The 4th Japanese-German Meeting on Urban Climatology
Tsukuba, 30th Nov. - 2nd Dec., 2005
A-2
A STUDY ON INFLUENCE OF LAND AND SEA BREEZE ON AIR
TEMPERATURE
IN HIROSHIMA WIDE AREA IN SUMMER SEASON
Tadashi KIYOTA, Akira TANIGUCHI, Nobuyoshi KIYOTA and Yasuhiro NAKAMURA
In this study, we analyzed about relationship between sea-land breeze and air temperature
in the Hiroshima wide area in a summer season.
The summary of the results is shown below.
1) At the time of sea breeze during daytime, sea breeze decreases air temperature rise in
the shore, but in the suburbs, sea breeze increases air temperature rise by the
movement of the heat generated in the urban region.
2) At the time of the land breeze of night, land breeze reduces air temperature in the
Ohta-riverside point, and the reduction effect of temperature was shown also near the
mouth of the Ohta-river by development of land breeze.
In this study, we analyzed the difference of the air temperature in the urban area of
Hiroshima among calm, sea breeze and land breeze by the observation.
The summary of the results is shown below.
1) In the calm period, the air temperature in the urban area rises. However, the air
temperature is slightly lower in green belt and around the river. It is caused by the
influence the micro-scale climate.
2) In the sea breeze period, the air temperature of urban area lowers inversely as the
distance from the coastline. In addition, the air temperature lowers around the river,
since it becomes a way of the wind. It is the phenomena of the meso-scale.
Student, Graduate school, Yamaguchi University, M. Env.
Student, Graduate school, Hiroshima Institute of Technology, M.Env.
Prof., Hiroshima Institute of Technology, Dr. Eng.
Prof., Yamaguchi University, Dr. Eng.
0.1
1.0
3.0
0.1
-0.1
-0.1
1.0
-1.0
-1.0
3.0
-3.0
16ｈ
27.8℃
-3.0
10ｈ
25.3℃
N
N
3m/s
3m/s
1℃
-1℃
1℃
-1℃
2℃
-2℃
2℃
-2℃
3℃
-3℃
3℃
-3℃
NNW 60
NW
40
N
NNW 60
NW
40
NNE
NE
WNW
20
ENE
WNW
20
W
0
E
W
0
WSW
ESE
SW
SSW
SE
SSE
S
-2-
N
NNE
NE
ENE
E
WSW
ESE
SW
SSW
SE
SSE
S