August 10, 13:50
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, no ISFS staff on site
clear overnight and cool, mostly sunny to partly cloudy daytime with light and variable winds under the influence of a surface high pressure
Vdsm: 13.4-13.7 V during day, down to 12.4 at night
P: ok, rising pressure overnight from 970 to 975 mb by 11:00; falling in the afternoon
T.2m: stn1 about 0.5-1.5 degrees warmer than other sites from 23:00-3:00 and from 4:00-7:00, stn2 about 1.0 degree C cooler than stns 3-4 from 1:00-2:00
RH.2m: night: stn 4 about 2-5%RH higher than stns 2-3 and about 5-7%RH higher than stn 1 from 21:30 to 2:00, later in night stn4 within a few%RH higher than other sites; slightly lower %RH at stn 3 vs. 4 during the afternoon
H2O.2m: night: stn 2 about 0.5-0.7 g/m^3 less vapor than other sites much of the night and up through 8:30; daytime: stn 4 slightly more moist than other sites
Wetness: dew formation from 0:00 to 7:45, sensor dry by 9:15
T.10m: ok, similar to T.2m for stn1 pattern during the overnight
RH.10m: stns 1-2 about 305%RH lower than other sites from 22:30-2:30, stn 2 about 5-7%RH lower than other sites from 3:00-7:30, agreement with other sensors 10:00; stn4 slightly drier than other sites in afternoon
H2O.10m: night: stn 2 about 1.0-1.5 g/m^3 drier than other sites, day: stn 2 about 0.5 g/m^3 drier than other sites until 9:30, stn 4 slightly drier than the other sites in the afternoon
Spd.10m: ok, stn1 about 1-1.5 m/s higher speed than other sites, stns 2-3 about 0.5 m/s lower than stn 4 from 21:30-0:00, other parts of night stns 2-4 remain at least 1.0 m/s lower than stn 1; day: good agreement among sites
Dir.10m: ok, mostly NW winds during the night and daytime; few periods of westerlies around 3:00-4:00 and from 7:00-7:30
T.10m - T.2m: night: stn2 about 0.5 degrees C warmer at 10 m vs. 2 m from 0:00-1:30; good daytime agreement
H2O.10m - H2O.2m: stns 1 & 3 mostly agree for day and night, stn 2 about 0.5-1.0 g/m^3 drier at 10 m vs. 2 m much of the night and up through 10:00, close agreement with stns 1 & 3 after that; stn 4 about 0.5 g/m^3 drier at 10m vs. 2m most of the night and during the daytime
spd.4.5m: ok, similar for Spd.10m,
dir.4.5m: ok, see comments for Dir.10m
w.4.5m: ok, most of the night stn 4 has largest downward velocity w<0, stns 2 & 3 slightly positive motion for same night period stn 4, similar pattern in mid morning then stn 1 & 3 are more negative in afternoon and stns 2 & 4 are slightly positive
tc.4.5m: ok, similar pattern to T.2m
ldiag: ok, spiked values at stn2 are quite low, few 100 samples missing at stn 2-4 in the overnight hours
kh2oV: ok, near 300-500 mV in the daytime
kh2o: night: stns 2&4 about 5-6 g/m^3 wetter than stns 1 & 3 for the overnight; day: stn4 about 1.5 g/m^3 wetter than stn 2 and about 5.0 g/m^3 more moist than stns 1 & 3
h2o(licor): ok, stn 1 about 0.5 g/m^3 drier than stn 3 from much of the night; close agreement by 11:00
lidiag (licor): ok, spikes during period of dew accumulation
TKE.4.5m: ok, stn 1 about 0.15-0.2 m^2/s^2 greater than other sites much of the night from 22:00-7:00
w'w': ok, similar to TKE.4.5m, also close agreement with u'u' and v'v'
u*: ok, similar to TKE.4.5m from also seen in u'w' and v'w'
w'tc': ok, night: larger negative heat flux by 0.02 C m/s at stn 1 as in u* especially from 23:00-2:00; good daytime agreement
tc'tc': ok, somewhat higher temp variance noted from 23:00 to 1:30; no big differences during the daytime
w'h2o': ok, slightly higher positive flux at stn1 from 22:30-1:00 where other sites have near-zero flux; daytime: stn 2 a bit drier than other Sites
h2o'h2o' (licor): ok, some spikes in data during the night; close agreement with other sites after 5:30-6:00
kh2o'kh2o': night: few spikes in the data, mostly in agreement with licor; day: slightly less variance at stn 2 & 4 vs. 1 & 3 but this might be related to differences in sensor types
w'co2': ok, night: much of the night less positive flux (2-3*10^-5 g/m^2/s) at Stn 3 vs. Stn 1; slightly higher co2 uptake at Site 1 vs. Site 3 during the afternoon
co2'co2': ok, slightly higher variance at stn 1 vs. stn 3 during the night, close agreement among sites during the day