VOLUNTARY OBSERVING SHIP (VOS) DATA AS AN EXPERIMENTAL BACKGROUND OF WIND SEA STUDIES Vika Grigorieva, Sergey Badulin and Sergey Gulev (IORAS, Moscow State University, Novosibirsk State University) EGU You are welcome to get this presentation! Global Climatology of Wind Waves from VOS data:

MOTIVATION The state-of-the-art of the Global sea wave climatology is in an “outer look” of H and T as separate wave data – no “inner links”, dictated by inherent wave dynamics

MOTTO: Ab exterioribus ad interiora (from the outer to the inner )

LIVING OUR MOTTO I. To introduce “dynamical” climatology of sea waves basing on ALL MARINE DATA SETS (from the outer to the inner) II. To have an alternative to “outer stereotypes” (high, long waves…) Dynamically different wind seas: young, growing, old should be specified in terms of LINKS of the “outer” climatologies of H and T EGU2012,Vienna, Austria

QUESTIONS: 1. Are H and T of VOS data good for the alternative climatology? 2. Can we avoid “inconvenient” data, first of all, wind speed, for more compact and transparent climatology in terms of H and T only? 3. Does the resulting picture give something new as compared with the conventional sea wave climatology? EGU2012,Vienna, Austria

Simple theory - ABC and D One-parametric dependency is an indicator of wave growth case H= B(Wind) T R “Alphabet” of wind-wave growth reference cases (“Self-similarity of wind-driven seas”, Badulin et al., 2005,NPG, Gagnaire-Renou et al., 2011, JFM) A R=5/3 (Hasselmann et al. 1976) constant wave momentum rate B R=3/2 Toba's law (1972) constant rate of wave energy C R=4/3 (Zakharov & Zaslavkii, 1983) constant wave action rate D R=-1/2 swell, no input and dissipation, nonlinear transfer only EGU2012,Vienna, Austria

H-T dependencies for WIND SEA T = 1-30 sec T = 5-8 sec EGU2012,Vienna, Austria QC H ~ T R

H-T dependencies for SWELL T = 1-30 sec T = sec EGU2012,Vienna, Austria QC H ~ T R

EGU2012,Vienna, Austria YES! ANSWERS: YES! 1. Are H and T of VOS data good for the alternative climatology? 2. Can we avoid “inconvenient” data, first of all, wind speed, for more compact and transparent climatology in terms of H and T only? 3. Does the resulting picture give something new as compared with the conventional sea wave climatology?

WELCOME TO DISCUSS! EGU Photo A.Kharitonov