|Sabine, Christopher L.
|National Oceanic and Atmospheric Administration (NOAA-PMEL)
|Oregon State University (OSU-CEOAS)
|Gegg, Stephen R.
|Woods Hole Oceanographic Institution (WHOI)
|BCO-DMO Data Manager
SO-GasEx Scientific sampling event log
Generated aboard ship by members of the science party
Original data were contributed by PI as a single sheet Excel file: GASEX_Event_Log_BH.xls
22 duplicate event numbers have been identified in the original event log.
The duplicate events were corrected by adding one minute to the event time for the non-CTD event.
For reference, the duplicate events are listed in the file: SO-GasEx_Event_Log_DuplicateEvents.xls.
data column headers changed to be consistent with BCO-DMO vocabulary
"Event #" changed to "event", format remains the same
date reformatted to YYYYMMDD
time reformatted to HHMM
lat/lon decimal degrees padded to 6 decimal places
"OP ID" changed to "ev_code", format remains the same
"submitted by" changed to "person", format remains the same
"Event (be as descriptive as necessary)" changed to "activities_and_comments"
Note: some event fields were truncated due to excessive length (>120 chars)
Truncated event fields indicated by "[+++]" at end of activities_and_comments field
See below for complete activities_and_comments entry for truncated events
Complete activities_and_comments are also available in the original spreadsheet
(see link to original in Acquisition description)
090301.CLC. all positive longitude values changed to negative (West);
all incorrect longitude values were associated with DES type events
========================= event date time longitude latitude ev_code ------------------------- 0640107 20080304 0107 47.775000 -50.698330 DES 0862007 20080326 2007 37.429910 -51.289290 DES 0870205 20080327 0205 37.428160 -51.428160 DES 0872149 20080327 2149 37.391970 -51.228610 DES 0880137 20080328 0137 37.314960 -51.318600 DES 0881536 20080328 1536 37.299140 -51.320470 DES 0882156 20080328 2156 37.307540 -51.315550 DES 0890307 20080329 0307 37.268260 -51.268260 DES 0900308 20080330 0308 37.298430 -51.311650 DES 0901353 20080330 1353 37.324940 -51.309600 DES 0910138 20080331 0138 37.350060 -51.303200 DES 0920144 20080401 0144 37.363990 -51.281180 DES 0921950 20080401 1950 37.457140 -51.374990 DES
OPT= optical cast
DES=discrete sample from underway line
SUR=survey using underway systems
event date time lon lat ev_code person activities_and_comments 0631700 20080303 1700 -58.329333 -50.806550 INJ Sullivan start filling ~4800 L aluminum dosing tank for for tracer gases with ship's service seawater (from tap outboard of the starboard crane which is forward of the tank) 0641246 20080304 1246 -50.839000 -50.848000 UWY Drapeau started underway measurements of T, S, Chl a fluorescence, optical backscattering, acid labile backscattering (PIC), particulate light absorption and attenuation, dissolved light absorption and attenuation 0641527 20080304 1527 -43.167000 -50.333000 DES Lance Discrete sampling of underway line in main lab for fluorometric chlorlophyll, Ap (particulate absorption), trial PE exp (C-14 uptake vs. light gradient) 0652030 20080305 2030 nd nd INJ Sullivan start flow of SF6 through dosing tank (headspace recirculation flow ~3 L/min; SF6 delivery pressure 40 psi, SF6 flow ~0.10-0.13 L/min) 0672352 20080307 2352 nd nd INJ Sullivan finish adding ~8.5 L 3He to water in dosing tank. During 3He dosing, do two test tows of the lead fish for dispensing. On one tow a pressure transducer showed that the lead fish was 6-7 meters deep. 0680000 20080308 0000 nd nd INJ Sullivan replace dosing top with a dispensing top and balloon. The balloon will be filled with water as the dosed water is dispensed, thus avoiding a gaseous headspace above the dosed water. 0770030 20080317 0030 nd nd INJ Sullivan Start recirculating headspace of dosing tank and adding SF6 (~150-200 ml/min) to the recirculation stream. Monitor flows/bubbling for ~1.5 hrs 0780740 20080318 0740 nd nd INJ Sullivan SF6 gas cylinder is observed to be empty. Switch the pair of 3-way valves to isolate the recirculation loop and headspace from the gas pump and turn off the gas pump. 0791030 20080319 1030 nd nd INJ Sullivan Add a second (KNF Neuberger) gas circulating pump to the recirculation loop. The two pumps are run in parallel, with a loop of tubing and two 3-way valves to bypass the dosing tank. Increase the pressure delivered by the SF6 gas cylinder through a needle valve from 40 to 50 psi, to offset the increased back pressure from the output of the two pumps pushing through the 'fizzy' tube. 0802200 20080320 2200 nd nd INJ Sullivan Turn the two 3-way valves so that the gas pumps are connected to the bypass loop. Add seawater to the tank and dosing top so that there is ~0.7 L of gaseous headspace in the dosing top. 0802249 20080320 2249 nd nd INJ Sullivan Isolate the dosing tank headspace by turning the 3-way valves and turning off the gas recirculation pumps. While the gas recirculation was ongoing, the foam/bubbles reached the ~80% full level of the 1L dosing top. With bubbling stopped, there remains ~0.65 L headspace. 0811159 20080321 1159 -38.430000 -51.150000 INJ Sullivan Water-filled balloon in "headspace" of dosing tank bursts. Stop water flow out of dosing tank; continue augmenting water flow for ~5 minutes.
