IHOP 2002 Logbook Transcription: 5/24/02 – 6/3/02: Joseph Alfieri & Josh Uebelherr

1) Site: 8

Date: 5/24/02

Arrive: 1505

Depart: 1625

Conditions: heavy overcast, light sprinkling rain, light wind

Soil saturated with standing water up to approximately 5cm in depressions.

This is due to severe storms the previous night.

Observers: JU/JA & Hatim Sharif

Maintenance: None

Measurements/Notes:

- Trime soil moisture

- Soil core taken

2) Site: Site 7

Date: 5/24/02

Arrive: 1645

Depart: 1733

Conditions: heavy overcast, light sprinkle turning to moderate rain, very light wind.

While there is no standing water at this site the ground is still very wet.

Observers: JA/JU, & Hatim Sharif

Maintenance: None

Measurements/Notes:

- Limited number of trime soil moisture

- Soil core taken

- Limited measurements taken due to approaching severe weather (thunderstorms to the SSW)

3) Site: 8

Date: 5/25/02

Arrive: 1145

Depart: 1535

Conditions: partly cloudy, light N wind

Observers: JU/JA & Hatim Sharif

Maintenance: Domes cleaned and level check at 13:49 to 13:52 CDT

Measurements/Notes:

- Surface IR temperature distribution with vegetation height taken

- Soil appeared soaked, with standing water in the field

- MSR data corrupted

- Limited Porometry taken; the high RH within the canopy coupled with wind gust resulted in variable sensor chamber RH. The RH within the open chamber varied by as much as 5-8% depending on winds. This may affect the quality of the measurements.

- Photographs taken

- Caught ‘Box Turtle’

4) Site: 7

Date: 5/25/02

Arrive: 1600

Depart: 1758

Conditions:

Observers: JA/JU & Hatim Sharif

Maintenance: Radiometer domes cleaned 1752-1753 (no significant debris)

Measurements/Notes:

- Remaining trime soil moisture taken on southern transect

- MSR data corrupted

- Surface IR temperature distribution with vegetation height taken

- Limited porometry taken;

- Photographs taken

- Snake caught, black with red speckles on side and yellow stripe down back

5) Site: 9

Date: 5/25/02

Arrive: 1845

Depart: 1954

Conditions: clear, no wind

Observers: JU/JA

Maintenance: None

Measurements/Notes:

- Trime soil moisture taken

- Soil core taken at 1910

- Limited surface IR temperature distribution with vegetation height taken

- LAI taken

- MSR data corrupted

- Photographs taken

6) Site: 8

Date: 5/25/02

Arrive: 2010

Depart: 2030

Conditions: clear, no wind

Observers: JA/JU

Maintenance: None

Measurements/Notes:

- LAI taken

7) Site: 7

Date: 5/25/02

Arrive: 2045

Depart: 2055

Conditions: clear, no wind, great sunset and a lovely full moon.

Observers: JU/JA

Maintenance: None

Measurements/Notes:

- LAI taken on western transect only due to sunset

8) Site: 6

Date: 5/26/02

Arrive: 1515

Depart: 1830

Conditions: sunny, isolated clouds, light SSW wind

Observers: JA/JU, Peggy LeMone & Bob Grossman

Maintenance: None

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Porometry taken

- Photographs taken

- Soil cracked due to contraction from drying out, ~2 - 4mm in width

9) Site: 5

Date: 5/28/02

Arrive: 0955

Depart: 1240

Conditions: partly cloudy, low convective clouds present (~50 m high) likely due to significant soil moisture, very light SE wind

Observers: JU/JA

Maintenance: None

Measurements/Notes:

- Soils appeared dark, apparently due to high moisture content from recent precipitation

- Appeared to be ‘live’ insects on radiometer domes, perhaps seeking leftover condensate from overnight dew.

- Soil core taken at 1027 approximately 5m west of solar panel.

- Trime soil moisture taken

- Surface IR temperature distribution with vegetation height taken

- MSR taken. Note that the sky is overcast, which might influence the measurements.

- LAI taken

- Porometry taken. The leaves of the winter wheat are beginning to show some curling and yellowing. Also the upper surface of the leaves have small rust colored spots covering them.

- Photographs taken

10) Site: 4

Date: 5/28/02

Arrive: 1250

Depart: 1330

Conditions: partly cloudy turning to heavy overcast, severe thunderstorms approaching from the SE with light winds increasing to heavy winds from SE

Observers: JA/JU

Maintenance: None

Measurements/Notes:

- Limited MSR taken (8 points along west and south transect) due to intermittent sun through clouds (direct sun required)

- Limited surface IR temperature distribution with vegetation height taken (field view of flux tower IR instrument)

- Limited porometry taken along transects; measurement was aborted due to rain.

