The Nordic Seas carbon budget: Sources, sinks, and uncertainties

A carbon budget for the Nordic Seas is derived by combining recent inorganic carbon data from the CARINA database with relevant volume transports. Values of organic carbon in the Nordic Seas' water masses, the amount of carbon input from river runoff, and the removal through sediment burial are taken from the literature. The largest source of carbon to the Nordic Seas is the Atlantic Water that enters the area across the Greenland-Scotland Ridge; this is in particular true for the anthropogenic CO2. The dense overflows into the deep North Atlantic are the main sinks of carbon from the Nordic Seas. The budget show that presently 12.3 ± 1.4 Gt C yr−1 is transported into the Nordic Seas and that 12.5 ± 0.9 Gt C yr−1 is transported out, resulting in a net advective carbon transport out of the Nordic Seas of 0.17 ± 0.06 Gt C yr−1. Taking storage into account, this implies a net air-to-sea CO2 transfer of 0.19 ± 0.06 Gt C yr−1 into the Nordic Seas. The horizontal transport of carbon through the Nordic Seas is thus approximately two orders of magnitude larger than the CO2 uptake from the atmosphere. No difference in CO2 uptake was found between 2002 and the preindustrial period, but the net advective export of carbon from the Nordic Seas is smaller at present due to the accumulation of anthropogenic CO2

Skillful prediction of Barents Sea ice cover

A main concern of present climate change is the Arctic sea ice cover. In wintertime, its observed variability is largely carried by the Barents Sea. Here we propose and evaluate a simple quantitative and prognostic framework based on first principles and rooted in observations to predict the annual mean Barents Sea ice cover, which variance is carried by the winter ice (96%). By using observed ocean heat transport and sea ice area, the proposed framework appears skillful and explains 50% of the observed sea ice variance up to 2 years in advance. The qualitative prediction of increase versus decrease in ice cover is correct 88% of the time. Model imperfections can largely be diagnosed from simultaneous meridional winds. The framework and skill are supported by a 60 year simulation from a regional ice-ocean model. We particularly predict that the winter sea ice cover for 2016 will be slightly less than 2015

Lutte étagée ciblée et pulvérisation à très bas volume. Une protection insecticide du cotonnier moins onéreuse et plus respectueuse de l'environnement

La lutte étagée ciblée consiste à évaluer le niveau des populations de ravageurs la veille du traitement. Les insectes observés sont les chenilles des capsules ou des feuilles, les acariens, les aleurodes et les pucerons. Les niveaux de population sont confrontés à des seuils d'intervention et les résultats obtenus guident les choix des doses et des types d'insecticides utilisés. En 1995, 1 519 postes d'observateurs saisonniers ont été créés, pour une rémunération globale de 56 millions de francs CFA. Prévulgariséesur 407 ha en 1990, la lutte étagée ciblée a été vulgarisée sur 85 000 ha en 1995. Cette innovation nécessite la mise en oeuvre d'importants moyens dans le domaine de la formation et du suivi. La pulvérisation à très bas volume (TBV) épand 10 litres de bouillie aqueuse par hectare. Les insecticides utilisés sont des concentrés émulsionnables, moins chers que les insecticides pour ultra bas volume. A dose de matière active égale, un traitement TBV est 20 % moins cher qu'un traitement ULV. Les anciens appareils de traitement ultra bas volume ont été adaptés pour la pulvérisation TBV par un changement de buse et l'adjonction d'un réservoir auxiliaire. L'utilisation de la pulvérisation TBV a réduit les risques d'intoxication des opérateurs par inhalation (nuage de pulvérisation moins volatile) et par contact (bouillies insecticides aqueuses et moins concentrées). En permettant des économies de matières actives atteignant 30 à 40 %, la lutte étagée ciblée a permis de limiter les effets néfastes potentiels de la protection insecticide sur l'environnement. En 1992, la protection insecticide coûtait 9 005 francs CFA à l'hectare. En 1995, malgré la dévaluation, elle a coûté 10 700 francs CFA à l'hectare. En francs CFA constants, le coût de la protection insecticide a chuté de 41 % entre 1992 et 1995. Pour la campagne agricole 1995, l'économie réalisée a dépassé 900 millions de francs CFA

Skillful prediction of Barents Sea ice cover

A main concern of present climate change is the Arctic sea ice cover. In wintertime, its observed variability is largely carried by the Barents Sea. Here we propose and evaluate a simple quantitative and prognostic framework based on first principles and rooted in observations to predict the annual mean Barents Sea ice cover, which variance is carried by the winter ice (96%). By using observed ocean heat transport and sea ice area, the proposed framework appears skillful and explains 50% of the observed sea ice variance up to 2 years in advance. The qualitative prediction of increase versus decrease in ice cover is correct 88% of the time. Model imperfections can largely be diagnosed from simultaneous meridional winds. The framework and skill are supported by a 60 year simulation from a regional ice-ocean model. We particularly predict that the winter sea ice cover for 2016 will be slightly less than 2015

From the Dust Bowl to Frederick Manfred’s \u3cem\u3eThe Golden Bowl\u3c/em\u3e—A Journeyman’s Masterpiece

The time and place of Frederick Manfred’s birth—1912, on a farm in a corner of northwestern Iowa close to the South Dakota and Minnesota borders—gave him several perspectives on American life, resulting in the creation of several kinds of fiction. Manfred’s most celebrated novels, the five Buckskin Man tales, take place in the nineteenth century and have a wild west (mostly South Dakota) setting: they arose out of Manfred’s awareness of the dramatic and tumultuous events that had occurred near his home during the hundred years before his birth. But Manfred’s own childhood and youth in a settled agricultural community enabled him to depict, with a more somber palette, the subdued joys and struggles of twentieth-century midwestern farm life which he himself had directly experienced