Water Vapor Data Sheet

School Name: _________________________ Study Site ATM-__________________________

Date on which the measurements were taken: _________

Observer names: ______________________________________________________

For Satellite overflights on date of measurements:

Satellite/instrument name: __________ Time of overflight (UT): ________ Max elevation angle (deg): _____

GLOBE/GIFTS Water Vapor Instrument serial number: __________________

Fill in the first five columns of this table and report your data to GLOBE. GLOBE will provide you with calculated values for precipitable water, which you then record in the sixth column.

Case temperature before taking measurements (multiply voltage reading times 100) ____deg C
Measurement
Number(1) 		Local Time(2)
(hrs:min:sec)		 UT Time(3)
(hrs:min:sec)		 Maximum Voltage
in Sunlight(4) (volts)		 Dark Voltage(5)
(volts)		 Precipitable
Water(6) (cm)
1 (IR1)
1 (IR2)
2 (IR1)
2 (IR2)
3 (IR1)
3 (IR2)
4 (IR1)
4 (IR2)
5 (IR1)
5 (IR2)
Case temperature after taking measurements (multiply voltage reading times 100)____deg C
(1) At least three sets of measurements are required.
(2) Ideally, time should be reported to the nearest 15 seconds, using an accurately set timepiece.
(3) Be careful when converting local time to UT.
(4) Always report voltages with 3 digits to the right of the decimal point. For example, 1.773 rather than 1.77.
(5) Enter dark voltage in units of volts, not millivolts. For example, 0.003 V rather than 3 mV.
(6) These values are calculated from your data and provided by GLOBE.

Cloud and contrail conditions (If sky not obscured, check the box for each cloud or contrail type you observe
and check one box for cloud or contrail cover amount.)

Cloud Type
Cirrus __
Cirrostratus __
Cirrocumulus __
Altostratus __
Altocumulus __
Stratus __
Stratocumulus __
Cumulus __
Nimbostratus __
Cumulonimbus __
Cloud Cover (%)
No clouds (0%) __
Clear (0% - 10%) __
Isolated (10% - 25%) __
Scattered (25% - 50%) __
Broken (50% - 90%) __
Overcast (90% - 100 %) __
Obscured __
Contrail Type
Short-lived __
Persistent spreading __
Persistent non-spreading __
Contrail Cover (%)
0% - 10% __
10% - 25% __
25% - 50% __
>50% __

Sky Conditions (Check one box in each table, as appropriate.
Sky conditions can be checked only if sky not obscured.)

Sky Color
Deep blue __
Medium blue __
Light blue __
Pale blue __
Milky __
Sky Clarity
Unusually clear __
Clear __
Somewhat hazy __
Very hazy __
Extremely hazy __
Sky obscured by:
Fog __
Smoke __
Haze __
Volcanic ash __
Dust __
Sand __
Marine spray __
Strong rain __
Strong snow __
Blowing snow __

Current air temperature:_____ °C
Source (You must select one.):
GLOBE Protocol Online, broadcast, or print source other thermometer

Relative Humidity: __________ %
Source (You must select one.):
GLOBE Protocol — hygrometer GLOBE Protocol — sling psychrometer Online, broadcast, or print source

If you used a sling psychrometer:     Dry bulb temperature:________ °C     Wet bulb temperature:________ °C
Note: Current air temperature and dry bulb temperature should be similar.

Barometric pressure (If you leave this blank, GLOBE will calculate it.): _____________ mbar
Reference (If you have entered a value, you must select one of these.):
Sea level pressure Station pressure
Source (You must select one.):
GLOBE Protocol — Calibrated classroom barometer Online, broadcast, or print source Let GLOBE calculate it.

Comments: Describe conditions that could affect your measurements, such as urban smog, smoke from forest fires, blowing sand, or dust from agricultural activities.
Also, include air temperature and relative humidity.

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