August 2 15:14 CDT
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, Jimmy and Dan visited the sites to clean krypton sensors at stn 2 & 4 and check bug screens on the 2m TRH inlets at all the sites
**Stn 3 T.2m appears to be back in agreement with other sites as of 0:00 overnight (two moths were in the screen underneath the inlet tube and were removed around 12:05)
Cold Front passage at 11:00, strong southerly flow and likely nighttime jet replaced by more gusty westerly and north-westerly wind
(Turbines at 9:00 were completing one revolution every 3 sec, before inversion breakup completed, one revolution took about every 6 sec around 10:30)
Vdsm: 13.4-13.7 V during day, down to 12.4 at night
P: ok, pressure falling from 973-967 mb during the night and up to 11:00, steady after that
T.2m: night: stn 1 about 1.0 degrees cooler than stn 3 1-2 hrs before midnight, other sites in between 1 & 3; stn 4 about 0.5 degree C cooler than other sites from 1:00 to 8:00; good agreement after inversion breakup completed
RH.2m: stn 4 about 3-7% RH higher than other sites much of the night and morning; stn 3 about 5%RH lower than stns 1-2 from 21:00-0:00; late morning stn 4 about few%RH higher than other sites
H2O.2m: night: stn 4 about 1.0 g/m^3 higher than at other sites much of the night from 22:00-7:00; during and after inversion breakup: stn 4 about 0.5-0.7 g/m^3 more moist than other sites
Wetness: dew event from 21:30 to 1:00, sensor mostly dry by 3:00 but completely dry by 13:00 (small lingering moisture effects?)
T.10m: night: stns mostly in agreement during the night, from 22:30-23:30 site 3 about 0.7 degrees C warmer than stn 1, other sites in between; good agreement between sites during daytime hours
RH.10m: most of night and early morning: stn 2 about 10 %RH lower than the other sites (is this a unphysical signal?), yet all sites have close agreement after inversion breakup
H2O.10m: night: stn 2 about 1.0-1.5 g/m^3 drier than other sites, stn 1 slightly drier than stns 3 & 4; stn 2 delayed agreement with other sites 9:00, stns 1,3-4 agree by 7:30
Spd.10m: ok, stn 1 most of the night about 0.5-1.0 m/s lower than other sites except for agreement around 1:00-2:00, stn 3 also slightly lower than stns 2 & 4 during much of the night; good daytime agreement (also see when towers at Sites 2 & 4 were lowered)
Dir.10m: ok, mostly SSE before 1:00 and near S from then until 1 hr after sunrise, then SW by 10:30, WSW by 11:00 (inversion breakup completed) and W to WNW by mid afternoon, trending to NW by early evening
T.10m - T.2m: night: stn 4 sometimes slightly warmer at 10 m vs. 2 m; early afternoon stn 4 slightly warmer at 2 m vs. 10m than at other sites
H2O.10m - H2O.2m: near zero gradient much of the night at Sites 1 & 3, stn 4 about 1.0 g/m^3 less vapor at 10m vs. 2m, and stn 2 about 1.50-2.0 g/m^3 less at stn 2 vs. stn 4; late morning through early afternoon stn 4 is about 2.0 g/m^3 more vapor at 2 m vs. 10 m than for other sites
spd.4.5m: ok, similar for Spd.10m, wind around 2-3 m/s (except at stn 1) most of the night; good daytime agreement
dir.4.5m: ok, see comments for Dir.10m, more SE to SSE wind during the night than at 10m, SSW by 11:00 and WSW by 12:00, W by 13:30, also will be trending NW or WNW by early evening
w.4.5m: ok, no clear pattern stands out among sites, but variations between sites do occur and change in time
tc.4.5m: ok, night: from 22:30-23:30 stns 1-2 are about 1.0 degrees C cooler than stn 3 and about 0.7 degrees C cooler than stn 4, rest of night most stns are less than +/- 0.5 degrees C; late morning and afternoon stns 1-2 slightly lower temperature than at Sites 3-4
ldiag: ok, 300 samples missing at Site 4 during the night, less than 100 samples missing with sites 1 & 3
kh2oV: stns 2 & 4 50-70mV during the night, around 100-150mV before lenses were cleaned, peak voltage of ~250mV, back down to 150-175 mV by late afternoon
kh2o: stn 4 about 1.5 g/m^3 more moist than stn 2 and about 3.5-4.0 g/m^3 wetter than stn 1 &3 during night; closer agreement between Sites 2 & 4 after lens cleaning but readings are still 2 g/m^3 drier than at stns 1 & 3
h2o(licor): ok, stn 1 about 0.5-0.7 g/m^3 drier than stn 3 from 22:00-9:00; after inversion breakup sites 1 & 3 are within +/- 0.5 g/m^3 of each other
lidiag (licor): ok, no spikes in data
TKE.4.5m: ok, most of night stn 1 about 0.1-0.15 m^2/s^2 less TKE than other sites except from 1:00-2:30, stn 2 & 4 slightly more TKE than stn 3 most of the night
w'w': ok, similar to TKE.4.5m, also in u'u' and v'v'
u*: ok, stn 1 reduced u* by ~0.1 m/s as similar to TKE.4.5m, slightly less also at stn 3 from 2:30-4:00, also seen in v'w', but not in u'w'
w'tc': ok, night: stn 4 about 0.02 to 0.05 m/s C larger negative flux than stn 1, other sites in between 1 & 4; mid morning stns 1-2 slightly less positive flux than stns 3 & 4; afternoon stn 3 peak flux a bit higher (0.02 m/s C) than other sites
tc'tc': ok, night: higher variance at stns 3-4 vs. stns 1-2 from 21:00-0:00 after that about same variance scatter at all sites; mid morning stn 3 about 0.02 C^2 more than at stns 1 -2, stn 4 in between, close agreement after 11:30 with the frontal passage
w'h2o': ok, overnight: stn 3 about 0.004 g/m^2/s higher positive flux before midnight than at other sites, after 1:00 stns 1 & 3 are about 0.002 g/m^2/s greater than stns 2 & 4 has similar positive flux to stn 3 & 4 during 23:00-1:00 about 0.005 g/m^2/s higher than at site 1, daytime: stns 1 &3 about 0.04-0.06 g/m^2/s larger positive flux than other sites
h2o'h2o' (licor): ok, , few spikes at 1 during night, before midnights stn3 slightly higher variance than stn 1 after 2:00, pattern reverses; stn 1 & 3 in close agreement during daytime
kh2o'kh2o': stn 4 about 0.3 (g/m^3)^2 more variance than other sensors firs half of the night then down to 0.005 unit variability; spikes during tower maintenance; also spikes but closer to sunrise event when reading is stable at Sites 1 & 3, also these sites are 0.4-0.6 (g^m^3)^2 lower than other stations in late morning to afternoon
w'co2': ok, night: slightly more positive flux at stn 1 vs. stn 3, day: close agreement; maybe some greater variability at stn 3 vs. stn 1
co2'co2': ok, several spikes in overnight, stn 1 sightly higher than at stn 3 from 20:30-1:00, and from 3:00-6:00, similar agreement in morning, slightly higher variance at stn 3 after frontal passage