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GCE-LTER Project News

May 2017 Calendar

(no events scheduled)

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Latest Publications/Presentations

05/09/2017 –
Jung, Y. and Burd, A.B. 2017. Seasonal changes in above- and below-ground non-structural carbohydrates (NSC) in Spartina alterniflora in a marsh in Georgia, USA. Aquatic Botany. 140:13-22. (DOI: https://doi.org/10.1016/j.aquabot.2017.04.003)
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.

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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

05/12/2017 – LTER News

The Environmental Data Initiative (EDI), a new NSF-funded data center that has replaced the LTER Network Information System (NIS) as the primary repository for LTER data and metadata, is now a full-fledged DataONE Member Node. This means that GCE catalog data sets contributed to the EDI Data Repository can be searched for in two places:

(keep reading)

(contact Wade Sheldon for additional information)
05/07/2017 – Award

The US Department of Energy Joint Genomic Institute (JGI) has awarded support for the proposal "Microbial activity and community composition in a tidal freshwater marsh in response to sea level rise and saltwater intrusion." JGI will provide sequencing of DNA and RNA from the SALTEx (Seawater Addition Long Term Experiment) treatment plots to assess how microbial communities will respond to sea level rise, including submergence and saltwater intrusion. The Wetlands Lab gratefully acknowledges the efforts of Sarah Widney (Indiana University) who drafted the proposal and Mary Ann Moran (University of Georgia) who made thoughtful suggestions and edits that enabled us to "clear the bar" on our third (and final) attempt.

(contact Chris Craft for additional information)
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)
04/07/2017 – Software Release

We are pleased to announce that version 3.9.7 of the GCE Data Toolbox for MATLAB is now available for download. This is an incremental update that includes a number of enhancements and bugfixes added since the August 2016 release, most importantly changes to USGS, NOAA and LTER data retrieval functions to accomodate the recent switch to secure protocols (HTTPS) for accessing their respective web servers. Background information about this generalized data management software is available at https://gce-svn.marsci.uga.edu/trac/GCE_Toolbox.

The general public distribution files are available on the GCE Data Toolbox web site at:

The release can also be checked out from the GCE Subversion (SVN) server at:

GCE-LTER distributions, with specialized GCE workflows and metadata templates, are also available at:

(contact Wade Sheldon 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)

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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.