Relationship between clouds over Fukui Cityand near-surface climatic elements

Contents・Introductioon
・Method・Result・Consideration

Introduction

Introduction

cumulonimbus cloud

nimbostratus cloudIntroduction

Laws of cloud form appearances exist?
▼Relationship with atmosphericconditions exist?

Introduction
Examine the atmosphereexamine the state of the atmosphere in
the sky up to approximately 30 km.
Observations are conducted atapproximately 700 locations nationwide
radiosondeIntroduction

No radiosonde flying in Fukui▼
Using it is impossible▼
Relationship to atmospheric conditions
near the ground, not above

Introduction

Relationship between the climatic elements near
the surface and cloud formations exist？

Introduction
In the weather forecast
Use surface data such as wind speed, cloud
cover, atmospheric pressure, humidity, etc.
▼No cloud forms are used

Method

Methodcorrecting period
nearly 5 months from mid-June to October
10 hours from 8:00 a.m. to 6:00 p.m.

Method・Install toward Fukui, where the
Fukui District MeteorologicalObservatory is located.
・Take a picture of the sky over
Fukui City every 10 minutes.

brinnotime-lapse camera

Method
Fukui District
Meteorological Observatory

Gather climate elements
near the ground.
Use data from the Fukui
District MeteorologicalObservatory.
Takefu High School

Method
式１ TL＝1/[1(Td-56)+ln(T/Td)/800]+56
式２ TL=2840/[3.5ln(T)-ln(e)-4.805]+55
式３ TL=1/[1/(T-55)-ln(f/100)/2840]+55
LCL=(T-TL)/9.8×1000(乾燥断熱減率の式）
ヘニングの式(式４) LCL=125×(T-Ta)

Method● fluffy● cloud base is flat
● Cloud base altitudeis 1200m▼
it is called a cumuluscloudMethodResultResult1.cumulus cloudbarometricpressuretempelaturehumidity

Most observed could
６月２２日の例

Result.1 cumulus cloud81observation

Result.1 cumulus cloud

windSoutheast, Southwest
direction
temperature up
humidity down
atmosphericdown
pressureResult.1 cumulus cloud

seasonal
winds
Ogasawara
air mass

updraft結果2

Changes in lifting condensation altitude
andRelationship between the occurrence ofturbulent clouds

Result 2.1 Relationship between changes in lifting condensation
altitude and the occurrence of turbulent clouds

Cloud
Change

51回

40回

Clouds on highResult 2.1 Relationship between changes in lifting condensation
altitude and the occurrence of turbulent clouds

turbulent cloud
Cloud
Change

28回

18回

Liftingcondensation
altitudechanged morethan 200m

Discussion 2: Relationship between changes in lifting condensation
altitude and the occurrence of turbulent clouds

Before turbulence clouds develop.
Lifting condensation altitudes are higher because
higher than turbulent clouds.
Tendency to have higher clouds than turbulence
clouds before turbulence clouds develop

結果3

Change in wind direction during
turbulent cloud development

Result 3: Change in wind direction during the occurrence of turbulent
cloudswind direction north▶「1」wind direction northeast▶「8」
We checked every
10 minutes.

Analysis 3: Change in wind direction during the occurrence of
turbulent clouds

Turbulentcloudsdisappear
Occurrenceof turbulent
cloudsresult３ Change in wind direction during turbulent cloud development

Before and after the occurrence of turbulent clouds,
about 80% or more of the time, the wind directionchanges dramatically.（90° or more）
There is little trend in the changing wind direction.

Consideration 3: Change in wind direction during the occurrence ofturbulent clouds

Changes in atmosphericpressure

When clouds occur.
Changes in updrafts anddowndrafts

onThe wind directionchanges.

結論と今後の展望１

Organize andanalyze data toidentify trends

Not fully
understanding
the physicalfactors

Consider fluid
motion andtopography

now

future結論と今後の展望２
now

Clouds have not been observed at night.

Research and investigation of cloud
observation methods at night

futureLong-term cloud observations

Observation using
sanitary observationimages

References● 浜島書店編集部（2013年）「ニューステージ地学図表」浜島書店● “持ち上げ凝結高度の計算式”.01/15/2006.
http://es.ris.ac.jp/~nakagawa/met_cal/lcl.html.(06/21/2022)● 国土交通省気象庁.“過去の気象データ検索”福井地方気象台.毎秒更新.https://www.data.jma.go.jp/obd/stats/etrn/index.php?prec_no=&b
lock_no=&year=2022&month=&day=&view=.(02/08/2023）● 国土交通省気象庁.“Naha Aviation Weaher Station”.那覇航空測候所.
10/18/2022.https://www.jma-net.go.jp/naha-airport/kansoku/ceilo/ceilo.html(06/09/2022)