(Comma Separated Values (.csv), 55.04 KB)
Primary data file for dataset ID 2924
|latitude, negative denotes South
|longitude, negative denotes West
|Unique event number
|last name of person who submitted event
|3 letter event code for event op id (see Dataset/Processing decsription/PI Notes for codes)
|free field text description of eventNOTE: [+++} at end of activities_and_comments indicates additional text in field See Dataset/Processing description/PI_Notes for complete text of event
NOAA Ship Ronald H. Brown
The Southern Ocean GasEx experiment was conducted aboard the NOAA ship Ronald H. Brown with 31 scientists representing 22 institutions, companies and government labs. The cruise departed Punta Arenas, Chile on 29 February, 2008 and transited approximately 5 days to the nominal study region at 50°S, 40°W in the Atlantic sector of the Southern Ocean. The scientific work concentrated on quantifying gas transfer velocities using deliberately injected tracers, measuring CO2 and DMS fluxes directly in the marine air boundary layer, and elucidating the physical, chemical, and biological processes controlling air-sea fluxes with measurements in the upper-ocean and marine air. The oceanic studies used a Lagrangian approach to study the evolution of chemical and biological properties over the course of the experiment using shipboard and autonomous drifting instruments. The first tracer patch was created and studied for approximately 6 days before the ship was diverted from the study site, 350 miles to the south, to wait near South Georgia Island for calmer seas. After more than 4 days away, we returned to the study area and managed to find some remnants of the tracer patch. After collecting one final set of water column samples and recovering the two drifting buoys deployed with the patch, we relocated to the northwest, closer to the area where the first patch was started. A second tracer patch was created and studied for approximately 15 days before we had to break off the experiment and transit to Montevideo, Uruguay for the completion of the cruise.
The Southern Ocean Gas Exchange Experiment (SO-GasEx; also known as GasEx III) took place in the Southwest Atlantic sector of the Southern Ocean (nominally at 50°S, 40°W, near South Georgia Island) in austral fall of 2008 (February 29-April 12, 2008) on the NOAA ship Ronald H. Brown. SO-GasEX is funded by NOAA, NSF and NASA.
The research objectives for Southern Ocean GasEx are to answer the following questions:
The SO-GasEx cruise report and Science and Implementation plans, may also be available at the SO-GasEx science Web page.
The Ocean Carbon and Biogeochemistry (OCB) program focuses on the ocean's role as a component of the global Earth system, bringing together research in geochemistry, ocean physics, and ecology that inform on and advance our understanding of ocean biogeochemistry. The overall program goals are to promote, plan, and coordinate collaborative, multidisciplinary research opportunities within the U.S. research community and with international partners. Important OCB-related activities currently include: the Ocean Carbon and Climate Change (OCCC) and the North American Carbon Program (NACP); U.S. contributions to IMBER, SOLAS, CARBOOCEAN; and numerous U.S. single-investigator and medium-size research projects funded by U.S. federal agencies including NASA, NOAA, and NSF.
The scientific mission of OCB is to study the evolving role of the ocean in the global carbon cycle, in the face of environmental variability and change through studies of marine biogeochemical cycles and associated ecosystems.
The overarching OCB science themes include improved understanding and prediction of: 1) oceanic uptake and release of atmospheric CO2 and other greenhouse gases and 2) environmental sensitivities of biogeochemical cycles, marine ecosystems, and interactions between the two.
The OCB Research Priorities (updated January 2012) include: ocean acidification; terrestrial/coastal carbon fluxes and exchanges; climate sensitivities of and change in ecosystem structure and associated impacts on biogeochemical cycles; mesopelagic ecological and biogeochemical interactions; benthic-pelagic feedbacks on biogeochemical cycles; ocean carbon uptake and storage; and expanding low-oxygen conditions in the coastal and open oceans.
The Surface Ocean Lower Atmosphere Study (SOLAS) program is designed to enable researchers from different disciplines to interact and investigate the multitude of processes and interactions between the coupled ocean and atmosphere.
Oceanographers and atmospheric scientists are working together to improve understanding of the fate, transport, and feedbacks of climate relevant compounds, and also weather and hazards that are affected by processes at the surface ocean.
Oceanographers and atmospheric scientists are working together to improve understanding of the fate, transport, and feedbacks of climate relevant compounds.
Physical, chemical, and biological research near the ocean-atmosphere interface must be performed in synergy to extend our current knowledge to adequately understand and forecast changes on short and long time frames and over local and global spatial scales.
The findings obtained from SOLAS are used to improve knowledge at process scale that will lead to better quantification of fluxes of climate relevant compounds such as CO2, sulfur and nitrogen compounds, hydrocarbons and halocarbons, as well as dust, energy and momentum. This activity facilitates a fundamental understanding to assist the societal needs for climate change, environmental health, weather prediction, and national security.
The US SOLAS program is a component of the International SOLAS program where collaborations are forged with investigators around the world to examine SOLAS issues ubiquitous to the world's oceans and atmosphere.
|National Oceanic and Atmospheric Administration (NOAA)
|National Aeronautics & Space Administration (NASA)
|National Science Foundation (NSF)