July 16, 13:15 CDT
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, no ISFS staff on site
partly cloudy skies much of overnight and morning from remnant thunderstorm complex that originated in KS/NE
clouds and haze in the afternoon
Vdsm: 13.5-13.8 V during day, down to 12.4 at night,
P: ok, pressure mostly steady at 973 mb until 7:00, rise to around 975 mb by 11:00
T.2m: ok, before midnight stn4 about 0.5 degree cooler than other sites
stn 2 warmer by 0.5 degrees than other sites most of daytime
RH.2m: 90-100% nighttime; dropping to 75-80% by afternoon
night: stns 4 3-5% RH higher than other stns 2 & 3 and about 7%RH higher than other stn 1
daytime stns 4 ~5-7%RH higher than stns 1 & 2, and ~few%RH higher than stn 3 [moisture effects due to mature corn with larger Potential evapotranspiration at Stn 4?]
H2O.2m: ok, nighttime from 26 to 19 g/m^3, up to 26-27 g/m^3 by mid afternoon
night: stn 1 about 1.0 g/m^3 drier than stn 4, few tenths drier than stns 2 & 3
day: stn 1 about 1.0 g/m^3 drier than stn 4, 0.3-0.5 g/m^3 drier than stns 2 & 3
Wetness: from last evening rain shower sensor dry by 23:00 Jul 15; another shower from 5:00-6:00, sensor dry by 8:45
T.10m: ok, before midnight stn 4 slightly cooler than stns 1-3; close agreement at all site after midnight
stn 1 about 0.3-0.5 degree warmer than other sites for late morning to afternoon
RH.10m: ok, before midnight stns 1 few%RH lower other sites; daytime from 8:30 to 14:00 stn 1 few%RH lower than other sites
H2O.10m: ok, nighttime: stn 2 0.3-0.5 g/m^3 more moist than stn 4 (other sites in btwn 2 & 4)
stn 4 sometimes few tenths g/m^3 less than other sites for the mid morning and late afternoon
Spd.10m: ok, sites mostly with same speed for much of overnight except for a ~0.5 m/s less at stn 1 than other sites from 1:00-2:00
daytime: close agreement for all sites
Dir.10m: ok, E to ESE flow before midnight, veering to SE and eventually SSE around sunrise, mostly SSE into the morning/afternoon
T.10m - T.2m: ok, night: stn 4 is about 0.3-0.5 degree warmer at 10 m vs. 2m than at stn 2, less so for stn 1 & 3
day: stn2 0.7 to 1.0 degree warmer at 2m vs. 10m than for stn 1 from 9:30-11:00
stn2 about 0.5-0.7 degrees more unstable than other sites rest of morning/afternoon
H2O.10m - H2O.2m: ok, stn 4 slightly drier gradient (0.7-1.0 g/m^3 more moist at 2m v.s 10m) than site 1, 0.5 more moist at 2m than for stns 2 & 3
daytime stn 4 is 1.0 g/m^3 drier at 10m vs. 2m than other other sites (again earlier planted corn drawing out more water?)
stn 2 & 3 about 0.5 g/m^3 drier at 10m vs. 2m than for stn 1
spd.4.5m: ok, see comments of Spd.10m, less clear of stn 1 drop at 1:00-2:00 also slightly higher speed at stn 1 than other sites around 22:00 (Jul 15)
dir.4.5m: ok, see comments of dir.10m, also slightly more ESE flow vs. SE flow at stn 1 vs. other sites during 1:00-2:00
w.4.5m: ok, before midnight: stns 1 & 2 less descent (-0.04 m/s) than stns 3 & 4 (-0.14, -0.10 m/s)
after midnight-sunrise, stations in close agreement, still more negative spikes by stn 3 and positive ones by stn 2
early to mid morning: same feature, stability forces controlling the pattern are being damped by 'cloud cover'
tc.4.5m: ok, before midnight: stns in close agreement
after midnight SE flow: stn 1&2 about 0.5 degree cooler than sites 3 & 4
daytime stns in close agreement except during PBL transition period 7:00-8:30? (0.5 degrees cooler at stn 2 vs. stn 3&4)
ldiag: ok few 100s of samples missing during morning/afternoon after the rainfall
vh2ov: ok, stn 2 mostly btwn 50-80 mV, down to near zero during rain periods
stn 4 mostly btwn 40-70 mV, similar pattern as at Site 2
kh2o: ok, stns 2 & 4 are about 1-1.5 g/m^3 lower than stns 1 & 3
night and day: stn 2 about 0.5 g/m^3 drier than stn 4
h2o(licor): ok, btwn 18-24 g/m^3 for night to day behavior
stn 3 about 0.5 to 0.7 g/m^3 more vapor than stn 1 during much of night
daytime: close agreement except in early-mid morning
lidiag (licor): ok, few missing samples at stn3 around time of rainfall
TKE.4.5m: ok, sites mostly in agreement, short nighttime 1hr periods for stn 2 and stn 1 with about 0.15 (m/s)^2 less TKE than for other stns
w'w': ok, see comment for TKE.4.5m, also similar pattern in u'u' and v'v'
u* : ok, similar to pattern in TKE.4.5m, also seen in u'w' stress
w'T' : ok, most sites have very close flux (within 0.01 C m/s or less)
w'h2o': ok, similar agreement as in w'T' except for daytime stn 2 slightly lower than other sites during mid morning
h2o'h2o': stns 1 &3 in close agreement night and day, stn 1, 3-4 are about 0.05 to 0.1 (g/m^3)^2 more than variance at stn 2
kh2o'kh2o': not ok during night stn 4 about 0.05 units higher than at stn 2 (close to other sites)
daytime: stn 2 seems to be reading low (compared to stn 4)
co2: ok,
w'co2': ok, slight period of night when flux >0 (2.5^10-4 g/m^2/s) at stn 3 vs. stn1 from 23:00 (Jul 15) thru 2:00
daytime stn 3 a bit greater co2 uptake before haze took over around 10:30
close agreement in afternoon
co2'co2': ok, similar pattern to w'co2', but slightly more variance in afternoon at stn 3 vs. stn 1