20
3 Study Area
Table 3.2.1 Meteorological data. type of representation and their units
Water temperature
Air temperature
Atmospheric pressure
Wind speed
Wind direction
Cloud cover
Air temperature
type of representation
unit
value at 6.00 a.m.
24 h - Mean
24 h - Mean
24 h - Mean
24 h - Mean
24 h - Mean
["C)
rOC)
[mbar)
[m/s)
0° North
90° East
180" South
270 0 West
Values from 0 - 9
0= without clouds
9 = complete cloud cover
During the three years of observation air temperatures reached values between
- 10 °C and + 28 °C (Fig. 3.2.2). In February 1994 a cold spell of ten days took
place with temperatures below 0 0c, Afterwards the air temperature increased
continuously. Maximum values of 26 °C were reached in July and August. From
August onwards the values decreased slowly. In autumn and winter air temperatures ranged from - 2 °C to 10 0c,
In January 1995 temperatures were below 0 °C for a short period, from the
middle of May until the middle of October values over 10 °C were measured with
maximum values in July and August around 23 0c, Temperatures dropped below
o °C in December. The low temperatures lasted, with a few exceptions, for an
unusually long duration of nearly four months. In April 1996 the temperatures rose
for a short period up to 17 °C, but dropped subsequently below 10 0c, By the end
of May temperatures remained above 10 0c, Except for a few record values the air
temperatures remained below 20 °C over the summer period. 1996 can be considered as an exceptionally cold year.
30 ~--~~--~--~--r--'--~---r--~--.--.--~
20
010
~ 0
~
220
~ 10
8. 0
E
~ 20
.~ 10
o
-10 +---=-j.}L--+----I----f----+--1---+---\----+---+--1c----'1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
.q0>
0>
lO
0>
0>
(0
0>
0>
Fig. 3.2.2 Air temperature in the years of observation at the weather station Norderney, data
courtesy of the DWD