!■■ ■ !■ ' ' ' I ' ' I ' 



10 Day means 



;:n.a -- 



i 



-8.0 



M ....t...-l " .-l---'l- " -l "" l' ■■■ I ■ ■■•l "" l " --l- 



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' i I I ■ " ■ I ' ■ " t ' ■ " t ' ■ " I j" " I " " ) ' ■ ' ■ t " " I ' ■ ■ ' I " 

 10 15 eo ?S 10 S 10 15 20 2S 



JUNE TO 



I 



JUL! TO 



9 lij 19 



AUGUST 70 



Figure 8. Daily minimum, maximum and mean air temperatures, Barrow, Alaska. 



July. Continuous gaging of runoff in the east fork of Footprint Creek was available through a dam 

 and a Pascal flume. This nearly total lack of runoff during the summer compared with the summer 

 of 1964 which was also extremely dry and cool and during which runoff was nil. 



Micrometeorology 



Gunter Weller* 

 Dennis Trabant 

 Gilbert Mimken 

 John Kelley 

 Gerd Wendler 

 Vaughn Rockney 



University of Alaska 

 University of Alaska 

 University of Alaska 

 University of Alaska 

 University of Alaska 

 USA CRREL 



The 1970 micrometeorology program began with the summer season. Therefore, the objectives 

 were to determine the energy fluxes and the distribution of energy within the three-layer system: 

 air/vegetation/soil. This program was extended to a four-layer system to include snow beginning 

 in the fall 1970. Three vertical levels of measurements were made to evaluate radiative, conductive 

 and convective transfer processes in the near-surface tundra environment: 



1) Near-surface atmosphere: A 16-m tower was installed at site 2 in early June. Values of 

 wind speed and direction and ventilated air temperatures were measured at 1, 2, 4, 8 and 16 m above 

 the surface. The sensors were provided by the USA Natick Laboratories. 



2) Plant canopy: Ventilated thermocouple sensors installed in copper tubes placed at 0, 2.5, 5, 

 10 and 15 cm above the soil surface and within the canopy were placed in several control plots and 

 manipulated treatments. Figure 9 illustrates one of these units, which employ a small d-c blower 

 motor. Radiation extinction was monitored at similar vertical intervals through the use of photocells. 



3) Soil temperatures: Temperatures were measured with thermocouples to a depth of 1 m. 



At site 2, micrometeorological data acquisition was on a paper tape data logger at hourly inter- 

 vals. During periods of malfunction, data were collected on multipoint strip chart recorders. 



♦Principal author. 



17 



