Letourneau, M.L., Pannill, V., Babcock-Adams, L. and Medeiros, P.M. 2016. Presentation: Dissolved organic matter composition and processing in the Altamaha River and Estuary: The influence of hydrology. Goldschmidt Conference, June 2016, Yokohama, Japan.
Letourneau, M.L. and Medeiros, P.M. 2017. Presentation: The influence of hydrology on dissolved organic matter composition and degradation in the Altamaha River and Estuary. ASLO 2017 Aquatic Science Meeting, March 2017, Honolulu, Hawaii.
Medeiros, P.M., Babcock-Adams, L., Seidel, M., Castelao, R., Di Iorio, D., Hollibaugh, J.T. and Dittmar, T. (in press). Export of terrigenous dissolved organic matter in a broad continental shelf. Limnology and Oceanography.
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Latest Data Releases
03/14/2017 – Data Release
Provisional CTD data from the GCE Mini-Cruises are now processed and online. These data also include CTD profiles taken around the time of Hurricane Matthew (October 2016). https://gce-lter.marsci.uga.edu/private/app/ctd_data.asp
Note that the SeaBird CTD malfunctioned in May 2016, so no CTD profile data were collected for that month. The June through August surveys were sampled using the Castaway handheld CTD profiler while the SeaBird was getting repaired.
Also, the October Mini-Cruise data was lost. We have data from October in the Hurricane Matthew casts, but not from our normal monthly stations.
02/22/2017 – Data Release
Historic NOAA Palmer Drought Index data sets and plots for Georgia Division 9 (coastal counties; see map) are now available in the GCE Data Portal. These indices are useful for characterizing the timing and severity of drought events in the long-term climate record. The data were downloaded from NOAA and converted into tabular data sets with decoded state and date columns to simplify filtering, plotting and analysis.
Monthly indices are available from 1895 to present, and will be updated approximately quarterly. Complete data sets for all US climate divisions can also be browsed and downloaded for off-line analysis. Separate data sets are provided for four types of drought indices, as described below and in data set metadata:
Palmer Drought Severity Index (PDSI): attempts to measure the duration and intensity of the long-term drought-inducing circulation patterns. Long-term drought is cumulative, so the intensity of drought during the current month is dependent on the current weather patterns plus the cumulative patterns of previous months. Since weather patterns can change almost literally overnight from a long-term drought pattern to a long-term wet pattern, the PDSI can respond fairly rapidly.
Palmer Modified Drought Index (PMDI): Operational version of the PDSI. Description available in Heddinghaus and Sabol (1991).
Palmer Hydrological Drought Index (PHDI): measures hydrological impacts of drought (e.g., reservoir levels, groundwater levels, etc.) which take longer to develop and longer to recover from. This long-term drought index was developed to quantify these hydrological effects, and it responds more slowly to changing conditions than the PDSI.
Palmer Z Index (ZNDX): measures short-term drought on a monthly scale.
01/26/2017 – Data Release
Finalized 2016 data from the SINERR/GCE weather station at Marsh Landing on Sapelo Island were added to the GCE Data Catalog (MET-GCEM-1701). A cumulative data set covering the period 2003-2016, with tables containing both original 15-minute observations and summarized daily statistics, was also added to the catalog (MET-GCES-1701) and will be updated annually.
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Latest File Uploads
04/28/2017 – Document (GCE only)
Local and landscape scale biodeposition by the ribbed mussel, Geukensia demissa (details)
04/25/2017 – Document
Trace metal sampling protocol used for data set CHM-OTH-1702 (Chemical speciation of copper in a salt marsh estuary near Sapelo Island, Georgia) (details)
03/14/2017 – Spreadsheet (GCE only)
Sampling log for the February 2017 GCE monitoring cruise (20 - 23 February, 2017) (details)
03/14/2017 – Spreadsheet (GCE only)
Sampling log for the October 2016 GCE monitoring cruise (20 October, 2016) (details)
03/14/2017 – Spreadsheet (GCE only)
Sampling log for the Hurricane Matthew (October 2016) GCE monitoring cruise (04 - 21 October, 2016) (details)
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GCE Project Announcements
04/24/2017 – Graduate Defense
Fan Li successfully defended her dissertation, "Response and recovery of low-salinity marsh plant communities to constant and pulsed saline intrusion". Fan worked on the GCE saltex experiment and some associated mesocosm experiments. She's revising the dissertation and hopes to get three research chapters submitted to journals before she heads to China in May.
Fan at mangrove field site in Texas(contact Steve Pennings for additional information) 03/31/2017 – Announcement
Tim Montgomery, from the field crew, is heading off to school. He will start the graduate program in Environmental Engineering at GA Tech this fall. Additionally, he will be getting married this next week (don't try to stop him!). Tim is helping get Alyssa up to speed before he heads off so I decided to stop hugging him for now. We wish him all the best in the future!
(keep reading)(contact Jacob Shalack for additional information)
03/31/2017 – Announcement
The field crew at Sapelo Island has a new member. Alyssa Peterson started with us on Monday. She finished up with her MS in Environmental Science and Management from the University of Rhode Island last year where she looked amphibian populations in vernal pools. She has hit the ground running on the island. Say hello the next time you are down!
Alyssa photo(contact Jacob Shalack for additional information) 03/20/2017 – Research News
This past week Steve, Dontrece, Tim, Jacob and Andy Penniman made great progress setting up the high marsh experiment. We trenched in front of all the plots, and installed plastic barriers in 4 of five plots where we're trying to divert ground water into adjacent plots. The rest of the work should be done this week (we ran out of plastic). We'll know within a couple weeks (or after the first heavy rain) if the barriers are working as hoped.
(keep reading)(contact Steve Pennings for additional information)
03/13/2017 – Research News
The Craft and Pennings lab were hard at work at SALTEX this past weekend. The Craft lab collected cores from all the plots for the analysis of soil properties, and the Pennings lab planted three species of brackish marsh plants into all the plots. These "phytometers" will be harvested in the summer or fall, and will measure the quality of the plots for supporting growth of brackish marsh plants. We have not seen much invasion of the plots by more salt-tolerant plants, probably because the plots are so far away from appropriate vegetation. So this experiment will at least show (we expect) that the press plots would be readily colonized by brackish marsh plants if they were able to get there.(contact Steve Pennings for additional information)
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