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Phosphate concentration in bottom water and diffusion coefficient at the sediment-water interface at stations in the Norwegian-Greenland Sea (Tabelle 5.4)

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.206384
Keywords
  • 14
  • 16
  • 20
  • 21
  • 22
  • 25
  • 26
  • Ark-X/1
  • Ark-Xi/2
  • Diffusion Coefficient
  • Global Environmental Change: The Northern North Atlantic
  • M36/3
  • M36/3_201
  • M36/3_203
  • Meteor (1986)
  • Multicorer
  • Multiple Investigations
  • Ocean Bottom Hydrophone
  • Oxygen Profiler
  • Phosphate
  • Phosphate Flux Per Year
  • Polarstern
  • Porosity
  • Ps31
  • Ps31/014-13
  • Ps31/016-8
  • Ps31/020-12
  • Ps31/025-13
  • Ps31/026-1
  • Ps31/054-4
  • Ps31/084-2
  • Ps31/087-3
  • Ps31/089-5
  • Ps31/092-1
  • Ps31/097-5
  • Ps31/110-2
  • Ps37
  • Ps37/014
  • Ps37/016
  • Ps37/020
  • Ps37/021
  • Ps37/022
  • Ps37/025
  • Ps37/026
  • Sfb313
Disciplines
  • Chemistry
  • Ecology
  • Geography

Abstract

11thDSBS.cdr TIME SERIES DATA, PART I The decrease of sea-ice extent and thickness in the Arctic in the past decades is statistically significant. At the same time, water temperatures in Fram Strait constantly increased. Our temperature records covering the years 2001 through 2005 exhibited not only seasonal variations but also an overall slight temperature increase, even at 2500 m water depth at the central HAUSGARTEN site. FIRST RESULTSFIRST RESULTS Temporal development (between 2000 and 2005) of concentrations in chloroplastic pigment equivalents = phytodetrital input (top), organic carbon (center), and total microbial biomass (bottom) in sediments along HAUSGARTEN depth transect. Sea-ice anomalies in the northern hemisphere between 1978 and 2005. (source: http://arctic.atmos.uiuc.edu/cryosphere) CORE MEASUREMENTS Pelagic Zone: particle flux (biogenic, lithogenic), currents (speed, direction), phytoplankton Sediment-Water-Interface: carbon remineralisation (oxygen microelectrodes, sediment community oxygen consumption), nutrient fluxes Near-Bottom Zone: oxygen concentrations, nutrients, bacterial densities, near-bottom currents in high-resolution BACKGROUND The past decades has seen remarkable changes in the Arctic. The decrease of sea-ice extent and sea-ice thickness is statistically significant; large physical and chemical variations in the upper and intermediate layers of the ocean are notable. Arctic organisms are adapted to extreme environmental conditions and the increasingly rapid rate of recent climate change poses new challenges to the resilience of arctic life. To detect and track the impact of environmental changes at a deep-sea site, the German Alfred Wegener Institute for Polar and Marine Research established HAUSGARTEN, representing the first, and by now only open-ocean long-term observatory in a polar region. LOCATION HAUSGARTEN was established in summer 1999 about 150 km west of Svalbard. It consists of 15 sampling sites along a depth transect

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