 meters ( Vaisala humidity capacitors )
 13. pres = atmospheric pressure
 14. lwr  = downward infrared radiation flux ( calculated )
 15. swr  = downward solar radiation flux ( EPPLEY pyranometer )
 16. nflux = net radiation flux ( from Bilanmeter )
 17. wdir = true wind direction at 16.5 meters
 18. shf  = sensible heat flux ( IDM )
 19. bshf = sensible heat flux ( Bulk )
 20. lhf  = latent heat flux ( IDM )
 21. blhf = latent heat flux ( Bulk )
 22. ustar = friction velocity ( IDM )
 23. bustar = friction velocity ( Bulk )
 24. spar = stability parameter Z/L ( IDM ) Z = 16.5 m
 25. bspar = stability parameter Z/L ( Bulk ) Z = 16.5 m
 26. prec = precipitation rate