Download - Helen Final Presentation
-
8/14/2019 Helen Final Presentation
1/23
Application of satellite derivedApplication of satellite derivedretrievals of ocean colour to theretrievals of ocean colour to the
MODIS ASTER Airborne Simulator
Helen Thomas
Student Airborne Research Program, 2009
A study over Monterey Bay,A study over Monterey Bay,
-
8/14/2019 Helen Final Presentation
2/23
OverviewWhy monitoring ocean colour properties (in particular,algal blooms) is important
Methods used to monitor blooms
Why Remote sensing methods are important!
Algorithms to retrieve Chlorophyll
Results
Conclusions - algorithm functionality and usefulness ofmethods
-
8/14/2019 Helen Final Presentation
3/23
Why study algal blooms?
Red tide bloom ofNoctiluca scintillans in NewZealand
Source:http://serc.carleton.edu/images/microbelife/t
Phytoplankton:
Base of the oceanic food chain
Are major producers of oxygen
Can affect the atmosphere by
production of DMS
Harmful Algal Blooms -
production of toxins and oxygen
depletion
-
8/14/2019 Helen Final Presentation
4/23
Methods
-
8/14/2019 Helen Final Presentation
5/23
ObjectivesMASTER = MODIS/ASTERSimulator
Comparisons Are
Important!
1. Compare MASTER andMODIS Satellite data within situ data
2. Apply satellite derivedChlorophyll a algorithms toMASTER
-
8/14/2019 Helen Final Presentation
6/23
Theoretical BasisFluorescence line height
Letelier and Abbott (1996)
-
8/14/2019 Helen Final Presentation
7/23
Theoretical BasisFluorescence line height
Letelier and Abbott (1996)
-
8/14/2019 Helen Final Presentation
8/23
Theoretical BasisFluorescence line height
Letelier and Abbott (1996)
-
8/14/2019 Helen Final Presentation
9/23
Theoretical BasisFluorescence line height
Fails under LowChlorophyll
conditions.
C
A
F
FLH = Lc-(Lf+((La-
Letelier and Abbott (1996)
But might work
in highchlorophyll
5 6 7
-
8/14/2019 Helen Final Presentation
10/23
-
8/14/2019 Helen Final Presentation
11/23
Results
BoatChlorophyll
MASTER FLH MASTER FLH
1. Fluorescence Line Height
FLH = Lc-(Lf+((La-Lf)*y/(x+y)))
-
8/14/2019 Helen Final Presentation
12/23
Results2. SeaWIFS OC2v4
R=log10(R490/R555) or log10(R490/R565)
Chl_oc2 = 10^(a0 + a1*R+a2*R^2+a3*R^3) +
BoatChlorophyll
MASTERChloro.
MASTERChloro.
-
8/14/2019 Helen Final Presentation
13/23
Results3. SeaWIFS OC4
R=log10(R443/R551) or log10(R488/R551)
Chl_oc4 =10^(a0 + a1*R +
BoatChlorophyll
MASTERChloro.
MASTERChloro.
-
8/14/2019 Helen Final Presentation
14/23
Results4. MODIS Chl_a
R=R443/R555 or R490/R555
Chl_a = 1o^(a0 +a1*R+a2*R^2+a3*R^3 +
BoatChlorophyll
MASTER
Chloro.
MASTERChloro.
-
8/14/2019 Helen Final Presentation
15/23
Results5. Polder Chl_a
R=log10(R490/R555)
Polder_chl = 10^(a0+a1*R+a2*R^2+a3*R^3)
BoatChlorophyll
MASTERChloro.
MASTERChloro.
-
8/14/2019 Helen Final Presentation
16/23
ResultsMODIS Time Series for July 2009
-
8/14/2019 Helen Final Presentation
17/23
ResultsMODIS Chl -a MODIS FLH
-
8/14/2019 Helen Final Presentation
18/23
Results BoatChlorophyll
MODIS Chl -a
-
8/14/2019 Helen Final Presentation
19/23
Results BoatChlorophyll
MODIS FLH
-
8/14/2019 Helen Final Presentation
20/23
IssuesTime lag
Spatial Scales
Interferences
Algorithms
Band Locations
-
8/14/2019 Helen Final Presentation
21/23
ConclusionsMASTER Bands are poorly positioned to retrieveFLH and Chlorophyll-a (in this case)
MODIS Chlorophyll-a retrieval reveals little in thiscase
MODIS FLH corresponds well to boat chlorophyllestimates
-
8/14/2019 Helen Final Presentation
22/23
-
8/14/2019 Helen Final Presentation
23/23
Acknowledgements