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Temporal scales of coastal variability and land-ocean processes
J. Salisbury, J. Campbell, D. Vandemark, A. Mahadevan, B. Jonsson, H. Xue, C. Hunt
• Issues– Land fluxes daily variability – Phytoplankton - respiration– Production/sinking dynamics– Tides– Storms– Fronts– Probability of MODIS imagery in GOM?
% Coverage per image
MODIS coverage in the Gulf of Maine
All data
Jonsson, Salisbury Mahadevan, 2007
Relationship Between River Inputs and Coastal Ecosystem Properties
• Satellite evidence points towards linkages between high chlorophyll and river outflow
3 May 2004
Relationship Between River Inputs and Coastal Ecosystem Properties
• Relationship between river DIN flux and satellite-derived chlorophyll
Eastern Box
Western Box
Western Box
Source: Lohrenz et al. (2008)
DOC concentrations vs. EVIIpswich MA
0
0.10.2
0.3
0.4
0.50.6
0.7
0.8
2001 2002 2003 2004time
EVI Value
020040060080010001200140016001800
DOC (umol/l)
EVI-Developed land EVI-Forest land DOC - Ipswich
drought conditions
Addressing horizontal motion in remotely sensed data:
Lagrangian tracking of satellite products with a numerical model: NASA-NNH07ZDA001N-Carbon
J.Salisbury (PI), A. Mahadevan, B. Jonsson, J.Tweddle and D. Vandemark.
Jonsson, Salisbury, Mahadevan, Campbell, (2008a, 2008b)
POCt1
POCt2
(POCt2 - POCt1)
(t2 - t1)DICuptake
Ocean color (MODIS) derived POC tracked over “Lagrangian” space-time
Same premise: to the first order:
POCPHYTO ≈ DICuptake ≈ NCP
More assumptions:
1. For this exercise, phytoplankton POCPHYTO : Chl was constant (~60:1)*
3. Sinking, vertical mixing and phyto DOC are minimal, over short (2-7 day) time scales
2. Depth of integration was Kd490nm-1
Jonnson et al., 2009
- numbers are reasonable (relative to Salisbury et al, 2009)
- seasonal variability is correct
- slightly above zero (inferred heterotrophic) over 3 years
Median NCP
- we need to try this in an area with less clouds
The results provide estimates of Gulf of Maine NCP over 3 years
Results are promising but we need to address:
- We need phytoplankton carbon from space!
- Mixing, advection (vertical and horizontal)
- Air-sea exchange of CO2
- Disparate ocean color and SST data sets
One broad conclusion for both topics:
Satellite color data contain valuable information about the temporal and spatial dynamics of DICuptake in the surface ocean.
This research is supported by:
NASA
NASA-NNH07ZDA001N-Carbon NASA - NNX06AE29G -NIP
- and NOAANOAA NA05NOS4731206
Thanks!
Results from Chalk-ex related to GEOCAPE: highlighting rapid rates
of dispersion of inanimate chalk particles in a Slope environment
William M. Balch, Bigelow Laboratory for Ocean Sciences, POB475, McKown Point Rd, W.
Boothbay Harbor, ME 04575