منابع مشابه
Skewness modes in the Northern Hemisphere winter
The probability distribution of daily Northern Hemisphere streamfunction fluctuations at 500 hPa in winter is skewed at most locations. Large positive anomalies are more likely north of 50N with maximum values of the skewness in the North Pacific and North Atlantic region. In this study we develop two novel methodologies in order to diagnose the underlying circulation structures associated with...
متن کاملBaroclinic annular variability in the Northern Hemisphere
1 Large-scale variability in the Northern Hemisphere (NH) circulation can be 2 viewed in the context of three primary types of structures: 1) teleconnection patterns; 2) 3 a barotropic annular mode; and 3) a baroclinic annular mode. The barotropic annular 4 mode corresponds to the northern annular mode (NAM) and has been examined 5 extensively in previous research. Here we examine the spatial s...
متن کاملForest Carbon Sinks in the Northern Hemisphere
There is general agreement that terrestrial systems in the Northern Hemisphere provide a significant sink for atmospheric CO2; however, estimates of the magnitude and distribution of this sink vary greatly. National forest inventories provide strong, measurement-based constraints on the magnitude of net forest carbon uptake. We brought together forest sector C budgets for Canada, the United Sta...
متن کاملNorthern Hemisphere tropical cyclone activity
[1] Recent historical Northern Hemisphere (NH) tropical cyclone (TC) inactivity is compared with strikingly large observed variability during the past three decades. Yearly totals of the combined active-basin NH accumulated cyclone energy (ACE) are highly correlated with boreal spring seasurface temperature (SST) in the North Pacific Ocean and are representative of an evolving dual-gyre, trans-...
متن کاملChanging Northern Hemisphere Snow Seasons
Spatial and temporal patterns in the onset, offset, and length of the snow season across Northern Hemisphere continents are examined for the period from 1967 to 2008. Full snow seasons (FSS) and core snow seasons (CSS) are defined based on the consistency of snow cover within a location over the course of the cold season. Climatologically, the seasonal onsets of FSS and CSS progress more rapidl...
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ژورنال
عنوان ژورنال: Nature
سال: 1925
ISSN: 0028-0836,1476-4687
DOI: 10.1038/116206a0