TITLE: Council 2000 forest sapflow data AUTHORS: Dr. Jason Beringer # Dr. F.S. Chapin III @ Catherine Copass @ # School of Geography and Environmental Science PO Box 11A Monash University Clayton, Victoria, 3800 AUSTRALIA Ph: +61 3 9905 9352 Fax: +61 3 9905 2948 Email: Jason.beringer@arts.monash.edu.au @ Institute of Arctic Biology 311 Irving I Bldg University of Alaska Fairbanks Fairbanks, AK, 99775-7000 USA DATA SET OVERVIEW: There were three flux and climate towers operating at Council, Seward Peninsula, during 2000. Two towers were located at the tundra and forest sites. The third tower was a mobile tower and covered four different surface types (Tall shrub, tundra ISS2, burned tundra, heath and shallow thaw lake). The data presented here is sap flow measurements that provide daily total transpiration of the spruce forest in L/day. This data was collected in conjunction with mini lysimeters to measure soil evaporation and an additional eddy covariance system that was established beneath the forest tower at Council at 2m above the ground. This system measured below canopy fluxes from the ground surface and ground shrubs. The forest tower fluxes and climate can be found in the files 'cfore_2f and cfore_2c' and understorey fluxes in 'fore_und' details of the tower site are given. CFORE - SPRUCE FOREST Location: N 64o 54.456' W 163o 40.469' Elevation: 275 feet Slope: 3.3% (3o) Aspect: 140 o TN Grid orientation (A1-A11): 058o TN Data dates: 13/5-29/8 Average LAI: 2.7 Average vegetation height: 6.1m Sonic Anemmeter:120 oTN Sonic Height: 11.20 m DATA COLLECTION AND PROCESSING: Data were collected at Council (N64o50.499' W163o41.591') on the Seward Peninsula, located approximately 70 miles to the northeast of Nome. The Peninsula itself encompasses a diversity of landscape and ecosystem types created by the various climatic and topographical settings. The climate of the Peninsula is annually slightly wetter and warmer than the north slope of Alaska [Fleming et al. 2000]. In the summer, climate is somewhat continental with relatively cool and windy conditions along the coast with the inland climate being relatively hotter and drier. The Council area provides an excellent field site to investigate a variety of high-latitude ecosystem types that may be important in future climate change in close proximity. It also allowed us to examine what may happen under a changing vegetation regime brought about by future warmer and wetter conditions. Seven different vegetation/surface types were selected for study along a gradient from Heath through to mature white spruce (Picea glauca) forest. The seven sites were termed heath, tundra, burned tundra, replicate tundra ISS2, tall shrub, shallow lake and forest. These sites were located within a 5 km radius of Council. This region of tundra and forest is representative of the contrast in vegetation that may be observed across northern treeline [Lafleur et al. 1992]. Leaf area index (LAI) was measured in these sites at peak season biomass using optical techniques (Licor Inc., model LAI-2000). See Copass data DATA FORMAT: There is only one file that contains sap flow sapflow These files are saved in two formats *.xls being an Excel4 worksheet and *.txt being a comma delineated text file. The files contain one or more of the following parameters and the parameter names are given at the top of each column. The following table gives the parameter definitions. SAPFLOW FOREST JULIAN_D -9999 10.5 Day of year FAIRT2_M -9999 10.5 Air temperature oC at 14m FRH2_MEA -9999 10.5 RH % at 14m FE_MEANS -9999 10.5 Vapour pressure (mb) at 14m FES_MEAN -9999 10.5 Saturated vapour pressure at 14m (mb) FVPD_MEA -9999 10.5 Vapour pressure deficit (mb) at 14m FPAR_MEA -9999 10.4 Photosynthetically active radiation (umol.mol-1.m-2) FRN1_MEA -9999 10.4 