Operator's, organizational, direct support, and general support maintenance manual for semitrailer, tank, fuel, 5000 gallon, 4 wheel, M131A4 (NSN 2330-00-994-9459), M131A5 (NSN 2330-00-226-6079), semitrailer, tank, fuel servicing, 5000 gallon, 4 wheel, M131A4C (NSN 2330-00-994-9458) ....

"June 1992."

Organizational, DS, GS, and depot maintenance manual including repair parts : welding machine, arc, generator, electric motor driven, 300-amp DC arc, 220/440-V, 60-cycle, 3-phase, wheel mounted (Harnischfeger model W300 MG), FSN 3431-226-1569).

"April 1965."

Direct and general support maintenance manual : truck tractor, 10-ton, 6x6, M123 (2320-395-1875, M123C (2320-294-9552), M1231C (2320-226-6081), M123E2 (2320-879-6177), and truck cargo, 10-ton, 6x6, M125 (2320-219-7340).

Includes index.

Organizational maintenance manual for truck tractor, 10-ton, 6x6, M123 (2320-395-1875), M123C (2320-294-9552), M123A1C (2320-226-6081), M123E2 (2320-879-6177), and truck, cargo, 10-ton, 6x6, M125 (2320-219-7340).

Includes index.

Direct support and general support maintenance repair parts and special tools list (including depot maintenance allowances) : truck tractor, 10-ton, 6 x 6, M123 (2320-395-1875), M123C (2320-395-9552), M123A1C (2320-226-6081), M123E2 (2320-879-6177), and truck, cargo, 10-ton, 6 x 6, M125 (2320-219-7340).

Includes index.

Hand recipt manual covering the end item/Components of End Item (COEI). Basic Issue Items (BII), and Additional Authorization List (ALL) for semitrailer, tank, fuel, 5,000 gal., 4 wheel, M131A4 (NSN 2330-00-994-9459) ... M131A5C (NSN 2330-00-226-6080).

"December 1978."

Radon 222 and Radium 226 measured on water bottle samples during POLARSTERN cruise ARK-XXVI/3 (TransArc)

Air-sea gas exchange plays a key role in the cycling of greenhouse and other biogeochemically important gases. Although air-sea gas transfer is expected to change as a consequence of the rapid decline in summer Arctic sea ice cover, little is known about the effect of sea ice cover on gas exchange fluxes, especially in the marginal ice zone. During the Polarstern expedition ARK-XXVI/3 (TransArc, August/September 2011) to the central Arctic Ocean, we compared 222Rn/226Ra ratios in the upper 50 m of 14 ice-covered and 4 ice-free stations. At three of the ice-free stations, we find 222Rn-based gas transfer coefficients in good agreement with expectation based on published relationships between gas transfer and wind speed over open water when accounting for wind history from wind reanalysis data. We hypothesize that the low gas transfer rate at the fourth station results from reduced fetch due to the proximity of the ice edge, or lateral exchange across the front at the ice edge by restratification. No significant radon deficit could be observed at the ice-covered stations. At these stations, the average gas transfer velocity was less than 0.1 m/d (97.5% confidence), compared to 0.5-2.2 m/d expected for open water. Our results show that air-sea gas exchange in an ice-covered ocean is reduced by at least an order of magnitude compared to open water. In contrast to previous studies, we show that in partially ice-covered regions, gas exchange is lower than expected based on a linear scaling to percent ice cover.

Radium 228 and Radium 226 in surface water of the Kara Sea and Laptev Sea

The surface water in the Transpolar Drift in the Arctic Ocean has a strong signature of 228Ra. In an earlier study of 228Ra in the open Arctic we showed that the major 228Ra source had to be in the Siberian shelf seas, but only a single shelf station was published so far. Here we investigate the sources of this signal on the Siberian shelves by measurements of 228Ra and 226Ra in surface waters of the Kara and Laptev Sea, including the Ob, Yenisey and Lena estuaries. In the Ob and Lena rivers we found an indication for a very strong and unexpected removal of both isotopes in the early stage of estuarine mixing, presumably related to flocculation of organic-rich material. Whereas 226Ra behaves conservatively on the shelf, the distribution of 228Ra is governed by large inputs on the shelves, although sources are highly variable. In the Kara Sea the maximum activity was found in the Baydaratskaya Bay, where tidal resonance and low freshwater supply favour 228Ra accumulation. The Laptev Sea is a stronger source for 228Ra than the Kara Sea. Since a large part of Kara Sea water flows through the Laptev Sea, the 228Ra signal in the Transpolar Drift can be described as originating on the Laptev shelf. The combined freshwater inputs from the Eurasian shelves thus produce a common radium signature with a 228Ra/226Ra activity ratio of 4.0 at 20% river water. The radium signals of the individual Siberian rivers and shelves cannot be separated, but their signal is significantly different from the signal produced on the Canadian shelf (Smith et al., in press). In this respect, the radium tracers add to the information given by Barium. Moreover, with the 5.8 year half-life of 228Ra, they have the potential to serve as a tracer for the age of a water mass since its contact with the shelves.