Mary Jo Richardson

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The primary means of determining particulate organic carbon (POC) concentrations in aquatic environments is by filtering from water bottles or by in situ filtration with pumps and analyzing the filters. The concentrations measured by these two methods, however, can differ by a factor of 1.2–5 in temperate waters, and by factors as large as 200 in cold,(More)
As part of the North Atlantic Bloom Experiment (NABE), CTD/transmissometer profiles were made on two cruises at 47°N, 20°W in spring 1989 to quantify the increase in particles during a phytoplankton bloom in relationship to biophysical forcing factors. Water samples were filtered to obtain particle mass concentrations for calibration of beam attenuation(More)
As part of the U.S. JGOFS EqPac process study beam c profiles were obtained during two time-series occupations of the equator at 14o " W ('IT008 and lTO12). CTD/transmissometer profiles were routinely performed three times a day, roughly at dawn, noon, and just prior to sunset. Additionally, 'die1 experiment' days of intensive profiling (every 3 h) were(More)
Several SeaWiFS products have been compared with shipboard data to assess the possibility of using remote sensing to estimate particulate organic carbon (POC) concentration in surface waters. Transmissometer data were collected during six South Atlantic Ventilation Experiment (SAVE) hydrographic expeditions conducted between November 1987 and March 1989(More)
The near-bottom sedimentation rates were measured by placing cylindrical sediment traps 10 m above the sea floor on each of six moorings deployed between 4100 and 5100 m along a transect across an energetic deep-sea current in the HEBBLE area centered at 40°N, 63°W on the Nova Scotian Rise. Sedimentation rates above the sea floor were monitored with(More)
An integrated study using current meters, time-series nephelometers, and water samplers fi~r measurements of particulate matter concentration revealed an intense nepheloid layer centered on the slopes of the Eastward Scarp-the northeastern boundary of the Bermuda Rise. These slopes also contained extensive furrows, truncated seismic reflectors, and(More)
  • Jack Dymond, Kathy Fischer, Milo Clauson, Richard Cobler, Wilford Gardner, Mary Jo Richardson +3 others
  • 2002
Four sediment traps of radically different design were deployed in the Santa Barbara Basin for approximately 45 days. The measured fluxes ranged from 370 to 774 g m-2 yr I for the different designs. These values lie within flux measurements previously determined for the basin. Compared to the 25-year record (920 g m-2 yr-i), however, all fluxes determined(More)
The standing stock of particulate organic carbon (POC) was determined during "ve cruises in the Ross Sea in 1996 and 1997 and compared with primary production of carbon measured in short-term C-incubations and the #ux of organic carbon collected in moored sediment traps. POC concentrations were estimated from transmissometer pro"les that were calibrated(More)
In this study, we examined possible impacts of the Yangtze River Three Gorges Dam (TGD), the world largest hydroelectric construction, on the adjacent marine ecosystem of the East China Sea (ECS) during its initial water storage period. The TGD filled the first one-third of its storage capacity of 39 billion m3 in 10 days in June 2003, causing an abrupt(More)