August 1 22:00 CDT
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, no ISFS staff on site
overnight fog and dew; daytime partly cloudy hot and humid with light to moderate winds in the afternoon,
Few sensors with anomalous readings during very wet periods at night and early morning
**2m TRH fan likely malfunctioned at ncar3, temp reading about 2-3 degrees warmer than other sites...should be replaced by Tuesday mid-late morning
** Krypton voltage seems a bit low, also schedule lowering of masts to clean the sensors at ncar2 and ncar4
Vdsm: 13.5-13.7 V during day, down to 12.4 at night
P: ok, pressure steady much of overnight, falling 4 mb through the afternoon
T.2m: night: stn 1 & 4 about 1.0 degree C cooler than 2 & 3 from 23:00-3:00, from 3:00 to 6:00 Sites 1 & 2 about 1.0 degrees cooler than 3 & 4; fan at stn 3 likely malfunctioned around 8:00 (~2-3 degrees C higher than other sites)
RH.2m: stn 4 longer period of saturation, stn 2 reaches 100% RH 4 hrs later and Sites 1 & 3 6 hrs later than stn 2, daytime: stn 1 &2 in close agreement about 5%RH lower than stn 4 and 10%RH higher than stn 3 (due to broken fan?)
H2O.2m: night: stn 1 about 1-1.5 g/m^3 less than stn 2 &3, stn 4 sometimes 0.5 g/m^3 greater than sites 2 & 3; day stn 4 about 1.5-2.0 g/m^3 more moist than other sites, stn 1 & 2 slightly drier than stn 3
Wetness: heavy dew event from 20:00 to 7:00, sensor dry by 9:45
T.10m: night: similar pattern to T.2m, 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; day during fog break up stn 2 about 0.7-1.0 g/m^3 drier than other sites, stn 2 delayed agreement with other sites 11:30, stns 1,3-4 agree by 9:00
Spd.10m: ok, most sites within +/- 0.5 m/s of each other during the night and daytime
Dir.10m: ok, mostly SE to S wind at night, S wind around sunrise backing to SE by 9:00, back to S/SSE rest of the afternoon and early evening
T.10m - T.2m: night: stn 4 sometimes 0.7 degrees C warmer at 10 m vs. 2 m, other times stns 1 & 2 slightly warm at 10m vs. 2m few hrs. before sunrise; good daytime agreement except for the lack of aspiration at 2m TRH at Site 3
H2O.10m - H2O.2m: from 21:00-6:30 stn 2 about 1.0 g/m^3 more vapor at 2m than 10 m, stn 4 near zero gradient in vapor, stn 1 & 3 slightly wetter at 10 m vs. 2m; good daytime agreement except for at Site 3
spd.4.5m: ok, similar for Spd.10m, wind around 1-1.6 m/s most of the night, about 2.5-3.0 m/s during the day
dir.4.5m: ok, see comments for Dir.10m, more E to SE wind during the night than at 10m, SSE to SE during the day
w.4.5m: ok, stns 1 & 3 more positive velocity at night vs. stn 4 slightly negative, stn 2 mostly near zero
tc.4.5m: ok, night: several periods when stn 1 is 1.0 degrees C cooler than other sites, stn 2 also following stn 1 pattern from 3:00-5:30, late afternoon slightly lower temperature at stns 1 & 2 vs. 3 & 4
ldiag: ok, few 100 samples missing at Site 3 during the night
kh2oV: stns 2 & 4 above 100mV before fog/dew dropping to 55-60mV, recovering to above 70-80mV after the inversion breakup
kh2o: stn 4 about 1.5 g/m^3 more moist than stn 2 and about 4 g/m^3 wetter than stn 1 & 3 during night; closer agreement at stn 2 in the daytime after the inversion breakup, stn 4 about 2.0 g/m^3 more vapor than stns 1 & 3
h2o(licor): ok, stn 1 about 1.0 g/m^3 drier than stn 3; during and after inversion breakup sites 1 & 3 are within +/- 0.5 units of each other
lidiag (licor): ok, few spikes corresponding to effect with dew/fog; no fictitious response in the afternoon
TKE.4.5m: ok, most of night stn 1 about 0.1-0.15 m^2/s^2 less TKE than other sites, sometimes 0.2-0.25 units less than at stn 4; good daytime agreement
w'w': ok, similar to TKE.4.5m, also in u'u' and v'v'
u*: ok, stn 1 less reduced u* by 0.1-0.15 m/s as similar to TKE.4.5m, also seen in u'w' and in v'w'
w'tc': ok, night: stn 4 about 0.02 m/s C larger negative flux than stn 1, other site in between 1 & 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. stn 1 and sometimes 2 except after 4:00, then sites have about same intensity; daytime: stns 4 & 3 a bit higher peak variance than other sites
w'h2o': ok, overnight: stn 3 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, rest of night close agreement with 1 & 3, 2 & 4 about 0.01-0.03 units more negative flux than others; afternoon less positive flux (by ~0.07-0.08 g/m^2/s) at stns 2 & 4 vs. stns 1 & 3
h2o'h2o' (licor): ok, , few spikes at both 1 & 3 during night; stn 1 & 3 in close agreement during daytime
kh2o'kh2o': stn 2 & 4 also spikes but closer to sunrise event when reading is stable at Sites 1 & 3, also these sites are 0.7-1.0 (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: no real difference between sites
co2'co2': ok, several spikes in overnight, stn 1 sightly higher than at stn 3 from 23:00-2:30, and from 3:00-6:00