Soil Surface Roughness MeasurementsDuring SMAPVEX16-IA

Brian HornbuckleVictoria Walker

Vivian WallaceBill EichingerEnes Yildirim

SMAP Cal/Val 2017, Amherst, MA

greater soil surface roughnessincreases soil emission,increases retrieved soil moisture

Hornbuckle et al.: Soil Surface Roughness.

with grid board.

with pin board.

Soil surface roughness observationsduring IOP1 of SMAPVEX16-IA...

with lidar.

Hornbuckle et al.: Soil Surface Roughness.

with grid board.

with pin board.

Soil surface roughness observationsduring IOP1 of SMAPVEX16-IA...

Hornbuckle et al.: Soil Surface Roughness.

1

2

3

4 5 6

north-to-south,

west-to-east,

at three different points(A,B,C) within each field

Hornbuckle et al.: Soil Surface Roughness.

with grid board.with pin board.

Soil Surface Roughness in IOP2...limited measurements due to crops.

Hornbuckle et al.: Soil Surface Roughness.

Lidar: 1 mm spot size / footprint2.5 mm separation distance

Pin and grid board photosmanipulated to extract data.

Hornbuckle et al.: Soil Surface Roughness.

19 different sites,3 sites measured twice.

Hornbuckle et al.: Soil Surface Roughness.

lidar data

Hornbuckle et al.: Soil Surface Roughness.

LTAR

S10

S14

Hornbuckle et al.: Soil Surface Roughness.

SMAP/SMOS value

lidar data

Hornbuckle et al.: Soil Surface Roughness.Hornbuckle et al.: Soil Surface Roughness.

Pin and grid boards show approximately the same information.

Hornbuckle et al.: Soil Surface Roughness.Hornbuckle et al.: Soil Surface Roughness.

Complete scan of tower radiometer footprints.

Hornbuckle et al.: Soil Surface Roughness.

Summary...Soil surface roughness was measured during SMAPVEX16-IA.

Data available at

roughness: https://iastate.box.com/v/SMAPVEX16IA-roughness-report

Report describing the data available soon at same location.

After some more checks, will deposit data at SMAPVEX16 site.