<STUDY> 92Nov

<DESCRIPTION> PD92-09: Marine Carbon Cycling Cruise

<DATE_RANGE> 02Nov92-23Nov92

<ABSTRACT> Several independent, but complementary research objectives
addressed various aspects of the marine carbon cycle including experimental 
studies of microbial loop processes.  Studies ranged in scope from the 
deployment of an array of bottom-moored sediment traps, to in situ photographic 
measurements of particulate matter, to measurements of the response of 
bacterioplankton to increases in temperature and additions in organic 
substrates.  Research efforts also focused on autotrophic rate processes, 
krill biology, benthic protozoa and sulfur cycling.  

Work was done aboard the R/V Polar Duke PD92-09.
Dave M. Karl served as cheif scientist.

<SAMPLING_FREQUENCY>
Several day stations held at selected sites in additon to LTER grid
line 600 stations. Three time-series sediment trap moorings were depoloyed to
provide continuous measurements and samples of sinking partiulate materials
throughout the period of the spring-summer plankton bloom. The three moorings
in Palmer Basin approximately 2-10 km south of the axis of LTER line 600
between stations 600.080 and 600.120 provide a cluster mooring to be a single
replicated field experiment.

<SITES>
Locations included 7 stations along the LTER line 600, 3 stations in Dallman
Bay, 8 stations in Charlotte Bay, 10 stations in Paradise Harbour and 5
stations in the Deception Island crater. 

The timeline included:
11-02; 1131 - Depart Punta Arenas
11-05; 1400 - ETA Palmer Station

Trap locations:

<SITE_DESCRIPTION>
The spring phytoplankton bloom appeared to be in the earliest stages 
of development.  Imagery showed seasonal ice South of Adelaide Island.  
Fast ice found at Deception Bay; Pack ice encountered at Whaler's Bay.

<HYPOTHESIS>
The microbial loop and other processes contribute to marine carbon
cycling.

<EXPERIMENTAL_DESIGN>
Occupy individual stations, line 600 stations and set bottom moored
sediment traps in Palmer Basin.

<METHODS>
Data was obtained using a variety of methods, including: (a) CTD with
additional sensors for PAR, dissolved oxygen, light transmission and
stimulated fluorescence, (b) rosette-mounted Niskin bottles for collection of
discrete water samples, (c) 1-m plankton nets (oblique and towed), (d)
Isaacs-Kidd midwater trawl, (e) Smith-MacIntyre bottom sampler, (f) Asper-type
marine snow camera system, (g) MK7-21 bottom moored time-series sediment traps
(deployed only), (h) drifting sediment traps of the VERTEX multitrap design 
(2 deployments and recoveries), (i) in situ drifting photolysis array 
(1 deployment/recovery), (j) large volume pump sampler for collection of near
surface water samples and (k) zodiak-assisted collectins of seasurface
microlayer samples and ice-associated algal communities.

<LT_CORE_DATA_SET>

<LT_CORE_AREAS>

<PROPRIETARY_LIMITS>
Citation acknowledgement: "Data from the Palmer LTER data archive
were supported by Office of Polar Programs, NSF (OPP-9011927)."

<RELATED_STUDIES>
RACER-Research on Antarctic Coastal Ecosystem Rates

<KEYWORDS>
antarctic, southern ocean, sediment traps, microbial

<DATA_FILENAMES>
~lter/data/92nov/*

<PUBLICATIONS>
Karl, D.M. and W.O. Smith, R/V Polar Duke 92-09:02-23 November 1992 Initial
Cruise Report. Univ of Hawaii Report, 1992.

<PRINCIPAL_INVESTIGATORS>

<COOPERATING_AGENCIES>
National Science Foundation, Division of Polar Programs

<DATE_SUBMITTED>
27Jul93-ksb

<DATE_UPDATED>
15Dec96-ksb

<SUBMITTED_BY>
David M. Karl-Dec92

<CONTACT_PERSON>
David M. Karl

<COMMENTS>

<FORM> 
Study Form V.1.2 for describing a collection of datafiles.