scholarly journals Role of Resolved and Parameterized Eddies in the Labrador Sea Balance of Heat and Buoyancy

2014 ◽  
Vol 44 (12) ◽  
pp. 3008-3032 ◽  
Author(s):  
Oleg A. Saenko ◽  
Frédéric Dupont ◽  
Duo Yang ◽  
Paul G. Myers ◽  
Igor Yashayaev ◽  
...  
Keyword(s):  
High Resolution ◽  
West Coast ◽  
Heat Budget ◽  
Deep Convection ◽  
Mesoscale Eddies ◽  
Global Ocean ◽  
Labrador Sea ◽  
Low Resolution ◽  
The West

Abstract Deep convection in the Labrador Sea is an important component of the global ocean ventilation. The associated loss of heat to the atmosphere from the interior of the sea is thought to be mostly supplied by mesoscale eddies, generated either remotely or as a result of convection itself—processes that are not resolved by low-resolution ocean climate models. The authors first employ a high-resolution (°) ocean model forced with high-resolution (33 km, 3 h) atmospheric fields to further elaborate on the role of mesoscale eddies in maintaining the balance of heat and buoyancy in the Labrador Sea. In general agreement with previous studies, it is found that eddies remove heat along the coast and supply it to the interior. Some of the eddies that are generated because of the barotropic instability off the west coast of Greenland are recaptured by the boundary current. In the region of deep convection, the convergence of heat and buoyancy by eddies significantly increases with the deepening of the winter mixed layer. In addition, the vertical eddy flux plays an important part in the heat budget of the upper Labrador Sea, accounting for up to half of the heat loss to the atmosphere north of 60°N. A low-resolution (1°) model with parameterized eddies is then applied to show that it does capture, qualitatively, the general structure of eddy buoyancy advection along the Labrador Current. However, the 1° model is deficient in this regard in the most eddy active region off the west coast of Greenland, although some improvements can be made by forcing it with the high-resolution atmospheric fields.

Decadal changes in the Atlantic Meridional Overturning Circulation in high-resolution simulations of the subpolar North Atlantic

2021 ◽  
Author(s):  
Claus W. Böning ◽  
Arne Biastoch ◽  
Klaus Getzlaff ◽  
Patrick Wagner ◽  
Siren Rühs ◽  
...  
Keyword(s):  
High Resolution ◽  
North Atlantic ◽  
Deep Convection ◽  
Alternative Interpretation ◽  
Meridional Overturning Circulation ◽  
Global Ocean ◽  
Labrador Sea ◽  
Overturning Circulation ◽  
First Results ◽  
Meridional Overturning

<p>A series of global ocean - sea ice model simulations is used to investigate the spatial structure and temporal variability of the sinking branch of the meridional overturning circulation (AMOC) in the subpolar North Atlantic. The experiments include hindcast simulations of the last six decades based on the high-resolution (1/20°) VIKING20X-model forced by the CORE and JRA55-do reanalysis products, supplemented by sensitivity studies with a 1/4°-configuration (ORCA025) aimed at elucidating the roles of variations in the wind stress and buoyancy fluxes. The experiments exhibit different multi-decadal trends in the AMOC, reflecting the well-known sensitivity of ocean-only models to subtle details in the configuration of the subarctic freshwater forcing. All experiments, however, concur in that the dense, southward branch of the overturning is mainly fed by “sinking” (in density space) in the Irminger and Iceland Basins, in accordance with the first results of the OSNAP observational program. Remarkably, the contribution of the Labrador Sea has remained small throughout the whole simulation period, even during the phase of extremely strong convection in the early 1990s: i.e., the rate of deep water exported from the subpolar North Atlantic by the DWBC off Newfoundland never differed by more than O(1 Sv) from the DWBC entering the Labrador Sea at Cape Farewell. The model solutions indicate a particular concentration of the sinking along the deep boundary currents south of the Denmark Straits and south of Iceland, pointing to a prime importance for the AMOC of the outflows from the Nordic Seas and their subsequent enhancement by the entrainment of intermediate waters. Since these include the water masses formed by deep convection in the Labrador and southern Irminger Seas, our study offers an alternative interpretation of the dynamical role of decadal changes in Labrador Sea convection intensity in terms of a remote effect on the deep transports established in the outflow regimes.</p>

scholarly journals Impact of Shelf–Basin Freshwater Transport on Deep Convection in the Western Labrador Sea

