Layer description, carbon and nitrogen content and stable isotope record of bulk sedimentary organic matter from Laguna Potrok Aike

An investigation of stable isotope (d13C TOC and d15N TN) and elemental parameters (TOC, TN contents and TOC/TN ratios) of bulk organic matter (<200 µm) from sediment cores recovered from the Patagonian lake Laguna Potrok Aike (Argentina) in the framework of the ICDP deep drilling project PASADO provided insights into past changes in lake primary productivity and environmental conditions in South Patagonia throughout the last Glacial-Interglacial transition. Stratigraphically constrained cluster analyses of all proxy parameters suggest four main phases. From ca 26,100 to 17,300 cal. years BP, lacustrine phytoplankton was presumably the predominant organic matter source in an aquatic environment with low primary productivity rates. At around 17,300 cal. years BP, abrupt and distinct shifts of isotopic and elemental values indicate that the lacustrine system underwent a rapid reorganization. Lake primary productivity (phytoplankton and aquatic macrophytes) shows higher levels albeit with large variations during most of the deglaciation until 13,000 cal. years BP. The main causes for this development can be seen in improved growing conditions for primary producers because of deglacial warming in combination with expedient availability of nutrients and likely calm wind conditions. After 13,000 cal. years BP, decreased d13C TOC values, TOC, TN contents and TOC/TN ratios indicate that the lake approached a new state with reduced primary productivity probably induced by unfavourable growing conditions for primary producers like strengthened winds and reduced nutrient availability. The steady increase in d15N TN values presumably suggests limitation of nitrate supply for growth of primary producers resulting from a nutrient shortage after the preceding phase with high productivity. Nitrate limitation and consequent decreased lacustrine primary productivity continued into the early Holocene (10,970-8400 cal. years BP) as reflected by isotopic and elemental values.

Measuring the capacitance per unit length of biconical structures of arbitrary cross section /

"Contract No. AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center"

Oceanographic conditions in the northern Baffin Bay region, 24 July-6 August, 1970 /

"CG 373-54."

Evaluation of the 2006 Thanksgiving Click It or Ticket Campaign in Illinois, November 6 - December 10, 2006 /

Evaluates the impact of the "Click It or Ticket" campaign (April 2007) by using statewide public opinion and observational surveys of licensed Illinois drivers.

Organizational maintenance repair parts and special tools list : power unit, utility pack, gas turbine engine driven (Airesearch model PPU85-5), non-winterized, FSN 6115-937-0929, (Airesearch model PPU85-4), winterized, FSN 6115-134-0825.

"April 1969."

Operator's manual : processing equipment PH-406 and photographic film processing unit ES-20(1).

"May 1958."

Operators, organizational, direct support, and general support maintenance manual : water purification unit, 420 gallons per hour, electric driven, 115V, single phase, 60 hertz 1/20 to 1 1/4 hp (Litton Systems, Inc. model LPU 420-1), FSN 4610-012-5490.

"1 October 1969"--P. i.

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts) : laundry unit, single trailer mounted, w/canvas cover; Army type M532 (Eidal modl [sic] ELT9T), NSN3510-00-782-5294 and (Edro model EP120-LTU), NSN 3510-00-169-4735.

"May 1978."

Unit, direct support, and general support maintenance repair parts and special tools lists ... : crane-shovel, crawler mounted, 12-1/2-ton, 3/4 cu yd, diesel engine driven, NSN 3810-00-869-3092 : Bucyrus-Erie model 22BM.

"April 1992."

Organizational, direct and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for refrigeration unit, electric motor driven, 9,000 BTU, model CH609-31, NSN 4110-01-014-4646.

Includes index.

Operator's manual : water purification unit, base mounted, electric driven, AC, 115, 208 volt, single and 3 phase, 60 cycle, 3000 gallons per hour (MET-PRO model 3000-2700A), FSN 4610-857-0330).

"August 1963."

Operator's, organizational, and direct support maintenance manual : tank and pump unit, liquid dispensing, for truck mounting, mil design tank and pump units : gasoline engine driven model (977403) 13217E7100, NSN 4930-00-426-9960 : electric motor driven model (97403) 13217E7130, NSN 4930-01-130-7281.

Includes index.

Operator, organizational, direct support, and general support maintenance manual : tank and pump unit, liquid dispensing, for truck mounting (Advanced Industries model 1800) FSN 4930-070-1181.

"August 1972."

Operator and organizational maintenance manual : power unit, utility pack, gas turbine engine driven (Airesearch model PPU85-5), non-winterized, FSN 6115-937-0929 (Airesearch model PPU85-4), winterized, FSN 6115-134-0825.

"December 1968."

Operator, organizational, direct support, and general support maintenance manual : bath unit, portable, automated, Multi-head model PBU100, NSN 4510-01-139-4973.

"6 July 1984."