Net radiation 1t 17m (Wm-2) FPYR_MEA -9999 10.4 Pyranometer (Wm-2) FRAIN_ME -9999 10.6 Rainfall (mm) FPRESS_M -9999 10.3 Atmspheric pressure (mb) FWS_MEAN -9999 10.6 Wind speed at 20m (m.s-1) FWD_MEAN -9999 10.4 Wind direction true north at 20m FBIOM_1_ -9999 10.6 Tree biomass temperature 2 (oC) FK_DOWN_ -9999 10.4 Incoming solar radiation (Wm-2) FK_UP_ME -9999 10.5 Reflected solar radiation (Wm-2) FL_DOWN_ -9999 10.5 Incoming Longwave radiation (Wm-2) FL_UP_ME -9999 10.4 Outgoing longwave radiation (Wm-2) FWP1_MEA -9999 10.5 Water potential 10cm depth (kPa) FWP2_MEA -9999 10.6 Water potential 10cm depth (kPa) FWP3_MEA -9999 10.6 Water potential 10cm depth (kPa) FWP4_MEA -9999 10.5 Water potential 10cm depth (kPa) FWP5_MEA -9999 10.5 Water potential 10cm depth (kPa) FWP6_MEA -9999 10.6 Water potential 10cm depth (kPa) F_H_MEAN -9999 10.4 Mean daily Sensible heat flux (Wm-2) F_LE_MEA -9999 10.5 Mean daily Latent heat flux (Wm-2) F_G_MEAN -9999 10.5 Ground heat flux (Wm-2) F_FC_MEA -9999 10.6 CO2 flux average daily (mg.g.m-2.s-1) FMEANCO2 -9999 10.4 Mean Co2 concentration FUSTAR_M -9999 10.6 Friction velocity FVTI_MEA -9999 10.6 Turbulence intensity FL_MEANS -9999 10.3 Monin-Obukov length (m) F_BR_MEA -9999 10.5 Bowen ratio daily average F_RA_MEA -9999 10.5 Aerodynamic resistance (s.m-1) F_RC_MEA -9999 10.4 Bulk surface resistance (s.m-1) TRANS -9999 10.3 Transpiration (L.day-1) T_MJ -9999 8.4 Transpiration in MJ.m-2.day-1 LE_MJ -9999 8.4 Latent heat flux in MJ.m-2.day-1 T1 -9999 8.4 Individual tree transpiration rates (L.day-1) T2 -9999 8.4 Individual tree transpiration rates (L.day-1) T3 -9999 8.4 Individual tree transpiration rates (L.day-1) T4 -9999 8.4 Individual tree transpiration rates (L.day-1) T5 -9999 8.4 Individual tree transpiration rates (L.day-1) T6 -9999 8.4 Individual tree transpiration rates (L.day-1) T7 -9999 8.4 Individual tree transpiration rates (L.day-1) T8 -9999 8.4 Individual tree transpiration rates (L.day-1) T9 -9999 8.4 Individual tree transpiration rates (L.day-1) T10 -9999 8.4 Individual tree transpiration rates (L.day-1) T11 -9999 8.4 Individual tree transpiration rates (L.day-1) T12 -9999 8.4 Individual tree transpiration rates (L.day-1) T13 -9999 8.4 Individual tree transpiration rates (L.day-1) T14 -9999 8.4 Individual tree transpiration rates (L.day-1) T15 -9999 8.4 Individual tree transpiration rates (L.day-1) T16 -9999 8.4 Individual tree transpiration rates (L.day-1) T17 -9999 8.4 Individual tree transpiration rates (L.day-1) T18 -9999 8.4 Individual tree transpiration rates (L.day-1) T19 -9999 8.4 Individual tree transpiration rates (L.day-1) T20 -9999 8.4 Individual tree transpiration rates (L.day-1) T21 -9999 8.4 Individual tree transpiration rates (L.day-1) T22 -9999 8.4 Individual tree transpiration rates (L.day-1) T23 -9999 8.4 Individual tree transpiration rates (L.day-1) T24 -9999 8.4 Individual tree transpiration rates (L.day-1) T25 -9999 8.4 Individual tree transpiration rates (L.day-1) T26 -9999 8.4 Individual tree transpiration rates (L.day-1) T27 -9999 8.4 Individual tree transpiration rates (L.day-1) T28 -9999 8.4 Individual tree transpiration rates (L.day-1) T29 -9999 8.4 Individual tree transpiration rates (L.day-1) T30 -9999 8.4 Individual tree transpiration rates (L.day-1) T31 -9999 8.4 Individual tree transpiration rates (L.day-1) T32 -9999 8.4 Individual tree transpiration rates (L.day-1) T33 -9999 8.4 Individual tree transpiration rates (L.day-1) T34 -9999 8.4 Individual tree transpiration rates (L.day-1) T35 -9999 8.4 Individual tree transpiration rates (L.day-1) T36 -9999 8.4 Individual tree transpiration rates (L.day-1) T37 -9999 8.4 Individual tree transpiration rates (L.day-1) T38 -9999 8.4 Individual tree transpiration rates (L.day-1) T39 -9999 8.4 Individual tree transpiration rates (L.day-1)