VOLUNTARY OBSERVING SHIP VOS DATA AS AN EXPERIMENTAL

VOLUNTARY OBSERVING SHIP (VOS) DATA AS AN EXPERIMENTAL BACKGROUND OF WIND SEA STUDIES EGU 2012 -8542 Vika Grigorieva, Sergey Badulin and Sergey Gulev (IORAS, Moscow State University, Novosibirsk State University) Global Climatology of Wind Waves from VOS data: http: //www. sail. msk. ru/atlas You are welcome to get this presentation!

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 EGU 2012, 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? EGU 2012, Vienna, Austria

Simple theory - ABC and D One-parametric dependency is an indicator of wave growth case H= B(Wind) TR “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 EGU 2012, Vienna, Austria

H-T dependencies for WIND SEA 1970 -2011 T = 1 -30 sec H~TR T = 5 -8 sec QC EGU 2012, Vienna, Austria

H-T dependencies for SWELL 1970 -2011 T = 1 -30 sec H~TR T = 10 -16 sec QC EGU 2012, Vienna, Austria

ANSWERS: 1. Are H and T of VOS data good for the alternative climatology? YES! 2. Can we avoid “inconvenient” data, first of all, wind speed, for more compact and transparent climatology YES! in terms of H and T only? 3. Does the resulting picture give something new as compared with the conventional YES! sea wave climatology? EGU 2012, Vienna, Austria

WELCOME TO DISCUSS! EGU 2012 -8542 Photo A. Kharitonov