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- W2049964694 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 269:91-99 (2004) - doi:10.3354/meps269091 Red Sea gravity currents cascade near-reef phytoplankton to the twilight zone Helge Niemann1,4,*, Claudio Richter1, Henk M. Jonkers2, Mohammad I. Badran3 1Center for Tropical Marine Ecology, Fahrenheitstr. 6, 28359 Bremen, Germany 2Max Planck Institute for Marine Microbiology, Celsiusstr. 1, 28359 Bremen, Germany 3Marine Science Station, The University of Jordan and Yarmouk University, PO Box 195, Aqaba, Jordan 4Present address: Max Planck Institute for Marine Microbiology, Celsiusstr. 1, 28359 Bremen, Germany *Email:hniemann@mpi-bremen.de ABSTRACT: Cross-reef variations of sea water density, currents and phytoplankton pigments were investigated in the northern Gulf of Aqaba, Red Sea. Differential cooling of near- and offshore surface water during cold winter nights results in cross-shore gradients of density (σ-t) triggering gravity currents which cascade downslope along sandy valleys. Two 4-wk deployments of 3-D acoustic current meters showed that cross-shore currents near the sea bed (35 and 90 m) were 2- to 5-fold higher than long-shore currents, inversely related to surface flow and highly correlated with seasonally detrended diel variations in seawater temperature. Cross-shore flow varied during the course of the night, with offshore pulses of up to 15 cm s-1 associated with sudden temperature drops of ~0.15°C. Spatial distribution of chl a pigments shows that phytoplankton enriched nearshore waters are entrained in the gravity currents to depths >300 m. Gravity currents may therefore provide an important and previously overlooked pathway of reef-borne material to the food-impoverished deeper strata of the Red Sea. KEY WORDS: Gulf of Aqaba · Red Sea · Gravity currents · Density cascading · Advection · Phytoplankton · Chl a · Coral reef ecology Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 269. Online publication date: March 25, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research." @default.
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- W2049964694 title "Red Sea gravity currents cascade near-reef phytoplankton to the twilight zone" @default.
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