The response of sea ice and brine water algae and bacteria to changes in salinity, temperature, light and UVB in Terra Nova Bay
Entry ID:
K043_2006_2008_NZ_4
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Summary
Abstract:
Samples of the bottom ice algae and brine algae (within 30cm of the top of the ice) were subjected to temperature, salinity, light and UVB experiments and analysed with PAM rapid light curves to determine the response of the algae to changes they will encounter during the processes of ice formation at the start of winter and ice melting in summer. Brine algae are likely to be adapted to high light ... and high UVB conditions near the surface of the ice and may have produced higher levels of protective pigments, MAA's, therefore the content of MAA's was analysed. Imaging PAM fluorometry was also used to gain a 3D image of photosynthetic stressors during the process of ice freeze and thaw on both algae and bacterial cells. The difference in thylakoid structure with increase in temperature was also analysed. Bacterial cells were collected at the end of exposure and a CTC assay was performed on them to determine the effect of UVB radiation. Bottom ice algae exposed to different light levels and UV exposure was analysed for cell counts, antioxidants and MAAs. Bacterial response to changes in light and salinity was examined by adding a fluorescent stain (CTC) to a melted entire sea ice core, a brine sample and a bottom ice sample and exposing the samples to various combinations of light and salinity. Samples were examined for cells that fluoresce due to metabolized CTC. The bacterial response to light and the presence/absence/inhibition of microalgae was examined using the vital stain and probe technique after exposing melted ice core samples to a range of irradiances for 4 hours. Samples of the brine community were collected and incubated for 5 days to determine the longer term response to light. Tritiated leucine was used calibrate the use of the CTC method. 
Related URL
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Description:
Andrew Martin PhD Thesis pdf
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: -74.83
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S: -74.83
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E: 164.5
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W: 164.5
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Temporal Coverage
Start Date:
2006-11-03
Stop Date:
2006-12-09
Start Date:
2007-11-10
Stop Date:
2007-12-10
Quality
This data set is the second public release of version 003. Quality of data is better than the earlier version. However, this reprocessed data is not fully validated yet.
Use Constraints
There are no use constraints.
Data Set Progress
IN WORK
Distribution
Distribution Media:
FTP
Distribution Size:
Approx 35 MB per file
Distribution Format:
HDF-EOS5
Fees:
None
Personnel
Role:
INVESTIGATOR
City:
De Bilt
Province or State:
AE
Postal Code:
3730
Country:
NL
Role:
INVESTIGATOR
City:
De Bilt
Province or State:
AE
Postal Code:
3730
Country:
NL
Role:
TECHNICAL CONTACT
Role:
DIF AUTHOR
Phone:
301-614-5284
Email:
Suraiya.Ahmad at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
Ahmad, S. P., P. F. Levelt, P. K. Bhartia, E. Hilsenrath, G. W. Leppelmeier,and J. E. Johnson, "Atmospheric Products from the Ozone Monitoring Instrument(OMI)", Proceedings of SPIE conference on Earth Observing Systems VIII, San Diego, ... California, Aug 3-8, 2003.
http://disc.sci.gsfc.nasa.gov/acdisc/ozone/docs/omi-spie-2003.doc
Brinksma, E. J., K. F. Boersma, and P. F. Levelt, OMI-Validation
Requirements, May 16, 2003.
Levelt, P.F., G.H.J. van den Oord, M.R. Dobber, A. Malkki, H. Visser, J. de
Vries, P. Stammes, J. Lundell and H. Saari, The Ozone Monitoring Instrument,
IEEE Trans. Geo. Rem. Sens., 2006, Vol. 44, No. 5, 1093-1101,
doi:10.1109/TGRS.2006.872333.
Levelt, P.F., E. Hilsenrath, G.W. Leppelmeier, G.H.J. van den Oord, P.K.
Bhartia, J. Tamminen, J.F. de Haan en J.P. Veefkind, Science Objectives of the
Ozone Monitoring Instrument, IEEE Trans. Geo. Rem. Sens., 2006, Vol. 44, No. 5,
1199-1208, doi:10.1109/TGRS.2006.872336.
Levelt, P.F., J. P. Veefkind, R. H. M. Voors, and J. de Vries,
"Instrument Description", Algorithm Theoretical Baseline Document: OMI
Instrument, Level 0 - 1B processor, Calibration & Operations,
P. F. Levelt (ed.), vol. I, ATBD-OMI-01, version 2, Aug. 2002.
http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/docs/OMI/
ATBD-OMI-01.pdf
More, J.J., The Levenberg-Marquardt algorithm: implementation and theory. In
Numerical Analysis Proceedings (Dundee, June 28 - July 1, 1977, G. A.Watson,
Editor), Lecture Notes in Mathematics 630, Springer-Verlag, 1978.
Torres, O., R. Decae, J.P. Veefkind, and G. de Leeuw, OMI Aerosol Retrieval
Algorithm, in OMI Algorithm Theoretical Basis Document: Clouds, Aerosols, and
Surface UV Irradiance, Vol. 3, version 2, (OMI-ATBD-03, P. Stammes, Ed.),
http://eospso.gsfc.nasa.gov/ eos_homepage/for_scientists/atbd/docs/OMI/ATBDOMI-
03.pdf, 2002.
Schoeberl, M.R., A.R. Douglass, E. Hilsenrath, P.K. Bhartia, R. Beer, J.W.
Waters, M.R. Gunson, L. Froidevaux, J.C. Gille, J.J. Barnett, P.F. Levelt and
P. DeCola, Overview of the EOS aura mission, IEEE Trans. Geo. Rem. Sens., 2006,
Vol. 44, No. 5, 1066-1074, doi:10.1109/TGRS.2005.861950.
Schoeberl, M.R., A.R. Douglass, E. Hilsenrath, P.K. Bhartia, J. Barnett, J. Gille,
R. Beer, M. Gunson, J. Waters, P.F. Levelt,P. DeCola, "The EOS Aura Mission," EOS,
Transactions, American Geophysical Union 85 , Number 18, 4 May 2004. [Preprint]
http://aura.gsfc.nasa.gov/project/eos-agu-aura-article.pdf
Veihelmann, B., P.F. Levelt, P. Stammes and J.P. Veefkind, Aerosol Information
Content in OMI Spectral Reflectance Measurements, submitted to ACP, 2007.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date:
2007-04-10
Last DIF Revision Date:
2012-04-09
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