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GCE-LTER Project News

March 2017 Calendar

Feral Hog Hunt
dates: 03/01/2017 to 05/15/2017
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Latest Publications/Presentations

03/15/2017 –
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.
03/15/2017 –
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.
03/15/2017 –
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

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)

03/07/2017 – Map image
SALTEx map and plot layout (details)

02/20/2017 – Spreadsheet (GCE only)
Sampling log for the January 2017 GCE monitoring cruise (19 January, 2017) (details)

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GCE Project Announcements

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)
03/06/2017 – Research News

It's spring break, and researchers are taking the opportunity afforded by the flexibility in their schedules to work at Sapelo. Members of the Alber, Craft and Pennings labs are headed to Sapelo Island along with other GCE researchers. They will be working on the SALTEX experiment and the upland experiment, among other tasks. SALTEX is now entering its fifth year of operation--a pre-treatment year and three treatment years are completed--and we hope that the upland experiment will be as successful.

(contact Steve Pennings for additional information)
03/03/2017 – Publication News

Shanze Li and Steve Pennings recently published a paper on how the timing of wrack disturbance determines its effects on Spartina alterniflora and on stem-boring herbivores of Spartina. Plants completely recover from disturbance early in the season in terms of growth, and early disturbance actually stimulated flowering. Plants did not recover from disturbance later in the season, and flowering was suppressed. Plants disturbed late in the season also had a low frequency of stem-boring herbivores. The paper was featured on the cover of the journal Ecosphere, and is open access: http://onlinelibrary.wiley.com/doi/10.1002/ecs2.1675/full 

(keep reading)

(contact Steve Pennings for additional information)
03/01/2017 – Website Addition

The GCE-LTER site was established in 2000, and we have now collected 16 years of environmental and ecological data across our study domain. We have archived thousands of primary data sets in the GCE Data Catalog and GCE Data Portal from GCE monitoring, research studies and student projects, and we have also begun to synthesize core data to create long-term signature data products. To highlight our long-term data resources we have also now added a Long-Term GCE Data page on the private GCE website. This page provides links to summary tables and comparison plots to simplify discovery of long-term data sets and help visualize key long-term data trends in preparation for the GCE-IV NSF proposal.

(keep reading)

(contact Wade Sheldon for additional information)
02/08/2017 – IM News

Funding agencies and journal publishers are increasingly requiring that researchers deposit data and metadata in a national data repository and provide a DOI prior to submitting their final report or manuscript. Registering data in the GCE Data Catalog meets these requirements because the data and metadata are synchronized to the LTER Data Portal with replication to DataONE, providing both persistent archiving and a suitable DOI.

(keep reading)

(contact Wade Sheldon for additional information)

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959 and OCE-1237140. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.