Summary


Personnel Involved

Principle Investigator: Rich Vong(vong@ats.orst.edu)

OSU Personnel: Andy Kowalski(andyk@ats.orst.edu) and Peter Anthoni(panthoni@oce.orst.edu).

ASTER Project Scientist: Tony Delany.

ASTER Project Engineer: Steve Semmer.

ASTER Personnel: Tom Horst, Kurt Knudson, Gordon Maclean, Charlie Martin, John Militzer, Santiago Newbery, Steve Oncley, Lou Verstraete(louvers@atd.ucar.edu).

Location of CACHE94 Field Site.

The ASTER facility was deployed at the Cheeka Peak cloud observatory, on the north-west extremity of the Olympic peninsula of Washington (See Figures 1 and 2).

Under many synoptic conditions this mountain-top site receives clean oceanic air advecting from the open Pacific ocean. Other conditions lead to off shore winds resulting in exposure to continental air and, on occasion, to polluted air from the Seattle urban area. Lower level air flow from the Seattle area along the Straits of Juan Fuca sometimes results in polluted air flowing out to sea and then returning on the westerly air flow.

The CACHE94 research site was located at latitude 124° 37' 30''W, 48° 17'' 56''N at an elevation of 463 meters, 4 kilometers inland from Anderson Point. The Makah Bay, Washington quadrangle of the 7.5 minute U.S.G.S. topographic map shows the topography to the west of the research area. (See Figure 3). The research site occupied the flat crest of the end of the south-extending ridge of Cheek Peak. From the ridge top the terrain falls off steeply to the east, south and west with slopes approaching 30°.

The slopes are forested with a mixture of coniferous trees and evergreen shrubs. A transect was made by Lee Klinger of the Atmospheric Chemistry Division of NCAR from the ridge-top upwind and down the slope to the west. Figure 4 illustrates the height and leaf area distribution along the transect to the west. These data are tabulated in Table 1.

Table 1 Mean heights and leaf areas
Silver Fir Western Hemlock Red Cedar Salal
Distance Height Leaf Area Height Leaf Area Height Leaf Area Height Leaf Area
m m m^2m^-2 m m^2m^-2 m m^2m^-2 m m^2m^-2
10 4.60 5.00 5.00 1.10 0.00 0.00 1 2.99
20 5.94 18.00 4.00 3.02 0.00 0.00 1 3.31
30 7.21 13.38 6.30 1.15 0.00 0.00 1 5.59
40 6.63 7.99 8.00 2.02 0.00 0.00 1 6.97
50 8.40 16.13 5.70 8.62 0.00 0.00 1 0.71
60 5.77 12.37 4.50 0.59 0.00 0.00 1 7.71
70 5.70 6.84 6.70 1.95 0.00 0.00 1 7.60
80 5.90 5.62 6.20 6.64 6.30 2.66 1 5.26
90 7.40 17.87 7.10 10.69 4.00 0.63 1 0.78
100 9.74 21.31 10.00 5.62 0.00 0.00 1 1.79

Dates of Field Program

Equipment arrived at the field site on 25 July 1994

Setup and checkout from 25 July until 8 August 1994.

Operational period 8 August - 23 September 1994; julian days 214 - 266

Tear-down commenced 24 September 1994.

Table 2 Field program dates
Operations Julian Day day:month:year Day
Arrival 206 25 Jul 1994 Mon
Set-up and check-out 206-214 25 Jul - 2 Aug 94 Mon - Tues
Operations Start 214 2 Aug 94 Tues
ops 1 214 - 218 2 - 6 Aug 94 Tues - Sat
ops 2 218 - 221 6 - 9 Aug 94 Sat
ops 3 221 - 224 9 - 12 Aug 94 Sat - Fri
ops 4 224 - 227 12 - 16 Aug 94 Fri - Tues
ops 5 227 - 228 16 Aug 94 Tues
ops 6 228 - 231 16 - 19 Aug 94 Tues - Fri
ops 7 231 - 235 19 - 23 Aug 94 Fri - Tues
ops 8 235 - 256 23 Aug - 13 Sep 94 Tues - Tues
ops 9 256 - 260 13 - 17 Sep 94 Tues - Sat
ops 10 260 - 266 17 - 23 Sep 94 Sat - Fri
Teardown start 267 24 Sep 94 Sat


Last Modified: 13:45pm MDT, July 4, 1996