- Left site before all measurements taken due to approaching severe weather

- Photographs of approaching storm taken

11) Site: 10

Date: 5/28/02

Arrive: 1630

Depart: 2030

Conditions: mostly sunny, light SSE wind

Due to recent rains, the grass, which had appeared to be brown and dead, shows signs of greening up somewhat in places at this site.

Observers: JU/JA

Maintenance: Radiometer domes and krypton cleaned at 1916

Data downloaded from flux station

Start location: 50981

End location: 109061

Measurements/Notes:

- Soil core taken at 1920. Core extracted 5m from the fence due west of the flux station.

- Trime soil moisture taken

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Photographs taken

- Due to experience on this day at site 10 and at other sites with short vegetation, LAI instrument reset to accept rather than reject values equal to or greater than above canopy value. This will allow true representation of areas with 0 LAI (i.e. bare spots on ground). So, LAI value for this day and all previous did not include values from bare spots in the average and we may consider recalculating LAI for sites with short vegetation later (i.e. 2, 3, 4, 7, 8, 9, &10), using a value of 0 for all LAI calculations that used less than 4 values to generate the average LAI value. In other words, if only 3 values were used to calculate the average LAI, add 0 in to bring the number of values used for average LAI to 4 in order to adjust the LAI down to account for ‘bare spots’ that the instrument was previously throwing away.

12) Site: 2

Date: 5/29/02

Arrive: 0830

Depart: 1140

Conditions: clear, light SW wind

Observers: JA/JU

Maintenance: Radiometer domes cleaned at 1134

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Porometry taken

- Photographs taken

13) Site: 1

Date: 5/29/02

Arrive: 1208

Depart: 1405

Conditions: clear, light NW wind

Observers: JU/JA

Maintenance: Radiometer domes cleaned at 1235

Checked wiring of the soil profiler into the datalogger/multiplexer for loose connections from 1210 to 1230.

Measurements/Notes:

- Soil core taken at 1250 approximately 15m west of tower. The plowed soil is so loose and spongy that it collapses when the corer is driven into the ground. Because of this, only two levels could be discerned 0-5cm and 5-8cm.

- Trime soil moisture taken

- Surface IR temperature distribution taken

- MSR taken

- Photographs taken

- No vegetation present, only bare soil

14) Site: 3

Date: 5/29/02

Arrive: 1505

Depart: 1900

Conditions: mostly sunny, light SW

Observers: JA/JU

Maintenance: Radiometer domes cleaned at 1614

Measurements/Notes:

- Soil core taken at 1515 on the west side of the site just outside the electric fence.

- Trime soil moisture taken

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Porometry taken – began to have unstable readings with porometer

- Photographs taken

15) Site: 3

Date: 5/30/02

Arrive:0553

Depart: 0800

Conditions: clear, light S breeze, great sunrise

Observers: JU/JA

Maintenance: None

Measurements/Notes:

- Attempted diurnal profile of stomatal conductance and trime soil moisture, however porometer failed to record stable measurements, therefore sampling aborted

16) Site: 4

Date: 5/30/02

Arrive: 1235

Depart: 1600

Conditions: clear, light S wind

Observers: JA/JU

Maintenance: None

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken at 1250 5m west of radiometer sawhorse

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Photographs taken, including the sudden change of vegetation from S to N that the flux tower straddles

17) Site: 7

Date: 5/31/02

Arrive: 1345

Depart: 1600

Conditions: clear, light SSW breeze

Observers: JU

Maintenance: None

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken

- MSR taken

18) Site: 8

Date: 5/31/02

Arrive: 1625

Depart: 1645

Conditions: clear, light S wind

Observers: JU

Maintenance: None

Measurements/Notes:

- MSR taken

19) Site: 9

Date: 5/31/02

Arrive: 1721

Depart: 1930

Conditions: clear, light SSW breeze

Observers: JU

Maintenance: None

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken

- MSR taken

20) Site: 8

Date: 5/31/02

Arrive: 1954

Depart: 2039

Conditions: clear, light S breeze

Observers: JU

Maintenance: None

Measurements/Notes:

- Soil core taken

- Trime soil moisture taken

21) Site: 7

Date: 6/1/02

Arrive: 1411

Depart: 1607

Conditions: clear, light S wind

Observers: JA/JU

Maintenance: Radiometers cleaned at 1606

Measurements/Notes:

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Photographs taken

22) Site: 8

Date: 6/1/02

Arrive: 1642

Depart: 1745

Conditions: clear, moderate S wind

Observers: JU/JA

Maintenance: Radiometer domes cleaned 1652-1654

Measurements/Notes:

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Photographs taken

23) Site: 9

Date: 6/1/02

Arrive: 1818

Depart: 1921

Conditions: clear with a moderate wind from the SSW

Observers: JA/JU

Maintenance: Radiometer domes cleaned 1820-1822

Measurements/Notes:

- Surface IR temperature distribution with vegetation height taken

- MSR taken

- LAI taken

- Photographs taken