A contribution to the study of action centres in the North Atlantic

Sahsamanoglou, H. S.

doi:10.1002/joc.3370100303

Cited by 59 publications

(42 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the instrumental period, the Bermuda high has exhibited multidecadal variability in both mean location and mean central pressure (Sahsamanoglou 1990;Davis et al 1997;Anchukaitis et al 2006), with associated impacts on moisture advection into the Southeast and Gulf Coast regions. Keim (1997) provides a description of the basic dynamics behind the influence of the Bermuda high on low-level atmospheric stability and warm-season extreme rainfall events in the two regions.…”

Section: Introductionmentioning

confidence: 99%

Ocean–Atmosphere Influences on Low-Frequency Warm-Season Drought Variability in the Gulf Coast and Southeastern United States

Ortegren

Knapp

Maxwell

et al. 2011

Journal of Applied Meteorology and Climatology

View full text Add to dashboard Cite

From the 344 state climate divisions in the conterminous United States, nine distinct regions of warm-season drought variability are identified using principal component analysis. The drought metric used is the Palmer hydrological drought index for the period 1895-2008. The focus of this paper is multi-decadal drought variability in the Southeast (SEUS) and eastern Gulf South (EGS) regions of the United States, areas in which the lowfrequency forcing mechanisms of warm-season drought are still poorly understood. Low-frequency drought variability in the SEUS and EGS is associated with smoothed indexed time series of major ocean-atmosphere circulation features, including two indices of spatiotemporal variability in the North Atlantic subtropical anticyclone (Bermuda high). Long-term warm-season drought conditions are significantly out of phase between the two regions. Multi-decadal regimes of above-and below-average moisture in the SEUS and EGS are closely associated with slow variability in sea surface temperatures in the North Atlantic Ocean and with the summer mean position and mean strength of the Bermuda high. Multivariate linear regression indicates that 82%-92% of the low-frequency variability in warm-season moisture is explained by two of the three leading principal components of low-frequency variability in the climate indices. The findings are important for water resource managers and water-intensive industries in the SEUS and EGS. The associations identified in the paper are valuable for enhanced drought preparedness and forecasting in the study area and potentially for global models of coupled ocean-atmosphere variability.

show abstract

Section: Introductionmentioning

confidence: 99%

Ocean–Atmosphere Influences on Low-Frequency Warm-Season Drought Variability in the Gulf Coast and Southeastern United States

Ortegren

Knapp

Maxwell

et al. 2011

Journal of Applied Meteorology and Climatology

View full text Add to dashboard Cite

show abstract

“…The Greenland Ice Sheet Icelandic Low follows the shape of an ellipse, with the location of greatest probability being near O0øN and between 300 and 50øW [Sahsamanoglou, 1990] …”

Section: Introductionmentioning

confidence: 99%

Aspects of climate variability in the North Atlantic sector: Discussion and relation to the Greenland Ice Sheet Project 2 high‐resolution isotopic signal

Barlow¹,

Rogers²,

Serreze³

et al. 1997

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. This paper reviews aspects of climate variability in the North Atlantic sector that may influence the seasonal to decadal scale isotopic signal in the Greenland Ice Sheet Project 2 (GISP2) ice core. Interpretation of the isotopic signal and its spatial applicability at the seasonal level requires investigation into synoptic scale climatology. We discuss possible climatic influences of (1) likely source regions of precipitation reaching the GISP2 site, (2) the characteristics of cyclone activity over the North Atlantic sector, and (3) changes in major atmospheric features such as the mean sea level Icelandic Low and Azores High pressure systems, the North Atlantic Oscillation, and the Ba•n trough. Next, we evaluate correlations between the GISP2 deuterium isotopic signal and coastal temperatures with atmospheric pressure patterns, thereby deriving climatic interpretations of the high-resolution isotopic record. The GISP2 site is influenced by both the Icelandic Low to the southeast and Davis Strait/Ba•n Bay storms to the southwest and west. The North Atlantic Oscillation influences the GISP2 isotopic signal through the seesaw in winter temperatures between west Greenland and northern Europe. Agreement in excursion directions of GISP2 isotopes and east Greenland and Iceland temperature records is associated with different positions of the Ba•n trough in winter and also with anomalous 500-mbar net geostrophic flow. Linkages between isotopic excursion direction and atmospheric variability need to be explored further by comparison with additional seasonal data sets from other Greenland ice cores.

show abstract

“…As shown in Fig. 9 the SLP fields feature a prevailing low system in the 50° -70°N region with a center nearby the Icelandic Islands which is known as the Icelandic low (e.g., Sahsamanoglou 1990;Serreze et al 1997;Ahrens 2005). This low extends from the northeast to the southwest with dominant well-organized patterns in winter, spring and fall.…”

Section: Seasonal Climate In the North Atlanticmentioning

confidence: 98%

Seasonal Climate Associated with Major Shipping Routes in the North Pacific and North Atlantic

Chen¹,

Tan²,

Hsieh³

et al. 2014

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

The major shipping routes in the North Pacific (NP) and North Atlantic (NA) are analyzed via ship-reported records compiled by the International Comprehensive Ocean-Atmosphere Data Set (ICOADS). The shipping route seasonal characteristics and associated climatic features are also examined. In the NP, the dominant cross-basin route takes a great-circle path between East Asia and North America along 54°N north of the Aleutian Islands throughout the year. This route penetrates the Aleutian low center where ocean waves and winds are relatively weaker than those in the low's southern section south of 50°N. Moreover, the Earth's spherical shape makes a higher-latitude route shorter in navigational distance across the NP than a lower-latitude route. Two additional mid-latitude routes through the 40° -50°N region appear in summer when the Aleutian low vanishes. In the NA, the major shipping routes form an X-shaped pattern in the oceans south of 40°N to connect North America/the Panama Canal and the Mediterranean Sea/the British Isles and Europe. These major shipping routes are far from the influence of the Icelandic low and thus are used throughout the year due to the stability in marine conditions and their general efficiency. A third and more zonal route appears to the north of the X-shaped routes in the 40° -50°N region. Weak influence from the Icelandic low on marine conditions during summer and spring means that more ships take this route in summer and spring than in winter and fall.

show abstract

A contribution to the study of action centres in the North Atlantic

Cited by 59 publications

References 12 publications

Ocean–Atmosphere Influences on Low-Frequency Warm-Season Drought Variability in the Gulf Coast and Southeastern United States

Ocean–Atmosphere Influences on Low-Frequency Warm-Season Drought Variability in the Gulf Coast and Southeastern United States

Aspects of climate variability in the North Atlantic sector: Discussion and relation to the Greenland Ice Sheet Project 2 high‐resolution isotopic signal

Seasonal Climate Associated with Major Shipping Routes in the North Pacific and North Atlantic

Contact Info

Product

Resources

About