نتایج جستجو برای: north atlantic
تعداد نتایج: 184760 فیلتر نتایج به سال:
One of the most characteristic features in ocean productivity is the North Atlantic spring bloom. Responding to seasonal increases in irradiance and stratification, surface phytopopulations rise significantly, a pattern that visibly tracks poleward into summer. While blooms also occur in the Arctic Ocean, they are constrained by the sea-ice and strong vertical stratification that characterize t...
Motivated by the strong evidence that the state of the northern hemisphere vortex in boreal winter influences tropospheric variability, teleconnection patterns over the North Atlantic are defined separately for winter episodes where the zonal wind at 50 hPa and 65 N is above or below the critical velocity for vertical propagation of zonal planetary wave 1. We argue that the teleconnection struc...
Right whales carry large populations of three 'whale lice' (Cyamus ovalis, Cyamus gracilis, Cyamus erraticus) that have no other hosts. We used sequence variation in the mitochondrial COI gene to ask (i) whether cyamid population structures might reveal associations among right whale individuals and subpopulations, (ii) whether the divergences of the three nominally conspecific cyamid species o...
[1] We assessed interrelations between climatic, meteorological and hydrological factors in the Balearic Sea, and identified drivers of the abundance variability of planktonic copepods over the period 1994–2003. Temporal variability in the total abundance of copepods appears to be indicative of the southern spreading of the Northern Current, and therefore of meridional transport of water masses...
This chapter reviews tidal wetlands that occur along the Atlantic coast of the United States from the northern border of North Carolina to the northern distribution limit of mangroves in central Florida. The South Atlantic coast has a warm climate, a wide tidal range, and fewer anthropogenic impacts than the North and Central Atlantic coasts. It is a gently sloping coast that supports extensive...
Both instrumental data analyses and coupled ocean-atmosphere models indicate that Atlantic meridional overturning circulation (AMOC) variability is tightly linked to abrupt tropical North Atlantic (TNA) climate change through both atmospheric and oceanic processes. Although a slowdown of AMOC results in an atmospheric-induced surface cooling in the entire TNA, the subsurface experiences an even...
The ‘‘Panama Hypothesis’’ states that the gradual closure of the Panama Seaway, between 13 million years ago (13 Ma) and 2.6 Ma, led to decreased mixing of Atlantic and Pacific water Masses, the formation of North Atlantic Deep water and strengthening of the Atlantic thermohaline circulation, increased temperatures and evaporation in the North Atlantic, increased precipitation in Northern Hemis...
New surface water records from two high sedimentation rate sites, located in the western subtropical North Atlantic near the axis of the Gulf Stream, provide clear evidence of suborbital climate variations through marine isotope stage (MIS) 5 persisting even into the w -arm peak of the interglaciation (substage 5e). We found that the amplitude of suborbital climate oscillations did not vary sig...
In this paper we provide an estimation of the net satellite capacity needed to reliably offer In-Flight Internet services to aircraft flying in the North-Atlantic region. For this work we took into account the expected dynamic usage of AirCom (Aeronautical Communications) Internet services, the average aircraft’ cabin configurations and the characteristics of the North Atlantic routes. INTRODUC...
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