GEOG 5231/4231 - Fall 2001
Professor Konrad Steffen
CIRES Ekeley Building, S264
Tel o: 492 4524; h: 494 6276
e-mail koni@seaice.colorado.edu
Field Excursion I
Rocky Mountain Research Station - Niwot Ridge
26-28 October 2001
Calibration
data Profile
data Ground
data
Objectives
· Calibration of
temperature, humidity and wind sensors
· Evaluation of temperature,
humidity and wind
· Evaluation of radiative
fluxes
· Evaluation of conductive
fluxes
· Introduction to
convective fluxes; aerodynamic method
Friday
The method for instrument
calibration in the field will be demonstrated (Friday). The temperature,
humidity and wind instruments will be mounted on met-towers, connected
to 21X or 10X dataloggers and measured for a period of at least 12 hours
(through the night).
Saturday & Sunday
Radiation sensors will be
mounted on met-towers and connected to 21X or 10X data loggers. The
different radiative fluxes (short-wave in, short-wave out, longwave in,
net and direct solar radiation will be recorded for at least 24 hours.
In addition, the surface temperature will be recorded with a radiation
thermometer. These measurements will be used to discuss the diurnal
variation of the different radiative fluxes, and the short-wave and longwave
radiation balance will be derived.
The thermistors will be place in the soil at different depth, connected to a 21X or 10X datalogger, and the recordings used to calculate the conductive heat flux.
Introduction to the aerodynamic method to measure convective energy fluxes. The instrumentation will be mounted at three levels (profile method) and connected to a 21X or 10X datalogger. Recordings will be made for short periods, depending on time and weather.
Personal equipment
Food and drinks (not too
much alcohol!) for 3 days
Warm clothing for outside
work at 3000 m altitude (it could be sub-freezing)
Waterproof boots for hike
to tundra lab through snow, gloves, hat
Sunscreen, sunglasses, waterproof
wind-jacket and backpack
Sleeping bag and mattress
for Niwot Ridge tundra lab overnight (3500
m)
Waterproof field book, flashlight,
your personal first aid kid
Departure: Friday at 13:00
from CU
Return: Sunday before 18:00
at CU
