The Maine coastal current: spring climatological circulation

Lynch, Daniel R.; Holboke, Monica J.; Naimie, Christopher E.

doi:10.1016/s0278-4343(96)00055-6

Cited by 89 publications

(84 citation statements)

References 21 publications

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“…Because of this uncertainty in the processes responsible for the autumn demise of the bloom in the eastern gulf, the present simulation ends in August and therefore the bulk of the cyst deposition in that area may not be accounted for. Nevertheless, these results suggest a Lynch et al (1997) with the addition of the Bay of Fundy gyre system as drawn in Godin (1968). Dashed white lines denote state boundaries of Maine (ME), New Hampshire (NH), and Massachusetts (MA).…”

Section: Discussionmentioning

confidence: 60%

“…Published solutions for the climatological mean circulation, broken down into six bi-monthly periods, are demonstrably consistent with available observations (Naimie, 1996;Naimie et al, 2001). Lynch et al (1997) describe simulations of the climatological springtime circulation in the Maine Coastal Current (MCC) system, which are particularly relevant to the present context. The conceptual model underlying these simulations consists of a set of interconnected segments with several branch points (Figure 1).…”

Section: Circulation Modelmentioning

confidence: 99%

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Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

McGillicuddy

Anderson

Lynch

et al. 2005

Deep Sea Research Part II: Topical Studies in Oceanography

150

132

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Observations of Alexandrium fundyense in the Gulf of Maine indicate several salient characteristics of the vegetative cell distributions: patterns of abundance are gulf-wide in geographic scope; their main features occur in association with the Maine Coastal Current; and the center of mass of the distribution shifts upstream from west to east during the growing season from April to August. The mechanisms underlying these aspects are investigated using coupled physical-biological simulations that represent the population dynamics of A. fundyense within the seasonal mean flow. A model that includes germination, growth, mortality, and nutrient limitation is qualitatively consistent with the observations. Germination from resting cysts appears to be a key aspect of the population dynamics that confines the cell distribution near the coastal margin, as simulations based on a uniform initial inoculum of vegetative cells across the Gulf of Maine produces blooms that are broader in geographic extent than is observed. In general, cells germinated from the major cyst beds (in the Bay of Fundy and near Penobscot and Casco Bays) are advected in the alongshore direction from east to west in the coastal current. Growth of the vegetative cells is limited primarily by temperature from April through June throughout the gulf, whereas nutrient limitation occurs in July and August in the western gulf. Thus the seasonal shift in the center of mass of cells from west to east can be explained by changing growth conditions: growth is more rapid in the western gulf early in the season due to warmer temperatures, whereas growth is more rapid in the eastern gulf later in the season due to severe nutrient limitation in the western gulf during that time period. A simple model of encystment based on nutrient limitation predicts deposition of new cysts in the vicinity of the observed cyst bed offshore of Casco and Penobscot Bays, suggesting a pathway of re-seeding the bed from cells advected downstream in the coastal current. A retentive gyre at the mouth of the Bay of Fundy tends to favor re-seeding that cyst bed from local populations.

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Section: Discussionmentioning

confidence: 60%

Section: Circulation Modelmentioning

confidence: 99%

Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

McGillicuddy

Anderson

Lynch

et al. 2005

Deep Sea Research Part II: Topical Studies in Oceanography

150

132

View full text Add to dashboard Cite

show abstract

“…The model is three dimensional, hydrostatic, and fully nonlinear, and a level 2.5 turbulence closure scheme (Mellor and Yamada, 1982) is incorporated in the model to study the vertical mixing of momentum, heat and mass. The calculated climatological circulation compares well with available observations (Naimie, 1996;Lynch et al, 1997). The solutions are separated into six bi-monthly periods, which form the inputs to the two-dimensional ADR (advection-diffusion-reaction) equation on the same grid.…”

Section: Introductionmentioning

confidence: 60%

“…The fine horizontal resolution around steep topography is 500 m. The model is hydrostatic, fully nonlinear, and utilizes an advanced turbulence closure. The climatological mean circulation is analyzed for six bi-monthly periods and compared with observations (Naimie, 1996;Lynch et al, 1997). The boundary conditions include no flux through solid boundaries, specifications of concentration for inflows, and computations of concentration for outflows assuming no diffusive flux (McGillicuddy et al, 1998).…”

Section: The General Circulation In the Studied Regionmentioning

confidence: 99%

Diagnosis of physical and biological control over phytoplankton in the Gulf of Maine-Georges Bank region using an adjoint data assimilation approach

Wang

Malanotte‐Rizzoli

2014

J. Ocean Univ. China

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The linkage between physical and biological processes, particularly the effect of the circulation field on the distribution of phytoplankton, is studied by applying a two-dimensional model and an adjoint data assimilation approach to the Gulf of Maine-Georges Bank region. The model results, comparing well with observation data, reveal seasonal and geographic variations of phytoplankton concentration and verify that the seasonal cycles of phytoplankton are controlled by both biological sources and advection processes which are functions of space and time and counterbalance each other. Although advective flux divergences have greater magnitudes on Georges Bank than in the coastal region of the western Gulf of Maine, advection control over phytoplankton concentration is more significant in the coastal region of the western Gulf of Maine. The model results also suggest that the two separated populations in the coastal regions of the western Gulf of Maine and on Georges Bank are self-sustaining.

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“…Различными фирмами выпускаются доплеровские радары КВ-диа-пазона (например, SeaSonde фирмы CODAR Ocean Sensors, США [2], и WERA от Helzel Messtechnik GmbH, Германия [3]), позволяющие измерять скорость поверхностных течений в прибрежной зоне от 0,5 -5 до 20 -200 км от берега с пространственным разрешением 0,5 -5 км в зависимости от диапазона ра-бочей частоты и дальности измерений. При наличии многих разнесенных вдоль берега радаров удается восстанавливать поле скорости поверхностных течений в протяженной вдоль берега полосе моря, как это делается, напри-мер, в Калифорнии, США [4].…”

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The Doppler short-wave radar applied to studying spatial structure of currents in the Black Sea

Gorbatskiy¹,

Sabinin²,

Telegin³

et al. 2017

MGZh

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The Maine coastal current: spring climatological circulation

Cited by 89 publications

References 21 publications

Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

Mechanisms regulating large-scale seasonal fluctuations in Alexandrium fundyense populations in the Gulf of Maine: Results from a physical–biological model

Diagnosis of physical and biological control over phytoplankton in the Gulf of Maine-Georges Bank region using an adjoint data assimilation approach

The Doppler short-wave radar applied to studying spatial structure of currents in the Black Sea

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