Browsing by Author "Cullen, JJ"
Now showing items 1-7 of 7
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Impact of ultraviolet radiation on marine crustacean zooplankton and ichthyoplankton: a synthesis of results from the estuary and Gulf of St. Lawrence, Canada
Browman, HI; Rodriguez, CA; Beland, F.; Cullen, JJ; Davis, RF; Kouwenberg, JHM; Kuhn, PS; McArthur, B.; Runge, JA; St-Pierre, JF; Vetter, RD (2000)The objectives of the research program reported upon here were (1) to measure ambient levels of UV radiation and determine which variables most strongly affected its attenuation in the waters of the estuary and Gulf of St. ... -
Inhibition of marine photosynthesis by ultraviolet radiation: Variable sensitivity of phytoplankton in the Weddell-Scotia Confluence during the austral spring
Neale, PJ; Cullen, JJ; Davis, RF (1998-05)To assess the potential impacts of ozone depletion on photosynthesis in the Southern Ocean, we need to know more about effects of ultraviolet radiation (UV) on phytoplankton in Antarctic waters, where, in addition to ... -
Mapping coastal optical and biogeochemical variability using an autonomous underwater vehicle and a new bio-optical inversion algorithm
Brown, CA; Huot, Y.; Purcell, MJ; Cullen, JJ; Lewis, MR (2004-08)Autonomous underwater vehicles (AUVs) can map water conditions at high spatial ( horizontal and vertical) and temporal resolution, including under cloudy conditions when satellite and airborne remote sensing are not feasible. ... -
New algorithms for MODIS sun-induced chlorophyll fluorescence and a comparison with present data products
Huot, Y.; Brown, CA; Cullen, JJ (2005-02)We discuss important sources of variability in sun-induced chlorophyll fluorescence and examine difficulties in deriving fluorescence data products from satellite imagery, with a focus on the MODerate-resolution Imaging ... -
Primary production by suspended and benthic microalgae in a turbid estuary: Time-scales of variability in San Antonio Bay, Texas
MacIntyre, HL; Cullen, JJ (1996-12)The within-day, between-day and month-to-month variability of light attenuation and microalgal chlorophyll a (chl a) and photosynthetic response was measured in San Antonio Bay, Texas, USA. Waters were shallow (<2 m) ... -
A semi-analytical model of the influence of phytoplankton community structure on the relationship between light attenuation and ocean color
Ciotti, AM; Cullen, JJ; Lewis, MR (1999-01)A model was developed to examine the influence of phytoplankton community structure on the relationship between diffuse attenuation and ratios of upwelling radiance. Shifts in phytoplankton communities were represented by ... -
The spectral effects of clouds on solar irradiance
Bartlett, JS; Ciotti, AM; Davis, RF; Cullen, JJ (1998-12)Knowledge of the spectral attenuation associated with clouds is important for accurate estimates of natural irradiance at the Earth's surface. We compare spectral measurements of visible downwelling irradiance, under varying ...