2011 ◽  
Vol 41 (11) ◽  
pp. 2187-2210 ◽  
Author(s):  
Timothy McGeehan ◽  
Wieslaw Maslowski
Keyword(s):  
High Resolution ◽  
Arctic Ocean ◽  
Deep Convection ◽  
Ocean Model ◽  
Meridional Overturning Circulation ◽  
The Arctic ◽  
Global Ocean ◽  
Labrador Sea ◽  
Freshwater Flux ◽  
The Arctic Ocean

Abstract Freshwater exiting the Arctic Ocean through the Canadian Arctic Archipelago (CAA) has been shown to affect meridional overturning circulation and thereby the global climate system. However, because of constraints of spatial resolution in most global ocean models, neither the flow of low salinity water through the CAA to the Labrador Sea nor the eddy activity that may transport freshwater from the shelf to areas of open ocean convection can be directly simulated. To address these issues, this study uses a high-resolution ice–ocean model of the pan-Arctic region with a realistic CAA and forced with realistic atmospheric data. This model resolves conditions in the Arctic Ocean upstream of the Labrador Sea and is coupled to a thermodynamic–dynamic sea ice model that responds to the atmospheric forcing. The major shelf–basin exchange of liquid freshwater occurs south of Hamilton Bank, whereas the largest ice flux occurs in the northwest of the basin. Freshwater flux anomalies entering the Labrador Sea through Davis Strait do not immediately affect deep convection. Instead, eddies acting on shorter time scales can move freshwater to locations of active convection and halt the process. Convection is modulated by the position of the ice edge, highlighting the critical need for a coupled ice–ocean model. Finally, the size of eddies and the short duration of events demonstrate the need for high resolution, both spatial and temporal.

Ecological Identity, Empathy, and Experiential Learning: A Young Child's Explorations of a Nearby River

2018 ◽  
Vol 34 (2) ◽  
pp. 143-158 ◽  
Author(s):  
Chloe Humphreys ◽  
Sean Blenkinsop
Keyword(s):  
British Columbia ◽  
Experiential Learning ◽  
Environmental Education ◽  
West Coast ◽  
Natural World ◽  
Ecological Identity ◽  
The West ◽  
Working Together ◽  
Journal Entries

AbstractThis article uses an unconventional format to explore the role of parent and nature and the development of a young child's ecological identity. It follows journal entries from a mother observing her young son, Julian, as he explores, interacts with, and learns from the Stawamus River on the west coast of British Columbia. By creating questions, discussing and analysing these written observations, we explore the role of parenting and nature and the implications this might have for environmental education. Some of the ideas explored in this article include early ecological identity, empathy, relational existence, experiential learning, and affordances in the natural world. We further suggest that nature and parent working together might become key educators for a child.

Assessing the Roles of Three Eddy Types in Restratifying the Labrador Sea after Deep Convection

2011 ◽  
Vol 41 (11) ◽  
pp. 2102-2119 ◽  
Author(s):  
Renske Gelderloos ◽  
Caroline A. Katsman ◽  
Sybren S. Drijfhout
Keyword(s):  
Time Scales ◽  
Deep Convection ◽  
Early Spring ◽  
Labrador Sea ◽  
Boundary Current ◽  
Key Factors ◽  
The West ◽  
Warm Core ◽  
Water Formation ◽  
Dense Water Formation

Abstract Restratification after deep convection is one of the key factors in determining the temporal variability of dense water formation in the Labrador Sea. In the subsurface, it is primarily governed by lateral buoyancy fluxes during early spring. The roles of three different eddy types in this process are assessed using an idealized model of the Labrador Sea that simulates the restratification season. The first eddy type, warm-core Irminger rings, is shed from the boundary current along the west coast of Greenland. All along the coastline, the boundary current forms boundary current eddies. The third type, convective eddies, arises directly around the convection area. In the model, the latter two eddy types are together responsible for replenishing 30% of the winter heat loss within 6 months. Irminger rings add another 45% to this number. The authors’ results thus confirm that the presence of Irminger rings is essential for a realistic amount of restratification in this area. The model results are compared to observations using theoretical estimates of restratification time scales derived for the three eddy types. The time scales are also used to explain contradicting conclusions in previous studies on their respective roles.

