July 8, 18:16 CDT
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, Kris and Dan serviced sites 2,4 to clean krypton sensors;
after the lens cleaning vh2ov above 100 mV for stn 2,4;
means and variances of kh2o also reasonable;
mostly clear skies in overnight, visibility reduced to 1-2 mi for 1.5 hours before/during sunrise, daytime cumulus;
winds from ENE to WSW during night, westerly mid morning, variable direction much of afternoon
Vdsm: 13.5-13.8 V during day, down to 12.5 at night
(why are there sharp drops (to 13.0 V) at stn 3 around 16:50 and 17:50?)
P: ok
T.2m: ok, stn1 about 1.0 degree warmer than stns 2-4 5:30 to 6:30 (also sensor has
moisture spike around this time but not at other sites)
RH.2m: 85-100% nighttime; 55-65% day
much of overnight stn 2 and 4 agree about 2-3% RH higher than stn 1 and 3, mid morning stn 1 few% RH lower than other sites
H2O.2m: ok
Wetness: sensor response to dew around local midnight
wetness accumulation through 7:00; sensor dry by 9:30 CDT
T.10m: ok, stn 2 and 4 similar nighttime temp (0.5 degree cooler than stn 1 and 3) between 5:00-6:30
RH.10m: ok, stn 2 about few%RH higher than other sites from 2:00 to 5:00
H2O.10m: ok see comments with RH.10m
Spd.10m: ok, is there a weak jet influencing the sfc from 2:30-5:30?
Dir.10m: ok, ENE to WSW winds in night-mid morning, back to N to NE in late afternoon/evening
T.10m - T.2m: ok, similar at all sites in most of daytime
H2O.10m - H2O.2m: ok, stns 2 and 4 1-2% higher vapor concentration (drier at 10m vs. 2m) than sites 1,3 from 0:00-2:00 CDT
spd.4.5m: ok, stn 1 about 0.5 m/s higher than other sites during 4:30-5:30 and also 8:15-8:45
dir.4.5m: ok, larger nighttime variations noted at 4.5 vs. 10 m from 3:00-7:00 CDT
w.4.5m: ok, stn 3-4 more w<0 from 1:00-2:00 than other sites (during time of more easterly turbine wakes at stns 1-2)
tc.4.5m: ok, stn 2 about 0.5-0.75 degree cooler than stns 1,3-4 from 1:30-5:30
ldiag: ok
vh2ov: ok, after cleaning sensor lenses
stn 2 went from about 120 mV to 230 mV after cleaning
stn 4 went from about 10 mV to 175 mV after cleaning
kh2o: ok, after cleaning
stn 4 back within levels of other sites
h2o(licor): ok, btwn 15-19 g/m^3 for night to day behavior
lidiag (licor): ok, some warnings at stn3 from 5:00-6:30
TKE.4.5m: ok,
w'w': ok,
u* : ok
w'T' : ok, stn4 less positive heat flux in much of daytime (corn stage more mature than at stns,1-2, more LE?)
stn 4 max of 0.09 C m/s, stn 3 max of 0.14 C m/s, stns 1,2 ~0.10-0.12 C m/s
w'h2o': ok after cleaning sensor at sites 2,4
h2o'h2o': ok, stns 1,3 mostly in agreement
kh2o'kh2o': ok after cleaning the sensors; high variance in morning during dew/fog
w'co2': ok, stn 1 & 3 are in close agreement most of the diurnal period
co2'co2': ok