Measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C

Most deep ocean carbon flux profiles show low and almost constant fluxes of particulate organic carbon (POC) in the deep ocean. However, the reason for the non-changing POC fluxes at depths is unknown. This study presents direct measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C during a three-week experiment. The average carbon-specific respiration rate during the experiment was 0.12 ± 0.03 at 15 °C, and decreased 3.5-fold when the temperature was lowered to 4 °C. No direct influence of temperature on aggregate sinking speed was observed. Using the remineralisation rate measured at 4 °C and an average particle sinking speed of 150 m d**-1, calculated carbon fluxes were similar to those collected in deep ocean sediment traps from a global data set, indicating that temperature plays a major role for deep ocean fluxes of POC.

La musique c'est l'air, l'architecture, la lumiêre = Music is air, architecture is light [Entrevista]

La musique c'est l'air, l'architecture, la lumiêre = Music is air, architecture is light [Entrevista]

C.W. Post and Marjorie

On mat: D.H. Swartz, 600 Main Street, Fort Worth, Tex.

William C. Malley, 1890 University of Michigan football captain

Cropped from 1889 team photo.

Top Left: Mr. O.C. Sweetland. Top Right: Mrs. O.C. Sweetland. Bottom: Res. of O.C. Sweetland, Sec. 9, Lodi Tp. Michigan

Lodi Township (Mich.) residence. Publication information: Chicago, Ill. : Everts & Stewart, 1874.

Portraits of progress : Job Training Partnership Act.

Mode of access: Internet.

Roman portraits.

Text signed: Gisela M. A. Richter.

Betänkande angående gemensamt lönesystem samt lönereglering för postverket : telegrafverket, statens järnvägar och statens vattenfallsverk avgivet enligt det av Kungl. Maj: t den 28 juni 1918 lämnade uppdrag.

C. Ekman, ordförande; A. Hamilton, sekreterare.

Auguste Ravier, peintre, MDCCXIV-MDCCXCV : portraits de l'artiste et très nombreuses reproductions de ses dessins et de ses croquis /

Mode of access: Internet.

Bahram Gur and the Indian Princess in the Dark Palace on Saturday", Folio 23v from a Haft Paikar (Seven Portraits) of the Khamsa (Quintet) of Nizam

Manuscript, Islamic, Timurid; 8 1/2 in.x 4 39/64 in. (image); ink, opaque watercolor and gold on paper

Portraits of the seventies /

Includes bibliographical references.

Skrifter utgivna av Humanistiska vetens-kapssamfundet; Lund.

Acta Societatis humaniorum litterarum Lundensis.

Vies et oeuvres des peintres les plus célèbres de toutes les écoles, recueil classique, contenant l'oeuvre complète des peintres du premier rang, et leurs portraits... /

Contiene: t. 1, t. 2, t. 5.