Dis/connection: Violence, Religion, and Geographic Imaginings in Aceh and Colonial Indonesia, 1890s–1920s

Itinerario ◽  
2021 ◽  
pp. 1-24
Author(s):  
David Kloos
Keyword(s):  
West Coast ◽  
Colonial Discourse ◽  
The West ◽  
Dangerous Place ◽  
Colonial Violence ◽  
Colonial Frontier

This article draws attention to the case of Aceh to analyse the mechanisms through which ideologically driven geographic imaginings obscured the role of place and class in colonial and anti-colonial violence in Indonesia. Its main perspective is the region's West Coast. In the course of the long and brutal Dutch-Acehnese war (1873–1942), the West Coast of Sumatra was transformed from a dynamic centre of trade, commerce, and religious renewal into a colonial frontier. Violent resistance persisted in this area as the Dutch involved themselves in and exacerbated local contestations for authority and resources. Colonial discourse worked to conceal these complexities, foregrounding an image of the West Coast as a remote, backwards, and inherently dangerous place, prone to a violent Muslim millenarianism.

scholarly journals Friend or foe? Potential for native biodiversity in West Coast farming

2002 ◽  
pp. 115-120
Author(s):  
C.C. Boswell ◽  
P.R. Espie ◽  
T. Maegli
Keyword(s):  
West Coast ◽  
Climate Model ◽  
Farming Systems ◽  
Sphagnum Moss ◽  
Climate Modelling ◽  
Private Ownership ◽  
The West ◽  
Indigenous Forest ◽  
Tree Production

The wet, warm West Coast climate favours tree production and pastures. Much of the land remains in indigenous forest under the control of Government agencies. In the more accessible parts of this land, and in land held under private ownership, we explore the feasibility of "farming" two examples of native biodiversity. Sphagnum moss production varies with location and differences in meso- and micro-climate. A climate model was used to predict where future sustainable sphagnum development may occur; i.e. within farming systems in the areas with the fastest growth rates. At its simplest and cheapest, this may involve flooding unimproved land and managing the moss. Another alternative could involve integration of moss production in the wet "hollow" of "hump and hollow" pasture systems. The West Coast retains several unique populations of kiwis and other indigenous birds. We advocate the future role of private enterprise (i.e. landholders) in protecting kiwi and, in the longer-term, the local communities profiting from ecotourism centred on them. Keywords: climate modelling, eco-tourism, kiwi, sphagnum moss

scholarly journals Peran Wilayah Negeri Larike pada Masa Kolonial

2016 ◽  
Vol 8 (2) ◽  
pp. 65
Author(s):  
Syahruddin Mansyur
Keyword(s):  
West Coast ◽  
Descriptive Analysis ◽  
Historical Context ◽  
Colonial Period ◽  
Historical Background ◽  
Analysis Method ◽  
Archaeological Remains ◽  
The West ◽  
Administrative Center

