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GEO GI: weather and climate, Post-Fieldwork: Presenting Weather Data,…
GEO GI: weather and climate
recording sheets
facilitate the recording of data
on fieldwork site
need to be prepared prior to fieldwork investigation
can be restrictive
as categories are predetermine
affects reliability
the data does no belong to any
can record any anomalies in blank space
maps
essential primary source
in any fieldwork investigation
show location of physical features and human activities
can infer
how the physical and human environments interact with each other
annotated
locations of recorded data
further data analysis and presentation can be carried out after fieldwork has been done
Cloud Cover
"it" indicates the amt of solar radiation that reaches the earths surface
0 - sky completely clear
4 - sky half cloudy
8 - sky completely cloudy
9 - sky obscured from view
air pressure
measured in
millibars (mb)
measured using
barometer
2 needles
connected to
insides
known as
measuring hand
shows the pressure
2nd needle
movable needle
that turns when a knob in the centre of the glass is twirled
turned to
align over the measuring hand
to mark the current pressure
moves according to air pressure
pressure - falling
moves to left
rising
moves to right
avoid
direct sunlight
metal cell can heat up
and expand
placing it in
draughty places
ei
door/ window
air pressure is too variable
thermometer
type
max and min ther
diurnal temp range - 6
max - 30
not 20 or 35
min - 24
six's ther
u-shape ther
placed in
Stevenson screen
kept out of direct sunlight
as the sun's energy would be absorbed
prevent higher temp than true air temp
1.5m above ground
minimise effects of heat radiation from ground
ground absorbs heat
open area away from buildings
where air can circulate freely
do not
hold the glass bulbs
fingers are warm
ensure it is
vertical
and
read meniscus at eye level
to minimise
parallax error
records
max and min temp of day
relative humilidy
sling psychrometer/ hydrometer
wet and dry ther and a wick
siting the instrument
avoid
direct sunlight
when using
heat
incr reading
describe and explain
STEPS
soak wick of the wet bulb
with water
so that
when swung,
water from the wick gets evaporated
and cooling occurs
dont hold wick with hands
oil from hands may affect
evaporative characteristics
of the instruments
keep it far enough from our bodies and face it into the wind
to minimise effects of heat radiation from the body
swing it at a steady pace
2 turns per sec
1 min
stop and read the wet bulb temp first to prevent temp drop from further cooling
calculate diff bwt dry and wet bulb temp.
relative humidity chart
rainfall
rain gauge
funnel + jar
siting the instrument
open area
away from buildings and trees
as it might intercept the rain
from reaching the rain guage
protected from wind
wind may blow the rain past the rain guage
leading to an underestimation of rainfall
describe and explain steps
sink 'it' into the ground
prevent it from falling
ensure stability
30cm protrudes above the ground
prevents rain splashing into 'it'
resulting in overestimation of rainfall
monitoring the duration
start to end time
of rain events
minimise overflow of H2O from 'it'
due to H intensity rainfall event
check every 24hr
pour collected rain into measuring cylinder
read meniscus at eye level to minimise parallax error
record in millimetres
Post-Fieldwork:
Presenting Weather Data
simple line graph
weather element
wind speed over time
altitude over pressure
temp over time
Advantages
show trends over time
used to estimate future patterns
easy comparison of multiple sets of data
simple Bar graph
weather element
rainfall
scatter graph
used for
relationship bwt 2 sets of data
no need start from (0,0)
best fit line
drawn bwt pts
shows relationship bwt 2 sets of data
anomalies are easily identified
advantage
indirect
relationship
direct
relationship
no
relationship
x-axis
independent variable
y-axis
dependent variable
wind rose
used for
wind dir
not a weather instrument
8 branches
corresspond
to main compass dir
no in mid
clam days
advantage
able to show
no of
daily wind dir
clam days
prevaling wind dir
within the period of investigation
/ month
recording observations
photographs
sketches
for future reference
annotations
highlight essential info
