System  Nordsee

301

List  of  Tables

Atmospheric  Physics

Table  2-1:  Calendar  of  daily  weather  types  in  2006.  Red:  C  &  CDIR;  Blue:  A  &  ADIR;  Bold  (+,  ++]:
Gale  (severe,  very  severe)  44
Table  2-2:  Contingency  table  of  weather  types  in  2006  (%)  44
Table  2-3:  Calendar  of  daily  weather  types  in  2007.  Red:  C  &  CDIR;  Blue:  A  &  ADIR;  Bold  (+,  ++]:
Gale  (severe,  very  severe)  45
Table  2-4:  Contingency  table  of  weather  types  in  2007  (%)  45
Table  2-5:  Seasonal  and  annual  relative  frequencies  of  reduced  weather  types  in  2006  and

2007.  47
Table  2-6:  Calendar  of  reduced  weather  types  in  2006  48
Table  2-7:  Monthly  frequencies  of  reduced  weather  types  in  2006  48
Table  2-8:  Calendar  of  reduced  weather  types  in  2007.  49
Table  2-9:  Monthly  frequencies  of  reduced  weather  types  in  2007.  49

Table  2-10:  Mean  lifetime  in  days  of  reduced  weather  types  and  the  anonymous  >thing-in-itself<
(NN)  for  the  period  1971  -  2000  and  years  2006  and  2007.  56
Table  2-11:  Weather-type  transitions  for  base  period  1971  -2000  (NCEP).  £:  Count  matrix  of
rounded  transition  frequencies  for  the  climatological  year.  G:  Transition  frequencies  for  0.
order  Markov  chain,  g^  =  RSjCSj/364.  P(=P 1 ):  Transition  matrix  of  1.  order  Markov  chain,
obtained  fromC  via  Cij/RSj);  n:  Eigenvector  (tt  =  ttP),  stationary  (unconditional  climatological) ­
  distribution.  Entries  Pij( 2 Pij,  ePij)  of  matrix  P  =  P 1  (P 2 ,  P 6 )  are  conditional  probabilities
for  transitions  of  the  Markov  chain  from  current  state  s,  to  state  Sj  within  1  (2,6)  time  steps
(days).  E:  Embedded  transition  matrix  (without  sojourn  times,  from  C  as  Pfor  Ca  =  0).  ...61

Table  2-12:  Same  as  Table  2-11,  except  for  2006  (left)  and  2007.

66

Table  2-13:  North  Sea  Wind  statistics.  Means  and  standard  deviations  (m/s)  for  zonal  (u,s u )
and  meridional  wind  components  (v,  s v ),  vector  wind  and  direction  (V,  Vdir),  velocity  (Vel),
persistence  (V/Vel  in  %),  and  »area«  of  50%-probability  ellipse  (FE 50 =  1.3863ns a s b inJ/
kg)  85

Table  2-14:  North  Sea  Wind.  Mon  thly  statistics:  Wind  direction,  vector  (V)  and  scalar  (Vel)  wind
speed  (m/s)  and  persistence  (V/Vel  in%)  90

Table  2-15:  Excess  probabilities  of  the  empirical  cumulative  distribution  function  (row  2)  for
Jenkinson-Collison  gale  thresholds  (row  1)  and  gale  thresholds  (row  4-6)  for  »trimmed«
excess  probabilities  (row  3)  of  various  distributions  94
Table  2-16:  Return  periods  for  storms  of  minimum  severity  G*  due  to  the  GPD.  V  and  £  are  associated ­
  maximum  windspeeds  and  vorticities  (rpd  =  revolutions  per  day)  as  given  by  the
half-axes  of  the  storm  ellipses  (G*  =  b*=a*/2).  NCEP-thresholds  for  gales  (G),  severe  gales
(SG),  and  very  severe  gales  (V5G)  are  in  bold  print.  Severities  beyond  those  of  the  last  row
are  impossible  on  account  of  the  GPD's  positive  shape  parameters  94
Table  2-17:  The  10  most  severe  gales  during  1948-2011  (NCEP).  rDV 1  =  l//l/ max (T ; ]  -  1  is  the
relative  departure  of  windspeed  from  max.  possible  windspeed  associated  with  VSG
threshold  (return  period  1  yr,  cf.  Table  2-16)  97
Table  2-18:  Number  of  severe  and  very  severe  gale  days  (5G|  VSG)  98
Table  2-19:  Total  number  of  gale  days  (G+SG+VSG)  99