Sejak kehadiran bangsa Eropa Khususnya Belanda di Nusantara, berbagai upaya dilakukan untuk menguasai perdagangan termasuk di Kepulauan Maluku sebagai sumber utama produksi cengkih. Latar historis ini dapat diamati melalui sebaran tinggalan arkeologi masa Kolonial yang ada di wilayah ini, salah satunya adalah Negeri Larike yang berada di pesisir barat Jazirah Leihitu. Melalui metode analisis deskriptif dan analogi sejarah, tulisan ini dimaksudkan untuk mengidentifikasi sebaran tinggalan arkeologi yang ada di Negeri Larike, serta peran wilayah Negeri Larike dalam konteks historis masa Kolonial. Hasil penelitian mengungkap bahwa terdapat beberapa tinggalan arkeologi yang ada di wilayah ini. Ragam tinggalan tersebut sekaligus memberi gambaran peran wilayah sebagai salah satu wilayah pemusatan produksi cengkih dan pusat administrasi pemerintahan Belanda untuk wilayah Pesisir Barat Jazirah Leihitu. Since the presence of Europeans Especially the Dutch in the archipelago, various attempts were made to control the trade, including in the Maluku Islands as the main source of production of cloves. This historical background can be observed through the distribution of archaeological remains of the colonial period in this region, one of which is the Larike Village located in the west coast of Leihitu Peninsula. Through descriptive analysis method and historical analogies, this paper is intended to identify the distribution  of archaeological remains exist in Larike Village, as well as the role of the territory Larike Village in historical context Colonial period. Results of the study revealed that there are several archaeological remains exist in this region. The remains variety as well as describing the role of the region as one of the area concentration clove production and administrative center of the Dutch government for the territory of the West Coast Leihitu Peninsula.

scholarly journals Gubernur Jenderal VOC Jan Pieterszoon Coen dan Pembangun Kota Batavia (1619-1629)

Sosio e-kons ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 54
Author(s):  
Rani Noviyanti
Keyword(s):  
West Coast ◽  
North Coast ◽  
The West ◽  
The North ◽  
The Social ◽  
The City

<p>ABSTRACT</p><p>The establishment of the city of Batavia on the west coast of the north coast of Java, cannot be separated from the role of a figure named Jean Pieterzoon Coen. Although previously Jayakarta (the name before Batavia), was controlled and built by Pangeran Fatahillah, the situation and conditions in the social and economic fields of Jayakarta were not like the management of J.P. Coen. After Jayakarta was controlled by the VOC, through a military expedition policy designed by JP. Coen, the condition of the city of Jayakarta slowly gradually increased in the social and economic fields. The increase in the city of Batavia in the social and economic fields was based on three JP policies. Coen was quite brave, namely increasing trade activities in the Sunda port of Kalapa, revitalizing the position of the islands in northern Batavia as a base of administration and defense and security, and opening the widest door for Chinese traders and immigrants. The three policies, in fact, were purely based on the thoughts outlined by JP. Coen, after taking over the Jayakarta area from the mastery of Prince Fatahillah.</p><p>Keywords: J.P. Coen, Kota Batavia.</p><p><strong><em>ABSTRAK</em></strong></p><p>Pendirian kota Batavia di sebelah barat pesisir pantai utara Jawa, tidak dapat dipisahkan dari peran seorang tokoh yang bernama Jean Pieterzoon Coen. Meskipun sebelumnya Jayakarta (nama sebelum Batavia), dikuasai dan dibangun oleh Pangeran Fatahillah, akan tetapi situasi dan kondisi dalam bidang sosial dan ekonomi Jayakarta tidak seperti pada masa pengelolaan J.P. Coen. Setelah Jayakarta dikuasai oleh VOC, melalui kebijakan ekspedisi militer yang dirancang oleh JP. Coen, keadaan kota Jayakarta perlahan demi perlahan semakin meningkat dalam bidang sosial dan ekonomi. Peningkatan kota Batavia dalam lapangan sosial dan ekonomi dilatari oleh tiga kebijakan JP. Coen yang cukup berani, yakni meningkatkan aktivitas perdagangan di pelabuhan Sunda Kalapa, merevitalisasi kedudukan pulau-pulau di utara Batavia sebagai basis adiministrasi dan pertahanan dan keamanan, serta membuka pintu seluas-luasnya bagi pedagang dan pendatang etnis Tionghoa. Tiga kebijakan tersebut, sejatinya meurpakan murni hasil pemikiran yang dituangkan olh JP. Coen, setelah mengambil alih wilayah Jayakarta dari penguasaan pangeran Fatahillah.</p><p>Kata Kunci : J.P. Coen, Kota Batavia.</p>

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