58971. |
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58972. |
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58973. |
- Körling, Gabriella, et al.
(författare)
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Megaprojekt : en inledning
- 2021
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Ingår i: Megaprojekt. - Stockholm : SSAG Sällskapet för Antropologi och Geografi. - 9789198215076
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Bokkapitel (populärvet., debatt m.m.)
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58974. |
- Körling, Gabriella, et al.
(författare)
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“Tout a été loti!”: Decentralisation, Land Speculation and Urban Expansion in Niamey, Niger
- 2020
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Ingår i: kritisk etnografi. - 2003-1173. ; 2:1-2, s. 67-79
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Tidskriftsartikel (refereegranskat)abstract
- In and around Niamey, land has emerged as a central source of economic and political capital and as the object of intense competition. Land speculation has accelerated with the decentralisation of land management including zoning or land subdivision operations (lotissement) whereby rural land such as agricultural fields are transformed into land plots mainly for housing. The multiplication of actors involved in zoning has led to an unprecedented competition over land on the urban fringe, involving a multitude of actors including municipalities, private and public enterprises, private entrepreneurs and individual land speculators, national politicians, customary landowners and other brokers and intermediaries. With the rapid proliferation of public and private zoning operations, zoning and land management have also quickly become central question in local and municipal politics, engendering conflicts, competition and contestation. In this paper we analyse the economic, political and spatial stakes of land management in the periphery of Niamey. We show that land speculation is part of a wider struggle for political and economic influence that is reshaping local political arenas and rapidly transforming the urban periphery.
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58975. |
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58976. |
- Körnich, Heiner, et al.
(författare)
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A simple model for the interhemispheric coupling of the middle atmosphere circulation
- 2010
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Ingår i: Advances in Space Research. - : Elsevier Ltd.. - 0273-1177 .- 1879-1948. ; 45:5, s. 661-668
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Tidskriftsartikel (refereegranskat)abstract
- The interhemispheric coupling of the middle atmosphere general circulation is characterized by a global anomaly pattern of the zonal-mean temperature. This pattern reflects an anomalous stratospheric and mesospheric residual circulation, in which a weaker (stronger) stratospheric winter circulation is linked to an upward (downward) shift of its upper mesospheric branch reaching from the summer to the winter pole. This phenomenon is robust in observational data and several middle atmosphere general circulation models. In the present study, the recently proposed mechanism of the interhemispheric coupling is unequivocally proven within the framework of a zonally symmetric model that excludes any additional effects due to resolved waves and non-zonally propagating gravity waves. Two simulations are conducted that differ in the strength of the polar vortex. A weaker polar vortex results in a downward shift of the winter mesospheric gravity wave drag. This leads to changes also in the summer upper mesosphere via a feedback solely between gravity wave breaking and the zonal-mean state. The accompanying temperature anomaly reproduces the pattern of the interhemispheric coupling. (C) 2009 COSPAR.
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58977. |
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58978. |
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58979. |
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58980. |
- Körnich, Heiner, 1971-
(författare)
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Predictability of the coupled troposphere-stratosphere system
- 2010
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Ingår i: Seminar on Predictability in the European and Atlantic regions from days to years.. - Reading, UK. : ECMWF.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Tropospheric predictability is typically limited to about 20 days due to the chaotic nature of weather. The tropospheric variability contains planetary waves which can propagate vertically into the winter stratosphere, where they break and drive a residual meridional circulation. For cases of exceptionally strong planetary wave activity, this circulation can induce a polar stratospheric warming and a subsequent downward propagation of the circulation anomaly to the troposphere. This process provides an increased predictability for the troposphere. The predictability is associated with the zonal mean zonal wind around 60ºN and the Northern Annular Mode, which tends to a negative phase after a stratospheric warming event. The negative Northern Annular Mode phase yields colder temperatures in Mid- and Northern Europe. Thus, the coupled troposphere-stratosphere system improves tropospheric predictability on monthly to seasonal time-scales. This article reviews briefly the observed phenomena, the current theoretical understanding, and the role for numerical weather prediction.
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