Multiple Causes of the North American Abnormal Winter 1976–77

Namias, Jerome

doi:10.1175/1520-0493(1978)106<0279:mcotna>2.0.co;2

Cited by 198 publications

(82 citation statements)

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“…The water column concentration and calculated flux of particulates were very low compared to mean productivity estimates (Moore et al,1973) and to measured sediment trap fluxes and sedimentation rates (5 cm/1000 yr, Cobler and Dymond,1980). Namias(1978) has shown that 1978 was a "Nino" year and the normal flux of Peru upwelling water was absent at this station. The net flux of organic carbon out of the 40 meter mixed layer was calculated to be 130 mg C/m2-day which can be taken as a minimum estimate of the productivity.…”

Section: Eastern Equatorial Pacific Samplesmentioning

confidence: 89%

The trace element geochemistry of marine biogenic particulate matter

Collier

Edmond

1984

Progress in Oceanography

412

217

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Section: Eastern Equatorial Pacific Samplesmentioning

confidence: 89%

The trace element geochemistry of marine biogenic particulate matter

Collier

Edmond

1984

Progress in Oceanography

412

217

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“…Results suggest that the January NHCPV was largest in 1977, an anomalously cold winter in the Northern Hemisphere (Namias, 1978), and smallest in 1967 (Figures 2(a) and (b)). Likewise, it was most circular in 1975 and least circular in 1963 (Figures 2(c) and (d)).…”

Section: Nhcpv Area Circularity and Positionmentioning

confidence: 98%

January northern hemisphere circumpolar vortex variability and its relationship with hemispheric temperature and regional teleconnections

2005

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Variability in the hemispheric-scale atmospheric circulation can be directly linked to variations in surface environmental features, such as temperature, precipitation, salinity of water bodies, and pollutant transport. One indicator of the behavior of the hemispheric-scale circulation is the circumpolar vortex (CPV). This research utilizes a geographic information system approach to characterize variability in the Northern Hemispheric (NH) CPV. Specifically, the area, shape, and centroid of the January NHCPV are analyzed for 1959-2001 because it may provide insight about relationships between hemispheric-scale circulation and global temperature change. We also use a new means of characterizing the hemisphericscale circulation using a 'circularity ratio' (R c ). Results suggest that the January NHCPV has exhibited no long-term trends in area or shape, and that the mean centroid is positioned at approximately 85.3°N, 178.0°W. Regional patterns emerge, which suggest that the area and circularity are associated with variability in surface temperature and moist static energy. Furthermore, the area of the January NHCPV is associated with variability in the Arctic Oscillation, while the shape is tied to variability in the Pacific-North American teleconnection pattern. These results will facilitate understanding of the relationship between hemispheric-scale circulation, regional circulation, and local temperatures.

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“…Alternatively, large snow covered areas can cause adiabatic cooling of overlying air leading to geopotential height anomalies (Walsh et al, 1982), consequently altering upper level trough and ridge location. Thus, the anomalous snow cover may produce a feedback type situation leading to changes in characteristic atmospheric circulation patterns (Namias, 1978).…”

Section: The Significance Of Snow Covermentioning

confidence: 99%

European snow cover extent variability and associations with atmospheric forcings

Henderson

Leathers

2010

Intl Journal of Climatology

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Snow cover in Europe represents an important component of the region's climatic system. Variability in snow cover extent can have major implications on factors such as low-level atmospheric temperatures, soil temperatures, soil moisture, stream discharge, and energy allocation involved in the warming and melting of the snowpack. The majority of studies investigating Northern Hemisphere snow cover identify European snow cover extent as a portion of the Eurasian record, possibly masking complexities of this subset. This study explores the variability of European snow cover extent from 1967-2007, with the region in question including the area of Europe extending eastward to the Ural Mountains (60°E). Using the 89 × 89 gridded National Oceanic and Atmospheric Administration (NOAA) Northern Hemisphere weekly satellite snow cover product, area estimates of seasonal snow cover were calculated, and their relationship to gridded temperature, precipitation, and sea-level pressure data analysed. The spatial variability of snow cover extent was also explored using geographical information systems (GIS). The combined results from both surface temperature and precipitation analyses point towards snow cover extent in Europe being primarily temperature dependent. Atmospheric variables associated with extremes in snow cover extent were investigated. Large (small) European snow extent is associated with negative (positive) 850 hPa zonal wind anomalies, negative (positive) European 1000-500 hPa thickness anomalies, and generally positive (negative) Northern European precipitation anomalies. Sea-level pressure and 500 hPa results indicate strong associations between large (small) snow cover seasons and the negative (positive) phase of the North Atlantic Oscillation.

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Multiple Causes of the North American Abnormal Winter 1976–77

Cited by 198 publications

References 0 publications

The trace element geochemistry of marine biogenic particulate matter

The trace element geochemistry of marine biogenic particulate matter

January northern hemisphere circumpolar vortex variability and its relationship with hemispheric temperature and regional teleconnections

European snow cover extent variability and associations with atmospheric forcings

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