cosmos soil moisture and water vapor and carbon dioxide fluxes
DESCRIPTION
COSMOS Soil Moisture and Water Vapor and Carbon Dioxide Fluxes. Russell Scott. Savanna. Creosote Shrubland. Grassland. Grassland. Riparian Woodland. Riparian Grassland and Shrubland. - PowerPoint PPT PresentationTRANSCRIPT
COSMOS Soil Moisture and Water Vapor and Carbon Dioxide Fluxes
Russell Scott
SECA consists of an array of eddy covariance towers placed throughout southern Arizona to address a number of issues related the functioning of ecosystems in semiarid areas.
Creosote Shrubland
Grassland
Riparian Woodland
Savanna
Grassland
Riparian Grassland and Shrubland
Walnut Gulch Experimental Watershed
How do interannual and intra-annual variations on precipitation affects H2O and CO2 exchange in semiarid ecosystems
1. Cosmos and TDR soil moisture2. Cosmos and ET3. Cosmos and CO2 flux
Site Layout KN?
TDR profiles, Watershed Flume
Cosmos, Metflux, Phenocam
Flux sites
0 50 100 150 200 250 3000
0.05
0.1
0.15
0.2
0.25
0.3
0.35
day, 2012
VW
C
0-5 cm15 cm35 cm50 cm
From TDR profiles
B horizon clays inhibit deep infiltration
0 50 100 150 200 250 3000
0.05
0.1
0.15
0.2
0.25
day 2012
VW
C
0-10cm0-18cm0-5cmcosmos
0-5 cm 10 cm 15 cm 0-10 cm 0-18 cm 0-25 cmR2 0.88 0.88 0.60 0.91 0.90 0.86
0 50 100 150 200 250 300 350 400-10
0
10
20
30
40
50
day
P [mm]
ET [mm/day*10]
Evaporation
Faster decay when plants inactive
slower decay when plants active
7 mm runoff
Not Active ActiveET ET/Eto ET ET/Eto
R2 0.35 0.35 0.58 0.74
4 6 8 10 12 14 16 18 20-0.2
0
0.2
0.4
0.6
0.8
1
1.2
ET/
ET
o
[%]
Active plants
100 150 200 250 300
-10
-5
0
5
10
15
COSMOS & CO2 Flux
day
[0-25 cm]FC [mol m-2 s-1]
Carbon dioxide flux
rele
ase
upta
ke
100 150 200 250 3000
2
4
6
8
10
12
14
16
18
Reco
GEP
Ecosystem respiration and photosynthesis
4 6 8 10 12 14 16 18 200
1
2
3
4
5
6
Reco
GEP
These thresholds are really important for modeling but more information relative to shallow or deep moisture is critical
200 210 220 230 240 250 260 270
4
6
8
10
12
14
16
18
20
Rsoil [10*g/m2]
0 10 200
1
2
3
Rso
il - 1
day
lag R2=0.68
Soil respiration
Conclusions
NeedsEffective depth seems too deep
Modeled disaggregated products needed (very shallow and deep soil moisture) from assimilation of COSMOS data into soil moisture models
Good news Cosmos provides soil moisture at a
spatial resolution commensurate with EC fluxes
Preliminary comparisons show that Cosmos data is highly complementary to understanding water and CO2 fluxes