title of presentation - eo science for society · marine biogeochemistry and bio-optics around the...
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Marine Biogeochemistry and Bio-Optics around the Irish continental shelf
Peter Croot1,4, Caroline Cusack2, Allan Grassie1, Catherine Jordan1,2, Monica Mullins1,4, Sarah Nicholas1,3,4 and Ciaran O’Donnell2
1National University of Ireland Galway, 2Marine Institute, 3Stony Brook University (USA) and 4iCRAG@NUI Galway
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 2
Co-Authors
Ciaran O’Donnell
Caroline Cusack
Allan GrassiePhD studentCDOM & Light
Monica MullinsPhD student (iCRAG)SAR & slicks
Catherine JordanPhD student (Cullen)Hyperspectral
Sarah Nicholas Post-Doc Marine Biogeochem(Now at BNL)
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 3
Funding Acknowledgments
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 4
Research Motivation: Understanding the Impact of Multiple Stressors on Marine Ecosystem Services
Conversi et al (2015)
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 5
What controls phytoplankton production on the western irish shelf?
May 22, 2010 MODIS Terra“The phytoplankton may have benefited from iron and nutrients in the ash dumped onto the ocean surface for weeks by Iceland’s Eyjafjallajökull Volcano”
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 6
Focus on Coastal Blooms and HABs
June 4, 2007. The bloom emanates from the mouth of the River Shannon and tapers off to the north. MODIS
(TERRA)
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 7
Western European Shelf Pelagic Acoustic Survey
WESPAS - RV Celtic Explorer survey over 6 weeks providing synoptic coverage of shelf waters from 47°N northwards to 58°30’N
Fisheries focused but allows CTD work and opportunity to collect water samples for biogeochemistry, phytoplankton and zooplankton analyses
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 8
Western European Shelf Pelagic Acoustic Survey
WESPAS sampled since 2016Biogeochemistry: Vertical and Horizontal Distribution of Nitrite, Nitrate, Urea (since 2018), Phosphate and Silicate. Radium isotopes in 2016 for shelf mixing processes.Pico and nanoplankton by flow cytometryBio-Optics: Particle absorption, Chlorophyll and reflectance measurements (since 2018)
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 9
Celtic Voyager Surveys: Hyperspectral Profiles
CV18012 Nephrops SurveyCV16035 SW Ireland
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 10
Picoplankton along the Western Irish Shelf
Aedin McAleer CV16035
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 11
WESPAS 2018 – Clear Skies
'OCEANCOLOUR_ATL_CHL_L3_NRT_OBSERVATIONS_009_036''dataset-oc-atl-chl-multi_cci-l3-chl_1km_daily-rt-v02'
June 27
MODIS image: Rare fair skies over Ireland & UK, 27TH June 2018
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 12
Surface Slicks: Bio-Optics & Sentinel Satellites
Baseline studies of CDOM from phytoplankton and other natural sources along the west coast of Ireland.
Satellite along with airborne hyperspectral observations of surface slicks along the Irish coast.
Validation of the Irish Atlantic Margin oil slick map, showing the regional structural basins (Funck et al. 2014), and the areas where oil slicks have been observed (oil-slick data provided by CGG: GOSD 2014).
Using combination of Sentinel 1 SAR and Sentinel 3 Ocean Colour
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 13
WESPAS 2018 – Clear Skies
Shipboard Reflectance Spectra: Trios RAMSES
Data: Catherine JordanFuture work: Comparison to Sentinel 3 reflectance data
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 14
WESPAS 2018 – Particulate Absorption
Data: Catherine JordanQFT1 filter holder with GF/F filter
Particulate Absorption Spectrum
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 15
Hyperspectral data from the water column
Analysis of in situ light data obtained from the NUI Galway Trios RAMSES SAMIP during CV16035 along the Irish west coast. Data results from an exponential fit to the light profile data in the top 25 m of the water column – data only
shown to 700 nm.
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 16
CDOM/FDOM WESPAS 2016 (Data: Allan Grassie)
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 17
WESPAS2018 CDOM
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 18
WESPAS2016 Spectral Slope of CDOM
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 19
Blue waters of the South Pacific Gyre (SPG) – purest ocean water –important for salt water contribution to reflectance spectra for separating CDOM and Chl a components.
Highlight: 1st FDOM survey of SPGData: Allan Grassie (NUIG) in preparation
UltraPac: Pacific Blue Waters
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 20
Membrane Inlet Mass Spectrometry
Hiden HPR-40 DSAUK example: Zonal variations of net community oxygen production (N(O2/Ar)) along the Celtic Sea.Seguro et al. (2018)
Measure climate relevant gases in seawaterO2 /Ar for net community oxygen production DMS, CO2, N2, CH4, N2O
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 21
Sources: Weathering from Irish Rivers (Peatbogs)
Peatland Soils Rivers
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 22
FDOM – Irish Rivers
3 humic components dominate the riverine FDOM signatureProject:Trace FDOM/CDOM from River to Sea
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Croot | Atlantic from Space Workshop | 23-25/01/2019 | Slide 23
Recommendations
• More of the same • Ocean Metrology -
intercomparisons• Improve/extend CDOM
products• Develop separate tools
for the Open Ocean, Coastal Zone & Submarine Groundwater