MOISST Flux Tower, PhenoCam, and MODIS VIs

Jeffrey B. Basara

Pradeep Wagle

Rajen Bajgain &

Xiangming Xiao

University of Oklahoma, Norman, OK

June 5, 2014

MOISST Flux Tower Located in the southwest side of the Site A enclousure

Deployed 7 November 2012 Jeffrey B. Basara, University of Oklahoma, Norman, OK Lynn McKee, USDA, Beltsville, MD John Prueger, USDA, Ames, IA

Campbell Scientific CSAT 3 3-D sonic anemometer

CNR1 4-component net radiometer

Licor 7500 CO2 and H2O Open Path System

Vaisala HMP45C air temperature/humidity sensor

Hydra Probe soil moisture sensor. REBS soil heat flux plates (3)

Apogee Infrared Temperature Sensor

MOISST Flux Tower Looking Northwest

iGOS East iGOS West

iCOS East iCOS and iGOS sites

at El Reno, OK

PhenoCam

PhenoCam Observations

0.31

0.32

0.33

0.34

0.35

0.36

0.37

0 100 200 300 400

GCC

DOY

2012

2013

Seasonality of Green Chromatic Coordinate [GCC= G/(R+G+B)]

Aug 21, 2012 Aug 21, 2013

Relationship between PhenoCam GCC and MODIS EVI

y = 0.14x + 0.26 R² = 0.84, n=72

0.30

0.32

0.34

0.36

0.38

0.40

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

GC

C

NDVI

y = 0.18x + 0.28 R² = 0.86, n= 72

0.3

0.32

0.34

0.36

0.38

0.4

0.1 0.2 0.3 0.4 0.5 0.6

GC

C

EVI

Near-surface remote sensing observation showed strong

correspondence with MODIS-derived VIs.

Annual NEE Patterns 2012 and 2013 (MOISST)

Date

NEE, µmol m-2 s-1

-30

-20

-10

0

10

20

30

12/23/11 2/11/12 4/1/12 5/21/12 7/10/12 8/29/12 10/18/12 12/7/12 1/26/13

NEE 2012

-30

-20

-10

0

10

20

30

12/23/12 2/11/13 4/2/13 5/22/13 7/11/13 8/30/13 10/19/13 12/8/13 1/27/14

NEE 2013

Early greening up

Late greening up

Severe drought effect

Small drought effect

Annual ET Patterns 2012 and 2013 (MOISST)

Date

ET, mm 30 min-1 Larger ET magnitudes

Severe drought effect

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

12/23/11 2/11/12 4/1/12 5/21/12 7/10/12 8/29/12 10/18/12 12/7/12 1/26/13

ET 2012

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

12/23/12 2/11/13 4/2/13 5/22/13 7/11/13 8/30/13 10/19/13 12/8/13 1/27/14

ET 2013

Soil Moisture Dynamics: 2011 - 2013

0

10

20

30

40

50

60

1/22/2010 8/10/2010 2/26/2011 9/14/2011 4/1/2012 10/18/2012 5/6/2013 11/22/2013 6/10/2014 12/27/2014

So

il m

ois

ture

(%

vo

lum

etr

ic)

Date

COSMOS measurements (http://cosmos.hwr.arizona.edu)

Mesonet soil moisture at 5 and 25 cm depths

0

10

20

30

40

01/22/2010 08/10/2010 02/26/2011 09/14/2011 04/01/2012 10/18/2012 05/06/2013 11/22/2013 06/10/2014 12/27/2014

So

il m

ois

ture

(%

vo

lum

etr

ic)

Date

WC_5 WC_25

Ranged from ~ 5-40%

Ranged from > 10 to < 40%

MODIS VIs: 2011 - 2013

Seasonality of EVI from 2011 to 2013 against soil moisture at 5 cm and 25 cm

0

0.1

0.2

0.3

0.4

0.5

0.6

0

10

20

30

40

11/18/2010 04/17/2011 09/14/2011 02/11/2012 07/10/2012 12/07/2012 05/06/2013 10/03/2013 03/02/2014

EV

I

So

il m

ois

ture

(%

vo

lum

etr

ic)

Date

WC_05 WC_25 EVI

Seasonality of EVI vs soil moisture at 5 cm: 2012

0

0.1

0.2

0.3

0.4

0.5

0

10

20

30

40

12/23/2011 04/01/2012 07/10/2012 10/18/2012 01/26/2013

EV

I

So

il m

ois

ture

(%

vo

lum

etr

ic)

Date

WC_05 EVI

EVI declined sharply – soil moisture < 15%

Seasonality of LSWI from 2011 to 2013 against soil moisture at 5 cm and 25 cm

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0

10

20

30

40

01/07/2011 06/06/2011 11/03/2011 04/01/2012 08/29/2012 01/26/2013 06/25/2013 11/22/2013

LS

WI

So

il m

ois

ture

(%

vo

lum

etr

ic)

Date

WC_05 WC_25 LSWI

Future Work

1) Hiring a GRA to specifically work on flux tower data at MOISST

(research and requests) and similar sites.

2) Similar flux towers (and a COSMOS system) are also being

deployed at the Grazinglands Research Laboratory near El

Reno, OK.

3) Expand work related to the Mesonet Evapotranspiration Model

(MEMo) using MOISST Flux data.

4) Expand work on the 2012 flash drought analysis and compare it

with 2013 flash recovery observations.

5) Integrate/link the flux tower data with the other existing datasets

and collaborative projects.

Questions?