August 11, 15:15
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, no ISFS staff on site, Russ and Dan serviced the south wind cube to replenish fuel
overnight: clear skies, cool, very low wind; daytime: mostly sunny with light winds from the southwest by the afternoon
**Turbines were not turning during the mid morning hours
Vdsm: 13.4-13.7 V during day, down to 12.4 at night
P: ok, rising pressure overnight from 973 to 976 mb by 12:00; falling in the afternoon
T.2m: stn1 about 1.0 degrees warmer than other sites most of the night; stn 2 about 0.5 degrees C cooler than stns 3-4 from 23:30-6:00; daytime close agreement up to 10:00; stns within +/- 0.5 degrees C of each other rest of afternoon
RH.2m: night: stn 4 about 5%RH higher than other sites from 22:00-6:00; close morning agreement stn 3 about few%RH lower than other sites in the afternoon
H2O.2m: night: stn 4 about 0.7-1.0 g/m^3 more vapor than other sites much of the night; close agreement at all sites in early-mid morning; stn4 about 0.5 g/m^3 wetter than other sites in the afternoon
Wetness: sensor wet from 22:00 to 9:30; dew formation stops around 7:30
T.10m: ok, most of the night all sites are within 0.5 degrees of each other, stn1 about 1.0 degree C warmer than stns 3-4 from 22:00-23:00, and from 4:00-6:30
RH.10m: stn 1 about 5%RH lower than stns 3-4, stn 2 about 3%RH lower than stns3-4 for much of night; good daytime agreement but a few%RH lower at stn4 vs. other sites
H2O.10m: night: stn 2 about 0.5-1.0 g/m^3 drier than other sites, day: stn 2 about 0.5 g/m^3 drier than other sites until 9:00, stn 4 slightly drier 0.5 g/m^3 than the other sites in the afternoon
Spd.10m: ok, winds very light (< 3 m/s) stn1 slightly higher speed than other sites a few times of the night, day: good agreement among sites, early to mid afternoon stn 4 slightly lower than stn 3
Dir.10m: ok, mostly WNW to W winds during the night; direction backing to WSW and eventual SW by mid afternoon
T.10m - T.2m: night: stn1 about 1.0-1.5 degrees C cooler at 10 m vs. 2 m from 21:00-22:00, near 1:00, and from 4:00-5:00; stns 3 & 4 a bit higher temp at 2m vs. 10 m as compared to other sites for the late morning and early afternoon
H2O.10m - H2O.2m: night: stn 3 about 1.0 g/m^3 more moist at 10 m vs. 2 m than at stn 4, other sites in between; late morning through the afternoon: stn 4 about 1.0-1.5 g/m^3 drier than other sites
spd.4.5m: ok, similar for Spd.10m, a bit more organized longer periods where stn 1 has 0.5-0.7 m/s faster speed than the other sites
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
tc.4.5m: ok, stn 2 about 1.0-1.5 degrees cooler than stns 3-4, about 2-2.5 C degrees cooler than stn 1 for several night periods; daytime good agreement, slightly cooler at stns 1-2
ldiag: ok, spiked values at stn2 are quite low, few 100 samples missing at stn 2 from 3:00-6:00
kh2oV: ok, between 300-600 mV for night to day behavior
kh2o: night: stn 2 had a spike (dew-related causal for low voltage?) around 5:30-6:30, stns 2 & 4 about 5-6 g/m^3 wetter than stns 1 & 3 for the overnight; both Sites 2 & 4 about 3-5 g/m^&3 more moist during the morning/afternoon
h2o(licor): ok, stn 1 about 0.5 g/m^3 drier than stn 3 from much of the night; close agreement by 12:00
lidiag (licor): ok, short duration of spikes noted at 6:00 and also in afternoon for Site 1
TKE.4.5m: ok, sites mostly in agreement, slightly higher TKE at stn 1 from 21:00 to 22:30; good daytime agreement
w'w': ok, similar to TKE.4.5m, (stn 1 about 0.02 m/^2/s^2 higher as noted for TKE.4.5m), no significant differences in u'u' or v'v'
u*: ok, similar to TKE.4.5m from 21:00-22:30, but other periods of Site separation stn 4 about 0.05 m/s higher than stn 1 from 2:00-3:30'; fairly close daytime agreement
w'tc': ok, night: larger negative heat flux by 0.02 C m/s at stn 1 as in u* especially from 21:00-22:30; good daytime agreement, stn 3 slightly higher peak flux than other sites, stn2 slightly lower than other sites
tc'tc': ok, larger temp variance for stns 1-2 vs. 3-4 much of the night; daytime: stn 4 a bit higher variance than other stations
w'h2o': ok, stn 2 slightly more negative flux than other sites during sunrise to 1hr later; stn 3 has highest peak water flux of all sites about 0.04 g/m^2/s more than stns 2 & 4
h2o'h2o' (licor): ok, stns 1 & 3 about 0.5 (g/m^3)^2 greater variance than at stn 2 & 4 in the afternoon
kh2o'kh2o': night: few spikes at stn 2; daytime: stn 2 about 0.25 units less variance than stn 4 for much of late morning and afternoon
w'co2': ok, night: more periods of fluctuating positive night time fluxes for Site 1 vs. Site 3; close daytime agreement
co2'co2': ok, higher variance of co2 at stn 1 v.s stn 3 for several periods in the night; Daytime differences in variances are negligible